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  1. #1
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    The Speedfreaks Grand Cherokee roll cage tech thread for drag racing

    pics are in route. notime, if you find the current nhra or other sanc bodies rules could you post them? or i'll look when i get back. i'm going to try and get as much tech as i can in here with as much help from y'all as i can get.
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    Member NoTime's Avatar
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    Here is a link to the NHRA 2012 Rulebook............ Over 300 pages

    http://www.bremertonraceway.com/2012_NHRA_RuleBook.pdf
    1998 ZJ 5.9 Platinum - 408 SC Sleeper ( 7.49 / 11.? )
    2012 RAM - Tow Vehicle
    2007 GC SRT8 Daily Driver
    2003 TJ Rubicon Inca Gold - Trail blaster
    1973 Trumph GT6 MK III
    20 Ft Enclosed Car Hauler

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    SECTION 4A -
    SUPER PRO, PRO, SPORTSMAN
    7.50 (*4.50) seconds & slower
    DESIGNATIONS
    NHRA SUMMIT RACING SERIES NATIONAL CHAMPIONSHIP
    SUPER PRO: 7.00 to 11.99
    PRO: 9.00 to 13.99
    SPORTSMAN: 12.00 to 19.99

    References in this section identify performance limits for various
    equipment and safety applications.
    Any vehicle except E.T. Motorcycle running faster than 135 mph
    must meet minimum requirements for 9.99-second vehicles
    including driver credentials and protective clothing. The 135-mph
    rule does not apply to E.T. Motorcycle. E.T. Motorcycle must comply
    with 9.99-second e.t. restrictions.

    REQUIREMENTS & SPECIFICATIONS
    ENGINE: 1
    ENGINE
    One internal-combustion automotive-type, motorcycle, or
    snowmobile engine permitted. Motorcycle or snowmobile-powered
    vehicles without reverse may not burn out across starting line.
    Harmonic balancer meeting SFI Spec 18.1 mandatory in any car
    running 10.99 (*6.99) or quicker. Maximum height of crankshaft
    centerline 36 inches for trucks running 12.00 and slower; 31 inches
    for trucks running 11.99 to 10.00; and 24 inches for trucks running
    9.99 seconds and quicker. See General Regulations 1:1.

    EXHAUST SYSTEM
    Competition exhaust permitted. Exhaust must be directed out of car
    to rear, away from driver and fuel tank. For cars running quicker
    than 7.50 (*4.50), see Advanced E.T. Requirements. See General
    Regulations 1:3.

    FUEL
    Racing gasoline, gasoline, alcohol, gasohol, diesel, ethanol, natural
    gas, and propane permitted. Nitromethane prohibited.

    FUEL SYSTEM
    All fuel-tank filler necks located inside trunk must have filler neck
    vented to outside of body. Vented caps prohibited. All batteries, fuel
    lines, fuel pumps, or filler necks located inside trunk require
    complete bulkhead of at least .024-inch steel or .032-inch aluminum
    to isolate driver compartment from trunk. Fuel lines must be located
    outside driver compartment. Fuel tanks must be within confines of
    the body. See General Regulations 1:5.

    INDUCTION
    Any induction permitted. Electronic fuel injection must be closed,
    OEM-type system; i.e., may monitor only engine functions.
    Monitoring of vehicle performance criteria, wheel speed, driveshaft
    speed, vehicle acceleration, etc. by fuel-injection system prohibited.
    All aftermarket OEM-type electronic fuel injection must be NHRAaccepted.
    A current list of NHRA-accepted electronic-fuel-injection
    systems is available on NHRARacer.com. Open-loop systems
    permitted on production vehicles as equipped with OEM electronic
    fuel injection. See General Regulations 9:1.

    LIQUID OVERFLOW
    Catch-can mandatory for coolant overflow; one-pint (16-ounce)
    minimum capacity. See General Regulations 1:7.

    NITROUS OXIDE
    Commercially available nitrous oxide permitted, including
    supercharged and turbocharged engines. Nitrous bottle(s) in driver
    compartment must be equipped with a relief valve and vented
    outside of driver’s compartment. Bottle(s) must be stamped with a
    DOT-1800 pound rating and permanently mounted (no hose clamps
    or tie wraps). Hoses from bottle(s) to solenoid must be highpressure
    steel-braided or NHRA-accepted hoses. Commercially
    available, thermostatically controlled, blanket-type warmer
    accepted. Any other external heating of bottle prohibited. See
    General Regulations 1:6.

    OIL-RETENTION DEVICE
    All vehicles permitted to utilize an NHRA-accepted lower engine oilretention
    device. See General Regulations 1:8.

    SUPERCHARGER, TURBOCHARGER
    Permitted on gasoline, racing-gasoline, and alcohol-burning cars.
    Supercharger restraint system meeting SFI Spec 14.1 mandatory
    on Roots-type supercharger when alcohol is used as fuel. Highhelix,
    centrifugal and screw-type supercharger permitted. Screwtype
    supercharger, manifold burst panel meeting SFI Spec 23.1 (in
    addition to panel in supercharger) plus restraint system meeting
    SFI Spec 14.21 mandatory. Supercharger drive must be belt,
    NHRA-accepted chain driver or NHRA-accepted gear drive.
    Supercharger restraint straps must be covered with a fire-resistant
    material. The blower restraint straps and fuel lines must be installed
    such that when the restraint straps are fully extended, no load is
    placed on any of the fuel lines. Air-to-air or water-to-air intercoolers
    permitted on turbocharged and centrifugal supercharged vehicles.
    See General Regulations 1:10.

    VALVE COVERS
    Cast or fabricated metal valve covers, using all attachment bolt
    holes, mandatory on supercharged, methanol-burning cars.

    DRIVETRAIN: 2
    CLUTCH, FLYWHEEL, FLYWHEEL SHIELD
    Flywheel and clutch meeting SFI Spec 1.1 or 1.2 (two-disc
    maximum) mandatory on any car running 11.49 (*7.35) or quicker.
    Flywheel shield meeting SFI Spec 6.1, 6.2, 6.3, or 9.1 mandatory
    on all cars running 11.49 (*7.35) or quicker. Cars with rotary
    engines running 11.49 (*7.35) or quicker must be equipped with a
    flywheel shield made of 1/4-inch-minimum-thickness steel plate
    surrounding the bellhousing 360 degrees. See General Regulations
    2:3, 2:5, 2:6, 2:10.

    DRIVELINE
    OEM production line all-wheel-drive vehicles permitted. Driveshaft
    loop required on all cars running 13.99 (*8.59) or quicker and
    utilizing slicks, except vehicles running 11.49 (*7.35) seconds or
    slower equipped with street tires. See General Regulations 2:4.

    REAR END
    Aftermarket axles and axle-retention device mandatory on any car
    running 10.99 (*6.99) or quicker or any car with locked differential.
    Cars running 10.99 (*6.99) or quicker that weigh more than 2,000
    pounds with independent rear suspension without upper and lower
    (both) control arms must replace swing axle differential with
    conventional differential housing assembly. (Example: 1963-1982
    Corvette). Cars with independent rear suspension using upper and
    lower (both) control arms may retain swing axle assembly
    regardless of weight or e.t. Must have 360-degree, minimum
    1-inch-wide by 1/4-inch-thick axle retention loop on each axle. See
    General Regulations 2:11.

    TRANSMISSION, Aftermarket Planetary
    Transmission shield meeting SFI Spec 4.1 mandatory on any
    supercharged or turbocharged vehicle, or any vehicle burning
    methanol or nitrous oxide, running 9.99 seconds or quicker and
    Super Pro, Pro, Sportsman Section 4A, page 3equipped with
    aftermarket planetary transmission. See General
    Regulations 2:12, 2:13.
    Last edited by speedmontzj; 01-12-2013 at 04:55 PM.
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    TRANSMISSION, Automatic
    Spring-loaded, positive reverse lockout device and functional
    neutral safety switch mandatory. Transmission shield meeting SFI
    Spec 4.1 mandatory on any car running 10.99 (*6.99) or quicker or
    any car exceeding 135 mph. Automatic transmission flexplate
    meeting SFI Spec 29.1 and flexplate shield meeting SFI Spec 30.1
    mandatory on cars running 9.99 (*6.39) or quicker or any car
    exceeding 135 mph. See General Regulations 2:12, 2:14.

    BRAKES & SUSPENSION: 3
    BRAKES
    Four-wheel hydraulic brakes mandatory on any bodied car running
    7.99 (*4.99) or quicker. Minimum two rear-wheel (one caliper per
    wheel) hydraulic brakes mandatory on dragsters, Funny Cars, and
    any car running slower than 8.00 (*5.00) seconds. Dragsters
    running slower than 10.99 (*6.99) with a total car weight of 1,000
    pounds or less and a one-piece rear axle may use a single brake
    rotor with dual calipers. See General Regulations 3:1.

    STEERING
    See General Regulations 3:3, 4:1.
    SUSPENSION, Altereds, Dragsters
    Full automotive-type front suspension mandatory. Rigid mounted
    rear axles permitted. Minimum one hydraulic shock absorber per
    sprung wheel. Suspension optional on cars weighing 2,350 pounds
    or less with 100-inch or longer wheelbase. See General
    Regulations 3:2, 3:4, 3:5.

    SUSPENSION, Stock-Bodied Cars
    Full automotive-type suspension mandatory. Minimum one
    operating hydraulic shock absorber per wheel. Lightening of stock
    components prohibited. Rigid mounted suspensions prohibited. See
    General Regulations 3:2, 3:4, 3:5.

    WHEELIE BARS
    Permitted. Wheels must be nonmetallic. See General Regulations
    3:6.

    FRAME: 4
    BALLAST
    Permitted. See General Regulations 4:2.

    DEFLECTOR PLATE
    Mandatory on rear-engine dragsters. See General Regulations 4:3.

    GROUND CLEARANCE
    Minimum 3 inches from front of car to 12 inches behind centerline
    of front axle, 2 inches for remainder of car, except oil pan and
    headers. See General Regulations 4:5.

    PARACHUTE
    Mandatory on any car that runs 150 mph or faster. See General
    Regulations 4:8.

    ROLL BAR
    Roll bar mandatory in all cars (including T-tops) running 11.00
    (*7.00) to 11.49 (*7.35), in convertibles running 11.00 (*7.00) to
    13.49 (*8.25), and in all dune-buggy-type vehicles running 12.00
    (*7.50) seconds and slower. Permitted in all cars. See General
    Regulations 4:10, 10:6.

    ROLL CAGE
    Roll cage mandatory in cars running 10.99 (*6.99) or quicker or any
    car exceeding 135 mph. In full-bodied cars, with unaltered firewall,
    floor, and body (from firewall rearward, wheeltubs permitted),
    running between 10.00 (*6.40) and 10.99 (*6.99), roll bar permitted
    in place of roll cage. In convertibles running 10.99 or quicker or
    exceeding 135 mph, roll cage mandatory. Cars running between
    7.50 (*4.50) and 9.99 (*6.39) must have chassis recertified every
    three years by NHRA and have a serialized sticker affixed to cage
    before participation. Plating of chassis prohibited for all cars
    manufactured after Jan. 1, 2003. Rear-engine dragsters must
    conform to SFI Spec 2.7B; vehicles running 8.49 (*5.35) to 7.50
    (*4.50) and/or exceeding 180 mph must meet appropriate SFI Spec
    for body used. Effective Jan. 1, 2007, all new Street Roadsters must
    conform to SFI Spec 10.4. Existing Street Roadsters must meet SFI
    Spec 10.4 at their next scheduled recertification effective Jan. 1,
    2008. No existing cars will be recertified early to delay compliance.
    All others must conform to specs for body style used, as listed in
    General Regulations 4:11, 10:6.

    ROLL-CAGE PADDING
    Roll-cage padding meeting SFI Spec 45.1 mandatory on any
    vehicle running 9.99 (*6.39) and quicker. Padding must be used
    anywhere driver’s helmet may come in contact with roll-cage
    components. See General Regulations 4:11, 10:6.


    WHEELBASE
    Minimum 85 inches, unless OEM was less and vehicle is equipped
    with OEM engine and drivetrain. Maximum wheelbase variation
    from left to right: 1 inch. Dragsters: 2 inches. Minimum front tread
    width: 26 inches on any dragster.

    TIRES & WHEELS: 5
    TIRES
    Racing slicks permitted. Minimum diameter of 13 inches on front
    tires of any dragster.

    WHEELS
    Must be automotive-type wheels suitable for street use. Minimum
    wheel size: 13 inches (unless originally equipped with smaller
    wheels and vehicle is equipped with original engine). The thread
    engagement on all wheel studs to the lug nut, or lug bolt to wheel
    hubs, must be equivalent to or greater than the diameter of the
    stud. Length of the stud/bolt does not determine permissibility;
    length of the engagement between the stud and lug determines
    permissibility. Automotive-type wire wheels or motorcycle wheels
    permitted on front axle only of dragsters weighing 1,800 pounds or
    less. See General Regulations 5:2.

    INTERIOR: 6
    SEATS
    Properly braced, framed, and supported seats constructed of
    aluminum, fiberglass, carbon fiber, or double-layer poly (automotive
    accessory seats) permitted. See General Regulations 6:2.

    SHEET METAL
    Driver-compartment interior must be aluminum, steel, NHRAaccepted
    carbon fiber, or fiberglass. Magnesium prohibited.

    UPHOLSTERY
    Optional. See General Regulations 6:2.

    WINDOW NET
    Window net meeting SFI 27.1 mandatory in any full-bodied car
    required by the rules to have a roll cage. See General Regulations
    6:3.

    BODY: 7
    AIRFOIL
    Altereds, dragsters: A positive-locking device mandatory on all
    airfoils. Side-mount canard-type wings permitted. No part of wing
    may be within 6 inches of a tire. Front overhang may not project
    more than 30 inches forward of front spindle.
    Last edited by speedmontzj; 01-12-2013 at 05:02 PM.
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  5. #5
    Member NoTime's Avatar
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    Ya I read all that.... the other thing we have problem with and I shall ask Martin S. is about the "Transmission shield meeting SFI
    Spec 4.1 mandatory on any car running 10.99 (*6.99) or quicker or
    any car exceeding 135 mph." and similar for the flex plate.

    Or I just leave it all and just run 11.50 until the last run and get kicked out LOL
    1998 ZJ 5.9 Platinum - 408 SC Sleeper ( 7.49 / 11.? )
    2012 RAM - Tow Vehicle
    2007 GC SRT8 Daily Driver
    2003 TJ Rubicon Inca Gold - Trail blaster
    1973 Trumph GT6 MK III
    20 Ft Enclosed Car Hauler

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    Quote Originally Posted by NoTime View Post
    Ya I read all that....

    well i figured you might have. i was more posting it for everyone just wondering that didn't want to read all 300+ pages looking for that.


    Or I just leave it all and just run 11.50 until the last run and get kicked out LOL
    ya it seems i'm screwed in several different ways. i may have to run 11.50 at 5lbs of boost. then make my glory run at 20lbs to 9.95 and get kicked out. damn i hope it is that easy.


    looks like i will have to build a box or atleast vent it outside. would the back of a grand be considered a trunk? the highlighted part also screws me. i would have to change out the cell to have the pickups at the bottom.

    FUEL SYSTEM
    All fuel-tank filler necks located inside trunk must have filler neck
    vented to outside of body. Vented caps prohibited. All batteries, fuel
    lines, fuel pumps, or filler necks located inside trunk require
    complete bulkhead of at least .024-inch steel or .032-inch aluminum
    to isolate driver compartment from trunk. Fu el lines must be located
    outside driver compartment.
    Fuel tanks must be within confines of
    the body. See General Regulations 1:5.



    also this:

    DRIVELINE
    OEM production line all-wheel-drive vehicles permitted. Driveshaft
    loop required on all cars running 13.99 (*8.59) or quicker and
    utilizing slicks,
    except vehicles running 11.49 (*7.35) seconds or
    slower equipped with street tires.


    that to me looks like you only have to run dshaft loops if you are running slicks. drag radials are not considered slicks are they?
    Last edited by speedmontzj; 01-13-2013 at 08:38 AM.
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  7. #7
    Forum CONDUCTOR Man Z88Z's Avatar
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    Quote Originally Posted by NoTime View Post
    Ya I read all that.... the other thing we have problem with and I shall ask Martin S. is about the "Transmission shield meeting SFI
    Spec 4.1 mandatory on any car running 10.99 (*6.99) or quicker or
    any car exceeding 135 mph." and similar for the flex plate....
    Wouldn't a blow blanket suffice?

    I've mentioned that about the flexplates before. So far I haven't see one made for our motors that has any kind of window wheel.

    That would require some fabbing maybe, or going to FAST for people that don't have to pass emissions


    Quote Originally Posted by speedmontzj View Post
    .....looks like i will have to build a box or atleast vent it outside. would the back of a grand be considered a trunk? the highlighted part also screws me. i would have to change out the cell to have the pickups at the bottom.

    FUEL SYSTEM
    All fuel-tank filler necks located inside trunk must have filler neck
    vented to outside of body. Vented caps prohibited. All batteries, fuel
    lines, fuel pumps, or filler necks located inside trunk require
    complete bulkhead of at least .024-inch steel or .032-inch aluminum
    to isolate driver compartment from trunk. Fu el lines must be located
    outside driver compartment.
    Fuel tanks must be within confines of
    the body. See General Regulations 1:5.



    also this:

    DRIVELINE
    OEM production line all-wheel-drive vehicles permitted. Driveshaft
    loop required on all cars running 13.99 (*8.59) or quicker and
    utilizing slicks,
    except vehicles running 11.49 (*7.35) seconds or
    slower equipped with street tires.


    that to me looks like you only have to run dshaft loops if you are running slicks. drag radials are not considered slicks are they?
    I mentioned that too about his fuel cell, wondering what kind of tech inspection it would pass.

    I'm thinking you could just build a box over it. right? Big enough to cover the battery too I assume.

    I wouldn't be particularly comfortable running a setup like it has now, probably even less so on the street.
    Originally I was planning on running some kind of box setup on the lightweight. Use wheeltubs and box it in from the tubs back along the body under the windows, then open it up somewhere along the floor or whatever so it was semi-open but to the ground rather than the pass compartment.

    It's interesting they mention that after AWD vehicles, and it says 'loop' as in singular - but I assume they meant 'loops' plural - or maybe they were thinking AWD stuff like Soobies that only have a rear dshaft?
    I would have thought yours would already have a dshaft loop on the rear. Front wouldn't be hard to do but it would be a little "interesting" to fab up.

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    well the battery is already in a box. i know marrty was running low 11's in it and not getting kicked out. although he may have known someone that let it slide.

    never really worried about the cell. i have never smelled gas inside even after sitting closed up for a couple weeks. that cell is also contained inside a metal box. like the high dollar jaz cells that some of the asphalt circle track guys use. so that may be the reason for it being sealed so well. it also has a lot of foam inside so the gas doesnt move around a lot.

    no loop on the rear shaft. it just has had a aluminum rear shaft installed. front dshaft is stock. the stock front axle shafts have been swapped out for chromo units. i'm not 2 worried about a front dshaft loop because hopefully it will not have one. although if it gets converted to a stick it will have to/really need a loop on the rear. Just think guys. anyone trying to get in the 10's or even 11's. the stock shafts were never designed to hold that kind of stress. i would think about swapping to aftermarket shafts if that kind of speed is your goal.

    so drag radials aren't considered slicks are they? course if i'm just t-n-t''n slicks would help if traction becomes a problem. don't think it will if it comes out of the hole soft and ramp the boost quick. just let it pull like a freight train on the big end.
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  9. #9
    XJ whiz POLAR_JEEP_04's Avatar
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    I just bought DOM and HREW to build a hybrid cage. It will be in my build thread once everything starts coming together.
    Z88Z. .512/.512 110lsa cam, 1.65 roller rockers, EQ Monster Magnum heads, AirGap, 52mm TB, 24lbs injectors, aluminum fuel rails, mopar headers, K&N, Kolak ignition, SCT tuned. firepunk built 46RE with MSaine VB and converter. 44/8.8" 4.56 gears and locked with RCVs and Yukon super 88. PAC racing jeepspeed coils. caged. 35" MT/Rs

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    ok notime, i'm getting you some pics but until i post the detailed pics i will throw these up to hold you off till i get the others.

    from the rear. of batt box .






    driver side looking in.



    driver looking back







    i hope to be changng a few things when it comes back out. like race seats with a harness. new door bars so you can actually get in the damn thing. i might even change the rear down bars. changing them would make it easier to close off the cell if that is required. the whole thing might end up getting rebuilt,, then again i might not change it at all.lol
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    Forum CONDUCTOR Man Z88Z's Avatar
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    I just love seeing the booster seat and a roll cage.

    So much win right there

    I'm guessing you warned him about not playing with the extinguisher already, LOL

    Also - what's up with that steering wheel?

    Is that and add-on cover or has it been professionally recovered or what? Looks pretty good.

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    Its just a slip on cover deal. i dont like the feel of it because its to fat. i like aftermarket wheels because of the small dia. i plan to install a quick release steering wheel one way or another if the cage gets a upgrade because of a faster et.

    honestly though, its right at the limit for et and stock looks without somekind of crazy highdollar powerplant. it could be gutted of interior like carpet, door panels, etc and gain .50 + et. if i get it down to 10.20-10.30's and want 9's that shit is coming out, along with someother stuff to get them times and weight down.

    i think stripped down, with a serious smallblock N/A deal you could get mid 9's out of it. I bet 8's would be possible with a couple turbos on a good motor
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    Member NoTime's Avatar
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    I run 4 M&H Drag radials on extra set of stock rims........ ( I like the sleeper look ) and they are DOT approved so I guess that is street. But when I get down to below 11.5 that's when you need more safety stuff.

    Thanks for the shots of the cage,,, and my battery will be back there too with a disconnect on rear bumper.

    Got the same shifter to still go in this winter. No NOS yet but my all forged motor would take it ok.

    Other thing I need is how they tied the cage into the unibody ( is it two plates sandwidged at base of each upright )

    Tim
    1998 ZJ 5.9 Platinum - 408 SC Sleeper ( 7.49 / 11.? )
    2012 RAM - Tow Vehicle
    2007 GC SRT8 Daily Driver
    2003 TJ Rubicon Inca Gold - Trail blaster
    1973 Trumph GT6 MK III
    20 Ft Enclosed Car Hauler

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    XJ whiz POLAR_JEEP_04's Avatar
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    No a pillar bars?
    Z88Z. .512/.512 110lsa cam, 1.65 roller rockers, EQ Monster Magnum heads, AirGap, 52mm TB, 24lbs injectors, aluminum fuel rails, mopar headers, K&N, Kolak ignition, SCT tuned. firepunk built 46RE with MSaine VB and converter. 44/8.8" 4.56 gears and locked with RCVs and Yukon super 88. PAC racing jeepspeed coils. caged. 35" MT/Rs

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    Forum CONDUCTOR Man Z88Z's Avatar
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    Quote Originally Posted by POLAR_JEEP_04 View Post
    No a pillar bars?
    I've looked into that a bit and doing A pillar bars on a ZJ would be an absolute stone bitch!

    You'd have to butcher the dash frame - which is the least of your worries...

    The bars would need to run right down through where the bottom mounting points for the dash are, so they'd have to be installed with the dash in place - which I'm not even sure is possible, or you could possibly fabricate some custom mounting points on the dashframe and bars so the dashframe bolts to the pillar bar instead...
    Then you've got the junction box on the passenger side to contend with and there's not a whole lot you can do with that - unless you want to move it to the back seat but what kind of a person would do that? - plus I can't remember exactly but I think the heater box is in the way too.

    Really not a lot of good alternatives. You can't really run them in front of the dash cuz you'd have to be a contortionist to get into the damn thing. I honestly never noticed how far into the passenger compartment the dash protrudes until I started looking into the cage thing, in fact.
    You could maybe run them around the front facia and curved in towards the firewall which would allow a little more leg entrance, but then the dash would be trapped in there.

    If you had a totally stripped out Jeep, no heater box or anything else in the dash and a relocated Junction Box, it would be easier - but that's what I got on my lightweight and it still looks like it'd be a bitch.


    If anyone's really interested in the A pillar bar subject I have a bunch of pics of that area in various stages of disassembly down to a bare firewall.

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    Quote Originally Posted by POLAR_JEEP_04 View Post
    No a pillar bars?
    got to remember this is a street rig, no t a crawler. do some looking.most real fast "street" cars that stay on the street, dont run 8pt cages till in the 8's . even nhra doesnt require it till 8.99 or 9.50's and below i think. how many zjs do you know in the mid 9's.? I would not worry about rolling in a street ride or my ride until i could start running a mid 9 second dial in easy. over kill before that to me.

    also have to remember for nhra spec you cant use a regular "offroad" type cage anyway. most are done where the a pilliar bar comes up and back beside the drivers head and connects to the b pilliar. that is not legal. you have to run a halo setup for nhra. halo bar connects to b pilliar runs around windshield and back around to b pilliar again. then the a pilliar down bar attaches at the bend in the halo. thay is the only legal way to run an 8pt and up cage.

    a pilliar bars are great if your rolling in rocks or up and down hills where you need the roof support in a roll. the only time you would see that kind of force at the strip is to get upside down and into the wall hard. not many 10.0's 125-135mph cars doing that. i wouldnt start thinking about that till i was in the 150+mph in a 1/4 . usually when you get to that point, is when the interior comes out for alum door skins, alum or fiberglass dash, tubs, full sheet interior kinda thing. if you rip the dash out to do the a pilliars, then it looks funny with an alum dash and everything else stock. so might as well gut it at that poiint.

    there is always tha freak crash and it never hurts to be on the safe side but i'm not adding 100+lbs just to be sae. hell it aint been that long since i was running from 2 state trooper cars and a county car on a 2lane hwy at 170+mph. so i say fawk that a piliar bar. lol jfwy

    you will be amazed at what you will do when the blue lights are flashing. some stop and some put the hammer down and say ftp. hell i had to drive my jeep for damn near a month after that to work because there was troopers all over that stretch of hwy.
    Last edited by speedmontzj; 01-22-2013 at 04:32 PM.
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  17. #17
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    To do one that fit and keep the interior "stock" like dash and door panels you would need to do something like they have for tj's with the flat plate but i think its a wste of tme for very little support. i think i would try maybe bending it out toward the door an making the room there instead of the dash. either way you go it will require some big time fabing in both tube and sheet metal or alum.

    yeas to answer a question from earlier, i'm going to get some pics of how my bars attach to the body. i'm kinda scared to look cause i figure thatfawking cage will have to be cut out 2.
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    ok did a little more looking . seems 11.50 is the break as no time said.


    With street tires or drag radials, no loop is required until 11.49 1/4-mile (7.35 1/8-mile) and faster

    11.49 1/4-mile (7.35 1/8-mile) or quicker:

    -A 5-point minimum roll bar on a fixed roof car (t-tops okay as well if in place while racing) from 11.49 to 11.00 (7.00 1/8-mile). If the hardtop / t-top car has un-altered floors, firewall and frame rails (wheel tubs are okay), then the 5-point roll bar is good til 10.00 1/4 mile (6.40 1/8-mile). Convertibles require the 5-point bar from 13.49 (8.25 1/8-mile to 11.00 (7.00 1/8-mile).
    The rollbar must be constructed of a minimum o.d. mild steel or chrome moly tubing (moly can be a smaller o.d and is lighter but more expensive), see diagram below for specs.
    The roll bar can be bolted or welded to the floor, see diagram below for specs.
    Roll bar must be padded anywhere the driver's helmet may contact it while in the driving position, see diagram below for specs.
    The 5-points are:
    Main hoop; 2 "down bars" (bars that go from the main hoop rearward to the trunk floor/hatch area. These can be straight or bent like a "package tray" style, search for photos); Welded crossbar for belts (can't be removable), see rulebook for exact location. Driver side door bar (can be a swing-out. Many put a passenger's side bar in as well (6-point) because it strengthens the car on both sides, but if you have subframe connectors the difference may be minimal).

    -Protective Clothing (SFI jacket with a 3.2A/1 rating, no expiration date)

    -5 point harness (up to date, they must be replaced or re-certified every 2 years; You can re-cert by shipping the belts to the manufacturer, or buy new ones. I usually buy new ones and sell the old ones on EBay (street racers and dune buggies buy 'em).

    -SFI-approved flywheel and/or clutch (no expiration date)

    -Screw-in valve stems

    -No tint allowed on window except factory


    will grab the rest when i get back. in short at 9.99 and faster or over 135.00mph it has to have a 10 pt cage. cage has to be recert every 3 years . driver also has to have a nhra comp license. sounds like if mine ever gets that fast i will get tossed.
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  19. #19
    King Dumbass McCloudsZJ's Avatar
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    Just out of curiosity, if the roll cage doesn't need to be welded in (it says it doesn't for sub 11.5) would one of the cages from Rock Hard work?

    http://www.rockhard4x4.com/product_p/rh-1031.htm




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    well i dont know. i think it only has to be welded for 9.99 and below. you would have to weld in a harness bar behind the front seats to bolt the harnesses too. says it cant be removable. you would also need atleast a drivers doorbar. i would run a doorbar on each side to to make it "even " on both sides and also for the support on both sides. says it can be swingaway but the nountswould have to be welded i think. i dont know about the rear bars either. i think they have to come down to the "trunk area/hatch". they can be straight or bent to fit better. i think you may need the 2 angled bars off the b piliar that goes to the floor. all the nhra example ddrawing i have seen have those.


    it would be easy to add that stuff but it would make the "bolt in" part not so bolt in anymore. also if you decided to ever stepup to try for 9's you would have to toss it and starover pretty much. i think that cage is close to 1000 dollars by the time you get it shiipped. i bet you could find someone to build you one for that thats a "street" cage.
    Last edited by speedmontzj; 01-24-2013 at 05:33 PM.
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  21. #21
    XJ whiz POLAR_JEEP_04's Avatar
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    ImageUploadedByTapatalk1359129447.419715.jpg
    My ZJ will have a cage soon
    Z88Z. .512/.512 110lsa cam, 1.65 roller rockers, EQ Monster Magnum heads, AirGap, 52mm TB, 24lbs injectors, aluminum fuel rails, mopar headers, K&N, Kolak ignition, SCT tuned. firepunk built 46RE with MSaine VB and converter. 44/8.8" 4.56 gears and locked with RCVs and Yukon super 88. PAC racing jeepspeed coils. caged. 35" MT/Rs

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    Alright. you are going to take a bunch of pics and post a thread right? is it for an offroad jeep or a street jeep? sorry if i missed a build . post a link to direct me in the right direction.
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  23. #23
    XJ whiz POLAR_JEEP_04's Avatar
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    Project go fast and jump high. It will be an Offroad niner that will also be a street sleeper. 408 with heads, intake, cam... And a built 46re.

    Right now I'm just gathering parts and planning but yes there will be pics and a build thread.
    Z88Z. .512/.512 110lsa cam, 1.65 roller rockers, EQ Monster Magnum heads, AirGap, 52mm TB, 24lbs injectors, aluminum fuel rails, mopar headers, K&N, Kolak ignition, SCT tuned. firepunk built 46RE with MSaine VB and converter. 44/8.8" 4.56 gears and locked with RCVs and Yukon super 88. PAC racing jeepspeed coils. caged. 35" MT/Rs

  24. #24
    Forum CONDUCTOR Man Z88Z's Avatar
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    Quote Originally Posted by McCloudsZJ View Post
    Just out of curiosity, if the roll cage doesn't need to be welded in (it says it doesn't for sub 11.5) would one of the cages from Rock Hard work?

    http://www.rockhard4x4.com/product_p/rh-1031.htm
    Well, that is pretty awesome!

    I was figuring there was some kind of "where there's the will, there's a way" type of solution for the dash area but the flattened bars around the dash thing is freakin amazing!

    However - as far as whether that flattened section would pass NHRA tech, that might be a different story. No idea.

    But it seems like it might be a good basis to start with. Looks like door bars could be added and the harness support, and maybe welding it together at the joints plus maybe flanges could be added for welding to the frame? - although at some point it might just be easier to fab the thing.

    I wonder what the weight is on that?


    Although, if we're trying to get to the speeds where this stuff is necessary you could maybe go a step further and back-half the thing with a set of bars like speedmont has tied into the frame rails. Allow for wheel tubs and the rails from some place like competitionengineering which would allow for four link and a better traction setup, especially if we're considering a dedicated 2WD build

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    another pic of the cage






    i knew when someone asked about the plates on the floor i was scared of what i would find. well damnit i should have known what i would find. goes along perfectly with everything else on this piece of shit i bought. Saleen, i blame you for not trying harder to stop me. lol i will say you were right.
















    looks like i will be stripping the interior to grind that bird shit out of there and reweld everything.
    Last edited by speedmontzj; 02-07-2013 at 07:23 AM.
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