Page 1 of 2 1 2 LastLast
Results 1 to 15 of 21
  1. #1

    do i really need front jounce bumpers and/or boots?

    when i installed the Intrax lowering springs in my Cutlass, i also installed KYB jounce bumpers/boots (they are one integrated piece). well it turns out that the Intrax springs provided so much drop, that the car actually sat on the jounce bumpers. this of course made the front end completely stiff as the car was right on the jounce bumpers. i had my brother raise the car with a hydraulic jack and slowly lower it while i looked at the jounce bumper. sure enough, the jounce bumper contacted the top of the strut before the car was even off the jack! since the KYB jounce bumper and boot is an integrated piece i can't simply cut it in half because then the boot would be gone. today i took the front strut/knuckle assemblies back out of the car and removed the KYB jounce bumper/boots completely, then put the strut assemblies back in the car. i wanted to see how much suspension travel their actually was. the front end of the car is probably close to an inch lower now (ALOT lower than my old Eibach springs), and i can actually bounce the car unlike before.

    do i really need to put jounce bumpers back in, or boots for that matter? i would have to get the Monroe brand strut boots and jounce bumpers since they are separate pieces and i can easily cut the jounce bumper in half and still install the boot. my rear struts have no boots (coilovers) and the struts still lasted for a long time. i'm just wondering if i really need the strut boots/jounce bumpers up front or if i can do without them. the Intrax springs are really stiff and i can't see the suspension compressing that much anyway. besides, i drive the car carefully and it is no longer my daily driver anyway. also, a jounce bumper would take away more suspension travel....

    anyone here with lowering springs running without jounce bumpers or boots? if not what do you use?

    thanks
    <br /><br />2000 Audi A6 Quattro - 2.7T/6-speed<br />1998 Buick Regal GS - L67/4T65E-HD

  2. #2
    Community Manager White93z34's Avatar
    Join Date
    Jan 2004
    Location
    Pittsburgh, PA
    Posts
    10,977
    Thanks
    90
    Thanked 1,654 Times in 909 Posts

    Re: do i really need front jounce bumpers and/or boots?

    consider finding a stock set of boots and jounce bumpers and cut them in half?
    -Chris D. - Your Community Manager

    1992 Chevrolet Lumina Z34 3.4L TDC v6 Getrag 284
    1990 Pontiac Turbo Grand Prix 3.1L v6 Hydramatic 4T60
    1997 Pontiac Bonneville SSE Supercharged 3.8L v6, Hydramatic 4T60E
    1987 Chevrolet Camaro Z28/IROC-Z 5.0L v8, Hydramatic 700R4

  3. #3
    Lurker
    Join Date
    Nov 2005
    Posts
    648
    Thanks
    0
    Thanked 1 Time in 1 Post

    Re: do i really need front jounce bumpers and/or boots?

    How could you be the first person to find this out? I have Intrax springs sitting here that will go on my project car as soon as everything is ready, and I planned on using a KYB setup as well. Tons of people use KYB's, and I'm sure they use em with the Intrax... sitting on the bumpers is sort of a big deal. Seems like they would break.

    You sure there isn't something unique about your setup? Surely they wouldn't design springs that lowered the car enough to sit on the bumpers.
    http://www.spudfiles.com
    Blast vegetables and whatever else you can think of! :laugh:

    1996 3500GP Coupe, "Bright White"
    3500 swap, 60degreeV6 1393 Grind Cam, Ported Intakes, Comp Cams Valve Springs, 65mm TB, Custom Pushrods, S&S Headers, 97 PCM with DHP Powrtuner, 2.5"; back to dual Hooker Aerochambers, SS Brake Lines, Addco Swaybar, KYB's, Intrax Springs, STB's, etc!

  4. #4
    Community Manager White93z34's Avatar
    Join Date
    Jan 2004
    Location
    Pittsburgh, PA
    Posts
    10,977
    Thanks
    90
    Thanked 1,654 Times in 909 Posts

    Re: do i really need front jounce bumpers and/or boots?

    i gather his issue is using the KYB boots/jounce bumper, they are integrated into the same thing, making it imposable to modify the jounce bumper for the drop.

    -Chris D. - Your Community Manager

    1992 Chevrolet Lumina Z34 3.4L TDC v6 Getrag 284
    1990 Pontiac Turbo Grand Prix 3.1L v6 Hydramatic 4T60
    1997 Pontiac Bonneville SSE Supercharged 3.8L v6, Hydramatic 4T60E
    1987 Chevrolet Camaro Z28/IROC-Z 5.0L v8, Hydramatic 700R4

  5. #5

    Re: do i really need front jounce bumpers and/or boots?

    it's not the KYB GR-2 struts that are the problem, it is the KYB jounce bumper/boots. they are just too tall for the Intrax springs. maybe everyone else is just using stock jounce bumpers? anyway, the KYB jounce bumper/boots definately do not work with Intrax springs.
    <br /><br />2000 Audi A6 Quattro - 2.7T/6-speed<br />1998 Buick Regal GS - L67/4T65E-HD

  6. #6

    Re: do i really need front jounce bumpers and/or boots?

    Quote Originally Posted by White93z34
    i gather his issue is using the KYB boots/jounce bumper, they are integrated into the same thing, making it imposable to modify the jounce bumper for the drop.

    yup. they are just too tall.

    i already threw my original (GM) jounce bumpers away dangit. i used those with the 1.5" Eibach springs and they were fine, i didn't even modify them. i would try using some stock jounce bumpers, but it would be such a PITA to pull them from a j/y car that i might as well buy new Monroe pieces.....if i need them.
    <br /><br />2000 Audi A6 Quattro - 2.7T/6-speed<br />1998 Buick Regal GS - L67/4T65E-HD

  7. #7
    19Cutlass94's Avatar
    Join Date
    Apr 2005
    Location
    Texas
    Posts
    10,522
    Thanks
    51
    Thanked 575 Times in 347 Posts

    Re: do i really need front jounce bumpers and/or boots?

    I wouldnt run without them, but thats just me. I had to cut mine twice before I stopped bottoming out the front end. Ive only got about 1" of jounce bumper. Really I think any jounce bumper will work, as long as you can cut it...
    Jay

    1994 Oldsmobile Cultass Supreme SL
    3400/Getrag 284 5spd
    1995 Chevy K1500 350c.i. 5spd Z71
    350/NV3500 5spd
    2014 Chevrolet Malibu LS
    Stock - Daily Driver

  8. #8

    Re: do i really need front jounce bumpers and/or boots?

    Josh....I will have a set out of my 88 cutlass....would you be interested in them? $10 + shipping just cuz it's work for me to pull them.
    Kyle
    1988 Cutlass Supreme, White/Black Leather,L67 Swap in progress 95,000 miles.

  9. #9

    Re: do i really need front jounce bumpers and/or boots?

    that's ok, i think i'll probably just buy some new ones. i went and looked at the Monroe pieces and i'm sure i can get them to work.
    <br /><br />2000 Audi A6 Quattro - 2.7T/6-speed<br />1998 Buick Regal GS - L67/4T65E-HD

  10. #10
    Lurker
    Join Date
    Nov 2005
    Posts
    648
    Thanks
    0
    Thanked 1 Time in 1 Post

    Re: do i really need front jounce bumpers and/or boots?

    So when I have these Intrax's put in with new KYB struts and HD mounts, I should have them use the stock boot and jounce bumpers and NOT buy the KYB book/bumper combo thingy? I would NOT have to cut the stock ones for things to work?

    I love the combo thing in the rear, works so nice
    http://www.spudfiles.com
    Blast vegetables and whatever else you can think of! :laugh:

    1996 3500GP Coupe, "Bright White"
    3500 swap, 60degreeV6 1393 Grind Cam, Ported Intakes, Comp Cams Valve Springs, 65mm TB, Custom Pushrods, S&S Headers, 97 PCM with DHP Powrtuner, 2.5"; back to dual Hooker Aerochambers, SS Brake Lines, Addco Swaybar, KYB's, Intrax Springs, STB's, etc!

  11. #11

    Re: do i really need front jounce bumpers and/or boots?

    nope, you definately don't want to buy the KYB boots/bumpers or you'll have the same problem i did. i would use the stock bumpers over again and just cut them in half if you have to (and from the sounds of it you will). as far as boots go, i don't know if you can reuse the stock boots over again with the Intrax springs or not? i'm planning on buying Monroe boots/bumpers for my car since i already threw the stock stuff away.

    here is a pic of the KYB jounce bumper/boot - as you can see it is one piece and if you were to cut the jounce bumper section in half, you would lose the boot:



    this is what you should get if you get new parts - the boot and bumper are separate pieces (McQuay-Norris brand shown):





    the boot "clamps" over the bumper itself. you can only cut so much off and still be able to attach the boot to the bumper.

    and i think this is where you would want to cut the jounce bumper in half:



    <br /><br />2000 Audi A6 Quattro - 2.7T/6-speed<br />1998 Buick Regal GS - L67/4T65E-HD

  12. #12

    Join Date
    Apr 2006
    Posts
    187
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Re: do i really need front jounce bumpers and/or boots?

    I had the exact same set up and problem. I just cut out a section of the bumper and re-attached the boot to it. Front and rear ones. It really wasn't a big deal to do and they have been fine for the past 6 months.
    2002 Pontiac Grand Prix&nbsp;GTP Coupe - Supercharged

  13. #13

    Join Date
    Feb 2004
    Location
    RI / SC
    Posts
    3,957
    Thanks
    0
    Thanked 4 Times in 3 Posts

    Re: do i really need front jounce bumpers and/or boots?

    Just to clarify, has anyone actually had to cut the stock bumpers when using GR2s/Intraxes?
    -Tony
    gtsdurango.net
    '04 Dakota SLT Quad Cab 4x4
    ​ - teh gas guzzling daily
    '90 Turbo Grand Prix STE - Crane H260 Cam, Getrag 282 Swap, 1.6 Rockers, Intrax Front Lowering Springs, KYB GR2s, 34mm Sway Bar, CS FSTB, AWeb RSTB, ES Poly Sway Bar Bushings, Cooper Cobra 245/50s, Speed Primer, Hail Speed Dents, NFG Keyless Entry, Lots of Extra Wiring - Running once again! Sorta! Not really...
    '92 Gutless Supreme SL - RIP 5-10 | '90 Turbo Grand Prix - RIP 6-15-05

  14. #14
    19Cutlass94's Avatar
    Join Date
    Apr 2005
    Location
    Texas
    Posts
    10,522
    Thanks
    51
    Thanked 575 Times in 347 Posts

    Re: do i really need front jounce bumpers and/or boots?

    My jounce bumper is down to about 1/2". I cut it in half, but then the spring settled more and I had to cut it again. You see where ther top part is where its thick... Ive got pretty much just that.
    Jay

    1994 Oldsmobile Cultass Supreme SL
    3400/Getrag 284 5spd
    1995 Chevy K1500 350c.i. 5spd Z71
    350/NV3500 5spd
    2014 Chevrolet Malibu LS
    Stock - Daily Driver

  15. #15

    Re: do i really need front jounce bumpers and/or boots?

    damn....i think i'm just going to try to run without any jounce bumper or boot. if that's all you have left of the jounce bumper how could you install the boot?
    <br /><br />2000 Audi A6 Quattro - 2.7T/6-speed<br />1998 Buick Regal GS - L67/4T65E-HD

Visitors found this page by searching for:

what does a jounce bumper do

what is a jounce bumper

what do jounce bumpers do

strut jounce bumper

do you need jounce bumpers

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •