Serious Wheel Hop

1305 Views 14 Replies 7 Participants Last post by Magic, Feb 11, 2002

Bally

Discussion Starter · Feb 7, 2002

I have some serious wheel hop problems. When I launch kinda hard, the rear end just starts bouncing. I dont know exactly where the problem lies, I have fairly new tires, Could it be my suspension? Any help appreiciated

Bally
94 sick BPU supra

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ttmkiv

· #2 · Feb 7, 2002

What kind of tires are you running??

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BLKMGK

· #3 · Feb 7, 2002

Changed anything?

I've got the EXACT same problem! 275 Nitto 555Rs. Car was recently purchased and Eibach lowering springs installed before I received it - I don't know if it did this before the springs but it's pretty bad right now. My plans are to have it aligned with the specs from MKIV.COM and consider going to still wider (315) Nitto DRs. It's also possible that the cold weather and pavement has been causing this. Launching my car is darn near impossible and in second it hops pretty bad from a roll.

Have you added or changed anything ebfore this started? Did it always do this? Anyone else have this problem?

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Mike Hughes

· #4 · Feb 7, 2002

Re: Changed anything?

Guys,

More than a few people have broken their differentials because of wheelhop on a hard launch. So be careful until you get this problem resolved...

BLKMGK said:
I've got the EXACT same problem! 275 Nitto 555Rs. Car was recently purchased and Eibach lowering springs installed before I received it - I don't know if it did this before the springs but it's pretty bad right now. My plans are to have it aligned with the specs from MKIV.COM and consider going to still wider (315) Nitto DRs. It's also possible that the cold weather and pavement has been causing this. Launching my car is darn near impossible and in second it hops pretty bad from a roll.

Have you added or changed anything ebfore this started? Did it always do this? Anyone else have this problem?

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Bally

Discussion Starter · #5 · Feb 7, 2002

I have Kumho 275/45/17 in the rear. Ive started having this problem for about a month or so. It gets really bad when i launch hard, but from a roll there isnt too much hop. But when i launch, it bounces all over the place.
I have stock springs and shocks. Any help?
Bally

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BLKMGK

· #6 · Feb 7, 2002

Another thought

Other than alignement I've also wondered if my shocks are shot. Since it sounds like you've made no other changes that would effect alignement prhaps your shocks are shot? How many miles on them? What's the weather in your area? Cold? If so that will effect traction AND HP production...

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Bally

Discussion Starter · #7 · Feb 8, 2002

My shocks have about 85k to them and the weather here is pretty cold actually. But the problem started way before it actually got really cold.
Im gonna check my shocks and see what turns up. Anything else I should look for?
Bally

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BLKMGK

· #8 · Feb 8, 2002

Look through the List archives...

The MKIV mailing list archives on Yahoo! Groups has th esuggestions directed to me to try and solve this. I think I covered most of what was suggested except to look for worn bushings in the rear suspension. I'm putting that low on my list of possibilities and think alignment and shocks are the most likely culprits if it's a mechanical issue. Alignment first for me using the setup from MKIV.COM and then maybe shocks. My fingers are crossed

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· #9 · Feb 8, 2002

Sounds like bushings to me. I doubt a bad strut would promote wheel hop.

Phil

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BLKMGK

· #10 · Feb 8, 2002

Not damping the rear suspension sure as heck could allow it to hop. Ever seen a car going down the road with trashed shocks? Ever seen one try to brake hard? The wheel dances all over the place! Shocks can indeed cause bigtime problems. What bushing exactly would cause the rear suspension to hop?

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· #11 · Feb 8, 2002

Mine only wheel hops when I go into 2nd gear. What's that from?

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Taimur

· #12 · Feb 8, 2002

I bought my 97 last year with 15,000 miles entirely stock. It had original Michelin MXX3 tires and it used to wheel hop, but never from a roll. I thought the tires were old or the stock suspension was too soft in the rear.

Then I put on Eibach with AGX/KYB shocks and the wheel hop reduced a little bit but was still present. And now a few months a ago I put new 18 inch wheels with sumitomos HTRZ II. 285/35R18. Now I have noticed that my car wheel hop rarely once a while on cold pavement but its still present. Which sux!!

So the conclusion that I came with is that this car has some wheel hop flaw in the design like the 300ZX. But changing the tires & suspension do have some control over it but not entirely . I have seen some adds about upgraded suspension bushings that reduce wheel hop. I have read about these special upgraded suspension bushings which eliminate wheel hop. I have not done any research about this upgrade but if someone can find out it would be great. And I would not want to buy new OEM suspension bushings which I think will not solve the problem.
Thanks,
Taimur.

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The Flash

· #13 · Feb 8, 2002

i am having trouble with wheel hop also.
i have a RPS stage 3 clutch and light flywheel,AGX struts,
eibach springs and 555R drag's.
i have tried different air presure ,different settings on the struts,
heating the tires up and it did not help.
it got worse with the light flywheel.
before i killed the TRD clutch i used to slip it and got very little wheel hop.
Who is using the light flywheel?

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· #14 · Feb 8, 2002

Re: Look through the List archives...

BLKMGK said:
The MKIV mailing list archives on Yahoo! Groups has th esuggestions directed to me to try and solve this. I think I covered most of what was suggested except to look for worn bushings in the rear suspension. I'm putting that low on my list of possibilities and think alignment and shocks are the most likely culprits if it's a mechanical issue. Alignment first for me using the setup from MKIV.COM and then maybe shocks. My fingers are crossed

In my car, 98 VR6 Turbo, the car had really bad wheel hop. Even though its FWD I fixed it by putting stiffer polyurethane bushings in the control arms. This controled the front/back movement, and hence eliminated the wheel hop. Usually, this happens as the stock bushings wear. It was just a suggestion, im new to the forum don't know much about what works and doesn't on Supras.

Phil

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Magic

· #15 · Feb 11, 2002

Tiens seemed to eliminate my wheel hop problems. I was using HKS coilovers before. I think the tiens have better valving and I am sure the helper springs help out a lot with the wheel hop. The HKS's do not have helper springs. A big drawback in my books.

I would defineitly check for blown shocks.

-pete

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