As the title states, I have the SPL solid diff bushes installed, and am still getting wheel hop, although it has been reduced quite a lot.

Inspected the rest of the bushes while I was under the car, and they don't look too bad. Time to look at replacing them as well? or bite the bullet and start saving for some coilovers? or both?

Ideas? Thoughts?

Standard shocks n springs, whiteline adjustable sways (medium settings) on an 03 Z, running 245/285 19s.

 

adjust your tire pressure, what are you running?

oh and... just a thought - don't get mad - but... learn how to launch your car?

nine times out of ten YOU are doing it wrong, not the car.

the stock springs should be giving you enough rear transfer, and the wide tires should be making you bog if anything.

 

Running Yoko Advan sport v103s at around 38psi.

Launching is not an issue as the wheel hop is occurring during spirited street driving and at the track. IE come hard out of a low speed corner, if a wheel looses traction, the banging starts. If I deliberately start trying to turn the tyres to smoke (which I'm not really too much of a fan of, I thought I would do a little "testing" so to speak) however, no hop.

Should of mentioned the conditions that it happens in at the start. Sorry about that. I under stand what your saying about the learning to launch the car though. And although dragging the Z isn't really my thing, I have been through the whole learning process in another car and its definitely not as easy as it looks.

 

Maybe try lowering the pressure in increments and seeing how that works for you. Try 34-35 psi.

 

Wheel hop is a 6 year old discussion. Are you a drag racer? Solid rear axle will take care of it.

 

do you have an open diff?

and lowering to 35 might help. sometimes it can be 1psi that matters.

 

Assuming you're still using the factory VLSD, you've just discovered what a royal POS it is

 

I know it's a 6 year old discussion. No I don't drag my Z. My post above explains what is happening, and am wondering if any road course racers, have come across it, and their fix.

Yeah running the stock sometimesLSD. Damn unpredictable thing that it is. Have my eye on a cusco RS LSD, but that purchase is a while away for me at the moment.
I'm pretty much figuring that once I do upgrade, traction will pick up massively and the loss of grip out of slow corners will be all but non existent, and in turn it will 'cure' the problem.
Next time I'm out on the track, I'll try playing around with tyre pressures some more and see what happens there.

Cheers

 

Since you do not get wheel hop if you put enough power down to overwhelm the tires, the issue is no longer from play in your drivetrain or suspension. The problem you are having is the tire skipping on the pavement, when you are applying barely enough power to overcome static friction. You might be able to reduce wheel hop by:

a. a better LSD to put the power down more evenly
b. better shock damping
c. making sure that you are not reaching the droop or bump limit (suspension travel)
d. playing with your sway bar settings, try stiffening or softening your front and rear bars independently and record the results, and see if you can find a better setting.

 

Thanks Kuah, just the kind of input I was chasing. As I mentioned further up, a diff and coilovers are on the way eventually, so I'll have a play with the sways next time I am home.

Cheers
Shane.

 

sorry to bring a dead thread back.

I have bilstein pss9's
ATS carbon lsd
DSS 900hp axles
running ~32-34psi Falken RT 615
Spl bushes installed and i get heaps of wheel hop / axle tramp.

Next step i have been told is to solid mount the subframe to the chassis. I dont really want to go that way but the tramping HAS TO STOP.

 

your tire would be the first thing I improve...at that power level, the only thing that's going to let you hook on the street is something like an R888 (or similar) and on the dragstrip, a slick

the other thing is the rear subframe bushings - I personally wouldn't do solid ones as that will make the car obnoxious for road use, but Whiteline does a very nice urethane kit