its been like a month since i got new tires on my car, i never had problems launching, but recently when i dump the clutch at any rpms it seem to shake a lot(no problems at all when i drive normal). it feels like the tire skips on the road instead of just making a clean take off. the whole car shakes especially the transmission. does anyone know what this may be? one other thing, when i got the tires changed, one of the lug nuts got stripped and it wouldnt come off the stud so they had to cut off the whole stud and replace it. i dont know if they did a shitty job and that might be the reason... any help would be great thx
FYI. the car was launching fine with new tires until two days ago

 

More Grip, so your getting more wheel hop, Maybe some solid diff bushings.

 

I don't know. Have the rear undercarriage inspected for worn or broken parts.

 

+1...

Start there op......look under your car for this:


Its a result of this bushing going out:




-J

 

^^ thats exaclty what I was thinking, torn/worn bushing.

 

OP, if thats the case, the fix is here:

SPL Parts solid diff bushings:
http://splparts.com/store/product-info.php?pid37.html

https://my350z.com/forum/suspension/...wheel-hop.html

Looks like this:
SPL rear solid diff bushing in subframe - rear diff STUD:

Front Diff ears:



-J

 

I would say to inspect the subframe bushings as well, but thats not as likely.....

Review this thread:
https://my350z.com/forum/mid-atlanti...-bushings.html

-J

 

poor launch technique doesnt help any either

 

If it is not the bushing then it might just be that the tires are broken in. First few miles on new tires can be a bit slippery. Wheel hop seems to be a common problem for some.

 

thats what i thought too. ive never wheel hop problems drag racing until i started drag racing my Z. sure enough this was what was causing it. I thought i was doing something wrong, lol. if you drag race a lot i would also consider getting a differential brace.

 

[QUOTE=JasonZ-YA;8457797]OP, if thats the case, the fix is here:

SPL Parts solid diff bushings:
http://splparts.com/store/product-info.php?pid37.html

https://my350z.com/forum/suspension/...wheel-hop.html

Looks like this:
SPL rear solid diff bushing in subframe - rear diff STUD:


JDM finned diff cover FTW

 

Curious what fixed this issue. I did 4k launch yesterday with arc uprev and my car started vibrating especially the tranny. I am unable to visualize the rear diff bushing cuz the RAS is blocking it. Did new bushings fixed the vibration? Don't burn me with "use search" and i know this is a 7yr old thread.. Thanks in advance

 

It could be so many things..... Bushing, Springs, Track, Alinement, Tire Pressure, Ect .........

Tire pressure has alot to do with it.

Example:
Last time out at the track, car set up for the strip, the works, Full slicks. I launch at 5000rpm. Was running 18psi in slicks and had bad tire shake, dropped it to 16psi and it went away..... other times at the track ran 18psi with no problems.