vibrations under hard acceleration in 1st & 2nd

[jamievt]

as above did my first track day few days ago and found out that under hard accleration the whole car judders/vibrates really baddly basically makes everything shake just wondering if anyone knows hat it could be its a cup 172 so know its not traction control killing the power so a bit stuck
thanks

 

[Danny-ACE!]

Cv joint or top mounts iirc?

 

[jamievt]

thanks ill have a look tomorrow i know my front shock is sha*ged so possibilty could be that?

 

[-J-]

Just in 1st and 2nd?

 

[jamievt]

yes just first and second when i plant my foot down gradual accleration is not so bad slight rumble hard foot down feels like an earth quake in my car...

 

[barnesautos]

Mine was exhaust manifold touching subframe shield, changed mounts and it's gone.

 

[Carbon maniac]

Could be as simple as the tracking is out i had similer on my 172

 

[-J-]

I had a similar sounding issue with
my Cup.

Accelerating hard the car would shake its tits off, gradual acceleration or holding a set speed all was ok.

Tried all sorts, brakes, shafts, ball joints,
Wheels and brake discs balanced nothing fixed it.

Eventually not the bullet and put a new gearbox in and issue was solved, turned out to be a shagged diff.

 

[stevescort172]

on my cup it was the dogbone mount, would also do it under hard acceleration

 

[neilwilkes]

Mines the same as well,been told its the diff on the way out!