Shuddering when going for it......

[Goosey]

I have a UK spec, whipple supercharged GT with about 830bhp, recently added a small pulley a QA1 Carbon fibre drive shaft, mantic clutch and gforce axles. Every now and then when giving it some power in say 3d or 4th i will get a shuddering sensation, if i back off the shuddering continues but less so then slow right down it goes. The next time i get on the power it can be fine there seems to be no logic to it. I know i am not breaking traction and you can really feel the sensation of juddering, it almost puts you off going heavy on the gas pedal? Is this a sympton of the drive train set up? when cruising and taking it easy there is no NVH, and i can comfortably sit at 80 with no noise at all. Get on the gs, get to 80 in 3rd and like i say a shudder. Would welcome views as to what it might be. Checked all the obvious stuff such as wheel nuts etc, but this seems an odd one.

Sponsored

 

[nastang87xx]

Almost sounds like the driveshaft is not balanced or not installed right...? Is the car yawing left to right/right to left at all? Or is it a vibration. Only in 3rd or 4th?

 

[Goosey]

No it doesn't pull to right ot left. Had a bit more time to play today, it comes in when WOT in 2nd, 3rd 4th, hitting 6k revs. Its not like a shudder or vibration its feels like a knocking and you can feel it under the car. I am going to get the checked but sending something back to the US for them to say its fine is going to cost big time !!!!

Sponsored