Mr. Vapor

Ok,

Last week i raced from a dig against my friend with an LS1-FC RX7. i'm trying to put 400whp through stock axles...im guessing the insane amounts of wheel hop didnt help anything.

fast forward to today, im driving and im noticing some pretty nasty vibrations from the car that i can feel in the shifter, steering wheel and even gas pedal. at first i thought it was a bent/broken axle, perhaps an inner CV. i show no symptoms of a broken CV. boots are in good shape, no clicking during turns (although this would only be the outer joint)

Heres what i found out today.

It only vibrates from about 3900rpms - 4100rpms. THATS is. no place else.
It vibrates in neutral if i reve it to this rev range i still get the vibrations, which tells me it is not the axles since they are not engaged or moving. any ideas?!

upon further thought: Could it be something in the harmonics? Crank pulley? Clutch? flywheel? **** i dunno anyone?


Modified by Mr. Vapor at 8:54 PM 6/1/2006

b_serious

motor mounts?

Mr. Vapor

I have the inserts, but wouldnt it vibrate all the time?

it LITERALLY only vibrates between 3900 and 4100 RPMs

b_serious

in my dailey the mounts went out and virbrated only at 3500, im just sayin its a maybe for you im not sure though

Mr. Vapor

ill def check them out man, thanks for the heads up

Mr. Vapor

bumpage