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) I dont know if its turbo related? **** i dunno anyone that can help would be great

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?

 

check your mounts

 

you're the second person to say that....ive got the motor mount inserts, but i think my driver side mount (the fluid filled one) is f#ucked......could this cause the vibrations at only a certain RPM level?

 

Sure it could. Go with a solid style mount like the Innovative or HASport for atleast that damn driverside one.. the stock one is basically useless and causes more trouble than anything else.

 

Thanks!