vibration on acceleration

[stmotorsports]

the car in question is my girl's B20vtec/GSR swapped EK hatch. Its got a really pronounced vibration on acceleration only, the harder you accelerate the worse the vibration. Coasting and decel are fine, no issues. I got the car from a buddy of mine who did the swap, he said it's always been like that ever since the swap. Is this most likely to be an axle/midshaft or motor mount problem?

 

[Turbo&Auto]

Sounds like a motor mount

Edit: or bad axle. I blew a hole in my Matrix axle and it was doing the same thing. It was fine under an easy cruise but when I would accelerate hard it would wobble/vibrate pretty badly. Check the axles and motor mounts.

 

[racermp]

also check if the axels are shakin around, maybe a bent axel?

i saw put it on a lift and run it and see if any of the axels are shakin

 

[get_nick]

axle, motor mounts, check to see if the wheel lugs are tight. haha, seen that happen to.

 

[racermp]

do u have aftermarket wheels? maybe they r missing hub centric rings (leaving too much gap between the hub and the hub bore hole on the rim), thats happened to me in a audi before.

 

[stmotorsports]

i doubt it would be a wheel issue because like i said it only does it when i'm in the throttle. I would think a wheel issue would do it all the time whenever the car is rolling

i noticed today it doesnt just shake front to back or up & down, it's more of a side-side/diagonal shimmy- makes me think motor mount... or poorly machined axles binding up, I've had that prob i dunno how many times with replacement axles (mostly napa lifetimes )

will be checking the car out tomorrow