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Suspension Soft & Bouncy After Motor Change

boostdef
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boostdef Enthusiast

boostdef

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Hi,

Can anyone tell me whats going on? I have just changed the motor in an R33 gtst which has khoni adjustables at the front, and the from suspension is extremely soft and bounces like a boat in waves as im driving along.

I did not touch the suspension at all, just a simple jack the car up, change the motor and put it back down?? wtf?

Any help would be greatly appreciated :blink:

nisskid Grand Master

nisskid

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sway bars still connected properly? dont think u need to take them off to change the engine, but it does go near to the sump so its possible. also did u have a strut brace on before? not usually a noticeable "handling" difference, mostly a mid-corner grip thing.

also was it a straight engine swap? u didnt put a heavier engine in did u?

boostdef Enthusiast

boostdef

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sway bars still connected properly? dont think u need to take them off to change the engine, but it does go near to the sump so its possible. also did u have a strut brace on before? not usually a noticeable "handling" difference, mostly a mid-corner grip thing.

also was it a straight engine swap? u didnt put a heavier engine in did u?

Straight engine swap by replacing a S1 motor with a S2 motor.I dont recall at all undoing any sway bars. Was pretty much engine mounts, bellhousing bolts and the little things here and there and that was it.The shocks i think are khoni adjustables with a bolt at the top, and i think a something to adjust underneath.Its just like they are now ultra soft and i go over 1 bump and the front goes up and down constantly for about 10 seconds. Plus, it is bottoming out a lot more obviously due to the softness :(Can I simply adjust them at all? Is it the top bolt i adjust or underneath? (Sorry new to this)

boostdef Enthusiast

boostdef

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Didnt drop the engine in to hard and bust the seals in the shocks did you?

Naa it all seemed smooth as! Dropped it in extremely carefully. But I suppose thats a possibility I may have done something.Another thing I forgot to mention is they are Coilover types i think. Ones with the adjuster at the bottom of the spring and the bolt at the top. Can it simply be a case of stiffening the spring? (Not that it explains what the go is though :P)

nisskid Grand Master

nisskid

Posted
Posted
Straight engine swap by replacing a S1 motor with a S2 motor.I dont recall at all undoing any sway bars. Was pretty much engine mounts, bellhousing bolts and the little things here and there and that was it.The shocks i think are khoni adjustables with a bolt at the top, and i think a something to adjust underneath.Its just like they are now ultra soft and i go over 1 bump and the front goes up and down constantly for about 10 seconds. Plus, it is bottoming out a lot more obviously due to the softness :(Can I simply adjust them at all? Is it the top bolt i adjust or underneath? (Sorry new to this)

sounds like ur shocks are buggered for some reason, are they on full hard adjustment wise?

boostdef Enthusiast

boostdef

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sounds like ur shocks are buggered for some reason, are they on full hard adjustment wise?

The bottom coil adjustment is about half/half, and the top bolt is just on the thread (ie the shaft of the shocks are just above the top of the bolt.

Would having the wheels in the air for an extended time do this? Because thats the only thing I can think of really.

petern Enthusiast

petern

Posted
Posted (edited)

i think you just answered your own question in that last sentence......

having the the wheels in the air for an extended period would put pressure on the shocks - weight of the wheels and brakes.

I know when I disconnect the shocks on the rear on my 1600, i can push down on the back and bounces a fair bit.

I would say shocks are stuffed!

Edited by petern
nisskid Grand Master

nisskid

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wheels in the air shouldnt bust ur shocks, as they are still in the static position, but will put a bit of pressure on the travel stops if it is infact the shocks which are suspending the wheel, often its the arms/rods or half shaft suspending the wheels up, and the shocks arent.

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