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vibration of my 280zx!!!!


Z-Monster

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hi guys,

 

i have had my zx for awhile now and its almost perfect witht the exception of this vibration i managed to get rid of before in the past but now.. its just annoying the F out of me. first the specs of my car...

 

rb25det, wheel spacers all round(new and machined to the tee), 17" rims (straight) with new tires, sylvia rack steering rack customed engine mounts along with long/prop shaft, r200 diff etc.

 

ok so now my problem... i have had a slight vibration to my steering which effects the whole car between to 50 to 75 mph. beyond 75mph i am smooth as silk aside from the road modulations and some tyre vibration at times.... so now my question is to how should i go about this problem... i have not done on wheel balancing, but i'm affraid its a bent long shaft or a shitty engine mount.

 

I have left my car off gear and glided at 60mph just to find out if it was my drivetrain. the vibration was still evident so i used that and concluded that the vibration has nothing to do with the drivetrain but my wheels.

 

pls give me some suggestion to tackle this problem...

 

thanx guys.

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Definatly balance the wheels, and take them to a place that can re-index your tires (also called "road force"). Also, just because the vibration still exists at 60mph in neutral doesn't exclude the fact that it could still be a driveline vibration. The driveshaft, rear end, etc. are still rotating, so I would also advise that you check your driveline angles. But first, I would definately get your wheel assemblies balanced and re-indexed. You may even have a bent rim that's causing the problem -- I wouldn't think so since you say it drives smooth before 50 and after 75, but then again, I've seen some weird stuff happen with vibrations. Good luck

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