I've just installed H&R spacers to my 2005 996 C4S. The ones in front are 7mm and the ones in the back are 15mm. The front bolts are 52mm and the ones in back are 60mm. I am experiencing a lot of vibration above 80 mph ?? Has anyone in the forum has experience this kind of problem ? And what was the solution ?

 

Do you know wich ones are causing the vibration? If not take a pair off and try isolating wich are causing it.

 

Thanks, Redridge:

It seems that is coming from the front but, not sure. I will try taking the fronts out first, as the H&R 7mm spacers have no lip extension. However, I thought the extended lip was not nessesary because, the original lip from the car's hub, still sticks out ?

 

Keep us posted. I am planning on using spacers on my C4S also. Thanks.

 

You need to get the hubcentric ones for the front. I am willing to bet that it is because of the lack of extension lip on the front spacers the wheels are not 100% centered. I have had this problem on my m3 before and I would never buy non hub centric spacers again.

 

The problem is that 7mm is not thick enough to be hubcentric, thats why it is using the hubcentric of the hub.

Does the OP have cheap aftermarket wheels? Sometimes the wheels are not hubcentric and this is where the misalignement comes from.

Like I said, should try to find out where the problem is coming from first.

edit: btw I have H&R 7mm spacers and are not hubcentric, though my wheel is hubcentric and is centered by the hubcentric underneath the spacers.

 

I just ordered 15mm HR spacers for front / rear and neccessary bolts- Will post how it drives after installing them next weekend.

 

My car has the original Porsche wheels. I will try what Redridge said, I will take the front spacers out and see if the vibration disappears ?

 

I'm using Porsche's 7mm spacers all around and have no unusual vibrations whatsoever.

 

Are you using OEM rims? If you have cheaper aftermarkets you will likely get a vibration from the 7mm...

I have 15mm all around in order to give me true hubcentric. NO VIBES!

 

Spacers sucketh

 

ditto on the 7mm spacers with cheapo aftermarket rims. I have knock-off carrera five-spokes and had a huge vibration (worse in the front) with the 7mm spacers. My H&R 15 mm spacers work great with no problems at all. I called H&R about the 7mm spacers and they said that if the rim is not oem or another high quality brand, the wheel might not center perfectly with the use of the 7mm spacers because not enough of the hub lip will stick out to properly center the aftermarket wheel. Good luck.

 

I have no aftermarket wheels. Original all around.

 

When using spacers without the hubcentric lips, you can always try to torque the lugs while the wheel is still up in the air. Get all the lugs in hand-tight so the ball/taper seat of the lugs are snug in the wheel. Only then do you tighten (star pattern). this is tricky for the front b/c there's typically no way to brace the wheel like in the rear whereupon one can simply use the e-brake. having someone sit in the car and depress the brakes is one way but not always safe.

Also, take some steel wool and clean the hub ring and faces as well as spacers from any rust or debris as these inconsistencies could also aggravate vibration issues.

If all else fails, try to get a set of spacers that do have the hubcentric lips on them.

 

Thanks SRC4S.

I will try what you said. I'll let you know.............