need simple height adjustment tip on 1 side

[kretzj]

I just added spacers on my 911 rear wheels and I noticed the drivers side tire rubs the lip but the passenger's side does not. After some measuring, it appears that the driver side rear is ~ 1in lower than the passenger side rear. What do I adjust on the driver's side carrera spring plate to raise the rear up 1 inch? Is it this simple or do I need to take it to a shop?

Thanks,

Jon

[bell]

if the rear is that far off re-measure from level ground to the torsion tube at the end of the springplate and see if that number is off also, if it is then it is a suspension issue, as you need to reset the torsion bars (ride height)...which requires a full alignment.
if the measurement is the same on both sides it's a fender issue.

if it ends up needs a ride height adjustment i'd pay for a full corner balance/ride height adjust/alignment and replace the shocks if they are old. it'll be a big bill but will make your 911 feel like a brand new car

you can't change the rear ride height without changing the alignment settings, there is an adjustment with the eccentric bolts in the springplate..... but they don't move that much and are mainly for fine tuning the alignment.
to reset the rear height you need to pull the torsion bar out and reindex it, it take a few trys usually to get it where you want, last time i did mine it took 3 full times.....next time i'll pay someone

[Joe Bob]

Adjust the front torsion bar....if you have wheel scales you mat need to adjust the other side as well....

[bell]

damn why didn't i think of that LOL
wouldn't this throw off his alignment though? providing it's dialed in....

[911pcars]

There's no definitive answer based on what is known so far. It could be just the rear corner that needs adjustment. OTOH, it could be the front end affecting the rear. To isolate, jack up the front end at a mid-point between the two front wheels, then recheck the rear ride heights. If the difference still exists, its the rear corner. If it's now okay, the front end corner heights have affected the rear - a little more complicated since both ends must now be equalized.

Check the archives on corner balancing and "tripod method". However, reserve a long evening to read the posts.

"if the measurement is the same on both sides it's a fender issue......"

... uhh, as in - the fenders are now lower? It's probably a ride height issue on both sides (i.e. torsion bar adj. on both sides - can be reset).

What size wheels/tires have you installed? They must really be wide to touch the lip. The typical wider tires/wheels people try to use rub about 2" above the lip.

Measure from the ground to the wheel well lip (12 o'clock) and report to us.

Don't touch any adjustments until you're up to speed on ride height settings and how to adjust.

Sherwood

[Zeke]

Just remember in all of this that Porsche bodies are not symmetrical. The driver's side rear usually rubs before any other.

I'm still waiting for the REAL answer for this fact. Some say the Stig did it, some say the drive line is installed off center. None of it has been proven.

[Flieger]

I think it was the super-sized cheeseburger at lunch before the afternoon track session.

And the fact that most older 911s are not corner balanced properly and the factory could not set up the suspension with the primary driver in the car. If the car is set up to be equal across and then an imbalance is put in in the form of a driver's weight without a passenger, the driver's side will be lower. The driver sits toward the rear, which is already heavier and has less roll stifness and a softer relative suspension setting than the front.

My $.02

[efhughes3]

Putting the year of your car and/or some details of what you have in your signature is also helpful if you come here to ask for help. Rear height adjustment varies in ease by year and components installed.

[Chuck Moreland]

1 inch height difference should be corrected. However, solving the height problem will not solve the rubbing problem. As soone as you load the tire up in a turn, it will compress to the same position.

You need to pull the tire in, or get more flare.

There are several ways to do this; change the backspacing, more camber, different tire size etc.