74carreraturbo

I have the Bilstein/H&R green combo and the car sits noticeably higher in the rear than the front... I thought the tires might be the cause but they are the standard 265/35/18 and 225/40/18. Is this a product of the greens or is there something I can do to drop the rear a little bit? Here is a pic for reference although I think it might look even worse because its on a slight pavement curve.

1990-964

Hello,

Are your spring perches adjusted all the way down in the rear? If they are then there will not be any way to affect ride height any further on that end. A slight raising of the front will transfer some weight to the rear but not enough to change too much. I ran into this to a certain extent with those dampers and B&G springs. Since I was not willing to cut my springs and really mess things up I went the coil-over route to get the ride height that I was after. Sorry if that is not the answer you wanted, but your car looks pretty damn good anyway!

Good Luck

JohnMetro

+ 1 on the car looking good! Love those wheels. Why is it that I get just as big a buzz looking at other peoples Porsches as well as my own. I know they are all the same, but they all look slightly different too, if you know what I mean.

Also, never used to be a fan of the red ones, but yours makes me want one

PS. Some Big Reds (or just paint your calipers) would really set it off, as those wheels have plenty of "show-through"!

Computamedic

Hi,

My car has the same wheel/tyre sizes and H&R Greens but looks little lower at the rear than yours so I suspect there is some wriggle room in the spring perches to get yours a little lower.

Regards

Dave

Geoffrey

The car should really have some rake to it for proper handling. Somewhere between 1 and 1.5 degrees is the norm, but yours looks like it has more than that. I would raise the front some and possibly lower the rear depending on what the measurements are.

Of course, the proper way is to measure the ride height at the factory indicated points under the chassis and I would suggest setting it to RS ride height which you should be able to get to with your spring/damper combination. If you set the car as low as the yellow one, you'll experience added bumpsteer as the steering rack geometry is changed.

If you do anything, you'll of course need to have the car aligned and corner balancing is suggested.

ducnine

I got my H&R Greens and am waiting patiently for my Bilsteins. I am getting anxious to get my car all set for the spring/summer driving season.

So Geoffrey when you say the car needs about 1-1.5 degrees of rake, do you mean it should be lower in the rear than in the front? Also the RS ride height with everything else being the same in the suspension (except shocks/springs) should not induce any bumpsteer right?

I never paid much attention to this in my previous and current cars. Just check the air in the tires periodically and go.

Geoffrey

Rake should be with the front lower than the rear.

The 964 hub carrier geometry is not all that good and there will always be bump steer with the 964, but it is aggrivated by lowering the car and will put the roll center underground. The GT2 Evo uprights with the revised geometry help bump steer considerably.

rideshootanddrink

Do you have a picture of EVO uprights? Thanks in advance.

kgorman

Here is a picture of my car lowered to RS specs with Bilstein/H&R greens. Mine is a '89, so the rear perches are a bit different, but you get the idea. I would get a good pcar shop to perform the alignment/ride height adjustment for you.

74carreraturbo

thats much more like what i'm looking for! The shop i had it in mentioned something about the bilstein shock being adjustable but them not having the proper tool to adjust it.. However, I would think that adjustment would be for stiffness, not ride height? I guess I'm just confused as to what they're telling me but they are a body shop, not a p-car specialist!

1990-964

Hi Again,

On the Bilstein HDs which are the only ones available for the 964 ride height is the only thing that can be adjusted. There is no adjustment for compression or rebound. They can be revalved at Bilstein. The special tools are lock-ring spanners which Bilstein is kind enough not to supply with the shocks. I ended up making my own, but a brass drift and a mallet can suffice if no wrenches are available. Good Luck.

Geoffrey

Just buy the correct tool, don't pound the perches with a drift. If your shop does not have the correct tools, then likely they are not the shop to corner balance and align your car.

Gary R.

Here, all set...

1990-964

I was not suggesting that anyone begin pounding on the perches. A brass drift which is softer than the aluminum perch lockring is what I meant to use to loosen the lockring. A few taps should be enough. At that point the perch itself will move without excessive effort . I only mentioned that as a last resort if the correct tools cannot be had. It would not be my first choice since when faced with this problem I made my own wrenches, but it was just an idea if all else fails.

Marc Shaw

FWIW, the H&R set I have are height adjustable (but not rebound or compression) and came with the correct wrenches.

Marc