C4TT

Great replies guys!
Not sure how much negative camber is too much for mostly street usage, but I would think that near -2 would kill tires quickly especially with the power I push out.

So bottom line... Will a 5mm spacer (with new lugs) fill the well better?

J-McDonald

Greg,

In addition to what others have said, tires can have an effect on perceived wideness. I'll bet that the black car has 255/40 rear tires. If you have narrower tires (with higher aspect ratio) - like the 245's you mentioned in your post, the car will sit higher and the wheels will look more inset.

Take a look at the pictures of my car in website referenced below - it has 255/40 rear tires.

I remember reading somewhere that the factory specification for 17 inch cup wheels is 205/50 (front) and 255/40 (rear).

Good luck!

C4TT

Thanks J!
Nice looking rag top you got there!
I guess more rubber and a spacer would widen the look.

G

Cupcar#12

Oh one more thing on the C4-
the Drive system is sensitive to the aspect ratio of your tires - you need to make sure you have an overall tire height that is equal to the stock diameter.
personally i would have a set of wheels made and not use spacers.
my 2 cents

Arjan B.

May be I choose the wrong word for "damage', but what I ment to say is that usual the center line from the rims and the bearing should be somwhere in line, but I have seen cars [no Porsche I have to admit] who had bearings replaced in early stage by wrong wheel offset and spacers. It was only a warning what could cause some early wear from the bearings.

Jeff Curtis

C4TT, my OPINION here, if you don't need spacers for physical/mechanical reasons, and only want them for cosmetic purposes - forgo the idea!

Really, 5mm wouldn't make much of a visual difference...besides, I may be mistaken, but I've been through this myself, a 5mm spacer is difficult to come by...and I really don't think the factory studs or lugs are designed for them.

You said it yourself, think about the power you're pushing and the fact that you'd only have ~6 threads engaged.

If you're going to do it, install longer wheelstuds, Pelican sells them for about $47 for a pack of 10, 52mm studs. Even with no spacers, the added 7mm (really ~5mm) still allows proper seating of your aluminum lug nuts.

Also, -2deg. camber isn't too much for the street, while admittedly it's more than factory spec. -1 to -1.5deg. is a good "conservative" setting.

clarkey

My RS has had spacers and longer studs on it since 1993. As far as I can tell from the service history, the wheel bearings have never been replaced.

sgschroeder

The 17" Cups fit just fine on a '90 C4 Cab with no spacers - using 205/50 and 255/40 tires. I have converted many 964s to this application. It is a great handling improvement. You can also use the 18" techno wheels with 20mm. spacers in the rear with no problems.

C4TT

What are Techno wheels?

Jeff Curtis

What we commonly refer to as the "Turbo Twist" - the directional flat-faced wheels that came on the TT (that were hollow) and solid (heavy) versions appeared on the 993...they are available in both 17" and 18".

C4TT

Ahhhh HA!
I know them as the Turbo Twist.. Thanks Jeff!

By the way is that your spec racer in the sig? That must be a blast. I know a guy who races quite a bit, and who actually held a record for a while.. Guy name John Steinmetz.. Ring any bells?