I'm having the bodyshop reshape the rear to flare it as much as possible... they talked me into keeping the overall 928 look. The rears are using a 19" X 10" wheel to balance the car's look better. Question is how close should I get from tire to inner fender considering the rear wheel steering without rubbing?

Rick... see picts.

 

the beautiful thing about 928s, is that the action of the rear wheel only helps with clearance as you drive. (meaning, its worse case just sitting there)

i have less than a credit card clearance and no rubbing, using 11" wide 18" rims with 305x35s or 30s.
(or 315x30, or even 335s with my bat roll job)

MK

 

Is there anybody offering weld in rear fenders that are close to the GTS profile?

 

You can buy the GTS rear quarters from Porsche... for about $2500 each. The only other option I know of is fiberglass like Louis Ott, Strosek, or Jacquemond.

 

Actually, I just bought both rear GTS quarters from Porsche. There are none in the US. Only in Germany. They currently have 8 lefts, & 9 rights. After they are gone they are expected to go on AP - automatic phaseout, unless there is a sudden market for them. I just paid $1121.53 each wholesale for them.(they listed at $1401.92 each)
Hammer

 

I stand corrected. Others have posted the $2500 number before. I guess that's the insurance company price.

 

Don't worry Dog, I wasn't tryin' to correct anybody, just thought I could help!
Hammer

 

I don't mean to challenge you Mark, but it makes absolutely no sense to me!!!! I know many 928's that have a perfect stance when parked, but rub when driven. The rear wheels DO go IN the fender well on the road, otherwise the whole point of an independent suspension is moot...

In my experience with widebodies and flares, many people tend to overlook the angle at which the rear wheel goes into the fender well. In a custom application, when the clearrance is even around the tire, it is the REAR of the rear tire that would rub first. I'm currently suffering from this on one of my cars, and it hasn't been fun dealing with it. Note that in stock form, there is plenty of clearance back there, but if the bodyshop is touching that area too, do make sure to keep more room in the back than on top.

...just my $0.02

 

Through out what you learned about other cars, the weisach and the 928 body shape, in the fender is different. if it rubs when you drive it, you didnt have the clearance to begin with, as many sharks tires are below the fender line, where you really want it just over the tire for most street applications.
the independant suspension allows for the wheel to go in as i goes up on a radius of the lower and upper unequal length control arms. the toe-in effect can give you a rub on the inside, or the movement can make you rub on the inside as well if you are too far in to begin with.

Ive set up 5 928s this way to use larger tires ,and none of them had a rubbing problem.

the other side that can be an issue is the alignment set up. generally most of the cars ive worked with have been at least 1.2degrees camber in the rear, and i rolled all of the fenders to start, so there was some massaging of the fender shape from the beginning

Mk

 

Rick (and Mark K.)

Rick, it looks like those flares are gonna be great! I can't wait for the show later this winter.

Mark, Thanks for clearing up the fender rubbing issue. I was thinking that the W-axle would swing at the same angle as the links. You confirmed it. Also I saw your wheel size on the post above. so ignore that part of my PM. Thanks - Ruf

 

Rufus, I'm taking your advice and keeping the Porscheness (hey a new word) of the wheel well shape.

Rick

 

Hey Rick,

I have spacers on the rear that required a mild rolling of the rear fender. Actually it was a matter of grabbing and pulling the fender out slightly. My car sits pretty low in the back, with the widest portion of the tire up in the fender well. There is barely enough room to push my pinky between the sidewall and the inner fender in the rear. There's a roller coaster section on the back straight of one of our local tracks that I've bottomed out on a few times (bad line w/a passenger) and the tires have never rubbed.

I'm with Mark on this one, I think you can go pretty close without an issue. From the looks of your pics, I'd say you don't have anything to worry about.

 

I did quite a bit of measuring, drawing, calculating and hoping when I made my rear fender flares, actually entire new rear fender. With the new fender on, I took the springs out and let the car down as far as it would go until the shock hit the urethane snubber, then jumped on the rear just to be sure. All the calculating worked out and I didn't have a clearance problem. The outside of the tire followed the inside of the new fender all the way up. You can figure that the rear wheel will go up (or the car body down) about 5" and as it does so, the top of the wheel will move inward about 3/4". It gets more negative camber as the suspension deflects. As Mark Kibort said, how much clearance you need on the inside of the wheel well depends on rear wheel alignment and camber setting when at rest. I think if you have 3/4" between the inner side of the wheel well and tire, you'll be ok. Before the body shop gets too far along, it would be a good plan to take the springs off the shocks and lower the body just to make sure. Now is the time to find any problems.

Here is a pic of mine when it was all the way down for the test and another after the fender was blended in to match the shape of the body. Wheels are 12x17 and the tires 335.

https://rennlist.com/forums/attachme...id=89398&stc=1
Clearance1_640x480.jpg
https://rennlist.com/forums/attachme...id=89399&stc=1
RtRearPrimer_640x480.jpg

 

louis, that looks awesome

 

Thanks. I tried to keep to a GTS shape, but with about 1.5" more width and I added a bit of late 60's muscle car "hump" to it. It looks to me like that's the way the 928 should have been from the start. Of course I am biased and not objective on these.