Mark,

I would certainly like to see your video- nothing cynical just genuinely intrigued by your lateral approach in this instance.

What your say about the roller only holds if the operator applies even tension because there is less resistance at the centre of travel. A good operator probably applies more force when working the ends to try and get a more even result. Seems to me that is what they did with my 928's.

Ironically, when looking at your signature photo of the Holbert car, I got the distinct impression the front wing was over rolled at the centre- not that it is a problem. Whether this was the case or just an optical illusion I have no idea.

Rgds

Fred

 

so, if the rolle machine does allow for this kind of compensation, thats good. ill try and post something to show how we do it .

as far as the splitter. yes, it was made out of the old holbert fender, so getting it perfectly straight was impossible. the little uneveness is not much of a concern as the splitters only function is to split the flow , guide what it can into the inlet vent and route the excess out around the car, (rather than going under the car) its surface characteristics is much less critcial than say the surface of a real air foil like the rear wing.

 

How much did they charge for that? Do you know how much they were able to get it pulled out by? Did they cut it and section in material? Very interested in doing the same to mine!

 

Speaking from experience with the baseball bat method....... I suggest double checking ride ht before starting process. Make sure both sides are equal in every way. Ht to ground and existing tire clearance.

I did this on the 87 and thought I was king of the world when the driver side turned out so nice. Then I moved to the passenger side and completely destroyed the lip. The passenger side rode a good 1/2" lower and I made no allowance for it. Everything I did to try to improve the job actually made it worse. It was a sad day in 928 ownership.

The current owner of this car has had both sides returned to stock appearance by a body shop, thank goodness

 

sorry to hear. yes, this happens when some of the things ill show you are not used. but you are already fixed up and its a bummer you had to go through that.
however, its a several step process and its not just stick a bat in there and push them out. ride height independent. its a clearance dependent thing. not a one size fits all, nor a one pass process.

 

learning how to bend and stretch your rear 1/4 panels is a lot like ALL bodywork and painting or even upholstery. Not something to do on anything that you care how it looks or has much value.
Race cars in my opinion are disposable cars given that they are at risk of being totaled or crashed anytime you take one out on the track. Plus have little resale value after you blowup your " last" engine
Ron at 928 International years ago worked the rear quarters on his .....with terrible results.
So practice fender rolling on your kid's Honda or VW !!

 

I rolled the front and rear fenders on my 81 with a round wooden dowel , about 1 1/2 dia . fenders looked stock . I run 315 /35/17 on the rear ,275/40 /17 on the front . My GT will no fit the same tire wheel combo , with the factory rolled fenders.

 

they need to be rolled a little more to fit vs the older cars.. gt spacer or entire rear end size is different i imagine!

 

It was part of the almost $11,000 I paid to have the car painted. They hammered it all the old school way. Putty, sand to find low spots and repeat.
Here's a pic when it was puttied up before a sanding session. Really shows the definition of the fender change. Can see the hammer on the stool. Tire on, tire off, tire on, tire off.

 

doing it the right way... bat beyond the limits but still following the functional curve of the wheel.. always looks best

 

I have an S4 and I have just purchased some 9J Cup2 for the rear to which I will be fitting 255 40 17 AD08. Will I have any clearance issues?

ET if not confirmed, but I am assuming that it is 55 or less.

 

Offset is EVERYTHING ... but there is ample room for 275-295 if it has the right rims.

 

If it is a GTS Cup 2 rim [ET55] it will fit in the S4 no problem with a 255 section and quite probably with a 275 section should you so desire.

To give you some idea of the geometry my 10 inch ET60 rear wheels fitted straight in with 285x30x18 rubber and still plenty of clearance inboard and outboard [no spacers needed].

Rgds

Fred

 

generally, ive nailed down the limits in the rear to be based around backspacing 8" for 11" rims.... that's a perfect fit with just barely enough room in the inside as well for a 305 tire, and a requirement of some rolling on the fender. 275/285, not so much.

 

one of the nice things of using the bat method is that form follows function.

this I did completely with a bat. the only thing the body shop did was fill in the unevenness no banging with a hammer. light bondo fill and I now can fit 335s on 11s with 20mm spacers. and the best part is the look that the 928 should have had ... In my opinion