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hey guys/gals, as some of you know i finally got my 928 purchase done, 90GT, i am now looking for new wheels, 17 or 18 preferably. if you have after market wheels plz post them on your car so i can have a visual, size and makes/offsets would be great, where you bought them would be great as well
hey guys/gals, as some of you know i finally got my 928 purchase done, 90GT, i am now looking for new wheels, 17 or 18 preferably. if you have after market wheels plz post them on your car so i can have a visual, size and makes/offsets would be great, where you bought them would be great as well
This post (#1303) in the aforementioned thread, RUF Speedline, 8.5 x 18 ET61 fronts and 9.5 x 18 ET48 rears, found on eBay painted black with a red rim (as ghastly as it sounds) and had them refinished.
Just bought these from germany but have not tried them on yet, i will have to wait until summer arrives.
The rear wheel has a bigger offset. I will run 235 in the front and 275 on the rear.
Stock 928's (especially later model versions) tend to understeer, under higher speed conditions (above normal street speeds....but not "crazy fast".) This can especially be an issue when experiencing other than completely dry conditions.
Increased horsepower output will greatly increase the amount of on throttle understeer.....dramatically.
While it is possible to install much wider wheels and tires on the rear of a 928 versus what one can install on the front, doing this obviously increases the amount of rear "stick" versus what improvement can be made in "front stick".
The result is a dramatic increase in understeer.
While it is cool to make 928's look better, for me it is important to not ruin the good qualities that are inherent in the 928.
In what I do for my clients, I always make sure that form doesn't ruin function.
This post (#1303) in the aforementioned thread, RUF Speedline, 8.5 x 18 ET61 fronts and 9.5 x 18 ET48 rears, found on eBay painted black with a red rim (as ghastly as it sounds) and had them refinished.
I had a set of those on my 85. Got them for $500 back in 2010. Sure wish I had kept them.
Stock 928's (especially later model versions) tend to understeer, under higher speed conditions (above normal street speeds....but not "crazy fast".) This can especially be an issue when experiencing other than completely dry conditions.
Increased horsepower output will greatly increase the amount of on throttle understeer.....dramatically.
While it is possible to install much wider wheels and tires on the rear of a 928 versus what one can install on the front, doing this obviously increases the amount of rear "stick" versus what improvement can be made in "front stick".
The result is a dramatic increase in understeer.
While it is cool to make 928's look better, for me it is important to not ruin the good qualities that are inherent in the 928.
In what I do for my clients, I always make sure that form doesn't ruin function.
Choose wisely.
Gregg I completely agree in my limited track experience sensed the same thing. I’m curious what width and offset front wheels you’d recommend with appropriately width rears. Would you recommend 8”, 8.5”, 9”?
Gregg I completely agree in my limited track experience sensed the same thing. I’m curious what width and offset front wheels you’d recommend with appropriately width rears. Would you recommend 8”, 8.5”, 9”?
Of all the available 18" wheels, I've always liked Jim Corenman's wheels the best.
For some reason, they don't look too big for the wheel arch, to me. And they aren't too modern looking for a 928. For some reason, they just don't look like 18's. (Stick a 18" phone dial on a 928 and it looks like you put on 20's!)
And I think that the widths and tire size fall really close to the perfect sizes. (Maximum of a 275 on the rear with a 245 on the front.)
Once you get into the 295, 305.or 335 rear widths, there's simply not enough room for a matching front tire. (These cars are not 911's with most of the weight hanging in the rear.)
And softer front sway bars are tough to find (although they do exist.)
The "Full Monte" of terrible suspension/wheels and tires exists, out there: (And yes, I know that I'm about to step on some people's very fragile toes.)
1. Eibach aftermarket progressive springs, for which there isn't a shock made (other than a custom double/triple adjustable JRZ, a Moton, or an Ohlin) that has anywhere near the proper compression or rebound to deal with the spring rate of those springs.
2. Heavy large wheels, increasing the unsprung weight, without a shock valved to control the additional weight.
3. Larger front sway bar....several manufacturers made these. What a terrible idea this was...making a larger sway bar for a car that already understeers. (What needed to be built was a larger rear bar....but since the rear bar is almost impossible to remove with the transmission in place, no one ever wanted to bother doing the correct thing....sell them what they think they need, not what they really need!)
4. Increasing limited slip percentage by adding in an early limited slip....or adding/keeping even the stock "snow" limited slip with the above combinations.
5. 10.5" or 11.0" rear wheels with 295-335 rear tires.
These are the 928's that you see parked under the underpass waiting for the rain to quit falling.
Proving it is possible to turn one of the greatest GT cars ever made into junk.
When I bought my S4 it already had 18" Twists fitted with 295 rear tires. I felt that the car had too much tire and wheel, so sold them and then went to 17" and 265 rear tires,
When I bought my S4 it already had 18" Twists fitted with 295 rear tires. I felt that the car had too much tire and wheel, so sold them and then went to 17" and 265 rear tires,
Before:
Now, fitted with 17" OZ Mitos:
Wow!
Great looking car with great looking period correct wheels.
And I can see your red frame rails in front and in back of the front tires.
You've done a bit of detailing.....
when you say 17 is better handling do you mean if pushed on a track or just everyday driving, sometimes spirited. im not taking this car to a track is why i ask, thanks
I am referring to street use. I do not track my 928. Those are different parameters. I just notice less stability in cornering in spirited driving with the 18's. I had 16 phone dials, 16 flat dish, 17 Cup 1's on my various sharks. The 18 C3's are the least of the bunch from a performance standppoint. I like how they look, but I do not like how they handle for street use. I am running good tires too - Michelin SS's
I was planning on 235 front, 265 rear, but the percentage increases in contact patch would exacerbate understeer, whereas 245 front would mean a higher increase in front grip relative to rear over stock. I was browsing Cup II's randomly yesterday and spotted ET70 17x8 fronts, so its doable with 17's as well.
I've got some 5-spoke panamera wheels (8x18 ET59 front, 9x18 rear) which will be my next set of wheels on the 89 while I get the Cup II's on it refurbed (and hunt down some genuine rears instead of the Mille Miglia rears I inherited from a PO.. at least my fronts are genuine GTS ones). Looks like I need to see if 245 fronts will fit without rubbing.
01-06-2021, 02:16 PM
