Who's Running 235/40-18's in Front? Any Issues?
08-12-2008, 11:14 AM
#2
Rennlist Member
I am running them in MPS2's and although I was not aware of it until I removed my front wheels this past weekend i have the slightest rubbing against the front inner shield apparently only when I make hard turns at slow speeds. Nothing I am concerned over and it is not doing any damage other than making a shinny spot on the plastic shield.
08-12-2008, 06:54 PM
#4
Rennlist Member
Thread Starter
Hmmmm.....I'm running Sumitomo tires in said size. They are rubbing a lot 
They rub the front of the wheelhouse hard and on the opposite wheel they catch that lip at the rear of the wheelhouse near the trim cover.
They rub the front of the wheelhouse hard and on the opposite wheel they catch that lip at the rear of the wheelhouse near the trim cover.
08-12-2008, 11:03 PM
#6
Rennlist Member
Thread Starter
1) check and make sure that the bump stops are intact Not Done
2) roll the fender lips Done but won't help since the tires are rubbing the wheelhouse, not the lips
3) raise the car if it has been lowered (too far) Done
2) roll the fender lips Done but won't help since the tires are rubbing the wheelhouse, not the lips
3) raise the car if it has been lowered (too far) Done
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08-13-2008, 10:40 AM
#8
Rennlist Member
What is the rolling Dia of the Sumitomo? the MPS2's are 25.4" I also run a little negative camber.
I am confused. I thought the turbos came with rolled fenders. At least mine are rolled front and rear from the factory. My car is also pretty low.
I am confused. I thought the turbos came with rolled fenders. At least mine are rolled front and rear from the factory. My car is also pretty low.
08-13-2008, 11:05 AM
#9
Burning Brakes
I had this exact problem with rubbing on the forward side of the fender liner - bad bump stops were the culprit. So my $ is on bump stops are shot - ripped, torn apart or even missing.
Good news is that these are really cheap parts ... bad news is that you have to disassemble the shocks to replace them then realign the car etc.. ...
If you replace them you might raise the car a bit (again) for good measure (that is if you can without making it look like a truck - aka 'standard Porsche ride height'). "It is better to look good than to feel good" .. Fernando Lamas
Good news is that these are really cheap parts ... bad news is that you have to disassemble the shocks to replace them then realign the car etc.. ...
If you replace them you might raise the car a bit (again) for good measure (that is if you can without making it look like a truck - aka 'standard Porsche ride height'). "It is better to look good than to feel good" .. Fernando Lamas
08-13-2008, 02:44 PM
#10
More camber only helps in the rear. The fronts the limiting factor as mentioned here is not the fender but the fender liners during full turn. With that said we need to pay attention to wheel offset and rim width (along with the stops).
A while back I made a post about the "widest wheels" that might be useful. Jim Fikse measured used a 91 Turbo to come up with some numbers (try searching under my user name to find the post).
A while back I made a post about the "widest wheels" that might be useful. Jim Fikse measured used a 91 Turbo to come up with some numbers (try searching under my user name to find the post).
08-13-2008, 07:30 PM
#11
Rennlist Member
Thread Starter
I'm thinking I might be missing the "steering angle limitation" part no. 964 347 325 00. It's under the rack boot so I have to look to see if I have them.
The Sumitomo 235/40/18 has a 25.4 inch diameter according to Tire Rack.
I'm not sure I understand how bump rubbers would limit steering angle but the PO put new shocks on the car two years ago. They could be missing, however.
My car did not have rolled lips in the front. As for the rears, there were no lips.
The Sumitomo 235/40/18 has a 25.4 inch diameter according to Tire Rack.
I'm not sure I understand how bump rubbers would limit steering angle but the PO put new shocks on the car two years ago. They could be missing, however.
My car did not have rolled lips in the front. As for the rears, there were no lips.
08-14-2008, 10:44 PM
#13
Rennlist Member
Thread Starter
+1 on the bump rubbers.
Turns out that Porsche put a thicker steering stop on the '92 and beyond cars (964 347 325 02) to handle bigger wheels. This could be why Cobalt has minimal rubbing.
Looks like I'll be replacing steering stops in the near future.
Turns out that Porsche put a thicker steering stop on the '92 and beyond cars (964 347 325 02) to handle bigger wheels. This could be why Cobalt has minimal rubbing.
Looks like I'll be replacing steering stops in the near future.
