Most aggressive wheel/tire track setup

[sc_tr0jan_m3]

Here's the only reference I could find on this setup:
https://www.flickr.com/photos/apexraceparts/50173173338

that car had to have a TON of body work to fit those wheels. the fenders are NOT stock.

[BBRTuning]

I've run both my street/canyon setup (18x10.5 +22, 275/35-18 Rival S 1.5 square) and dedicated track setup (18x10 +25, 275/35-18 NT01 square) without rubbing although the 10.5 +22 setup did take quite a bit more work. Fenders are rolled/flared and pulled out a bit. I have only 3mm clearance on the inside to the strut so I couldn't run a higher offset if I wanted.

From tire pyrometer data I've found that my car needs about 3.8-4.0* front camber (on NT01) to see good temperature spread (~10* spread from outer to inner). I ran 3.5* at Laguna earlier this month and saw about 15* hotter on the front outsides, which is significant considering that track has a lot of fast straightaways. The point being, 3.5*+ front camber for track setup is expected and not simply a compromise to make the tires fit.

I'll eventually change to 10.5" for the track set too. The typical R-compount "275" width tire is too wide for a 10" wheel, IMO. These cars are heavy and we need as much support for the sidewall as we can get. Especially in the case of the NT01 which already has a pretty weak sidewall.

[silaciM3]

Well, certainly not going to compromise or run crazy camber just to fit more rubber. Looking to get more function here from the wider setup (increased track width/decreased weight transfer, wider tires, etc).

Optimal front camber would have to remain around -3 to 3.5 based on my pyrometer data, or whatever the new setup dictates (should be a tad more).

Spring perch is above the tire, it’s the strut body that will require an ET20 with 11” wheels, no way around that. Rears should fit with ET30. My main concern is front fender clearance.

[Fresh1179]

It depends how much you're willing to compromise running larger tires and/or optimal camber. :P

ET25 is already compromised IMO. ET 35 with a 10mm spacer in the rear is the functionally optimal setup, IMO, if your spring perch is above your tire.

I run ET35 with a 10mm spacer in the rear and 275 squares. -3 degrees of front camber. What suspension do you have installed?


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[Obioban]

It depends how much you're willing to compromise running larger tires and/or optimal camber. :P

ET25 is already compromised IMO. ET 35 with a 10mm spacer in the rear is the functionally optimal setup, IMO, if your spring perch is above your tire.

[silaciM3]

What's the most aggressive wheel/tire combo have you guys been able to run at the track?
I'm currently on square 18x10 wheels with wide 265 R compound tires. Effective ET F+30 R+25

I know that some have run square 18x10.5 ET25 all around, but I'm wondering if anyone was able to pull off 18x11.

These M4 GT4 wheels are what triggered this whole dilemma:
https://www.bimmerworld.com/Wheels-T...8x11-ET30.html

Front ET would have to be brought down to +20 to clear the strut. Rears should be OK as is.
Would probably require some fender work even with race alignment?

Here's the only reference I could find on this setup:

https://www.flickr.com/photos/apexraceparts/50173173338