I got the wheels from Finspeed in ~3 weeks with ground shipping.
Wheels specs: 18X12 and 18X13
Tire Specs: 335/30/18 and 345/35/18 Hoosier A7s
Front weights 50.1 lbs (new tire) vs. 52.2 lbs (new tire) —> 4.2lbs saved
Rear weights 52.8 lbs (new tire) vs. 65 lbs (half worn stock) —> 24.4 lbs saved
Total weight savings of 28.6 lbs rotating/unsuspended mass
Front tread width increase of 1 5/8" per side --> total of 3 1/4" tread width increase
Rear tread width increase of 1/4" per side --> total of 1/2" tread width increase
Total width of 3.75” gain
So — lost 28.6 lbs of rotating/unsprung weight and picked up a bunch of grip. Went out and test drove on roads last night, and feels great. Since the additional width was primarily added inboard in the front, the tracking is still excellent. No rubbing anywhere while driving., but I have not pushed it hard, and the ride height is now 5/16” higher in the front and .4” lower in rear (4 5/16” Front and 5.1” rear). I will likely bring the front down, but it is nice to be able to go back to the stock wheels without having the front be too low.
In checking Front wheel fitment — The front wheels clear at full lock everywhere, except at full droop, where the tire can brush the lowest point of the fender where my gravel protector is (pic attached). If you mount the wheel weights on the outer edge of the wheel barrel, this can nock the A-Arm brake duct at full lock. Just don't put the wheel weight right there when balancing... I spent a lot of time measuring the front to come up with the specs for the 18X12. 8 5/8" backspacing is where it needs to be for a 12" wheel.
In checking Rear wheel fitment — Everything clears fine, but the inside wheel weights need to be positioned halfway across the inner barrel to avoid hitting e-brake cable, or you can Loosen the bolt and pivot it a bit (there is a range available where the set tab is in the upright hole) which gives plenty of clearance.
Car has -2.9 camber front with 1/8" total toe out (face of tire). Rear is -1.7 with 3/8" total toe in (face of tire).
Ride heights are 3 7/8" front and 5 3/8" rear.
Rear wing is currently at position 2.
Shock settings:
For AutoX I have been running 7 or 8 on rebound on the front and taking out a click or 2 of compression. This (added rebound damping) really helped turn in, and slaloms. Will try factory compression (7 bump with 7 rebound next time out). On the rear I have been running the factory recommended, but will likely try upping rebound there too.
I have attached some pictures showing the closest rub point in fender at full lock/droop (very unlikely to ever actually occur while driving), how the top of the tire is still tucked in plenty, and a pic of where the wheel weight grazes the extra brake ducts.
Attachment 18995Attachment 18997Attachment 18998Attachment 18999
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