-2.5 degree camber is ideal but does accelerate inner tire wear on the street. I would say -2 degrees is a happy medium. What I do is "flip" the fronts to get a little more out of the tires. PS4's are great street tires but not so good on track. They cycle out pretty quick. Tons of great 200tw tires out there that are far better than PS4's. Keep in mind PS4's are not track tires. From what I understand Michelin uses the softer/sticky compound on the top layer and as the tire wears down you get to a harder compound. PS4's will peel the outer edges with track use real quick. I recommend getting track tires with a stiff sidewall since the GSF is a hefty vehicle. As far as running square, I personally feel the car gets a better balance. You want to run wider tires in the front to counter some of the understeer (more grip). Lastly, running square allows you to swap the rears/fronts to get more use out of the tire. I like eighteens for track tires for the taller sidewalls which provides rolling resistance. This provides consistent tire contact area with the track, not to mention the larger option on tire brands/sizes and other track benefits. I feel 19 and larger tires provide aesthetics to a street car but negative performance on the track. I've seen folks bend wheels running 19, 20's on track because of the low profile sidewalls. Hitting the rumble strips the wrong way can cause and expensive damage. I run 18x10's and it clears the brake calipers no problem.

 

@SOCALGSF16

Great info!

Have you stuck with the RR UCAs? Why, just because of the fixed caster?
How do the Endless MX72 pads hold up, especially running the RT660s? You use them to/from the track and on track with success? I always thought that was very hard to do on a dual-purpose car (especially a heavy one).
What 18" wheels do you run?

 

Yes, I have stuck with my RR UCA. Fixed caster is a good feature but mainly because of the camber adjustment. I favor mfg’s that actually track their cars/products which is what RR does with all their products.
The Endless pads are awesome and they hold up real well on track. When at optimal temp., the initial bite, modulation and release is great. Yes, I use them to/from track and daily them with no issues/squeals. You get what you pay for as they say. I run Volk ZE40 18x10 | 35.

 

@SOCALGSF16 What offset do you recommend with the 18" square set up? Is that 35?

 

Yes, it is 35 offset

 

Unfortunately the track car I had before is dead and gone now, forcing me to promote my GSF to track duty in the interim. But I like the idea of driving to the track and then driving home afterwards, without the added logistical complexity of a truck and trailer setup.
I really appreciate you coming into give us this info.

 

Just wanted to give some feedback on the install process for rrracing upper control arm install.on my gsf. It was actually much easier to adjust that what I was thinking. I installed myself and After measuring the distance on the stock arm and knowing per rrracing 3 turns on the arm equals 1 degree. I used a piece of angle iron and a digital gage to measure the camber and I was able to get the camber where I wanted to be ( -1.9) pretty quickly and took to the shop for alignment after where they confirmed my camber and the shop ended up only adjusting the toe to nominal. The camber adjustment will cause the toe to change. The bolts are kind of difficult to get at but I quickly find way to get it in. I was worried that this was going to be supper difficult and it turned out to be not bad if you start at the stock length (see paper) and knowing initial camber amd 3 turns is 1 degrees. Today was supposed to be my track day but weather is crap. So I will try on a few weeks and provide feedback.

 

Any updates on this thread? Curious how DD with -1.9 camber was? I just started doing autocross with my GSF and rolled my PS4s big time. Really considering the FIGS upper arms and am curious if the -2 was noticeable. By increasing the negative camber in the front will I have issues with tire wear just from daily driving? All of this is new to me, so looking to learn more about this subject. Also was looking into chassis bracing which is a side comment.

 

The car performed much better with the -1.9 front camber on the track. Less understeer and more importantly the front tire held up much better. No shredding, faster and I was keeping up with some fast cars. With respect to daily driving no big change. I noticed the turn in was a little faster ( better). I did not notice any inner tire wear thus far. I am considering adding a little more camber if plan to do more track day. I think -2.3 to -2.5 would be good. I am looking at going to 18in wheel for track. Debating a 18x10 square vs 18x10 front and 18x11 rear. Has anyone on the forum run18x11 on the rear?

 

Thanks man! I will have to pull the trigger and get the upper arms then! I’ll run the -1.9 like you in the beginning and go from there. I plan on doing both eventually but in your opinion is it better to do the bracing first or the upper arms?

 

Camber, about -2 min should be the number one priority. I have not even thought about brace since imo there are more important items if tracking such as a dedicated set of track wheels. My brand new ps4s are pretty used up after one track day so dedicated wheels I feel is a must. Then after that would be rr racing coilovers and 2 pce rotors. Braces is far down the list as these other will provide noticeable improvements. I feel the gsf is already a stiff car. I am not saying the brace will not help, for me it is very low on my list. Maybe get feedback from @SOCALGSF16 or other as I believe he tracks his gsf

 

@Moos0004 I appreciate all of the feedback! I ended up just purchasing some FIGS upper arms, will have to update in thread once they are installed. Will be running them in -2. I have to scroll up in this thread for wheel & tire suggestions. I was looking into APEX rims, and maybe will eventually run a 18in set just for track/ autocross.

 

Post install, I can say the FIGS upper arms were one of the best purchases I have made for the car! -2 camber in the front seems to be sweet spot for daily driving and for using at autocross. I feel as though I have a lot less understeering now, and the car feels a lot more confident in the turns.