GT345

I find this hard to believe, and here is the reason why.

On a GT3 they come stock with 20s so going down to 19s is one inch on both front and back.

On a GT3RS they come stock with 20s in the front and 21s in the rear so your only going down one inch in the front but 2 in the back.

So using the same configuration with 265/35/19 and 325/30/19 wont work since you will need a back tire with a larger profile to be closer to stock stagger and ratio.

I am willing to bet that your RS friends are turning off TC to be able to use these tires without TC issues.

If you could confirm, that would be very helpful.

GT345

The 295 will fit, but if you have to turn more then 360 degrees it will rub.

Also if you run the 295/345 combo, I can guarantee you will have TC issues.

Not sure the ratio but the stagger is better with the 235s in the front and 345s in the rear, but I am willing to bet you are going to have serious understeer problems, but maybe changing up the sway bars to soft in the front might help.

The stock stagger on the RS is 1.4, with the 235/345 setup the stagger is pretty close at 1.2, with the 265/315 setup (both 35 profile) the stagger was 1.1 with a ratio of 1.053 (stock is 1.051), and I ran into some TC issues but not nearly as bad as the 265/345 setup.

Also the stagger on the 295/30/19 - 345/30/19 setup has a stagger of .7, but a ratio of 1.041.

There is one more set of tires that might also work which are the Pirelli P-Zero slicks.

They make a 275/675/19 and a 325/705/19 which is a 1.18 stagger that is better then what I was running

What size width did you order on your 19s?

The 295s require a 10 inch rim.

Spyerx

Out of curiosity, why the Hoosiers? I mean, I know why... but you car is easily sub 2 at chuckwalla bone stock off the showroom floor. Getting it there on the mpsc2 consistently then jumping to a hoho and running without tc (chuckwalla is a fantastic track for this, you get lots of space and lots of corners to control on slip,angle) would seem more prudent. The endless chase of laptimes starts with the driver. I’m barely sub 2 at chuck in my 997 on nt01 and there are at least a couple few more seconds there. Btw, chuck is seriously hard on tires as you are finding out. But that crack addiction from the sniff of slicks and Hoosiers is strong...

TRAKCAR

295 will fit - but not recommended for those reasons - agreed, thanks for clarifying.
I think size is 9 and 12.5" Forgelines.

TRAKCAR

In my case anyway:

The nose can go down for front grip, allowing more adjustments in setup to suit the drivers preferences.

Cost per set and I think they will maybe last longer then the MPSC2 as they respond to more Camber. Also more consistent from lap 2 through the end of the session where MPSC2 go off over a second after lap 4.

GT345

I understand your philosophy but when you can take 6 seconds off your time going from SC2 to Hoosiers then you will know why.

Just looking to figure out how to do it on the RS without the TC issues.

I waited over a year to do this, so I believe I am ready for it.

porscheflat6

I am running 19" 265/325 R7's and loving it

GT345

I have 9.5 fronts 12 rears.

The 295 Hoosier requires a 10" minimum front.

The 275 Pirelli requires a 9.5" to 11" in the front.

The 265 Hooiser requires a 9" to 10" in the front.

The 235 Hooiser requires a 8" to 9.5" in the front.

So with your 9" front you can run all but the 295 Hoosiers or the 275 Pirelli, also keep in mind going with a smaller width rim will make the spread of the tire a little smaller.

Is it to late to change your fronts to 9.5?

GT345

The Hoosiers do the same, the first session is just amazing, but it drops right away after that.

You are lucky if you get 2 weekends out of it, most likely you will only get one weekend out of them

People do claim that the slicks lasts a weekend longer then the Hoosiers, but those do cost more so it comes roughly to the same.

GT345

On what car?

GT345

You might be on to something here... Was looking at revolutions of tires and this is a 37 difference compared to stock which is 40 so pretty close.

I been running what has been recommended for me and it has gotten better but still not 100% and I was running a 31 difference last time I was out to track, first time was 18.

Found a website that had all the tire revolutions already setup for the Hoosiers and SC2.

Also the 235 are only .2 difference in tread width so not to much, so might not cause as much understeer as i originally thought and can always play with the sway bars if needed.

Will probably get a set for my event coming up in a couple weeks since I also have the original 345s ready to go with only 3 sessions on them so I will let you know.

GT345

New update for you...

Ran the 235/345 setup today for the last 2 sessions at Buttonwillow and things working pretty good.

Tomorrow will be the true test as for some reason I have had success with the other sizes but got progressively worse after each session.

I will say I feel pretty good about it so far, the car feels really good and there has been no signs so far of any TC issue.

GT345

I can officially say the 235 up front with either the 325 or 345 in the back will work without TC issues.

Here is a video of me using this setup at Buttonwillow.

GT345

Did you try out the Hoosiers yet??

TRAKCAR