[CRBWS6]

To the SLE guys running Falken in B-Street, am I reading correctly that the go-to size is F: 275/30/19 and R: 305/30/19?

[apexit53]

Originally Posted by CRBWS6

To the SLE guys running Falken in B-Street, am I reading correctly that the go-to size is F: 275/30/19 and R: 305/30/19?

Ive seen some do the 305 square setup. I run 275/305. I like the feel of this.

[Msquared]

Originally Posted by CRBWS6

To the SLE guys running Falken in B-Street, am I reading correctly that the go-to size is F: 275/30/19 and R: 305/30/19?

I agree with Mike: this is by far the most popular fitment and it feels great. Instead of a square setup, I'd suggest that the other interesting option is the 305 up front and 315 in back. That will help the tires both handle more close to each other (comparing front and rear) since they'll be a little closer on "pinch" factor. I was going to try that but chickened out. A friend of mine in Salt Lake City is trying them. My guess is the feel is different but the ultimate speed potential is very similar. There's a small chance that the ABS would be happier with the 305/315 combo and would hit ice mode less often, but that's just wild speculation. It would be fun to do a Hollis/Whitener-style test of both fitments, but I don't have the skill/consistency or funds!

[Scargoes]

Originally Posted by Msquared

Agreed, and it is definitely the stock eLSD calibration causing this. The autocross reflash is supposed to fix it, but make sure it's legal for your class first (it isn't in Street class for SCCA). Also, IME tires that hook better than the stock GYs in a straight line help a lot. The Falken RT660 mitigates the oversteer to the point where I don't even notice it anymore.

I have the alternate eLSD tune and I still get this problem with the nannys off. I am currently at 0.12* total toe in in the rear. I used to be at 0.10* and it was worse. I will be trying more rear toe before the next event.

As for tires, the do help. But in my experience, even the RT660 lack forward bite. Of the tires I have used, the rivals(when warm) and the CR-1s have been the two with the best bite out of a corner.

[VR Baron]

Originally Posted by Scargoes

I have the alternate eLSD tune and I still get this problem with the nannys off. I am currently at 0.12* total toe in in the rear. I used to be at 0.10* and it was worse. I will be trying more rear toe before the next event.

As for tires, the do help. But in my experience, even the RT660 lack forward bite. Of the tires I have used, the rivals(when warm) and the CR-1s have been the two with the best bite out of a corner.

Good to know on tune. I use .125 toe as well. I may go more when I see how alignment is doing. I will say the hotchkiss front bar on soft helps with the rear wag. It happens, but rear snaps right back on its own, worst case a tiny bit of counter steer.

[CRBWS6]

Originally Posted by Msquared

I agree with Mike: this is by far the most popular fitment and it feels great. Instead of a square setup, I'd suggest that the other interesting option is the 305 up front and 315 in back. That will help the tires both handle more close to each other (comparing front and rear) since they'll be a little closer on "pinch" factor. I was going to try that but chickened out. A friend of mine in Salt Lake City is trying them. My guess is the feel is different but the ultimate speed potential is very similar. There's a small chance that the ABS would be happier with the 305/315 combo and would hit ice mode less often, but that's just wild speculation. It would be fun to do a Hollis/Whitener-style test of both fitments, but I don't have the skill/consistency or funds!

Thanks for clarifying. I am leaning toward the 275/305 on MRR M716's (ZLE reps). Although the OEM SC3 have been great in hot summer temps, I didn't enjoy them at winter events in Run Group A.

Although not exactly the same, I have the following feedback per size testing on a B-Street SLE (national champ driver) as follows:

1. OEM size SC3
2. 305/30/19 & 325/30/19 SC3

OEM was faster. The comments were that the lack of diameter delta may have caused the car to behave strangely (not sure if it was ABS or eLSD issues?). The other potential issue was TPC spec compound vs. non-TPC for the 19's.

[apexit53]

a lot of it comes down to what you're most comfortable in and what will make yo confident and fast. For me I like feel, going wider doesn't help my butt lol. Some people that works. There is no one setup to have. I would love to test the 305/315 but, I spend enough as it is. too late in the season to change now

[Msquared]

Originally Posted by CRBWS6

Thanks for clarifying. I am leaning toward the 275/305 on MRR M716's (ZLE reps).

FWIW, that's exactly the combo I'm running, including the wheels. The rears have 38mm offset, which is 5mm less than stock - they sit 5mm further out and that's no problem at all. The fronts have 23mm offset, which is 3mm more (to the inside) that stock. To be safe on inside clearance (especially when I thought I was going to run 305s up front), and also to take advantage of a bit more track width, I installed the longer truck studs and I'm running 5mm spacers up front. It works well. The rules in SCCA Street classes allow +/- 7mm offset from stock, so I could actually run 10mm spacers up front if I wanted. I just haven't seen a reason yet to go that far.

[rotis]

Originally Posted by CRBWS6

1. OEM size SC3
2. 315/30/19 & 325/30/19 SC3

To clarify, was this-

1. 285/30-20 on 20x10 and 305/30-20 on 20x11

2. 305/30-19 on 19x10 and 325/30-19 on 19x11

If that's the case, I think I would expect the OEM sizes to be faster also.

[MatthewAMEL]

Originally Posted by Scargoes

I have the alternate eLSD tune and I still get this problem with the nannys off. I am currently at 0.12* total toe in in the rear. I used to be at 0.10* and it was worse. I will be trying more rear toe before the next event.

As for tires, the do help. But in my experience, even the RT660 lack forward bite. Of the tires I have used, the rivals(when warm) and the CR-1s have been the two with the best bite out of a corner.

I have the eLSD tune also.


The two things that helped me the most are the .125 rear toe and the solid rear cradle bushings.


I have noticed a big difference in feel/performance at AutoX and Track on corner exit with those two changes.

[VR Baron]

Originally Posted by MatthewAMEL

I have the eLSD tune also.


The two things that helped me the most are the .125 rear toe and the solid rear cradle bushings.


I have noticed a big difference in feel/performance at AutoX and Track on corner exit with those two changes.

Did the EDiff tune help much? Not that I can get one in my area as of now.
And whose cradle bushings?

[CRBWS6]

Originally Posted by Msquared

FWIW, that's exactly the combo I'm running, including the wheels. The rears have 38mm offset, which is 5mm less than stock - they sit 5mm further out and that's no problem at all. The fronts have 23mm offset, which is 3mm more (to the inside) that stock. To be safe on inside clearance (especially when I thought I was going to run 305s up front), and also to take advantage of a bit more track width, I installed the longer truck studs and I'm running 5mm spacers up front. It works well. The rules in SCCA Street classes allow +/- 7mm offset from stock, so I could actually run 10mm spacers up front if I wanted. I just haven't seen a reason yet to go that far.

Thanks for validating the offset fitment. I assume the 275/30 would clear w/o spacers.
Do you still get ICE mode with this combo, or has that settled down with practice? I have not experienced ABS related issues on the OEM tires at AutoX or on the track fortunately....and I am a very thrashy driver!

BTW - found additional your's and others good info on the Falkens/sizing here too: https://www.camaro6.com/forums/showt...=584979&page=8

[CRBWS6]

Originally Posted by rotis

To clarify, was this-

1. 285/30-20 on 20x10 and 305/30-20 on 20x11

2. 305/30-19 on 19x10 and 325/30-19 on 19x11

If that's the case, I think I would expect the OEM sizes to be faster also.

Yes and Yes. Thanks for catching the typo on #2. Post has been edited.

[Msquared]

Originally Posted by CRBWS6

Thanks for validating the offset fitment. I assume the 275/30 would clear w/o spacers.
Do you still get ICE mode with this combo, or has that settled down with practice? I have not experienced ABS related issues on the OEM tires at AutoX or on the track fortunately....and I am a very thrashy driver!

I never got ice mode on the stock GYs. It can be avoided with a more gradual touch on brake application. That's not my strong suit, so I have to really work on it.