(2015) 200+ Treadwear Autocross Street Tire Thread - Page 29 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

SeanRTR · 05-21-2015, 11:15 AM

That may true, but these tires don't need additional heat to operate. If it's 50+ degrees F outside, they're going to be fine. I get the decreased contact patch to generate heat theory, but this is autocross, not road racing. Our tires have tread, and are designed to operate in the cool -warm temperature range.

MTeator · 05-21-2015, 12:01 PM

Quote:

Originally Posted by SeanRTR

31 dry
25 wet

Apologize if I missed this, but is this the 245's in CS?

SeanRTR · 05-21-2015, 12:11 PM

Quote:

Originally Posted by MTeator

Apologize if I missed this, but is this the 245's in CS?

I bought the 235-45-17's But, the same #'s should apply. In CS, the 245/40's are going to be up against the limiter on national courses, so I went with the tall tires...and my car is turtle slow in a straight line now.

MTeator · 05-21-2015, 12:20 PM

Thanks, wasn't sure how the 245's RE71's were working out on 7" rims, I've been a little not paying attention this year.

Laloosh · 05-21-2015, 01:36 PM

Quote:

Originally Posted by MTeator

Thanks, wasn't sure how the 245's RE71's were working out on 7" rims, I've been a little not paying attention this year.

I run 245/40/17 RE71's and would advise against running 31 psi on the front. IMO you need at least 34-35 hot and you are still going to roll over to the triangles. In the rear I run 31 and its perfect.

Biggins · 05-21-2015, 01:48 PM

Quote:

Originally Posted by MTeator

Apologize if I missed this, but is this the 245's in CS?

Quote:

Originally Posted by SeanRTR

I bought the 235-45-17's But, the same #'s should apply. In CS, the 245/40's are going to be up against the limiter on national courses, so I went with the tall tires...and my car is turtle slow in a straight line now.

I'm running 225/45/17 right now in CS and am nowhere close to the triangles at 31. I had 235/45 RS-3s last year and ran the same pressures. I have needed 3rd gear more this year with the 225s though.

MTeator · 05-21-2015, 02:11 PM

Quote:

Originally Posted by Biggins

I'm running 225/45/17 right now in CS and am nowhere close to the triangles at 31. I had 235/45 RS-3s last year and ran the same pressures. I have needed 3rd gear more this year with the 225s though.

Are you on concrete?

Biggins · 05-21-2015, 02:33 PM

Quote:

Originally Posted by MTeator

Are you on concrete?

Only when I go to Lincoln (or maybe Toledo this year)... all of my local sites are pretty big but all sealed asphalt. The east coast does not do concrete for their parking lots and the airports are too busy.

MTeator · 05-21-2015, 03:00 PM

Quote:

Originally Posted by Biggins

Only when I go to Lincoln (or maybe Toledo this year)... all of my local sites are pretty big but all sealed asphalt. The east coast does not do concrete for their parking lots and the airports are too busy.

Thanks, just understanding what you're running on an adjusting tire pressures for. I'm still on older Rivals but we have Wilmington close and oh so grip. Soon as I wear these out going bridgestones.

My local local lots are sealed asphalt as well.

SeanRTR · 05-21-2015, 03:01 PM

31 PSI on concrete 235 45 17, no where near the triangles up front. I may try even lower pressures:
Last weekend Toledo Express, 8th or something on pax, 180 cars
[ame="https://www.youtube.com/watch?v=lutRPBSUbbQ"]Sean Grogan 5 17 15 Nwor express airport Scion Fr-S - YouTube[/ame]

Jawnathin · 05-21-2015, 03:04 PM

Quote:

Originally Posted by Laloosh

I run 245/40/17 RE71's and would advise against running 31 psi on the front. IMO you need at least 34-35 hot and you are still going to roll over to the triangles. In the rear I run 31 and its perfect.

My experience is the same.

Maybe a 235/45 or a wider STX wheel doesn't need as much pressure, but I need 37 PSI up front on my 245/40 7" wheel setup to not rollover past the triangles.

Locust · 05-21-2015, 03:55 PM

I guess I should have specified that I'm running 225/45/17 on the OEM wheels. It seems like the 245/40 and 225/45 have a non-negligible difference in PSI settings.

Wheeljack · 05-21-2015, 06:39 PM

Since the weather is getting hotter, where is everyone at on the necessity of a water sprayer on the current crop of tires? I used it on my old Z2s with great effect, but I'm not sure if I need it on the V2 RS3s. I ran rivals on my S2000, and those tires seemed to like heat. Any thoughts on the RE71s or Rival S?

48Spoons · 05-21-2015, 10:44 PM

The RE71s do pretty well in the heat, but definitely like being cool in my experince. Ran them with a co-driver at an event and we were double spraying and it made a world of difference. Though don't seem to need as much spraying as the previous ZIIs did. As it warms up more (I'm in NE) we'll see how it goes.

05-21-2015, 12:20 PM	#396
MTeator First 86 Join Date: May 2012 Drives: 2013 Scion FR-S Location: Lexington, KY Posts: 303 Thanks: 14 Thanked 98 Times in 56 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Thanks, wasn't sure how the 245's RE71's were working out on 7" rims, I've been a little not paying attention this year. __________________ Scion First 86 in Lexington KY - Firestorm 6MT - Delivered May 17, 2012 Mods: Motegi 17x7 TrakLites, BFG Rivals, K&N 33-2300 Filter, Nameless Perf. Track Pipe, TRD springs & rear bar, Hotchkis front bar (eh), Kask trailer hitch

05-21-2015, 03:55 PM	#404
Locust Custom User Title Join Date: Oct 2014 Drives: 2015 Scion FR-S, 2012 OB Evo X MR Location: Seattle Posts: 807 Thanks: 13 Thanked 424 Times in 272 Posts Mentioned: 13 Post(s) Tagged: 2 Thread(s)	I guess I should have specified that I'm running 225/45/17 on the OEM wheels. It seems like the 245/40 and 225/45 have a non-negligible difference in PSI settings. __________________ LOCUST 2015 FR-S (STX) and 2012 Evo X MR Instagram: LocustAutoX Sponsors:DSGPerformance Drift Office Evil Apex Racing

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Wheeljack Member Join Date: Aug 2013 Drives: 2013 WRB BRZ Limited Location: Virginia Posts: 47 Thanks: 8 Thanked 17 Times in 9 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Since the weather is getting hotter, where is everyone at on the necessity of a water sprayer on the current crop of tires? I used it on my old Z2s with great effect, but I'm not sure if I need it on the V2 RS3s. I ran rivals on my S2000, and those tires seemed to like heat. Any thoughts on the RE71s or Rival S?

05-21-2015, 10:44 PM	#406
48Spoons Member Join Date: Mar 2013 Drives: Ultramarine FR-S Location: Boston, MA Posts: 73 Thanks: 9 Thanked 23 Times in 19 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	The RE71s do pretty well in the heat, but definitely like being cool in my experince. Ran them with a co-driver at an event and we were double spraying and it made a world of difference. Though don't seem to need as much spraying as the previous ZIIs did. As it warms up more (I'm in NE) we'll see how it goes.

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