What Hot Tire Pressure? - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

gbgracer · 05-12-2013, 12:17 AM

CSG Mike,

I hear you and believe you are probably right but I haven't put a pyrometer to it yet. My hope was that between the Whiteline top hats, camber bolts, RCE Yellow springs, upgraded front and rear sway bars, it would be enough to track it aggressively but perhaps it isn't.

These changes gave me upgraded roll stiffness, higher spring rates and -2.3F and -2.1R camber. The next step is coilovers and camber plates which is a big expense...

RAWR BRZ · 05-12-2013, 01:35 AM

Stock alignment is your issue... and in depth, your camber. At stock alignment/camber my stock tire's michelin dude's head was rubbed off... Also run hot PSI around 35 all around and see how you like it from there. You will feel much more grip at 35 vs 40

sw20kosh · 05-12-2013, 02:03 AM

Quote:

Originally Posted by RAWR BRZ

Stock alignment is your issue... and in depth, your camber. At stock alignment/camber my stock tire's michelin dude's head was rubbed off... Also run hot PSI around 35 all around and see how you like it from there. You will feel much more grip at 35 vs 40

He's not on stock alignment.

hehe

He's got -2.3 up front so it is his driving style that is tearing up his sidewalls.

RAWR BRZ · 05-12-2013, 02:14 AM

Quote:

Originally Posted by sw20kosh

He's not on stock alignment.

hehe

He's got -2.3 up front so it is his driving style that is tearing up his sidewalls.

Oh woops... didn't catch that :P

donutfilling · 05-12-2013, 03:29 AM

Before putting the money into a sway bar, I'd invest it in a pyrometer.

gbgracer · 05-12-2013, 06:52 PM

So the update is that the bigger bar did help the take some of the uneven tire wear away. Still working the outer edges too much but not as bad. However, the car did pick up a little bit more push, still not too bad though unless I have a passenger with me and then the car pushes pretty badly...

Having said that the car still turned a faster lap then before so overall better! The real solution is more neg camber and higher spring rates but that's not a cheap solution...

Thanks for all the feedback though!

ayau · 05-12-2013, 07:00 PM

The problem might be the tires too. Maybe the Mich PSS have pretty soft sidewalls. Assuming you're still on stock 17x7 wheels, the sidewall may deform more than a 215 tire.

wparsons · 05-12-2013, 07:45 PM

If you want more camber up front and don't want camber plates just slot the upper knuckle hole on the struts. Some cars come like this stock, and Koni sold yellow struts pre-slotted on a bunch of platforms as well.

I bet with 3-3.5* up front you'll find it faster without the stiffer front bar.

gbgracer · 05-12-2013, 10:13 PM

wparsons

Thanks, I'll try that. I'm sure getting more of the front tire on the ground will make all the difference.

gbgracer · 05-12-2013, 10:14 PM

ayau

I have Motegi rims in 17 x 7.5 and 225/45 tires

rx3 · 05-14-2013, 05:47 AM

I ran 38 psi front and 36 psi rear on 235/40 Toyo R1-R and dealt with over-steer in about 30% of the turns (even in third gear) and never with any under-steer. Next time I'll switch to Toyo R888 and try 30 to 32 psi rear.
(A bystander told me that my car was swerving around like an old BMW 2002.)
All I did was installing the camber bolts in the front. I think the 20 mm swaybar should help.

One AutoX lasts 3 minutes here and all four runs are done within 30 - 45 minutes and I think the R1-R may have gotten too hot (it started to shred also). Most competitors were on Toyo R888.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
New Tire Pressure Monitoring Sensors?	Kochinopride	Wheels \| Tires \| Spacers \| Hub -- Sponsored by The Tire Rack	11	04-14-2013 08:51 PM
Tire Pressure Warning	pinoyplaya	Wheels \| Tires \| Spacers \| Hub -- Sponsored by The Tire Rack	7	12-21-2012 10:55 PM
Tire pressure of all-seasons	Scoob	Wheels \| Tires \| Spacers \| Hub -- Sponsored by The Tire Rack	8	11-12-2012 12:49 AM
Tire pressure warning on	sa1126	Wheels \| Tires \| Spacers \| Hub -- Sponsored by The Tire Rack	7	10-27-2012 08:26 PM
BEST TIRE PRESSURE TO RUN TRACK	karma003	Tracking / Autocross / HPDE / Drifting	13	10-24-2012 05:32 PM

05-12-2013, 12:17 AM	#15
gbgracer Member Join Date: Mar 2013 Drives: 2011 STI Location: Dallas Posts: 40 Thanks: 1 Thanked 9 Times in 6 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	CSG Mike, I hear you and believe you are probably right but I haven't put a pyrometer to it yet. My hope was that between the Whiteline top hats, camber bolts, RCE Yellow springs, upgraded front and rear sway bars, it would be enough to track it aggressively but perhaps it isn't. These changes gave me upgraded roll stiffness, higher spring rates and -2.3F and -2.1R camber. The next step is coilovers and camber plates which is a big expense...

05-12-2013, 01:35 AM	#16
RAWR BRZ Senior Member Join Date: Sep 2012 Drives: 2010 BMW M3, 2013 Subaru BRZ Location: Orange County Posts: 376 Thanks: 32 Thanked 97 Times in 56 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	Stock alignment is your issue... and in depth, your camber. At stock alignment/camber my stock tire's michelin dude's head was rubbed off... Also run hot PSI around 35 all around and see how you like it from there. You will feel much more grip at 35 vs 40

05-12-2013, 03:29 AM	#19
donutfilling Senior Member Join Date: Jul 2012 Drives: frs Location: LA Posts: 319 Thanks: 55 Thanked 75 Times in 45 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	Before putting the money into a sway bar, I'd invest it in a pyrometer.

05-12-2013, 06:52 PM	#20
gbgracer Member Join Date: Mar 2013 Drives: 2011 STI Location: Dallas Posts: 40 Thanks: 1 Thanked 9 Times in 6 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	So the update is that the bigger bar did help the take some of the uneven tire wear away. Still working the outer edges too much but not as bad. However, the car did pick up a little bit more push, still not too bad though unless I have a passenger with me and then the car pushes pretty badly... Having said that the car still turned a faster lap then before so overall better! The real solution is more neg camber and higher spring rates but that's not a cheap solution... Thanks for all the feedback though!

05-12-2013, 07:00 PM	#21
ayau Senior Member Join Date: Nov 2011 Drives: Some rust bucket Location: Polar ice cap Posts: 3,058 Thanks: 312 Thanked 1,045 Times in 556 Posts Mentioned: 37 Post(s) Tagged: 0 Thread(s)	The problem might be the tires too. Maybe the Mich PSS have pretty soft sidewalls. Assuming you're still on stock 17x7 wheels, the sidewall may deform more than a 215 tire.

05-12-2013, 10:13 PM	#23
gbgracer Member Join Date: Mar 2013 Drives: 2011 STI Location: Dallas Posts: 40 Thanks: 1 Thanked 9 Times in 6 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	wparsons Thanks, I'll try that. I'm sure getting more of the front tire on the ground will make all the difference.

05-12-2013, 10:14 PM	#24
gbgracer Member Join Date: Mar 2013 Drives: 2011 STI Location: Dallas Posts: 40 Thanks: 1 Thanked 9 Times in 6 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	ayau I have Motegi rims in 17 x 7.5 and 225/45 tires

05-14-2013, 05:47 AM	#25
rx3 Senior Member Join Date: Mar 2013 Drives: BRZ Location: Europe Posts: 350 Thanks: 53 Thanked 114 Times in 71 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	I ran 38 psi front and 36 psi rear on 235/40 Toyo R1-R and dealt with over-steer in about 30% of the turns (even in third gear) and never with any under-steer. Next time I'll switch to Toyo R888 and try 30 to 32 psi rear. (A bystander told me that my car was swerving around like an old BMW 2002.) All I did was installing the camber bolts in the front. I think the 20 mm swaybar should help. One AutoX lasts 3 minutes here and all four runs are done within 30 - 45 minutes and I think the R1-R may have gotten too hot (it started to shred also). Most competitors were on Toyo R888.

User Name		Remember Me?
Password