Tire Pressure for autocross - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

cmack · 02-15-2018, 03:36 PM

I was wondering If I can get some advise on tire pressure for autocross. Pressure but not tires

I do not yet have spare wheels for different tire setup.

Sunday 2/18 first autocross for 2018. It might be important to know I am not very good at autox.
Last autocross was mid summer in Texas. Not knowing any better I just filled tires to 35 in am and left it there. Afternoon was well above 100 degrees and it did not occur to me to re check tires. Several spinouts later.......

At least for Sunday temps will be consistent all day. There is chance of rain in forecast

Current weather forecast for Sun 2/18
9am: 50 degrees/Rain 55%/Humidity 73%
10am: 52 degrees/Rain 43%/Humidity 70%
12am: 57 degrees/Rain 51%/Humidity 61%
2pm: 62 degrees/Rain 47%/Humidity 55%
4pm: 64 degrees/Rain 34%/Humidity 53%

Tires: Continental ExtremeContact DW
Front: 275/40/20
Rear: 315/35/20

Are there additional pressure considerations if I have a few extra HP(590)?

-Chris

cmack · 02-16-2018, 10:27 AM

I found most answers here:
http://www.camaro5.com/forums/showthread.php?t=409482

jksynergy · 02-16-2018, 01:11 PM

Having autocrossed on the DW's, I would start with 35 frt and 32 rear pressure and see what you get. Autocross does not increase pressure very much due to the short time span of the run. See if that helps.
And have fun!! Jealous for sure as my car has been in hibernation since mid November.

cmack · 02-16-2018, 03:03 PM

Thanks jksynergy

Lonewolf583 · 03-02-2018, 11:27 AM

Before answering we'd need to know what you've done for suspension and drivetrain mods. I.E. Springs/bars/alignment and what diff you have.

Do you know how to "read" the tire after a run?

rocknroll_jeph · 03-05-2018, 12:35 AM

I was at the track on day and my friend who is a professional driver (For Ford...) kept taking pressure out of my tires... I can't remember what we stopped at but I remember that the air I let out from the tire was hot enough to cause me lots of pain.

Also if you are in the sun, remember that the tires on side the sun is on will be hotter and have a higher pressure. If possible park your car so the tires get even heat.

600hp-lpe · 03-20-2018, 02:49 PM

I have to remove a few pounds after every auto-x pass. as the tires heat up, the air pressure increases 3-4 lbs.

Find a starting point - front may be different than rear - and try to keep them consistent.

too much pressure in the front and you'll push in a corner.

02-15-2018, 03:36 PM	#1
cmack Drives: 2011 Camaro SS Join Date: Sep 2014 Location: Texas Posts: 196 View My Garage	Tire Pressure for autocross I was wondering If I can get some advise on tire pressure for autocross. Pressure but not tires I do not yet have spare wheels for different tire setup. Sunday 2/18 first autocross for 2018. It might be important to know I am not very good at autox. Last autocross was mid summer in Texas. Not knowing any better I just filled tires to 35 in am and left it there. Afternoon was well above 100 degrees and it did not occur to me to re check tires. Several spinouts later....... At least for Sunday temps will be consistent all day. There is chance of rain in forecast Current weather forecast for Sun 2/18 9am: 50 degrees/Rain 55%/Humidity 73% 10am: 52 degrees/Rain 43%/Humidity 70% 12am: 57 degrees/Rain 51%/Humidity 61% 2pm: 62 degrees/Rain 47%/Humidity 55% 4pm: 64 degrees/Rain 34%/Humidity 53% Tires: Continental ExtremeContact DW Front: 275/40/20 Rear: 315/35/20 Are there additional pressure considerations if I have a few extra HP(590)? -Chris

02-16-2018, 01:11 PM	#3
jksynergy Drives: 11 SW SYNERGY SERIES/14 1SS 1LE Join Date: May 2012 Location: Missouri Posts: 1,223	Having autocrossed on the DW's, I would start with 35 frt and 32 rear pressure and see what you get. Autocross does not increase pressure very much due to the short time span of the run. See if that helps. And have fun!! Jealous for sure as my car has been in hibernation since mid November. __________________ 2011 Summit White Synergy Series Edition, the hot innocent woman named Ava that we show off around town, dressed in white complete with angel's wings. Sold, but never forgotten. 2014 1SS 1LE. Bama, sporting Red Rock Metallic demon's horns, when we are ready to get naughty and open a can of whoopass! Airaid, Spectre, Xpel,Bowler shifter Peddars, UMI, Ult Perf. Diode Dynamics, JRE Tune, XS Power battery, Hooker Headers Blackheart exhaust,Powerbrake InstaGram & Twitter: @jlouie62 FB: hangtimeracing

03-02-2018, 11:27 AM	#5
Lonewolf583 Apex Predator Drives: 2010 2SS/RS M6 Rally Yellow Join Date: Jul 2013 Location: Seymour, IN Posts: 238	Before answering we'd need to know what you've done for suspension and drivetrain mods. I.E. Springs/bars/alignment and what diff you have. Do you know how to "read" the tire after a run? __________________ 2010 Camaro 2SS/RS - LS3/TR6060, Paid Off \o/ Beating physics into submission since 1991.

02-16-2018, 10:27 AM	#2
cmack Drives: 2011 Camaro SS Join Date: Sep 2014 Location: Texas Posts: 196 View My Garage	I found most answers here: http://www.camaro5.com/forums/showthread.php?t=409482

02-16-2018, 03:03 PM	#4
cmack Drives: 2011 Camaro SS Join Date: Sep 2014 Location: Texas Posts: 196 View My Garage	Thanks jksynergy

03-05-2018, 12:35 AM	#6
rocknroll_jeph Drives: 11 Camaro V6 RS, 03 BMW Z4 Join Date: Oct 2013 Location: Beijing & Michigan Posts: 497 View My Garage	I was at the track on day and my friend who is a professional driver (For Ford...) kept taking pressure out of my tires... I can't remember what we stopped at but I remember that the air I let out from the tire was hot enough to cause me lots of pain. Also if you are in the sun, remember that the tires on side the sun is on will be hotter and have a higher pressure. If possible park your car so the tires get even heat.

03-20-2018, 02:49 PM	#7
600hp-lpe Drives: 2010 Join Date: Jul 2009 Location: NH Posts: 4,788	I have to remove a few pounds after every auto-x pass. as the tires heat up, the air pressure increases 3-4 lbs. Find a starting point - front may be different than rear - and try to keep them consistent. too much pressure in the front and you'll push in a corner.