Track setup.. tires/psi etc - Toyota Yaris Forums

2manywheels · 09-01-2010, 06:05 PM

Out to the track tomorrow.
Not an autocross. But full sized with a 1/2mile straight away.. and some decent fast corners..
Besides checking everything over(torque/brakes/lines safety etc..)
What should I start with for tire pressures?
Supposed to be 20 degrees tomorrow and dry.
Cold, they are currently 32.5psi(Dunlop Direzza's) 205-50-15's on the 15"x7 Enkei RPF1's.

I have a tire temp guage I will be checking between runs to check for higher heat on different parts of the tire etc.
I have never taken a FWD car around this track. Only rear drive ferarri's and vettes.
Any thoughts or suggestions?

cali yaris · 09-01-2010, 07:01 PM

Start with manufacturer pressure and adjust from there, even if it means pulling over during a session. You'll know after a couple of laps and they heat up what's happening with your tires and over/understeer, softness, etc.

nemesisz · 09-01-2010, 08:59 PM

My experience with the same setup (Star Specs 205/50 + RPF clones) was great. I ran a track day (4 30 minute sessions) at Homestead Miami Speedway with ambient temps of 94 and track temps of 105+. My pressure was initially set at 42psi all around. It was set and forget. I ran all day with great tire wear and no tire melting or grip reduction.

If I were to do another day there with the same temps I might reduce the pressure in the front to 38-40psi. Infamous Turn 10 is the only place where more rear rotation may not be the ideal setup.

2manywheels · 09-01-2010, 10:55 PM

THX Garm/Nemesisz!

soloecho2 · 09-02-2010, 07:49 PM

How did you do ?? I run 38 in the front and 42 in the rear and I only have to adjust them once after they warm up. Sorry I didn't catch the first post but the company sent me to Wichita for a few days.

2manywheels · 09-03-2010, 12:36 PM

Suprisingly well!
37.5 front and back eventually. After a few sessions/hot laps. brought them down from 40ish. The Dunlops were great. Might consider the 23/24mm Sway bar for next season. Supercharger will be a welcome addition in the straights. Video is being posted on youtube now. Will update a link later. Hopefully I didn't swear too loud while ripping around!

2manywheels · 09-05-2010, 03:15 PM

short vid.. :P
http://www.youtube.com/watch?v=ytQWt0zwHGY

nemesisz · 09-06-2010, 08:16 AM

Great video. I really like the sunset reflection in the windows.
How fast were you going in the straights?

2manywheels · 09-06-2010, 09:30 AM

About 165km/h I think I might have put a dent in the floor board from having the pedal mashed against it for almost 3 hours...

Blown_xa · 10-05-2010, 08:33 PM

I find that optimal tire pressure varies between tires. On my NT-o1's I run 30psi cold all around. On my R1R's I run 28 cold in the front and 34 cold in the rear to get the same balance. Also depends on your suspension and alignment. If I was on stock suspension and factory alignment those pressures would be too low. So it really comes down to what you find best.

jetbtkng · 10-06-2010, 04:17 AM

now this is for my solara i use toyo r888 & i start out 38 front & 36 back, after the 1st session i check pressure & when there hot i lower pressure to 48 front 44 back the weather usually in the 90's-low 100;s high, heres a vid http://www.youtube.com/watch?v=1pLigAQIFzw

09-01-2010, 06:05 PM	#1
2manywheels Drives: 09 YarHB Join Date: Feb 2009 Location: Canada Posts: 175	Track setup.. tires/psi etc Out to the track tomorrow. Not an autocross. But full sized with a 1/2mile straight away.. and some decent fast corners.. Besides checking everything over(torque/brakes/lines safety etc..) What should I start with for tire pressures? Supposed to be 20 degrees tomorrow and dry. Cold, they are currently 32.5psi(Dunlop Direzza's) 205-50-15's on the 15"x7 Enkei RPF1's. I have a tire temp guage I will be checking between runs to check for higher heat on different parts of the tire etc. I have never taken a FWD car around this track. Only rear drive ferarri's and vettes. Any thoughts or suggestions?

09-01-2010, 07:01 PM	#2
cali yaris ULTIMATE View User's Garage Drives: 07 Yaris Turbo Join Date: May 2007 Location: Canoga Park, CA Posts: 14,859	Start with manufacturer pressure and adjust from there, even if it means pulling over during a session. You'll know after a couple of laps and they heat up what's happening with your tires and over/understeer, softness, etc. __________________ Micro Image forums, online store and shop are now closed. It was a great eight year run, but it was time to focus on other things. I'm still selling parts on eBay under micro*image seller ID and customers can still make requests for anything specific.

10-05-2010, 08:33 PM	#10
Blown_xa Drives: Scion xA Join Date: Oct 2009 Location: Virginia Posts: 449	I find that optimal tire pressure varies between tires. On my NT-o1's I run 30psi cold all around. On my R1R's I run 28 cold in the front and 34 cold in the rear to get the same balance. Also depends on your suspension and alignment. If I was on stock suspension and factory alignment those pressures would be too low. So it really comes down to what you find best. __________________ Ptuning.com

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09-01-2010, 08:59 PM	#3
nemesisz 559 Before the Hack Drives: 07 Yaris LB Join Date: May 2007 Location: Miramar Posts: 51	My experience with the same setup (Star Specs 205/50 + RPF clones) was great. I ran a track day (4 30 minute sessions) at Homestead Miami Speedway with ambient temps of 94 and track temps of 105+. My pressure was initially set at 42psi all around. It was set and forget. I ran all day with great tire wear and no tire melting or grip reduction. If I were to do another day there with the same temps I might reduce the pressure in the front to 38-40psi. Infamous Turn 10 is the only place where more rear rotation may not be the ideal setup.

09-01-2010, 10:55 PM	#4
2manywheels Drives: 09 YarHB Join Date: Feb 2009 Location: Canada Posts: 175	THX Garm/Nemesisz!

09-02-2010, 07:49 PM	#5
soloecho2 Drives: 2004 Echo HB Join Date: Oct 2008 Location: Orono, Ontario Posts: 186	How did you do ?? I run 38 in the front and 42 in the rear and I only have to adjust them once after they warm up. Sorry I didn't catch the first post but the company sent me to Wichita for a few days.

09-03-2010, 12:36 PM	#6
2manywheels Drives: 09 YarHB Join Date: Feb 2009 Location: Canada Posts: 175	Suprisingly well! 37.5 front and back eventually. After a few sessions/hot laps. brought them down from 40ish. The Dunlops were great. Might consider the 23/24mm Sway bar for next season. Supercharger will be a welcome addition in the straights. Video is being posted on youtube now. Will update a link later. Hopefully I didn't swear too loud while ripping around!

09-05-2010, 03:15 PM	#7
2manywheels Drives: 09 YarHB Join Date: Feb 2009 Location: Canada Posts: 175	short vid.. :P http://www.youtube.com/watch?v=ytQWt0zwHGY

09-06-2010, 08:16 AM	#8
nemesisz 559 Before the Hack Drives: 07 Yaris LB Join Date: May 2007 Location: Miramar Posts: 51	Great video. I really like the sunset reflection in the windows. How fast were you going in the straights?

09-06-2010, 09:30 AM	#9
2manywheels Drives: 09 YarHB Join Date: Feb 2009 Location: Canada Posts: 175	About 165km/h I think I might have put a dent in the floor board from having the pedal mashed against it for almost 3 hours...

10-06-2010, 04:17 AM	#11
jetbtkng idiot racing team Drives: 2010 hatchback Join Date: Oct 2010 Location: so cal Posts: 19	now this is for my solara i use toyo r888 & i start out 38 front & 36 back, after the 1st session i check pressure & when there hot i lower pressure to 48 front 44 back the weather usually in the 90's-low 100;s high, heres a vid http://www.youtube.com/watch?v=1pLigAQIFzw