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09-01-2010, 06:05 PM | #1 |
Drives: 09 YarHB Join Date: Feb 2009
Location: Canada
Posts: 175
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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 |
ULTIMATE
Drives: 07 Yaris Turbo Join Date: May 2007
Location: Canoga Park, CA
Posts: 14,859
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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.
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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. |
09-01-2010, 08:59 PM | #3 |
559 Before the Hack
Drives: 07 Yaris LB Join Date: May 2007
Location: Miramar
Posts: 51
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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 |
Drives: 09 YarHB Join Date: Feb 2009
Location: Canada
Posts: 175
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THX Garm/Nemesisz!
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09-02-2010, 07:49 PM | #5 |
Drives: 2004 Echo HB Join Date: Oct 2008
Location: Orono, Ontario
Posts: 186
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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.
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09-03-2010, 12:36 PM | #6 |
Drives: 09 YarHB Join Date: Feb 2009
Location: Canada
Posts: 175
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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 |
Drives: 09 YarHB Join Date: Feb 2009
Location: Canada
Posts: 175
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short vid.. :P
http://www.youtube.com/watch?v=ytQWt0zwHGY |
09-06-2010, 08:16 AM | #8 |
559 Before the Hack
Drives: 07 Yaris LB Join Date: May 2007
Location: Miramar
Posts: 51
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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 |
Drives: 09 YarHB Join Date: Feb 2009
Location: Canada
Posts: 175
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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...
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10-05-2010, 08:33 PM | #10 |
Drives: Scion xA Join Date: Oct 2009
Location: Virginia
Posts: 449
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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.
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Ptuning.com |
10-06-2010, 04:17 AM | #11 |
idiot racing team
Drives: 2010 hatchback Join Date: Oct 2010
Location: so cal
Posts: 19
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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
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