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Tire Pressure?

Old 10-09-07, 02:29 PM
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Tire Pressure?

I'm going to my first track day in November and I was wondering what tire pressure I should use? I'm assuming its going to be 50-60 degrees Fahrenheit and it's at Lime Rock in Connecticut.

Thanks
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Old 10-09-07, 02:38 PM
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You run with whatever pressure gives you the biggest contact patch... there is no one simple answer.

It varies based on the weight of the car and driver, tires, and the temperature.

But I'd start at around 38 and change it as necessary (buy an air tank, they're $20 at walmart). Track days are not like autocross where you only get 5 minutes of actual driving time (You can actually try different settings). The low temperatures means you can start a bit higher than you would on a hot day.
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Old 10-09-07, 02:57 PM
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Originally Posted by Specter328 View Post
I'm going to my first track day in November and I was wondering what tire pressure I should use? I'm assuming its going to be 50-60 degrees Fahrenheit and it's at Lime Rock in Connecticut.

Thanks
For an FD, I would start with about 30-32 F and 26-28 R and then adjust from there as needed.
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Old 10-09-07, 03:09 PM
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Lime Rock has their own air so you won't need the air tank. They also have fuel at the track. Might want to bring some munchies and something to drink though. And some warm clothes as it gets chilly up there in November.

Who is organizing the event? PDA?

Considering its your first track day, I don't suggest worrying too much about tire air pressure. That takes more expensive tools (and the knowledge of how to use them) than you need for the first track day.

What tires are they and what rims are you running?

In the past on other cars, I often set my pressures slightly higher than what I run on the street - maybe around 35 PSI. I often did this so that the edge of the tire doesn't get chunked up on a street friendly aligned car and/or type of tire being used. However that was with other cars (BMW, VW, FC RX7) etc that don't have dynamic camber gain like the FD.

I haven't noticed the need to really increase tire pressures on the FD for HPDE events. I generally run them around 33 PSI. This is with a Kumho MX 255/40/17 on a 17"x9" wheel.
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Old 10-09-07, 03:27 PM
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Originally Posted by Specter328 View Post
I'm going to my first track day in November and I was wondering what tire pressure I should use? I'm assuming its going to be 50-60 degrees Fahrenheit and it's at Lime Rock in Connecticut.

Thanks

We need to know what tire you're running. Any numbers given without knowing the type of tire is absolutely suspect.
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Old 10-09-07, 03:36 PM
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Thanks for the replies. The tires are Falken Azenis RT-615s 255/40-17 mounted on Enkei NT03+Ms 17x9.5 +44 all around. The event is a NASA HPDE.
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Old 10-09-07, 04:18 PM
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Old 10-09-07, 09:05 PM
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Thanks for the help. I'll go with 30psi front and 27psi rear along with 1.2 degrees of camber up front and 1 degree out back, I'm gonna even out the corners with 25 inch ride height, the only thing I'm still unsure of is the damper settings. My dampers are adjustable from 1-15, 1 being softest and 15 being stiffest, they are currently set at 6 which is nice for the street. What would be a good track setting for a beginner? The coilovers are Stance GR+ with 12kg springs front and rear.
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Old 10-09-07, 10:42 PM
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Originally Posted by Specter328 View Post
My dampers are adjustable from 1-15, 1 being softest and 15 being stiffest, they are currently set at 6 which is nice for the street. What would be a good track setting for a beginner? The coilovers are Stance GR+ with 12kg springs front and rear.
I would suggest leaving them as they are. At least the car will be familiar to you on the track. After you have some events under you belt, then start adjusting them.
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Old 10-09-07, 11:16 PM
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Thanks for all the help.
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Old 10-10-07, 12:22 AM
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Might want to search for howard coleman's recommendations on spring rates also.

Personally, I wouldn't set ride height at 25" for a street car especially if you are in NY. I lived there for 37 years... From my personal experience, I'd say best minimum ride height for a street car is 25.5" as it gives you just enough clearance to navigate driveways and such. The 1/2 made a difference.
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Old 10-10-07, 09:17 AM
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The roads around me aren't all that bad but I'll take it in to consideration. As I set up the car I keep forgetting it's a street car that will be tracked not a dedicated track car.
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