Quick question: RE050A PP vs RE01R
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Originally Posted by Naka' date='Mar 20 2007, 03:08 PM
Well, you still haven't answer my question on how you decided that 32 psi is the best hot pressure for the RE 01R on the s2000.
Don't get me wrong. Tires do get greasy. But that's uncommon. Overinflating, is common. Despite popular belief, you do want some roll.
I used to use the tire chalk technique too, from what everybody says, and from what I read on the Internet.
Until I went to a seminar about tires run by Michelin engineers. First thing they did, was to throw away those internet myths. We even took our cars to the track and they would wait for you to come in after hot laps to fine tune your tire pressures.
You won't believe how overinflated the tires were using the chalk technique. And I'm not talking about me only. I'm talking about most of the instructors that were attending this seminar.
Since I bought a pyrometer, I haven't had greasy tires anymore.
I usually use R-compound tires, but when I use street tires, using the same technique has minimized that problem big time. In fact, my pressures are almost 4 psi lower than what the internet consensus dictates for my car and tires.
I'm not saying you are wrong. I'm saying the technique you may be using to optimize your tire pressure may not be adequate enough.
Just enough to say, that every student I had, and used my tire pyrometer to adjust their tire pressures, ended up with significantly lower tire pressures than they thought they needed. And they all agreed that it made a tremendous difference in traction and consistency.
Give it a try. It will make you safer. Whether you are racing or not, it will make your runs safer.
Don't get me wrong. Tires do get greasy. But that's uncommon. Overinflating, is common. Despite popular belief, you do want some roll.
I used to use the tire chalk technique too, from what everybody says, and from what I read on the Internet.
Until I went to a seminar about tires run by Michelin engineers. First thing they did, was to throw away those internet myths. We even took our cars to the track and they would wait for you to come in after hot laps to fine tune your tire pressures.
You won't believe how overinflated the tires were using the chalk technique. And I'm not talking about me only. I'm talking about most of the instructors that were attending this seminar.
Since I bought a pyrometer, I haven't had greasy tires anymore.
I usually use R-compound tires, but when I use street tires, using the same technique has minimized that problem big time. In fact, my pressures are almost 4 psi lower than what the internet consensus dictates for my car and tires.
I'm not saying you are wrong. I'm saying the technique you may be using to optimize your tire pressure may not be adequate enough.
Just enough to say, that every student I had, and used my tire pyrometer to adjust their tire pressures, ended up with significantly lower tire pressures than they thought they needed. And they all agreed that it made a tremendous difference in traction and consistency.
Give it a try. It will make you safer. Whether you are racing or not, it will make your runs safer.
Joined: May 2005
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Originally Posted by Naka' date='Mar 20 2007, 03:08 PM
Don't get me wrong. Tires do get greasy. But that's uncommon. Overinflating, is common. Despite popular belief, you do want some roll.
Since I bought a pyrometer, I haven't had greasy tires anymore.
Since I bought a pyrometer, I haven't had greasy tires anymore.
Based on the discussion in this thread, I think I'm running way too much air in the tires. I usually add 3 or 4 lbs. at the track, which translates to 35 cold in the back and 36 cold in the front. My hot temps are therefore running about 43-44 at the end of a session. Gee, 32 hot is about a dozen pounds less than I'm running now.
Somehow, I was under the belief that I needed more air at the track for safety reasons, i.e., the chance that in a spin the rim might dig into the pavement and flip the car if there wasn't enough air in the tire.
Is there a definative answer to all of this somewhere?
Joined: Apr 2004
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From: Redmond, Washington, USA
Yeah. The definitive answer is "it depends."
On the tires--size, compound, etc.
My autocross tires like to be 29-30, so I start off at 29-30, and bleed off after each run (if it's a decently warm day).
My track tires (RA-1s) like 39-40, so I start at around 34, and see how it feels. If it feels greasy, it's probably gotten too warm, so I check.
For one set, I used Michelin Pilot Sport Cups on the track. They liked to be around 30.
Different tires like different pressures.
On the tires--size, compound, etc.
My autocross tires like to be 29-30, so I start off at 29-30, and bleed off after each run (if it's a decently warm day).
My track tires (RA-1s) like 39-40, so I start at around 34, and see how it feels. If it feels greasy, it's probably gotten too warm, so I check.
For one set, I used Michelin Pilot Sport Cups on the track. They liked to be around 30.
Different tires like different pressures.
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