153 Mph indicated at Pocono Long Course with 2 infields !
#16
Re: GT3 on track--
Originally posted by DCLee
I took one out to Summit this weekend for a NASA DE. Saw 147 mph at the end of the front straight--and this was waay before the first marker.
I took one out to Summit this weekend for a NASA DE. Saw 147 mph at the end of the front straight--and this was waay before the first marker.
__________________
Larry Herman
2016 Ford Transit Connect Titanium LWB
2018 Tesla Model 3 - Electricity can be fun!
Retired Club Racer & National PCA Instructor
Past Flames:
1994 RS America Club Racer
2004 GT3 Track Car
1984 911 Carrera Club Racer
1974 914/4 2.0 Track Car
CLICK HERE to see some of my ancient racing videos.
Larry Herman
2016 Ford Transit Connect Titanium LWB
2018 Tesla Model 3 - Electricity can be fun!
Retired Club Racer & National PCA Instructor
Past Flames:
1994 RS America Club Racer
2004 GT3 Track Car
1984 911 Carrera Club Racer
1974 914/4 2.0 Track Car
CLICK HERE to see some of my ancient racing videos.
#17
In any event, I would recommend using a probe pyrometer to eliminate the guesswork and objectively get the right pressure for your set-up.
Couple of questions:
1. Were can I get a good pyrometer on line?
2. How do you know what the correct temp is?
3. Should the temp be the same across the tire (inside, outside and middle). What does it tell you if it isn't?
Thanks,
Kevin
#18
4 Kurves,
Dave Turner Motorsports on Magnatron in San Diego carries many different types of pyrometers. Call him and ask him for a simple probe type and he will send it to you. His WEB site is www.Daveturner.com.
For getting the right tire pressure, you need to (1) get the tires hot by running around the track several times at speed, (2) go to the closest safe place where you can stop the car --do not take a cool down lap, (3) have someone waiting there with a pad of paper, pen and pyrometer (actually two people is better, one to read the pyrometer and the other to write the numbers down--turn your front wheels to the stops in one direction or the other to make access easier, (4) check each tires' temps in 3 places: the outside edge of the tread you would expect to contact the track (in other words, NOT the sidewall), check the middle of the tread and the inside edge, (4) add the numbers for the inside and outside edges and divide by 2; you want the average of the inside and outside temps to equal the middle temp. If the middle is higher than the average of the inside/outside, you are overinflated. If the average of the inside/outside is higher than the middle, you are underinflated. Adjust pressure by a lb. or so and try again. If you start at 34/32, you will be close with the MPSCs and adjustments will be small.
Don't worry, for now, about actual temps. They will range from the 160s to 200 and that's OK. And the difference in temps between inside and outside edges is a function of how hard you are driving, the negative camber and the type/direction of turns. Textbooks on setup say that optimum grip comes when the temps for the outside and inside edges are equal, but in actual practice, most cars are not setup this way. How much camber are you running?
Dave Turner Motorsports on Magnatron in San Diego carries many different types of pyrometers. Call him and ask him for a simple probe type and he will send it to you. His WEB site is www.Daveturner.com.
For getting the right tire pressure, you need to (1) get the tires hot by running around the track several times at speed, (2) go to the closest safe place where you can stop the car --do not take a cool down lap, (3) have someone waiting there with a pad of paper, pen and pyrometer (actually two people is better, one to read the pyrometer and the other to write the numbers down--turn your front wheels to the stops in one direction or the other to make access easier, (4) check each tires' temps in 3 places: the outside edge of the tread you would expect to contact the track (in other words, NOT the sidewall), check the middle of the tread and the inside edge, (4) add the numbers for the inside and outside edges and divide by 2; you want the average of the inside and outside temps to equal the middle temp. If the middle is higher than the average of the inside/outside, you are overinflated. If the average of the inside/outside is higher than the middle, you are underinflated. Adjust pressure by a lb. or so and try again. If you start at 34/32, you will be close with the MPSCs and adjustments will be small.
Don't worry, for now, about actual temps. They will range from the 160s to 200 and that's OK. And the difference in temps between inside and outside edges is a function of how hard you are driving, the negative camber and the type/direction of turns. Textbooks on setup say that optimum grip comes when the temps for the outside and inside edges are equal, but in actual practice, most cars are not setup this way. How much camber are you running?
#19
Textbooks on setup say that optimum grip comes when the temps for the outside and inside edges are equal, but in actual practice, most cars are not setup this way. How much camber are you running?
Thanks for the advice - I'm going to give this a try.
-Kevin