Managing tire PSI on track
#16
Rennlist Member
Thread Starter
Thanks on the BBS comment. People ask me all the time why I track with those wheels. I simple say that they are among the strongest, lightest fully forged wheels around...plus they look damn good doing it. When clean, they can’t be beat for looks on the street.
Last edited by Akunob; 05-04-2019 at 09:55 PM.
#17
You really cant copy what other people do or go completely by manufacturer recommendations. Way too may variables.
Its all about the Tire Pyrometer.
BONUS! The Tire Pyrometer also helps you set alignment for the track, which is another often discussed topic here.
Here is a good basic video:
You need to stick to what the pyrometer says and if you are getting insane increases in pressure and have to bleed excessively, consider purging and filling the tires with nitrogen, or at least find a drier air source.
Its all about the Tire Pyrometer.
BONUS! The Tire Pyrometer also helps you set alignment for the track, which is another often discussed topic here.
Here is a good basic video:
You need to stick to what the pyrometer says and if you are getting insane increases in pressure and have to bleed excessively, consider purging and filling the tires with nitrogen, or at least find a drier air source.
#18
Race Director
You really cant copy what other people do or go completely by manufacturer recommendations. Way too may variables.
Its all about the Tire Pyrometer.
BONUS! The Tire Pyrometer also helps you set alignment for the track, which is another often discussed topic here.
Here is a good basic video:
https://www.youtube.com/watch?v=onl7o_l78mw
You need to stick to what the pyrometer says and if you are getting insane increases in pressure and have to bleed excessively, consider purging and filling the tires with nitrogen, or at least find a drier air source.
Its all about the Tire Pyrometer.
BONUS! The Tire Pyrometer also helps you set alignment for the track, which is another often discussed topic here.
Here is a good basic video:
https://www.youtube.com/watch?v=onl7o_l78mw
You need to stick to what the pyrometer says and if you are getting insane increases in pressure and have to bleed excessively, consider purging and filling the tires with nitrogen, or at least find a drier air source.
#19
Rennlist Member
Thread Starter
You really cant copy what other people do or go completely by manufacturer recommendations. Way too may variables.
Its all about the Tire Pyrometer.
BONUS! The Tire Pyrometer also helps you set alignment for the track, which is another often discussed topic here.
Here is a good basic video:
https://www.youtube.com/watch?v=onl7o_l78mw
You need to stick to what the pyrometer says and if you are getting insane increases in pressure and have to bleed excessively, consider purging and filling the tires with nitrogen, or at least find a drier air source.
Its all about the Tire Pyrometer.
BONUS! The Tire Pyrometer also helps you set alignment for the track, which is another often discussed topic here.
Here is a good basic video:
https://www.youtube.com/watch?v=onl7o_l78mw
You need to stick to what the pyrometer says and if you are getting insane increases in pressure and have to bleed excessively, consider purging and filling the tires with nitrogen, or at least find a drier air source.
#21
Rennlist Member
Great thread.
ive a couple of used MPSC2 N2 left and after I use those up I will do Dunlops.
its nice to not have to start on 22PSI To keep them under 34PSI but that’s maybe due to high humidity and temps in FL.
ive a couple of used MPSC2 N2 left and after I use those up I will do Dunlops.
its nice to not have to start on 22PSI To keep them under 34PSI but that’s maybe due to high humidity and temps in FL.
#22
everyone who keeps dropping tire pressure, bakes their tires, you really need to get them to temp then adjust, that why every race team has tire warmers set them to the correct pressure prior to the track then adjust minimally, keep lowering them, keep baking them. If they get too hot, add air.
#23
Nordschleife Master
Originally Posted by Dougr743
everyone who keeps dropping tire pressure, bakes their tires, you really need to get them to temp then adjust, that why every race team has tire warmers set them to the correct pressure prior to the track then adjust minimally, keep lowering them, keep baking them. If they get too hot, add air.
#24
Guys, if you were doing this on a road race bike, you would be on your head before you new what hit you. If you really want this to work, get tire warmers, get the tire to proper race temp, then check the pressure. you want the tire to shed, you want to have wear without the tire getting greasy. IF they look shinny and slippery, then are getting too hot. Shedding is good, wear is good as long as its not chunking.
ex. 28lbs cold, put warmers on, set recommended tire temp to at "Say" 180 degrees" get the tire to temp, check pressure, if the tire recommendation at race temp is 30lbs and you have it at 180 degree and its 34lbs with warms on and tire to temp. lower it to 30. When you come in, it should be within a pound or 2. Check the temp and pressure
1. add air if they are higher, so if 3 lbs higher, add 3 lbs of air, if 3 lbs less, lower 3lbs then check, once you get them dialed in, you just have to vary to ambient temp, track temp. you should be able to set them and forget them once you get your setting close. Reminder, the tire is set before you go out, its at optimal temp and pressure prior to hitting the track, then you can see if you are too fast or slow for the temp. great drivers glide, ballet dance, around the track. They don't muscle the car. If you have unlimited funds and 4 sets of tires, you can muscle the car, but if you want to get the results, you have to balance the driving skills to the gear. Its just the way it is.
2. if you had them at ex. "180 degree" went out and the tire was lower when you came in, take air out, that will allow the air to raise on cold days to the optimal temp. then you have to understand time on the tire. 20 laps is different from 8 laps, you want to try and keep consistent, so if its a 30min stint, you need to keep track on your laps, just to keep track of the tire temp. always lean on more air than less for track days, you will get more life and better results over the coarse of the day!
ex. 28lbs cold, put warmers on, set recommended tire temp to at "Say" 180 degrees" get the tire to temp, check pressure, if the tire recommendation at race temp is 30lbs and you have it at 180 degree and its 34lbs with warms on and tire to temp. lower it to 30. When you come in, it should be within a pound or 2. Check the temp and pressure
1. add air if they are higher, so if 3 lbs higher, add 3 lbs of air, if 3 lbs less, lower 3lbs then check, once you get them dialed in, you just have to vary to ambient temp, track temp. you should be able to set them and forget them once you get your setting close. Reminder, the tire is set before you go out, its at optimal temp and pressure prior to hitting the track, then you can see if you are too fast or slow for the temp. great drivers glide, ballet dance, around the track. They don't muscle the car. If you have unlimited funds and 4 sets of tires, you can muscle the car, but if you want to get the results, you have to balance the driving skills to the gear. Its just the way it is.
2. if you had them at ex. "180 degree" went out and the tire was lower when you came in, take air out, that will allow the air to raise on cold days to the optimal temp. then you have to understand time on the tire. 20 laps is different from 8 laps, you want to try and keep consistent, so if its a 30min stint, you need to keep track on your laps, just to keep track of the tire temp. always lean on more air than less for track days, you will get more life and better results over the coarse of the day!
Last edited by Dougr743; 05-05-2019 at 10:04 PM.
#25
Rennlist Member
Thread Starter
I’d love to get your feedback on the Dunlops Trakcar, you drive as hard as they come. You should be able to start the day at higher psi’s than 22psi. My next test is (1) how long they last and (2) how their performance declines with time. I have the MPSC2s for reference, whose performance started to drop after about 10-12 heat cycles and were about done (for me) after about 20 heat cycles.
#26
Rennlist Member
Thread Starter
everyone who keeps dropping tire pressure, bakes their tires, you really need to get them to temp then adjust, that why every race team has tire warmers set them to the correct pressure prior to the track then adjust minimally, keep lowering them, keep baking them. If they get too hot, add air.
Guys, if you were doing this on a road race bike, you would be on your head before you new what hit you. If you really want this to work, get tire warmers, get the tire to proper race temp, then check the pressure. you want the tire to shed, you want to have wear without the tire getting greasy. IF they look shinny and slippery, then are getting too hot. Shedding is good, wear is good as long as its not chunking.
ex. 28lbs cold, put warmers on, set recommended tire temp to at "Say" 180 degrees" get the tire to temp, check pressure, if the tire recommendation at race temp is 30lbs and you have it at 180 degree and its 34lbs with warms on and tire to temp. lower it to 30. When you come in, it should be within a pound or 2. Check the temp and pressure
1. add air if they are higher, so if 3 lbs higher, add 3 lbs of air, if 3 lbs less, lower 3lbs then check, once you get them dialed in, you just have to vary to ambient temp, track temp. you should be able to set them and forget them once you get your setting close. Reminder, the tire is set before you go out, its at optimal temp and pressure prior to hitting the track, then you can see if you are too fast or slow for the temp. great drivers glide, ballet dance, around the track. They don't muscle the car. If you have unlimited funds and 4 sets of tires, you can muscle the car, but if you want to get the results, you have to balance the driving skills to the gear. Its just the way it is.
2. if you had them at ex. "180 degree" went out and the tire was lower when you came in, take air out, that will allow the air to raise on cold days to the optimal temp. then you have to understand time on the tire. 20 laps is different from 8 laps, you want to try and keep consistent, so if its a 30min stint, you need to keep track on your laps, just to keep track of the tire temp. always lean on more air than less for track days, you will get more life and better results over the coarse of the day!
ex. 28lbs cold, put warmers on, set recommended tire temp to at "Say" 180 degrees" get the tire to temp, check pressure, if the tire recommendation at race temp is 30lbs and you have it at 180 degree and its 34lbs with warms on and tire to temp. lower it to 30. When you come in, it should be within a pound or 2. Check the temp and pressure
1. add air if they are higher, so if 3 lbs higher, add 3 lbs of air, if 3 lbs less, lower 3lbs then check, once you get them dialed in, you just have to vary to ambient temp, track temp. you should be able to set them and forget them once you get your setting close. Reminder, the tire is set before you go out, its at optimal temp and pressure prior to hitting the track, then you can see if you are too fast or slow for the temp. great drivers glide, ballet dance, around the track. They don't muscle the car. If you have unlimited funds and 4 sets of tires, you can muscle the car, but if you want to get the results, you have to balance the driving skills to the gear. Its just the way it is.
2. if you had them at ex. "180 degree" went out and the tire was lower when you came in, take air out, that will allow the air to raise on cold days to the optimal temp. then you have to understand time on the tire. 20 laps is different from 8 laps, you want to try and keep consistent, so if its a 30min stint, you need to keep track on your laps, just to keep track of the tire temp. always lean on more air than less for track days, you will get more life and better results over the coarse of the day!
#27
Race Director
everyone who keeps dropping tire pressure, bakes their tires, you really need to get them to temp then adjust, that why every race team has tire warmers set them to the correct pressure prior to the track then adjust minimally, keep lowering them, keep baking them. If they get too hot, add air.
#28
Chick hawk makes tire warmers, auto set (175 degrees, i believe for cars)about 2k. They are all i used on my road race bikes for years. 1 hour to get to temp, them you put them on as soon as you get off the track. they stay at temp all day, no heat cycles. you can manage a full day with little to no major tire loss and you don't have the swings in tire pressure or running the tire cold, etc etc. I spend a lot of time in the smokeys, live outside charlotte. I was amazed at how many people this weekend complained of tire issues. was 75 degree average. Its a mental thing, i think, everyone drops pressure, bakes there tires then bitches. lol I have 6500 miles on my cup2's, and plan on getting 10k out of them, all mountain trips. I know its not track time, but if you monitor them, you will see, cold i set 29 front, 31 rear, run a 20 mile run, 80% and have 33 front, 36 rear just about as hard as i want to press it. temps around 160 when testing with a laser reader. so Its an example of how to gauge it, it they were 39 rear, i would add 3 to 4 lbs cold, so starting the day higher, aprox 31 front, 35 rear, then do the same 20 mile run (like running the dragon in and out) thats 20 miles and check at the bridge or gas station. once i see the average, i know to check in the morning depending on outside temp. I know its a PITA but its better than baking tires.
I plan on doing a fair amount of track time next year, just been swamped with home projects and need to pick up a trailer, some other gear, etc etc and really have been enjoying my mini mountain trips. good luck, try this, it works
I plan on doing a fair amount of track time next year, just been swamped with home projects and need to pick up a trailer, some other gear, etc etc and really have been enjoying my mini mountain trips. good luck, try this, it works