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Thread: Preparing a Street(turbo) Car for a Road Course?

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Posts: 61-70 of 78
2012-07-04 06:46:25
#61
Originally Posted by blusteelsr20
How hot is it going to be on the 11th? Stick with recommended tire pressures for now. Keep it simple.


Probably 95F+
Last edited by gomba on 2012-07-04 at 06-46-39.
2012-07-09 03:46:28
#62
Any last words regarding tire pressure or anything else?

Track day is this Wednesday.

-G
2012-07-10 02:32:51
#63
Tire pressures used are as stated as before.

I think you are somewhat over thinking things.........

Keep it simple and it will go a long way!!
2012-07-10 02:38:14
#64
Originally Posted by wnwright
Don't inflate to max. Inflate to recommended.

Don't worry about it after that for first day. Later you will want to do it based on tire temp, but can see based on wear also.


Originally Posted by wes
On the AGX's it depends what springs you have. When I ran them with 350F 300R springs I preferred 2 front. 4-5 rear.

I never used the softest setting even on Eibach sport line springs and AGX's.

You want enough damping to control the spring and at a higher sprig rate than stock the softest settings do not provide that.


Originally Posted by blusteelsr20
How hot is it going to be on the 11th? Stick with recommended tire pressures for now. Keep it simple.


Originally Posted by Boostlee
Tire pressures used are as stated as before.

I think you are somewhat over thinking things.........

Keep it simple and it will go a long way!!


Originally Posted by gomba
OK, 2/4, I can do that. That's close to what I run on the street so it shouldn't feel too different.

Regarding tire pressure. I did some reading and found that tire pressures are mainly to be set according to tire wear. You want to make sure that you have even wear AND also that the tire doesn't bend too much to actually go under the wheel(handling of course is also a reason..but probably one I won't be able to adjust for at my experience level). I can understand why you want a higher pressure, but so close the max tire pressure I'm not really getting and here's why...the reading I did said that tires can inflate upwards of 10psi from cold pressure depending on how hard you use the tire and the ambient outside temperature(it'll be HOT July 11th). If I fill the tire pressure within 2-4 psi of the max sidewall rating and the tire goes from let's say 40psi to 50psi..and the sidewall pressure says 44, how would that affect the tire? I'm worried of it blowing out or something on the track. What am I missing here??

-G



Reason why I'm confused. So do I go with sidewall rating or the nissan 33/30?

Supposedly running higher pressure also helps the tire from rolling under the rim which doesn't sound very safe if I keep it low/stock.

This says:

Basics of Tire Pressure

"When driving on a racetrack you should run a higher tire pressure than you would normally run on the street. A higher pressure helps keep your tires from rolling over onto the sidewalls and destroying the outside corners of your tread under hard cornering. A tire inflated to a higher pressure will also run cooler at high speeds, important to avoid chunking and tread separation. "
Last edited by gomba on 2012-07-10 at 02-39-17.
2012-07-10 02:42:51
#65
Originally Posted by gomba
"When driving on a racetrack you should run a higher tire pressure than you would normally run on the street. A higher pressure helps keep your tires from rolling over onto the sidewalls and destroying the outside corners of your tread under hard cornering. A tire inflated to a higher pressure will also run cooler at high speeds, important to avoid chunking and tread separation. "


LOL... Maybe on some tires, but I've never run a tire that needs higher pressures to have even tire temps.

Edit: maybe they meant track hot pressure vs street cold pressure? But that is stupid.
Last edited by wnwright on 2012-07-10 at 03-53-19.
2012-07-10 03:08:06
#66
^^ LOL

So whats the difference in pressure between what Nissan recommends to what the sidewall recommends? +/- 3-5 psi max I bet........(question to Gomba)

Also, do not forget that tires gain psi with temperature (read: track usage). (Perfect) Gas law says this.

Again, I think you are over thinking things and lack some of the basic "common/experience" sense knowledge of how some of these things work (not a degrading statement, just a observed fact)

For instance: wes preferred 2f/4-5 rear because wes has been driving the car for quiet some time before settling on a proper pressure/shock setting (and this is after he started at a proper baseline I am sure). He has MUCH more seat time than you and probably did not start fiddling with things until the car itself had reached the limits of wes' driving abilities.
Last edited by Boostlee on 2012-07-10 at 03-42-28.
2012-07-10 03:34:51
#67
Originally Posted by Boostlee
^^ LOL

So whats the difference in pressure between what Nissan recommends to what the sidewall recommends? +/- 3-5 psi max I bet........

Also, do not forget that tires gain psi with temperature (read: track usage). (Perfect) Gas law says this.

Again, I think you are over thinking things and lack some of the basic "common/experience" sense knowledge of how some of these things work (not a degrading statement, just a observed fact)

For instance: wes preferred 2f/4-5 rear because wes has been driving the car for quiet some time before settling on a proper pressure/shock setting (and this is after he started at a proper baseline I am sure). He has MUCH more seat time than you and probably did not start fiddling with things until the car itself had reached the limits of wes' driving abilities.


Pretty much says it all right here. Stop overthinking and start driving. Have fun. Gomba, you will understand all of this eventually but for your 1st track event just enjoy. Lot of stuff to learn but it doesn't happen all in one day. Patience grasshopper.
2012-07-10 04:42:56
#68
Originally Posted by Boostlee

Again, I think you are over thinking things and lack some of the basic "common/experience" sense knowledge of how some of these things work (not a degrading statement, just a observed fact)


I think your observation is accurate.

Originally Posted by blusteelsr20

Pretty much says it all right here. Stop overthinking and start driving. Have fun. Gomba, you will understand all of this eventually but for your 1st track event just enjoy. Lot of stuff to learn but it doesn't happen all in one day. Patience grasshopper.


over thinking is what got me to the track in the first place

Also, if I didn't do some due diligence, I would have ended up on the track with old brake fluid, street brakes, old tires, a radiator that would have overheated for sure, and a boost level that may have blew my engine. Sooo, with all that said I think asking more questions makes sense. Don't want to miss anything..driving your car on a road course is serious and I want to be safe which is my first priority. That's why I'm so concerned about this stuff.

Originally Posted by Boostlee

So whats the difference in pressure between what Nissan recommends to what the sidewall recommends? +/- 3-5 psi max I bet........(question to Gomba)


I actually didn't know there was a recommended pressure on a tire, only the maximum pressure and usually the max pressure is a LOT higher than recommended Nissan. I'm going to say if Nissan is 33, max pressure is over 45psi.

:EDIT: Max pressure for the kumho's in 205-50-15 is 51 psi.

-G
Last edited by gomba on 2012-07-10 at 04-56-43.
2012-07-10 04:47:14
#69
error
Last edited by gomba on 2012-07-10 at 04-47-50.
2012-07-10 10:16:52
#70
Originally Posted by gomba
Originally Posted by Boostlee

So whats the difference in pressure between what Nissan recommends to what the sidewall recommends? +/- 3-5 psi max I bet........(question to Gomba)


I actually didn't know there was a recommended pressure on a tire, only the maximum pressure and usually the max pressure is a LOT higher than recommended Nissan. I'm going to say if Nissan is 33, max pressure is over 45psi.

:EDIT: Max pressure for the kumho's in 205-50-15 is 51 psi.

-G


Yes, but there is a difference between "maximum" tire pressure and "recommended" running pressure..........

There is nothing wrong with asking questions!! I have been there as well and you will get the hang of this soon enough.

But there is one thing which my professor always told me when it comes to anything engineering; Take a step back and do a common sense test and see if what you are thinking makes sense because
1) It will help you gain a much better understanding
2) You end up answering much of your questions

Anyways, no more tangents for me. Any other questions and such you have?? Tomorrow is approaching fast!!
Last edited by Boostlee on 2012-07-10 at 10-17-47.
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