blacksheep-1 said:

Again, not a treaded tire guy, but we ran the Goodyear supercar F1 at Daytona in a 12 hour race and they were as fast at the end, as the beginning

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The 3 or the 3R?

And I just assumed that any 12 hour race would have multiple tire changes. I am always discovering how little I know about everything.

OK i got a question. So checking front tires temps seems like good way to monitor tires. I thought looking at them would work but did not really give me feedback till it was too late maybe. I bought the long acre temp probe my question is what is the best way to employ this? As soon as you come off track and park you crawl under and start probing? Assume you gotta do this fairly quickly while tires are warm? What is the time frame? Or did i just waste money?

Pretty sure i read about this somewhere on here

You can't wait until you come off track and stop to crawl under. You have to do it will the car is still moving.

Haha. Kinda figured as much

In any case i guess the big takeaway is not temp necessarily but difference in temp across face of tire

Junkyard Dog said:

You can't wait until you come off track and stop to crawl under. You have to do it will the car is still moving.

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There is a grain of truth in there. You don't want to wait and give them time to cool. Come off the track hot (no cool down lap) and have someone waiting at track exit with the temperature probe and pressure gauge. Stop and check the tires as soon as you are out of the way in a safe spot. You can drive around the paddock to cool of the car after you have pressures and temps written down.

Junkyard Dog said:

You can't wait until you come off track and stop to crawl under. You have to do it will the car is still moving.

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How do you measure tire temp while the car is moving? Are there infrared temp sensors that are cheap enough for amateurs and weekend warriors to afford?

I think that was a joke as you need to measure across the face of the tread kinda hard while moving….

665.0coupe said:

Are there infrared temp sensors that are cheap enough for amateurs and weekend warriors to afford?

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I don't know, but I thought it was done with probes.

Junkyard Dog said:

The 3 or the 3R?

And I just assumed that any 12 hour race would have multiple tire changes. I am always discovering how little I know about everything.

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The hardest of the two, prolly the 3, it's been awhile.

Junkyard Dog said:

I don't know, but I thought it was done with probes.

Pardon Our Interruption

and​

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Take tire Temps with a grain of salt for production cars. Carroll wrote about these in his prep/ tune/ drive to win series of books, but you have to remember he was an open wheel guy, and they have very sophisticated and extremely limited ( 2 inches, like a prototype). Because of this the information is not transferable. You can measure across the tread in an LMP car and see if the tire is over, or under inflated, not so much with a production car, here's why.
The production car has far more suspension movement, the old Phoenix S197 Mustangs were the gold standard and their suspension would vary...maybe 10 inches? To make the stock suspension work you run a ton of caster, a bunch of camber and it varies across the travel, especially toe in. Basically what happens is the car runs down the straight on its inside 30% of the tire, then hard braking and across the center 30% and onto the outer 30% through the corner. So the tire will roll over its center 30% making it appear that it is under inflated because it lives on the inner n outer 60% for most of its life. The temps will reflect that, it's very common to have a cooler temp in the middle, the tire is not under inflated. We went down a rabbit hole recently where the operating range of the tire was 175 degrees and above. So checking tire temps resulted in use jacking the pressure to get to that 175..well bollocks to that!! The car got worse n worse, the answer was not tire pressure, but rather car setup, the setup was not allowing the tires to get to the operating temp.
Tires mask everything, a few years ago we were running around 10 place in practice, I dumped a huge, but not shareable amount of psi in the tire, told the driver to find a hole and that he had 4, maybe 5 laps including outlaps to get it done on a new set of stickers, he did, started 4th as I recall. It was totally a demon tweak, when the race went green he dropped back to around 10th spot, which was expected. If he had not found a hole in the field he would've been toast, same with running over 5 laps, the tires would be way over pressured. We've also done similar things on late race to try and squeak out a few spots. I would imagine the temp probe would be having fits at this so don't bind yourself to the probe, it's a tool, and basically just another input to evaluate.

665.0coupe said:

How do you measure tire temp while the car is moving? Are there infrared temp sensors that are cheap enough for amateurs and weekend warriors to afford?

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It was meant as a joke, but yes, there are infrared tire temp sensor arrays - F1 teams use them. "Cheap enough" is a relative term.

Dave_W said:

It was meant as a joke, but yes, there are infrared tire temp sensor arrays - F1 teams use them. "Cheap enough" is a relative term.

Tire Infrared Temperature Sensors

Infrared sensors for measuring surface tire temperatures. Up to 16 Channels at 32Hz with object temperatures between -20 to 300˚C and data sent via CAN.

www.izzeracing.com

DIY stupidly cheap tire temp logger

DIY stupidly cheap tire temp logger

grassrootsmotorsports.com

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I knew that the sensors existed, but I didn't know if anyone outside of top tear race series used them. Apparently I missed the joke/sarcasm. Lol

Gunslinger55 said:

Stock pads are down to 5-6 mm so basically done

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Please do not forget to examine/photograph the back of the front and rear pads for us.

Nobody seems to know what the OEM brake pads are on the Dark Horse.

I am about to replace the pads and curious as well