Matt Romanowski

Mark, you're making this tedious. Yes, the sensors measure internal tire air temp. Yes, they have a sensor just for that. Yes, some are influenced by rim temp, many are not. I have no idea what Paul has access to. I'm talking from my direct experience and data I have seen. I am friends with a bunch of DAGs that have this data from many teams, levels of racing, and different cars. I am also friends with the people that instrument cars for the tire companies and do the tire testing.

I know all about track temps and it's influence on asphalt and it's grip. I have an IR sensor on my car aimed at the track. I can tell you all about how high they get, where they get it, and what it does to grip levels (in general). Different asphalt mixes perform differently at different temps.

Matt Romanowski

And here is a link to the McLaren sensor specs https://www.mclaren.com/appliedtechn...tpms-ir-array/

mark kibort

Hey, its just a discussion. was curiious as how an internal air temp meter could be accurate. remember, the air temp in the tire, is going to be distributed . You said you know about track temps, then why id you seem to be surprised to here of our 140F track temps mentioned at Thunderhill and Laguna last year? yes, and i think we all know about track temps effecting grip.

sounds like a thermistor.. which would be heavily influenced by rim temps. For purposes of racing, ideal! For this discussion. probably not accurate to predict tire pressure.

jdistefa

I'd recommend a rectal thermometer.

Matt Romanowski

Is that real Mercury or the fake new stuff? Digital? Medical or motorsports opinion?

Lube or no lube?

morsini

My racing record stands for itself, it's probably a fare bit better than yours. I've seen your videos too, and you always seem to be holding onto a piece of your car. When are you going to fix that piece of ****? You still haven't answered my question. I know, I know. You don't think anything's wrong with you - it's the rest of us who aren't right.

Everyone prepare for the next graph of why Mark shouldn't have to take his meds.

mark kibort

Mike, you are delusional. ahhh you dont have a racing record.. Funny, my piece of "xxxx" car is about 10 seconds a lap faster than yours, and 10 years older! Now, if it needs "fixing" what needs to be fixed.?? after all you are the expert. After you knock off a few seconds off your lap times, come back and then pop off. Right now, driving a beautiful 993 at Miata lap times is nothing to be proud of or boast about.
i ask a valid question and suddenly you are a doctor? You act like someone that has a few metal defective issues. Again, crawl back under that rock from which you came. this is a place to talk about cars, not your personal mouth diarrhea dump ground

Now, here is a reality check for you. You are 10 seconds slower a lap, You dont run the Hoosiers in the sizes we are talking about, you have absolutely nothing to contribute, but when you do, please get off your knucklehead 8th grader/internet bully rampage and try and contribute something constructive, or just go away. in other words............ grow up!

Rick

Difool

Jabs1542

mark kibort

Rick Here is what is sad....., dont be a small man... Look, it's clearly Mike and his inadequacies posting and d-railing. HE STARTS at POST #20.... all i asked was how those temps were see by a Paul.... I also was giving my experience with about 30 sets this season with my group of racers buds of the same tire and size..... and your post is" on course"??

mark kibort

Haha ....It might be, but the fact that we have seen the same temp rise at Sonoma, Thunderhill, buttonwillow, willlow springs auto club speedway AND Road America, might work against that hypothesis.

are you running the same sizes as discussed here? 295, 315 or 335? How do your accross tire temps look? i know we all found that over 33psi, and the centers are hoter than both outside temp measuring points. at 30-32, it is progressive inner to outer about 5-8 degrees per section.

mark kibort

There is not one guy at the Runoffs that will run this tire at this high of pressure in the sizes we are talking about here.....90% of the drivers will be targeting for 30 to 34psi HOT

just curious. as all the T2 and a few of the T1 mustang guys are running this size and not seeing issues this past season. early on, they were 2017s, but later, were 2018 so i dont know if there were any changes. but, im still curious as to those edge wear patterns ,and the black rubbing marks on the fenders.... ive seen that plenty of times before due to rubbing. if it itsnt hitting the fender, what is that from? you really dont think that is contributing to the edge wear or that cracking?

again, i dont think his lower pressures are a factor here , I would think that the higher pressures might be an issue. the fact remains, most everyone running this size tire is running far below that is recommended by hoosier..... I do agree, that there is a wide spread of drivers on the tire and and some might not take care at 22-24psi during warm up to keep from damaging the tire.. but at 30-32psi seems to be the agreed best pressure range for long life and best grip in a variety of conditions. again, no one running in the front group of the runnoffs using this tire will be running 40+psi hot (according to Paul, and his 14psi temp rise), that would mean starting at 26psi starting.. in fact, if you use recommended 36psi starting temps... and Pauls 14psi pressure increase, you would end up at 50psi operating temps,, which IS over the "recommended" pressure...............so, what would anyone with the facts do here?

mmuller

I run the 315 tire. always start at 32 psi and cut my first session short to bleed down to 37-38 where they stay throughout the day. This is on a 996 GT3. My tires, at 38 psi, on my GT3 will allow the car to run 1:58 at WGI. I typically get 32-36 HC out of a set of Hoosiers and never have seen these wear pattern's.

And yes, I have seen a 14 psi change in a tire running at WGI before.

mark kibort

Interesting information. you start at 32psi and end up with 14ps (sometimes, as you have seen), which means 46psi? and then you bleed down from there? what kind of tread temps are you seeing in the hot pits? so,its also interesting you are running 38psi which is a full 6-8 lbs higher than anyone will be running on that tire and size at the runnoffs. (top 5-10 spots... and ill get data for you if you want). BUT the most interesting thing about your comment is that you get 32 to 36 heat cycles? Again, that is a statistic that I've NEVER heard , in fact almost an order of magnitude (or half that) higher than most see. i get 8-10 before the tires are junk. most people are tossing them at 6-7 heat cycles. Why do you think i get so many decent throwaway (used tires) i get them with 4-5 heat cycles? 32-36 heat cycles? really? are you talking about everytime you go to the grocery store, is a heat cycle?

as a note.. this is on the GT3, which is rear engine obviously and with the higher weight in the rear , this might effect pressure required . Are you also talking about your much smaller front tires too?

heck, maybe we *everyone i know* has it all wrong. illl try what you are doing for the first practice session and see how it feels. i have done this before, however.. i forgot to air down, tires were set at 30psi cold and i ended up at 38psi and the car was skaty as all heck........lowered to 32psi and things were back to normal... i think many here have done the same thing, especially the cars we are talking about . Vets, my car, mustangs, etc, that use this tire on all 4 corners.

so you are saying, a 3000lb , 1:58 car at WG can have tires that last a full 8 race season? that is amazing.