Race Tracking Your Supra - Information exchange

[razorlab]

I've noticed a pattern that it's the V730. @Rensuhlo, @FLtrackdays, @rwense and now you.

@FLtrackdays wasn't a V730. Maxxis RC1

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[licklobster]

What is your pyrometer saying on tread temps on the inner band? That's the only diagnostic tool you need to tell you if your suspension is setup right for conditions. The 720s are real sensitive to overheating.

 

[licklobster]

Unrelated to the above discussion - anyone hit the big course with a set of Vitour P1s yet? On the short list for me to try. Heard good things.

 

[licklobster]

Well this was a 1st for any car I’ve owned…

Corded the inside left (driver’s side) tire. Granted I did a lot more in town driving than I usually do and busted an end link while driving at Sebring (turn 17). A button screw (they called it something else) came off on track.

Luckily a friend had extra parts (lug nut & spacers) in his truck and we matched up the thread size and pitch. Had to take the other side apart to do it ofc. Anyway, that has now been fixed. Verkline sent me the parts from across the ocean (took 4 ever). It was odd because the part came preassembled. So we asked them if they had a service bulletin or to start one.

Regardless noticed my tire yesterday when they were installing the replacement parts from Verkline ?. I’ve never corded on the inside. My camber is approximately -3.6 up front and we put some toe out, which I like. I had to emergency counter steer (scrub) under hard braking while slowing her down entering the turn. She was forced to go straight from 145 mph with that tire not being able to move until about 50 mph. I finally got enough small turns in to make it off track to the pit out (happens to be right there off turn 17 at Sebring).

I believe I did about 5-6 track days on those tires, 2 other weekends. I knew this would be the last 3 days (weekend) on them and brought my backup set. I did get a full day Friday before this happened. It was an all you can eat (drive) buffet style track day, so I did put in a LOT of time. But I’m having a hard time believing this happened from that end of day incident.

Any ideas or thoughts on to why I corded on the inside? I didn’t get a chance to talk to the head mechanic yesterday when I picked up the car. I’m thinking it couldn’t be too much negative camber. I know Guthrie, Bob, Bryan and many other peeps runs with just as much or more neg camber than I do and drive just as hard (fast) or harder w/out cording there 1st. I’ve always corded on the outside 1st when looking for tire wear. In fact I was really happy to see (or think) they were wearing much better, lol. I’ve got replacement tires but now it’s getting a bit late for me to go back out ?. I might do a day with Chin just to try out the new seat again in a few weeks. My times were off that day and something felt off. I should have known just to throw in the towel and check under the car sooner. Hindsight is always 20/20.

If anyone else needs the entire Verkline catalog diagrams for our Supra, see below for what they sent me. The Stateside company is a middleman for the main company over in Europe.

https://drive.google.com/drive/folders/1bEiiArbMPhojfa_vtYBemcDk9GCau7bb

I‘ve got all their parts except the bushings and subframe, been happy otherwise ?. I’m currently working with them figuring out why this preassembled part came undone. Will let y’all know what we find out and/or hopefully a service bulletin will follow.

Camber + toe = heat (scrub). What did your pyrometer say?

 

[razorlab]

What is your pyrometer saying on tread temps on the inner band? That's the only diagnostic tool you need to tell you if your suspension is setup right for conditions. The 720s are real sensitive to overheating.

Those are 730, not 720's. Very different tire. Def not sensitive to over heating.

 

[Evolution]

I think I am going to cord the outside of my RE71RS after my next event (5th one I think). Sad thing is they have like 70% tread left in the center.

 

[licklobster]

Those are 730, not 720's. Very different tire. Def not sensitive to over heating.

All tires are sensitive to overheating, eventually.

Without pyrometer readings its kind of a moot discussion and he probably should buy a pyrometer.

 

[razorlab]

All tires are sensitive to overheating, eventually.

Lol, of course, but that isn’t what you stated.

 

[licklobster]

Lol, of course, but that isn’t what you stated.

Sure, but it's clear conjecture given the original post didn't include any discussion of actual tire temps taken leads me to assume there were none taken and it's pointless trying to solve the "mystery" of inner tire wear when...

...it's temp related.

People, buy a pyrometer. It's one of the more useful tuning tools.

 

[razorlab]

Sure, but it's clear conjecture given the original post didn't include any discussion of actual tire temps taken leads me to assume there were none taken and it's pointless trying to solve the "mystery" of inner tire wear when...

...it's temp related.

People, buy a pyrometer. It's one of the more useful tuning tools.

Alright buddy, you know everything. Bow to the master.

Nice deflection though.

/ignore

 

[licklobster]

Alright buddy, you know everything. Bow to the master.

Nice deflection though.

/ignore

There is no deflection. The conversation starts and ends with pyrometer readings. Instead of choosing to contribute to searching for the cause of the unexpected wear, you chose to attack me. I don't know why you're looking for a way to prove you're a man child but I guess I can't stop you.

/unbothered

 

[FLtrackdays]

...it's temp related.

People, buy a pyrometer. It's one of the more useful tuning tools.

You’re right. Had I thought something had changed and I was still making alignment changes, I should have done that. And it wouldn’t hurt going forward, measure, looking for even temps across the tread… I’ve done it in the past when 1st setting up a car. However, I’ve been mega happy with my current setup & only outer wear. We have been slowly adding more neg camber. My last set of tires wore more evenly than ever on this same setup. The shop I’m using has been really good at making adjustments from my feedback. They drive on Sebring all the time.

My thought was that the suspension components (end link) likely altered the alignment settings under load, shifting the wear pattern from outer to inner. Who knows… I need to talk to the head guy (I’ve been mega busy and gotta run to work as we speak/type). Hindsight is always 20/20. I might need to do that going forward if he recommends it.

 

[romanLegion9574]

Yall got me worried now

I've noticed a pattern that it's the V730. @Rensuhlo, @FLtrackdays, @rwense and now you.

 

[romanLegion9574]

Got a rare nice April day so got out to the Ridge. GT7 seat time really helped; found 3 seconds and at a new PB.

I also got the Garmin Catalyst set up, and it’s pretty good and really easy to set up. Makes it easy to see where I can find some time. I’ll post a more detailed review later.

 

[licklobster]

You’re right. Had I thought something had changed and I was still making alignment changes, I should have done that. And it wouldn’t hurt going forward, measure, looking for even temps across the tread… I’ve done it in the past when 1st setting up a car. However, I’ve been mega happy with my current setup & only outer wear. We have been slowly adding more neg camber. My last set of tires wore more evenly than ever on this same setup. The shop I’m using has been really good at making adjustments from my feedback. They drive on Sebring all the time.

My thought was that the suspension components (end link) likely altered the alignment settings under load, shifting the wear pattern from outer to inner. Who knows… I need to talk to the head guy (I’ve been mega busy and gotta run to work as we speak/type). Hindsight is always 20/20. I might need to do that going forward if he recommends it.

Stuff slips, bends, breaks also. Often even temps aren't possible because you're always turning one direction, although that's always ideal of course.

What is possible, however, is logging consistent trends with your tread temps at different tracks under different conditions and also preventing excessive temps from destroying your tires. The pyro will tell you if you need to make a spot adjustment or if something has changed that you weren't necessarily aware of. A tuning tool.

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