Track forum general chit chat.

[gmx]

Originally Posted by rhyary

I have lap times to correlate to my statements.
But, non of it is scientific so take it as observation.

For example, with the RR 235, I was easily doing multiple 1:37 on multiple sessions through out the day throughout the season.

On the ADOR8, while my fastest time is 1:37.2, most of the laps were 1:38-39 and only few sessions in the fall when it was cooler.

Because AD08R is still a road tyre and only good for 1 hotlap, maybe 2 if the suspension is setup correctly. All the WTAC teams run this as a control tyre and throw them out after 1HC or only keep scrubs to dial in setup. They lose peak grip but are consistent either down to cords or until HC out unlike Hankook RS4 which gradually lose grip each HC.
My 295s HC'd out (heaps of roll racing). My 285s did 1 wet session at WTAC :winning.
I really don't understand why people try do "endurance" sessions on AD08Rs/RS4 and even RE71R. Good way to kill them and not get much out of them as a result.

Originally Posted by rhyary

With PS4S 275/30/19 front I did 1:38 on semi wet track. So it is fantastic tire, but not compares to RR and R7 in the dry

Yes, people run these before the cross-over to dry tyre. It has a soft sidewall so your temperature spread between inner, centre, outer will be different compared to the others.

You're not getting the most out of RR/R7 if your time is the same as AD08R. Yoko's next step, the A050 is at least 0.7sec quicker than fresh AD08R. RR/R7 are another big step above that man.

See video of my scrubbed AD08Rs: There is an obvious behaviour change on the second lap.

Use a probe, start noting down surface temps and other track conditions, tyre temps, laps etc. You collect data for other aspects of your own driving, right? May as well grab this stuff otherwise it's pew pew in the dark or purely based off feel.

[roastbeef]

i have actually dismissed the idea of a probe. if listened to a few podcasts/webinars and talked with people at the track and a really nice garage neighbor that let me play with one. the general consensus is you have to work up to a hot lap, but not get sloppy to intentionally overheat the tires, then come in the pits hot, and immediately probe the tires. otherwise, the tire carcass absorbs and begins to blur the surface temperature differences. from what i have found, you really have to have someone waiting for you to jump out and probe the tires as soon as you come in, rather than after your cool down lap, park, take it out of the case...

[Richbot]

Just leave it on the pit wall and get out and do it mid session

[rhyary]

Originally Posted by roastbeef

i have actually dismissed the idea of a probe. if listened to a few podcasts/webinars and talked with people at the track and a really nice garage neighbor that let me play with one. the general consensus is you have to work up to a hot lap, but not get sloppy to intentionally overheat the tires, then come in the pits hot, and immediately probe the tires. otherwise, the tire carcass absorbs and begins to blur the surface temperature differences. from what i have found, you really have to have someone waiting for you to jump out and probe the tires as soon as you come in, rather than after your cool down lap, park, take it out of the case...

I agree.
It is really hard to get valid data without onboard telemetry and a pit crew.

[gmx]

Make friends with someone in another run group and do it for eachother

[dparm]

Critique my tire wear/alignment.

Front camber: -2.4
Front toe: 0
Front caster: 7.0

Rear camber: -2.0
Rear toe: 0


I tried to have these rotated after every track day but that really just means swapping the entire tire/wheel from one side to the other on the same axle, which still keeps the outside on the outside. I shoot for 34-35psi hot which is 27-28psi cold.

I also put about 5,000 street miles on them in this time. Note that MSR Cresson has a lot of left turns, if you aren't familiar.

7/19/19: COTA, 98 degree ambient, 88 minutes on track
9/17/19: MSR Cresson 1.7 CCW, 94 degree ambient, 54 minutes on track
9/28/19: MSR Cresson 1.7 CCW, 95 degree ambient, 154 minutes on track
9/29/19: MSR Cresson 1.7 CCW, 95 degree ambient, 72 minutes on track
11/17/19: MSR Cresson 1.7 CCW, 66 degree ambient, 87 minutes on track

(total track time = approx. 453 minutes)

[fsmtnbiker]

You'll get plenty of opinions based on tire wear, hard to say with the 5000 street miles. The front inside edges are definitely worn from that driving. The rear tires look like they'd be happy with 2-3 psi less hot. I personally would bump up the camber on both ends by a bit, but if you're going to continue street driving the car as well its just going to wear the front insides out quicker. Overall the wear looks reasonable given the driving you've done.

[roastbeef]

not bad at all. like fsmtnbiker said, take a few pounds out of the rear. fronts look nice, no cupping or anything weird. might be able to do slightly more camber, but overall, looks pretty healthy- especially if you're happy with how she drives.

[dogbone]

Originally Posted by dparm

Critique my tire wear/alignment.

Front camber: -2.4
Front toe: 0
Front caster: 7.0

Rear camber: -2.0
Rear toe: 0

In the world of M3's, I've always heard that a bit of Rear Toe In helps with braking stability. Do Corvettes benefit from that too? Or no?

[M3 Number 86]

Originally Posted by StripclubDJ

As for cost , obviously not cheap
But with the amount of time it takes me to pay attention to littlest of details nobody cares about, it's a bargain in my eyes

Don't tell me that's Ed's lol

[StripclubDJ]

Originally Posted by M3 Number 86

Don't tell me that's Ed's lol

Mike

[M3 Number 86]

My car turned significantly better with the more tire I had in front.

Is your M3 rear engine? Lol

[M3 Number 86]

Originally Posted by dogbone

In the world of M3's, I've always heard that a bit of Rear Toe In helps with braking stability. Do Corvettes benefit from that too? Or no?

I think overall stability. I've never seen anyone with zero toe in the rear!!

[M3 Number 86]

Originally Posted by dparm

Critique my tire wear/alignment.

Front camber: -2.4
Front toe: 0
Front caster: 7.0

Rear camber: -2.0
Rear toe: 0


I tried to have these rotated after every track day but that really just means swapping the entire tire/wheel from one side to the other on the same axle, which still keeps the outside on the outside. I shoot for 34-35psi hot which is 27-28psi cold.

I also put about 5,000 street miles on them in this time. Note that MSR Cresson has a lot of left turns, if you aren't familiar.

7/19/19: COTA, 98 degree ambient, 88 minutes on track
9/17/19: MSR Cresson 1.7 CCW, 94 degree ambient, 54 minutes on track
9/28/19: MSR Cresson 1.7 CCW, 95 degree ambient, 154 minutes on track
9/29/19: MSR Cresson 1.7 CCW, 95 degree ambient, 72 minutes on track
11/17/19: MSR Cresson 1.7 CCW, 66 degree ambient, 87 minutes on track

(total track time = approx. 453 minutes)

34/35 always seem too hot for me. Looks like the rears could come down some with wear more in the middle due to over inflation?

The edit: passenger front side I can't tell if anything is wrong but on one tire it has a strange valley towards the outside. For me I experienced that when I had blown suspension but since it's a new car it's most likely not that. But are the surfaces shitty at the track and is the wheel stuttering up abs down a lot? Maybe it's just pushing.

[kyoo]

thought i'd share the latest oil report. includes 3 track days a few autoxes. All on redline's 50wt racing oil. I did the TBN as I was curious how bad it would be, but not bad at all. Easily a 3k mi oil change, which is what a lot of people run for OCIs anyway. Still, the motor looks very strong.

Looks great, but toying with the idea of selling the car...

[dparm]

Originally Posted by M3 Number 86

34/35 always seem too hot for me. Looks like the rears could come down some with wear more in the middle due to over inflation?

The edit: passenger front side I can't tell if anything is wrong but on one tire it has a strange valley towards the outside. For me I experienced that when I had blown suspension but since it's a new car it's most likely not that. But are the surfaces shitty at the track and is the wheel stuttering up abs down a lot? Maybe it's just pushing.

It's probably more related to the specific track I spent a lot of time at. It's hard on that side of the car. Also, that "shaving" look is probably caused by the tire being laterally dragged in some turns. My factory MPSS and MPSC2 did it too. I was able to reduce it with some pressure adjustments at Fall-Line's advice.

[OG Shark]

Has anyone run in BMW CCA Club Racing. Eyeballing one of their races next year in the B Modified class. Curious what I would be getting myself into...

[CorruptCommie]

Originally Posted by OG Shark

Has anyone run in BMW CCA Club Racing. Eyeballing one of their races next year in the B Modified class. Curious what I would be getting myself into...

Trying to do the school this year, but won't be doing any BMW CCA club racing. Maybe AER/WRL seats.

[///Mobbin]

Originally Posted by OG Shark

Has anyone run in BMW CCA Club Racing. Eyeballing one of their races next year in the B Modified class. Curious what I would be getting myself into...

I watched a BMWCCA club race at COTA while I was participating in an HPDE there the same weekend. Looked fun! That's all I have, hah.

[OG Shark]

Originally Posted by CorruptCommie

Trying to do the school this year, but won't be doing any BMW CCA club racing. Maybe AER/WRL seats.

Had a lot of fun in the WRL race at COTA in a M240iR a couple of weeks ago. Going to run AER at Watkins Glen in May

If I do run in it will probably just be a one and done - kind of just want to see what it is all about. Not sure how well the car will fit into that class though with our build plans.

Originally Posted by ///Mobbin

I watched a BMWCCA club race at COTA while I was participating in an HPDE there the same weekend. Looked fun! That's all I have, hah.

Ha nice - I'm in it for the lol's so good to hear it looked fun! This would be at COTA but doesn't sound like they are going to run a HPDE with it. Also doesn't sound like it is set in stone yet either - think they are wanting a certain number of entries by the end of the year before finalizing the whole thing.

[Kelse92]

Originally Posted by OG Shark

Ha nice - I'm in it for the lol's so good to hear it looked fun! This would be at COTA but doesn't sound like they are going to run a HPDE with it. Also doesn't sound like it is set in stone yet either - think they are wanting a certain number of entries by the end of the year before finalizing the whole thing.

If it's anything like the club race recently held at Hallett coordinated by the three chapters that put on the HPDE weekend, it should be a blast! I'm somewhat involved in the Lone Star chapter and I know they're really trying to grow the CCA races more. Seems to be LOTS of BMW's competing in WRL etc, but for some reason none really get run much at the club level in TX. Only had 10 or so racers at Hallett.
If you are considering it, I would say at least just do the initial sign-up to show you're interested as I don't think there's an immediate financial obligation. The most recent event was well run and this one sounds like it should be great if it gets finalized.

[bigjae1976]

Originally Posted by Kelse92

If it's anything like the club race recently held at Hallett coordinated by the three chapters that put on the HPDE weekend, it should be a blast! I'm somewhat involved in the Lone Star chapter and I know they're really trying to grow the CCA races more. Seems to be LOTS of BMW's competing in WRL etc, but for some reason none really get run much at the club level in TX. Only had 10 or so racers at Hallett.
If you are considering it, I would say at least just do the initial sign-up to show you're interested as I don't think there's an immediate financial obligation. The most recent event was well run and this one sounds like it should be great if it gets finalized.

It's interesting...but you need more than 1.5 races per year.

Worse this year is the MSR date conflicts with the PCA/BMWCCA tag along real at COTA.