[Chub2000]

Thank you . This is very helpful info as always!!

[glamcem]

Originally Posted by Provoste

No, they're a great track tire, but not a slick! I did get within 2.7 seconds of my time on slicks. This is really impressive, as the delta between RE71R/NT01 and slicks is about 5 seconds in the 3.2 mile config @ NCM. It means I can probably get in the 2:11-2:12 range on fresh take-offs. Those times are pretty rediculous for a non-aero street car.

wow that's huge, are you comparing them on the current configuration (car and tire sizes) or from previous experience on the other cars? I guess they might be same assuming the slicks run typically wider like the R7s. so 285 on slicks might be very close to 295s

5 seconds on 3.2 mile config should be still good about ~3 seconds in 2-2.5 mile tracks like our local tracks it should be the best bang for the buck mode alone. never had slicks before but I will probably try them at some point, if I ever get a towing vehicle and trailer (hopefully soon)

[TrackClub]

I am going the other way: from a track car, slicks and trailer to a DD/track set up. Chasing 2-3 seconds can be such a slippery slope financially
But as always there are pros and cons and it is nice to have choices.

[Provoste]

Originally Posted by glamcem

wow that's huge, are you comparing them on the current configuration (car and tire sizes) or from previous experience on the other cars? I guess they might be same assuming the slicks run typically wider like the R7s. so 285 on slicks might be very close to 295s

5 seconds on 3.2 mile config should be still good about ~3 seconds in 2-2.5 mile tracks like our local tracks it should be the best bang for the buck mode alone. never had slicks before but I will probably try them at some point, if I ever get a towing vehicle and trailer (hopefully soon)

The 5 second delta is about the same regardless of car, my friends who race PTE miata's see a 5 second delta from NT01/RE71R/RS4 to fresh R7/take off non-dot slicks, as does a good friend who has a GT4 sees 5 second delta from the OE Cup 2's to PZero take off slicks. It's the largest delta of any track I've driven, I too was skeptical until I saw the proof.

I had never run slicks myself until the Camaro. I saw the potential tire bill of running through NT01's, R888R, Trofeo R's.... and decided to explore take off slicks as I can get a full set for $500, and they are crazy fast. My first set of Yokahama take offs were great initially but they are an older school compound that are great... until they aren't. Very heat cycle sensitive. I'm planning to run Pzero slicks in the future as they are a new design, less sensitive to heat cycles and grip till they cord.

[TrackClub]

Pirelli DH are likely the best choice for a heavy car as far as slicks go. Really too bad BFG R1 doesn't come in larger sizes as that tire is super fast and lasts forever.

[seanblurr]

Have you considered oil starvation issues with slicks? I'd be curious if this car would start to run into issues with such grippy tires.

[TrackClub]

I believe Provoste did some testing on slicks...yet it could very well be track dependent in terms of how long a high G lasts in a corner.

[Provoste]

Originally Posted by seanblurr

Have you considered oil starvation issues with slicks? I'd be curious if this car would start to run into issues with such grippy tires.

Yes, that was my primary concern also. My first outing, I first did a baseline run on RE71R to get data at that track, then switched to slicks on the same day and did a couple very short sessions. Enough to get more than just one session of data, but short enough to not cause damage if there was an oiling issue. My minimum oil pressure dropped .7% from RE71R's to slicks, if i remember correctly my minimum oil pressure on RE71R's was 30.5, and on slicks it was 29.7. I was very happy with this result. Thank god for PDR, such an unbeleiveable resource for questions like this. I've only run the slicks on two tracks: NCM MSP and Putnam and both showed about the exact same delta in oil pressure.

[TrackClub]

Provoste, what track venue did you test at pls?

EDIT: just saw the track names so pls ignore my question

[seanblurr]

Originally Posted by Provoste

Yes, that was my primary concern also. My first outing, I first did a baseline run on RE71R to get data at that track, then switched to slicks on the same day and did a couple very short sessions. Enough to get more than just one session of data, but short enough to not cause damage if there was an oiling issue. My minimum oil pressure dropped .7% from RE71R's to slicks, if i remember correctly my minimum oil pressure on RE71R's was 30.5, and on slicks it was 29.7. I was very happy with this result. Thank god for PDR, such an unbeleiveable resource for questions like this. I've only run the slicks on two tracks: NCM MSP and Putnam and both showed about the exact same delta in oil pressure.

That's good to hear. I'm unfamiliar with those two tracks, any long sweepers?

[Provoste]

Originally Posted by seanblurr

That's good to hear. I'm unfamiliar with those two tracks, any long sweepers?

Yes, the National Corvette Museum MSP has a number of high speed right hand sweepers and then a very tight, very long constant radius uphill left-hander that used to give my Boxster S a really hard time with it's oiling system (flooding my OE catch can/Air oil separator). Putnam Park has a couple similar corners that give oiling systems a hard time.

[TrackClub]

Prolonged fast L handers seemed to have expired many an LS7 without track oiling mods. It seems the Camaro team really tweaked this LT1 for better oiling and hence no need for a dry sump even for track duty. This motor is starting to look like a new version of LS6: simple and stout.

[glamcem]

Originally Posted by Provoste

The 5 second delta is about the same regardless of car, my friends who race PTE miata's see a 5 second delta from NT01/RE71R/RS4 to fresh R7/take off non-dot slicks, as does a good friend who has a GT4 sees 5 second delta from the OE Cup 2's to PZero take off slicks. It's the largest delta of any track I've driven, I too was skeptical until I saw the proof.

I had never run slicks myself until the Camaro. I saw the potential tire bill of running through NT01's, R888R, Trofeo R's.... and decided to explore take off slicks as I can get a full set for $500, and they are crazy fast. My first set of Yokahama take offs were great initially but they are an older school compound that are great... until they aren't. Very heat cycle sensitive. I'm planning to run Pzero slicks in the future as they are a new design, less sensitive to heat cycles and grip till they cord.

Do you buy them online? It seems like they have 305 and 325 sizes on 19" wheels but not sure about the sidewall (percentage)

Originally Posted by Provoste

Yes, that was my primary concern also. My first outing, I first did a baseline run on RE71R to get data at that track, then switched to slicks on the same day and did a couple very short sessions. Enough to get more than just one session of data, but short enough to not cause damage if there was an oiling issue. My minimum oil pressure dropped .7% from RE71R's to slicks, if i remember correctly my minimum oil pressure on RE71R's was 30.5, and on slicks it was 29.7. I was very happy with this result. Thank god for PDR, such an unbeleiveable resource for questions like this. I've only run the slicks on two tracks: NCM MSP and Putnam and both showed about the exact same delta in oil pressure.

It seems like they did a good job on baffling. Maybe that and the combination of using bigger oil pan helps on oiling.
Have you been using Cosworth toolbox for data analysis or another software?
Thanks again

[Provoste]

Originally Posted by glamcem

Do you buy them online? It seems like they have 305 and 325 sizes on 19" wheels but not sure about the sidewall (percentage)



It seems like they did a good job on baffling. Maybe that and the combination of using bigger oil pan helps on oiling.
Have you been using Cosworth toolbox for data analysis or another software?
Thanks again

No, I've used JB Racing to source my take-offs. Yes, few options in 19" take offs, but they do now have a steady supply of 305/690 19" PZero slicks that would likely work on a 10.5 or wider setup. The OD on the 305/690 is 27.33, so only .1 larger (0.47%) OD on the rear, .53 larger (1.97%) OD on the front. The 305/690 PZero slick is the rear tire from the Ferarri Challenge series.

I'm running 18" take offs simply because there is always a selection of take-offs in 18's, and I like the lower weight and gearing advantage. Plus my buddy gave me the wheels for almost nothing! If I were buying another set of wheels, I'd get the 19 x 10.5 et22 and run square 305.

Yes, I'm using the Cosworth Toolbox. I had no idea how much tech was built into the PDR package before I purchased my car. I've pulled up my laptop after a session and reviewed the data with some of my track buddies... they couldn't believe it.