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M2 Technical Topics > Track / Autocross / Dragstrip > RE71 v RS4 v NT01 - what track tire do you run?

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      01-13-2019, 03:09 PM   #45
landapanda
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5 monster - consider going 265/35 and 285/35 on oem rims. This is as wide as you can go and can get re71r in this size. This is the setup I'll go for this summer.
Thanks man, I'd love to go that route! My issue is that it's tough in Germany to make ANY kind of mod. My registration states the tire size right on it (factory 245/265 setup) and a shop I took it too already told me that's the only thing they are allowed to put on it.

So I'd love to go wider, but I'd be happy with 255/275 if I can even pull it off.

P.S. For street dudty I wouldn't care, but 265 is right on the edge of what the tire mfg recommends. I'd be worried about sidewall rollover to be honest. I've seen the shoulder wear on my stock 255s and 275s on wider rims with my previous track car. They are not joking.
The acceptable rim width comes directly from the manufacturer. Most mfrs will state it's ok to go up to the sizes I mentioned in OEM rims.

Regarding your dilemma, I didn't realize German rules are that strict. I tracked the oem Contis and had plenty of fun on those. Wider tires will lead to faster time, but in the end who cares if you shave a second off your PB. You can probably do that by working with a good instructor, focusing on your brake markers, smooth cornering and a proper exit line!
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      01-13-2019, 03:21 PM   #46
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255/275 or 255/285 is they way to go for the track on stock rims, if they’ll let you do it in Germany.

265/35 on the stock 9” rim doesn’t net hardly anymore contact patch and introduces worse steering response and rollover on track. Really need a 9.5” rim for a 265 on track.

Plus, a new 265 is taller and will rub the fender liner under severe compression, which you’ll find on track.
This is exactly what I'm afraid of with going over mfg suggested width. If I were keeping the car I'd just shell out for wider rims, but I don't plan to be here more than 3 years. So I'm a slave to stock rims. But I'd be happy with 255/275 setup with track pads.

When I get back to the States I know exactly what car I want. It will be a Corvette Grand Sport. It comes with serious aero and 275/325 tires from the factory. Because Racecar!
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      01-13-2019, 03:29 PM   #47
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This is exactly what I'm afraid of with going over mfg suggested width. If I were keeping the car I'd just shell out for wider rims, but I don't plan to be here more than 3 years. So I'm a slave to stock rims. But I'd be happy with 255/275 setup with track pads.

When I get back to the States I know exactly what car I want. It will be a Corvette Grand Sport. It comes with serious aero and 275/325 tires from the factory. Because Racecar!
Hey, 255/285 RE-71R on OEM rims are faster than most everybody's track wheels and tires, so don't sweat it.

Those GS's are fast. I did a 20min session with my Stage 4 Dinan M2 and a buddy with a GS. We were neck and neck the whole time, and neither could pass each other.

It was interesting to see where each car was faster. I'd catch up under braking (probably the driver), he'd pull a tiny bit to midcorner (lighter car), I'd gain on corner exit (more torque), and we would be even down the straight until about 90mph where his more efficienct aero and slight hp advantage would kick in and he would start to walk away.

Was one of the most fun on track sessions I've ever had! The best part is I could put all my tires in my car & drive home w/o a trailer.
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      01-13-2019, 03:29 PM   #48
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The acceptable rim width comes directly from the manufacturer. Most mfrs will state it's ok to go up to the sizes I mentioned in OEM rims.

Regarding your dilemma, I didn't realize German rules are that strict. I tracked the oem Contis and had plenty of fun on those. Wider tires will lead to faster time, but in the end who cares if you shave a second off your PB. You can probably do that by working with a good instructor, focusing on your brake markers, smooth cornering and a proper exit line!
Ahhh, now you're teasing! I have a PB goal for Nurbergring Nordshleife BTG while I'm, here. 7:55 is the goal. I've tracked a Mustang GT for 5 years before this, and I know sidewall stiffness has a lot to do with driver confidence. And driver confidence has a lot to do with lap times. At some point tire width stops paying dividends on stock rims. I went wider with the Mustang thanks to wider rims, but I can't with the M2. I really think 255 will be my limit on the front.

But good point about driver mod. I was HPDE1 before in the Mustang, but the M2 is a different car. I definitely plan to have someone who knows what they are doing teach me the lines at Nordshleife and elsewhere before I attempt post worthy laps.
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      01-13-2019, 03:37 PM   #49
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Originally Posted by ZM2 View Post
Hey, 255/285 RE-71R on OEM rims are faster than most everybody's track wheels and tires, so don't sweat it.

Those GS's are fast. I did a 20min session with my Stage 4 Dinan M2 and a buddy with a GS. We were neck and neck the whole time, and neither could pass each other.

It was interesting to see where each car was faster. I'd catch up under braking (probably the driver), he'd pull a tiny bit to midcorner (lighter car), I'd gain on corner exit (more torque), and we would be even down the straight until about 90mph where his more efficienct aero and slight hp advantage would kick in and he would start to walk away.

Was one of the most fun on track sessions I've ever had!
Thank you for this! I will see if I can bribe someone to help me with this setup on the M2

I have some experience with the Vettes. Best bag for the buck at any track. Been my dream car for a while. When in Germany I will do like the Germans do. But when I'm back stateside I will have a GS. I've seen them walk on 911s at various tracks near Great Lakes. So now it's a Life Goal.
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      01-13-2019, 04:06 PM   #50
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Originally Posted by ZM2 View Post
Hey, 255/285 RE-71R on OEM rims are faster than most everybody's track wheels and tires, so don't sweat it.

Those GS's are fast. I did a 20min session with my Stage 4 Dinan M2 and a buddy with a GS. We were neck and neck the whole time, and neither could pass each other.

It was interesting to see where each car was faster. I'd catch up under braking (probably the driver), he'd pull a tiny bit to midcorner (lighter car), I'd gain on corner exit (more torque), and we would be even down the straight until about 90mph where his more efficienct aero and slight hp advantage would kick in and he would start to walk away.

Was one of the most fun on track sessions I've ever had! The best part is I could put all my tires in my car & drive home w/o a trailer.
You sound like a pretty experienced driver, and this alone is huge in terms of lap time. More than huge, actually. But I am curious, what is the TQ of a Dinan Stage 4 tuned M2?

The Vettes has 460tq from the factory, and I think this figure is actually underrated. Those 6.2L V8s are power houses.
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      01-13-2019, 04:32 PM   #51
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You sound like a pretty experienced driver, and this alone is huge in terms of lap time. More than huge, actually. But I am curious, what is the TQ of a Dinan Stage 4 tuned M2?

The Vettes has 460tq from the factory, and I think this figure is actually underrated. Those 6.2L V8s are power houses.
Looks like you’re right, the Chevy’s torque is definitely better in the upper RPM’s:
https://www.chevrolet.com/corvette-life/engines
https://www.dinancars.com/product/d4...or-bmw-f87-m2/

I haven’t looked at American V8 performance in quite a while, and assumed torque was worse than a direct injection turbo motor. Looks like the Stage 4 wins down low, but not up top. Nice work, Chevy!

So, I guess I was just getting on the gas harder & quicker, and myself in a GS would smoke myself in a heavily mod’ed M2.

Altho, I’m running BM3 now, which is putting out 460hp/485ft-lbs on the BMW Sport Dials, so that’d be a more even match. And, the M2C guys running just BM3 Stage 1 are close to 500hp, but we can only get 295/305 max rubber in the back, so we’re more traction limited than the Vette.

No doubt the GS is track car to have! Altho, I can either throw wife/kid/dog or track tires in the car, so there’s that.

PS. We’re severely off topic! Hah.
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      01-13-2019, 09:35 PM   #52
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On my 17 M2 I'm running the following tire and wheel setups:

1. Winter = square Michelin PA4 snow tires 245/40-18.

2. Track = staggered Hankook RS4 245/40-18 front and 265/40-18 rear.

3. Summer = OEM = staggered 19" Michelin Pilot PS4s 245/35-19 front and 265/35-19 rear.
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The RS4s are great. Long lasting. Super stiff sidewall. Ok, but certainly not great in the rain. It is the best tire for me. It is relatively inexpensive and it certainly wears much better and longer than the RE71Rs.
Thanks Rich, good stuff. This setup sounds similar to what i'd like to do, though my preference would be to go slightly wider for track duty.

In my present situation I do not want to to buy/store additional rims (no garage, just 3 parking spots in front of the house) so I'm leaning towards 255/35-19 front ans 275/35-19 rear. This way I keep the factory understeer/oversteer characteristics by keeping the contact patch ratios the same, and it should fit on factory rims.
Sounds good. My goal in going with the staggered 18" setup was to:

1. Prevent rubbing issues since I don't plan on modifying camber or doing any other suspension mods.
2. Maintain the OEM 19" tire revolutions per mile since the OEM front and rear tire height is different. My 18" setup maintains an exact (or near exact) tire height compared to OEM 19's.
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      01-13-2019, 11:01 PM   #53
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Various tire specs by: Tire/size/section width/tread width/diameter/revs per mile

OEM PS4S
245-35-19/ 9.8/8.6/25.8/807
265-35-19/10.7/9.6/26.3/790

OEM Conti
245-35-19/ 9.8/8.7/25.8/805
265-35-19/10.7/9.4/26.3/790

RE-71R
255-35-19/10.2/. 9.3/26.0/801
275-35-19/10.9/10.0/26.6/784
265-35-19/10.7/.9.6/26.3/791
285-35-19/11.4/10.1/26.8/775

18" Hankook R-S4
245-40-18/10.1/9.1/25.6/811
265-40-18/11.0/9.7/26.2/793

Notes:

1. Section width and tire diameter can create rubbing issues.

2. Taller tire diameter with lower revs per mile impacts gearing and speedo accuracy.
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