Is anyone having issues with front tires at the track?

[MRakete]

Originally Posted by Captain Unknown GT4

Here is my left front tire. Car is now don 4500km on these tire. First 2000km easy street. Then ap. 12 laps on mid city street circuit. And ca. 1500km drive to Nurburgring then 4 laps at ca. 7.30 btg speed and 6 laps 8+min btg speed in plenty traffic. Then 20 wet laps on SPA and 20 dry laps SPA. (2.45-2.50min laps dry)

Total cars is 4500km now and most street driving then.
Looking outer edge I see I could use more negative camber as outer edge is wearing out. Still I must say wear is pretty even, I also get that section in middle to wear out. Still compared to my GT4 Porsche the tire is gipping much better front and I feel no understeer in GTS on them tracks. Also tire wear out much faster on my Porsche GT4 at nurburg as I feel much understeer there in GT4. No understeer in GTS on Nur or SPA.

I would recomend to not driving wrong tire pressure as It will wear out tire even faster. Front hot 2.3bar rear hot 2.1bar is sweetspoot, also sport auto drove that pressure on long fast nurburing and short GP layout hockenheim.
Also keep within 70-90 degrees temp inside tire, see car navi display as this is importent. Cup 2 optimal driving range on track is between 70-90 degrees. You kill tire if way past that, hence abuse understeer or wrong tire pressure will cause that its hard to stay between 70-90 degrees. Stop driving if shoting to much heat to tire due to abuse understeer drivingstyle or wrong pressure. Tire will get killed and you will not drive fast laps if 100+ temp. Also it only take a few laps on wrong temp and pressure to destroy a tire.

I always drive whit screen display tire inside temp and pressure, very importent as this car is porky. If bits and pice fall off cup 2 tire, then you did wrong, not the car or the tire.

As porky car its importent to in between laps on track pick a few cooldown laps. (Very much depending on what speed one have in the first place)

Thanks for sharing. What are you running for camber and toe settings.

[Captain Unknown GT4]

I have not check that, car is fully stock and now Its lowdown GP track setting. No need for alignment when you go from high soft street setting - to low hard GP track setting and back again. That is one of the best developed things with GTS. Then again if you go past these 2 default settings(street=nubrugring and street setting, and low GP setting) tested out by M, you might need alignment?!

[Rasya]

Originally Posted by Captain Unknown GT4

I have not check that, car is fully stock and now Its lowdown GP track setting. No need for alignment when you go from high soft street setting - to low hard GP track setting and back again. That is one of the best developed things with GTS. Then again if you go past these 2 default settings(street=nubrugring and street setting, and low GP setting) tested out by M, you might need alignment?!

How long does it take you to switch from track to street? What tools do you use?

[Captain Unknown GT4]

30-50min for a race shop. Its like very easy and easy instructions to follow in GTS track book.

Manthey / Raeder racing down at Nurburgring did mine.

[jml]

Some tire options. I wouldn't run R7s until we can get the camber over -2.5.

[MRakete]

Originally Posted by jml

Some tire options. I wouldn't run R7s until we can get the camber over -2.5.

Attachment 1546565

I am going to try re71r's , 275 front and 295 rear with camber plates.

-3 in front with a tad of toe out and -2.5 in rear with 1/16 toe in.

[jml]

Originally Posted by MRakete

I am going to try re71r's , 275 front and 295 rear with camber plates.

-3 in front with a tad of toe out and -2.5 in rear with 1/16 toe in.

That seems like the setup to get, 295/30/20 and 275/35/19

[larryn]

For what it is worth, On the track I get double the wear from the rear tires than the front (NT01s). Then again, I found that running 275/305 staggered worked well for me, and CanAutM3 and I run the exact same setup, except I have the GC coilover conversion, where he has springs to lower. I also do have the Dinan S2 tune, intake and exhaust. So similar power is probably being put down.

Lastly, I've seen tires that were overcooked by the driver that look remarkably similar to those. Are you plowing into the corners (going into corners too hot)? Physics still takes place, even on the GTS.

[MaynardZed]

Originally Posted by johnr265

Not a fan of R888. Very peaky tire with grip falling off quickly. I like the Trofeo R on the track but it is a pretty ridiculous street tire. If you plan to change to a different combo for the street, should be a nice option.

I think if I were going a dedicated set of rims, I'd do Hoosiers. How about 265/35/19F and then for rear choices are:

295/30/19 (-2.6% diameter)
315/30/19 (-1.1% diameter) huge but rear is sometimes more flexible
295/35/19 (+1.5% diameter)

For the price I'd still go with R888(R) over the Trofeo. You can get 15-25 HC out of a set before they really get slippery. The sidewall is really tough on them, so you shouldn't have the outside shoulder chunking issue you'd have with the michelin tires. They are pretty crappy on the street though.

[CanAutM3]

Originally Posted by MaynardZed

For the price I'd still go with R888(R) over the Trofeo. You can get 15-25 HC out of a set before they really get slippery. The sidewall is really tough on them, so you shouldn't have the outside shoulder chunking issue you'd have with the michelin tires. They are pretty crappy on the street though.

I am not aware of R888R sizes that would easily fit the stock GTS 19" front and 20" rear wheels.

Since the GTS has CCB, 18" are not possible, so even with 19" at all four corners, it is not obvious selecting good sizes of R888R...

[MRakete]

Originally Posted by CanAutM3

I am not aware of R888R sizes that would easily fit the stock GTS 19" front and 20" rear wheels.

Since the GTS has CCB, 18" are not possible, so even with 19" at all four corners, it is not obvious selecting good sizes of R888R...

295/30/19 square would be my choice.

[CanAutM3]

Originally Posted by MRakete

295/30/19 square would be my choice.

Interesting proposition. Doing the tread corner diagonal calculation, the 295/30R19 R888R is pretty much the same as the rear 275/35R19 PSS that are known to fit in front. So those 295/30R19 R888R would likely fit without rubbing .

[GraveSmiles]

Originally Posted by VCP

I may take M4 GTS advice and try some re 71r with GC plates.

Mine look nearly identical to that after two track days. I have been amazed by the front end grip on the GTS on the track so it's hardly surprising to me. I'm not too stressed about it either. From my experience with PSS on my old F13 M6 the balder they were the better grip they offered at operating temperature. Having said that I am looking forward to putting some proper R rated tyres on mine. Yoko R888R, if I can get the sizes.

[VCP]

Originally Posted by GraveSmiles

Mine look nearly identical to that after two track days. I have been amazed by the front end grip on the GTS on the track so it's hardly surprising to me. I'm not too stressed about it either. From my experience with PSS on my old F13 M6 the balder they were the better grip they offered at operating temperature. Having said that I am looking forward to putting some proper R rated tyres on mine. Yoko R888R, if I can get the sizes.

Spot on

[MarksM]

Tried the Cup 2's Gone in less than a day. Changing to something else for the street.
These Hoosiers worked MUCH MUCH better. Can you say "GRIP". And I can use them again for another 2 days

295 x 19 fronts and 315 x 18 rears. (Yeah, Yeah, I know. But you might be wrong!) Minor rub fronts at 3/4 full lock

[schnell325]

Originally Posted by MarksM

Tried the Cup 2's Gone in less than a day. Changing to something else for the street.
These Hoosiers worked MUCH MUCH better. Can you say "GRIP". And I can use them again for another 2 days

295 x 19 fronts and 315 x 18 rears. (Yeah, Yeah, I know. But you might be wrong!) Minor rub fronts at 3/4 full lock

[CanAutM3]

Originally Posted by MarksM

Tried the Cup 2's Gone in less than a day. Changing to something else for the street.
These Hoosiers worked MUCH MUCH better. Can you say "GRIP". And I can use them again for another 2 days

295 x 19 fronts and 315 x 18 rears. (Yeah, Yeah, I know. But you might be wrong!) Minor rub fronts at 3/4 full lock

Interesting and very creative combo

[MRakete]

Originally Posted by MarksM

Tried the Cup 2's Gone in less than a day. Changing to something else for the street.
These Hoosiers worked MUCH MUCH better. Can you say "GRIP". And I can use them again for another 2 days

295 x 19 fronts and 315 x 18 rears. (Yeah, Yeah, I know. But you might be wrong!) Minor rub fronts at 3/4 full lock

Interesting... What wheels are you using? Why not square 19's?

[ilGalante]

Originally Posted by MarksM

Tried the Cup 2's Gone in less than a day. Changing to something else for the street.
These Hoosiers worked MUCH MUCH better. Can you say "GRIP". And I can use them again for another 2 days

295 x 19 fronts and 315 x 18 rears. (Yeah, Yeah, I know. But you might be wrong!) Minor rub fronts at 3/4 full lock

Nice setup indeed! Is that minor rub coming on the "track" height setting up front or "street" setting? 295/315 is quite the meaty combo, I like! Room for that 315mm in the rear in a 19" if one were to go 19" all the way around you think? Inquiring and indecisive minds want to know

[jml]

Originally Posted by MarksM

Tried the Cup 2's Gone in less than a day. Changing to something else for the street.
These Hoosiers worked MUCH MUCH better. Can you say "GRIP". And I can use them again for another 2 days

295 x 19 fronts and 315 x 18 rears. (Yeah, Yeah, I know. But you might be wrong!) Minor rub fronts at 3/4 full lock

Now we're talking. How are you liking it?

[MarksM]

Originally Posted by MRakete

Interesting... What wheels are you using? Why not square 19's?

My reason for the reverse stagger is the tire sizes and the rims that were available quickly. I have a set of 18" CCW wheels that I used on my M4, but they will not fit the front brakes, but work well over the rears.
The chart lists the tires avail and the Black is what I was using on my M4.
The 295/19 is what I choose for the GTS fronts along with the 315/18 rears. The (minor) rub that I talked about was at the 3 o'clock position on the rear of the front tires when the wheel was turned 3/4 full lock in the paddock.
I can not believe how fast this thing is with just the tire change and full aero (as minor as it is). Easy 5-10 mph faster than the M4 (which had camber plates and the big tires) on every corner at Buttonwillow. As I was trying to find the edges, it just kept going faster and faster through the weekend. I have not had a chance to drop the car to the track settings yet. I might pick up some front rubbing without camber plates and a better offset in front. The rears appear to have miles of room.

[johnr265]

Great data point. Keep it coming!