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I installed an external mic on the rear license plate cover to get some exhaust notes. This was my first time running with Girodisc rotors and pads, and Ansix brake scoops. The brakes felt pretty solid and had no performance issues. I did get the car aligned at Carbahn shop before the event. The car still exhibited a lot of of understeer on the Michellin Cup2s and the front driver tire got corded on the inside at the end of the day. The rear tires have easily one more track day in them. The car certainly would benefit from wider and stickier tires up front.
I also played around with TC knob. The car does get tail happy once you get to two settings away from TC OFF. It is also pretty tricky to slide the car around as it really doesn't want to do it. I also didn't bother disabling ABA mode in the last session, and I didn't see it kick in even when passing slower cars.
I would skip the advice on the SC2 ZP's, they are getting harder to come by in the proper sizes for our cars, and I have found slightly better performance from the Michelin Pilot Sport Cup2 R "MO1" which is the harder compound, vs the "MO1A" softer compound, AMG GT Black Series tires. You can also go wider, and because they have a slightly taller sidewall, manage heat better than the tires suggested above.
285/35-19 fronts and 335/30-19 rears.
If you want even a slightly quicker tire, get the Hoosier "DOT" slicks, 295/30-19 fronts and 335/25-19 rears work on factory wheels.
Which GiroDisc compound did you go with? GP30 fronts and a GP20/25/30 rear?
I would skip the advice on the SC2 ZP's, they are getting harder to come by in the proper sizes for our cars, and I have found slightly better performance from the Michelin Pilot Sport Cup2 R "MO1" which is the harder compound, vs the "MO1A" softer compound, AMG GT Black Series tires. You can also go wider, and because they have a slightly taller sidewall, manage heat better than the tires suggested above.
285/35-19 fronts and 335/30-19 rears.
If you want even a slightly quicker tire, get the Hoosier "DOT" slicks, 295/30-19 fronts and 335/25-19 rears work on factory wheels.
Which GiroDisc compound did you go with? GP30 fronts and a GP20/25/30 rear?
Are you sure Hoosier 19 in slicks would fit on 20 in rear wheels? I'd be interested in that setup if it works. Thanks in advance!
Are you sure Hoosier 19 in slicks would fit on 20 in rear wheels? I'd be interested in that setup if it works. Thanks in advance!
Thanks for the typo catch, have had 19/19 on the mind as I am working on the ultimate 19/19 width/offset set up for those wanting to run true slicks......I'll correct that above once the "EDIT" function appears again..... before your interest gets the best of you and you give it a try.
Hoosier R7/A7
295/30-19
335/25-20
on stock wheels.......
Pilot Sport Cup2R on stock wheels
285/35ZR19
335/30ZR20
Haha, ya I figured. You're saying for our cars (GTR) there are 2 different types of Cup2Rs? M01 and MO1A? I went to tirerack and put in GTR BS and only found the M01 version. It's listed as MB spec.
Haha, ya I figured. You're saying for our cars (GTR) there are 2 different types of Cup2Rs? M01 and MO1A? I went to tirerack and put in GTR BS and only found the M01 version. It's listed as MB spec.
Correct, 2 versions. When calling TireRack, the people who answer the phone didn’t know the difference or even that they carried both.
“MO1A” is usually what you’ll find on a Black Series on the showroom floor, similar properties to Sport Cup 2 “MO” meaning that for street use it gets up to temp and grips quicker, and on track it does well but can get a bit toasty if pushed.
”MO1” is an optional tire, harder compound, takes a slight bit longer to get temp into it on street or on track, but has a more linear heat tolerance curve in my EXPERIENCE with all 3.
Also, for anyone looking to save a little over TireRack on Cup2R, Hoosier’s, or Motorsport slicks from Michelin, I have had wonderful experiences dealing with a track day tire supplier who I’m sure would be happy to pass some savings along to others. My goal with them is to get more AMG GT cars out on track!
PM me for contact info.
... but, according to what I see listed, the load rating on the Hoosiers is around 500 lb less than the spec'd rating for a GT-series car.
Doesn’t matter, still enough load rating there at just shy of 2,600 pounds front axle tires and almost 3,900 pounds rear tires axle load. All good with room to spare.
Not to de-rail the thread, one day I’ll start one about all this stuff, here’s the ideal Hoosier 19/19 set up if wanting 19’s all around so you have a true slick option as well:
295/30-19 fronts
345/30-19 rears
I wonder if it makes sense to run less camber up front since the car has a double wishbone suspension. It looks like the car likes to drag the inside of the tire during a turn and this causes premature wear on the inside. The outside and the middle of the front tires are in pretty decent shape, but the inside is done. Any recommendations on the 19 inch wheels?
https://www.tirerack.com/tires/conti...econtact-force I have run Conti ECFs on my M3 and they did pretty good. Not as sticky as an NT01 but they are pretty durable. Looks like it will work easily on 19s w/o costing a ton. It just requires a set of 19 wheels. They do have a 305/30-20 and a 345/25-20, but that is not a direct fit as the stock tire is 325/30-20.
I wonder if it makes sense to run less camber up front since the car has a double wishbone suspension. It looks like the car likes to drag the inside of the tire during a turn and this causes premature wear on the inside. The outside and the middle of the front tires are in pretty decent shape, but the inside is done. Any recommendations on the 19 inch wheels?
I have yet to see an AMG GTR be able to get enough negative camber from factory shims that it would exceed what one would want on track.
https://www.tirerack.com/tires/conti...econtact-force I have run Conti ECFs on my M3 and they did pretty good. Not as sticky as an NT01 but they are pretty durable. Looks like it will work easily on 19s w/o costing a ton. It just requires a set of 19 wheels. They do have a 305/30-20 and a 345/25-20, but that is not a direct fit as the stock tire is 325/30-20.
That tire would be good if you did 19/19 track wheels vs factory 19/20 as they have a 295/30-19 and a 345/30-19.
In the 20" rears, the 305 too narrow for a GTR, the 345 ok but you need a wider rear wheel for optimum performance.
In the 20" rears, the 305 too narrow for a GTR, the 345 ok but you need a wider rear wheel for optimum performance.
Can you clarify "a wider rear wheel"? The rear rims are 12" wide. Almost all 345 will fit well on 12". Are you suggesting wider then 12"? If yes, care to elaborate?
Thanks
Can you clarify "a wider rear wheel"? The rear rims are 12" wide. Almost all 345 will fit well on 12". Are you suggesting wider then 12"? If yes, care to elaborate?
Thanks
Tread width of that tire is 12.8", so would perform more optimally on a 12.5" wide wheel.........OPTIMALLY.
The tire can be mounted and work on 11.5" or 12" wide wheels as well.
Generally speaking, for optimal tire performance, should try to keep tread width and wheel width within a 1/2" of each other.
I have yet to see an AMG GTR be able to get enough negative camber from factory shims that it would exceed what one would want on track.
Even at 2 degrees of negative camber, I am wondering if that is adding to inner tire wear. The outside of the tires looks fine, so certainly more negative camber is not necessary. I am suspecting that with the double wishbone suspension, more than 2 degrees might not be necessary.
Even at 2 degrees of negative camber, I am wondering if that is adding to inner tire wear. The outside of the tires looks fine, so certainly more negative camber is not necessary. I am suspecting that with the double wishbone suspension, more than 2 degrees might not be necessary.
Search this forum and you'll find lots of discussion/data regarding GTR/Pro camber setups for track running and comments about street-driving inner-tire wear with high-camber setups.
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