thebishman

I'll be the first to admit that I could well be wrong, but there is no way that MB changes anything programming wise between cars delivered with the OEM SC2s or the Sport Cup ZP tyres.

Bish

BenzGTR

They would have to, for many reasons most important being legal/safety issues as the speedometer/odometer would be way off. 1" diameter (the ZP's are 4% shorter in circumference is a LOT. Every car that leaves a factory has the proper tire height programmed.
The 4% difference in circumference on these tires would be 3mph off on the speedo at 70. And the shorter diameter car would have 4% more miles on it then the taller diameter tire. On your shorter tires, your odometer would show 104,000 miles after driving 100,000. the shorter diameter car would also show 4% better gas mileage on the dash. RPM's, shift points, top speeds in each gear etc all change. Of course Mercedes would fix all that with a couple lines of code.
On another note, I figured out a way to run the Michelin slicks and not have to run skinny tires.
When I originally did the math it was for the ZP sizes, in the SC2's I can run much more appropriate widths, gonna run these sizes:
24-65-19
29-67-19
If I get my car in time and have the break in miles done I will be hitting the track Nov 17th-18th with Nasa.

Brian Clarke

Stop over thinking it. Every single magazine article done in the US with all the amazing track times with done with the ZP tires on the car. Then they didn't give them out to the US folks even though we ordered them with it. You can however just order the TPC Spec tires for the Z07 package corvette from Tire Rack. They are the best option for our car.

BenzGTR

My post wasn't saying the ZP's arent a great option, my post was showing the differences in tire heights on a car. They are indeed the best street tire option for my car if you plan on tracking it, but by no means are the best track tire. They are the easiest way to go, but not the fastest. The fastest track tire would be Michelin S8L, then Michelin S9L, then Pirelli DH, then Hoosier A7, then R7's, but would have to run 19's all the way around for the slicks, Hoosier is now finally available in 20's for limited sizes. One benefit of the ZP's for the track besides being stickier obviously is your car will be .5" lower and theoretically accelerate quicker with a 4% steeper gear ratios.
1" rear tire height change seems to not sound like a lot to you, but for hardcore track guys the top speeds in each gear can be important, based on the track you are running.
Here are the top speeds in each gear for the standard tire and ZP's side by side
1st 46mph 44mph
2nd 72mph 69mph
3rd 96mph 93mph
4th 122mph 117mph
5th 153mph 147mph
6th 187mph 180mph

You will again think this is "overthinking" hehe, but I'm obsessed track stuff, it's a sickness

Brian Clarke

Come see me in Nov @ Summit and let's do some lead follow. The bearded GTR owner. I'll have a few cars out there for that event, crazy Subaru's.

BenzGTR

Sounds like fun, but I'm in Arizona, the farthest I've made it is COTA. I'll be there next month again for the Nasa Nationals. Make sure and post some pics after the event!!!

ML63 AMG

BenzGTR

I didn't figure it out because I figured top speed would be drag limited in 7th. If you want to get theoretical top speed in 7th use this- http://www.tremec.com/calculadora.php

janstuart

what pads would I use for street....track with the ccb on the GTS?

thebishman

EVOII_Racer

EVOII_Racer

descartesfool

That Tikt front brake cooling duct looks very good. I sent them a message asking if it also fits the AMG GT-S with iron brakes.

EVOII_Racer

invictusmaneo

Just chiming in on the tires...it may be a simple setting swap in STAR--on the W463 in the transmission configurations in star you can choose between 3 different tire sizes, to include ones that equate to roughly 33" in diameter (much larger than stock 31s) to allow for the traction control, speedo, ABS, etc. to properly compensate. I wouldn't put it past something similar being available in the settings for the GTR, though it may take some digging to find it.

Draptec

It fits all GT, GT-S, GT-C, GT-R cars with iron and ceramic brakes.


Brake duct AMG GT

austintipton

That looks awesome. If I would have known about that a year ago, I might still have my GTs.

thebishman

descartesfool

It's on their web site, 1490 euros. http://tikt.de/tuning/amg-gtr/bremsen

I have gotten a reply from Jonathan at TIKT and sent him the technical diagram of the Brembo steel rotor for the GT-S, but he never confirmed that their kit fits. Picture above shows it does. I asked him if he had any data about cooling effectiveness as well. I will ask him again.

Draptec

I can answer most of Your questions as I work in the partner company which did the development of these for Tikt... Also understand that it might be sometimes difficult to get an answer from German companies in general as it is hard for them to find employees who speak English. As for the effectiveness: It helps a lot. Measuring the temperatures of the rotors left/right with duct/stock heat shield You can clearly see the difference between the sides. They won't yet issue the exact figures in terms of percentage of improvement in comparison to the stock setup but they will with first nice weather when we put the car over the limits on the race track. We are currently working on the similar setup for the rear as well. I have seen another thread https://mbworld.org/forums/amg-gt/73...-warranty.html where guys discuss the overheating problem so there I will try to explain my opinion on key problems based on research I did with the car.

thebishman

descartesfool

It would seem like a great design improvement to have the lower section of the air inlet to be a removable and replaceable piece for the inevitable damage that would result from it striking a hard object. Once off the track, one could simply remove it for street driving and re-install it for the track, as obviously removing the entire assembly would be much too time consuming. Also the bottom piece could be made to break off without damaging the main piece should one hit an object, whether on or off the track. It would be a very costly assembly to replace if the entire piece needed changing, possibly involving long delays to get replacements.

Draptec

@thebishman Yes, I'm sure they would offer some discount, but in my experience with shipping to US, You guys would save a lot more in shipping. For example sending a box with one kit would cost around 350€ and box with 10 kits would be around 500€

@descartesfool The inlet is actually almost in level with undertray (depending on the height of suspension setup) Also it moves with the wheel. We figured out that the obstacle which would damage the duct would cause so much damage on the car that the duct would be our least concern. We will see what happens in the next month or two of exploitation on cars of our customers who have the kit. We had no problems on the street in Our testing period.

thebishman

Draptec

No, cheap injected materials are not a possibility due to the high temperatures these parts are exposed to. Actually we have to use very special resin matrix to make it possible even with cf. As I explained in the other thread, it is essential to feed the rotors with cold air and both separate the hot exhausted flow and to achieve that we had to make the duct which has very little distance from the rotor surface which would melt any thermoforming plastic... and we have some aerodynamic forces as well.