2020 C63S coupe comes with PS Cup 2's - Page 2

Jul 29, 2020 | 04:28 PM

#26

superswiss

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From: San Francisco Bay Area

2019 C63CS

Quote:

Originally Posted by AMG RB

That pretty much changes my decision to order those tires for a build, even though it's one of the only options that's such a value seeing as one Sport Cup 2 is at least $600.

You have to be serious about getting Cup 2 tires and plan to mostly drive in the dry and actually go to the track. What many also might not realize, the Cup 2 starts at 7.2/32" tread depth, which is another factor that gives it the additional performance right off the bat. The PS4S and most other tires start at 10/32". This additional tread depth makes it more viable in wet weather for longer, but it does hinder dry performance until you wear it down a bit. Most street performance tires don't start to feel right until you have worn them down to about 6-7/32". The more worn a performance tire is, the better the dry grip becomes because there is less flex from the tread and you get ever closer to a slick state, but consequently the worse its wet grip gets. This is also where the manufacturer designation on the tires becomes important. For example the K1 Ferrari spec of the PS4S also starts at 7/32" tread depth. So if you want the PS4S to have better dry grip out of the box, you can always get the Ferrari spec if you can find them in the right sizes, but again it won't be as good in the wet over its lifetime.

EDIT: Another option is having them shaved down before installation. Tirerack and other places offer tire shaving for example, which a lot of track junkies take advantage of to get better dry performance on the track w/o having to wear down the tires themselves first.

Last edited by superswiss; Jul 29, 2020 at 05:20 PM.

Jul 30, 2020 | 10:32 AM

#27

AMG RB

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From: Fla

The horses are now in the barn, 2019 E63s

Great info, thanks........but shaving the thread takes all the fun out of doing it yourself. Looks like the best plan is two sets of wheels and tires, an impact wrench and a lift.

Jul 31, 2020 | 06:26 AM

#28

ShaneN.

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Joined: May 2011

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From: Vancouver

2018 e63s edition 1

I genuinely respect your casual attitude on finding out that the night package was left out of your order. I'd be pissed. Although black wrap won't show water spots nearly as bad as night package trim does. 🤔😂

Jul 31, 2020 | 04:55 PM

#29

elitex

Senior Member

Joined: Jan 2016

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From: ATL

2020 C63S Coupe, 2021 Bmw X5M Competition

I had Pirelli P zero Corsas on my Giulia QV and wow, that car had no grip until you put some heat in those tires. During cold wet days, front tires would skip on lock to to pick turns (Ackerman). I changed them to PS4S and they literally felt like they had more grip in almost every scenario on street.

One big negative was that the preciseness of the car was numbed down a bit and the car felt a bit softer.

I am seriously considering Cup 2’s but not sure just yet, I wouldn’t mind a more aggressive setup on this car.

Jul 31, 2020 | 10:58 PM

#30

///Bruce

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From: Pearland, Tx

2020 AMG GTC Coupe & 2018 Macan Turbo

Quote:

Originally Posted by ShaneN.

I'm gonna yell and scream at my wife and son? My hidden anger was with not only the sales lady but with Mercedes' website. Last August when we pieced this build together, there was a flaw in the 'build your own' system. It had to do with the two CF packages and I believe it was the night package(?). It might have been something else. But... if you progressed throughthe build, if you oicked the CF1 pkg and then tried to 'progressively' add the night pkg it would deny you. You had to build it 'backwards' and reverse order the 3 pieces (CF1, CF2 and night pkg). I knew it. They did not. And, when they were denied the build there at the MB dealership, they assumed it wasn't allowed.

Past tense. It's alllll gooood.

Aug 3, 2020 | 04:05 PM

#31

user33

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Quote:

Originally Posted by Jimmy_c63s

How would you recommend warming up Cup 2's for spirited street driving without "weaving" around and looking like douche? 😐

AFAIK, there's really no way to fully warm up a track tire and keep it warmed up for/during "on the street" driving. It takes significant and sustained forces to get/keep a track tire up to temp ... either cornering and/or heavy braking (well, also burn-outs, but that's very expensive and only gets the rears). If you try to run sustained 0.8G+ loads (laterally and/or longitudinally) on most public roads, you'll be a/at serious risk (and, some would say, actually _be_ a douche).
#;-))

Aug 3, 2020 | 04:21 PM

#32

user33

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Quote:

Originally Posted by AMG RB

Looks like the best plan is two sets of wheels and tires, an impact wrench and a lift.

No, get a proper torque wrench (unless you want to spend the $ for an impact wrench that has a calibrated torque capability). It's also very difficult to progressively (cross-)tighten wheel bolts using an impact wrench.

Given that Mercedes uses highly bevelled wheel holes and bolts, it's important to ensure that the wheel gets pulled into center by progressive tightening. If you slam the wheel against the hub by using an impact wrench on the first bolt, it's possbile that the wheel will not center, even with the other bolts tightened. I believe this is one of the major causes of the "oh crap, my wheel's come loose after driving a bit" issue ... i.e., because the wheel wasn't centered and wiggles loose after a short drive because the bolts were sitting "up" on the bevelled edge.

Tighten progressively using a torque wrench -- with the initial tightening round done while the tire is still "in the air" -- then drive for 10+ min. and re-check with torque wrench. Personally, I've never had a time when the "check after drive" shows anything but proper torque on all bolts, but I also never use an impact wrench.

Aug 10, 2020 | 11:10 AM

#33

Jimmy_c63s

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⏱️ 700HP Facelift converted C63 S Coupe with Drexler 3.06 plated LSD

Quote:

Originally Posted by user33

Thanks, agreed. Appreciate the tip mate.

I'm picking up my Cup 2 MO1's (AMG Extreme Performance Sport Tires) tomorrow

Does anyone here know what the treadwear rating is for the AMG Extreme Performance Sport Tires (Cup 2 MO1 aka OE Cup 2) vs the 180 treadwear rating of the standard Cup 2's?

@///Bruce would you happen to know?

Last edited by Jimmy_c63s; Aug 10, 2020 at 11:12 AM.

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Aug 10, 2020 | 04:09 PM

#34

user33

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Quote:

Originally Posted by Jimmy_c63s

Does anyone here know what the treadwear rating is for the AMG Extreme Performance Sport Tires (Cup 2 MO1 aka OE Cup 2) vs the 180 treadwear rating of the standard Cup 2's?

I'm pretty sure you'll find that the treadwear rating is the same on all Cup 2 tires (i.e., 180) and that the difference between homolgated verions is in the sidewall and/or tread pattern ... but please let us know what's listed on the tire sidewall.

Aug 10, 2020 | 04:14 PM

#35

superswiss

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From: San Francisco Bay Area

2019 C63CS

Quote:

Originally Posted by Jimmy_c63s

Thanks, agreed. Appreciate the tip mate.

I'm picking up my Cup 2 MO1's (AMG Extreme Performance Sport Tires) tomorrow

According to Tire Rack it's 180. So about half the tread life of the PS4S which has 300. Most of this is due to the initial lower tread depth of 7.2/32" of the Cup 2 vs the more typical 10/32" of the PS4S etc.

Aug 11, 2020 | 04:08 AM

#36

jerrytsao

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From: Shanghai

2017 W205 C63 S Sedan Edition 1 DME Stage 2

Quote:

Originally Posted by user33

So true, I switched to PS4S after 1.5 years of running under Cup 2, mainly due to cold tire and aquaplaning. For spiritual drive, the only downside of PS4S is the grip under heavy braking on dry condition (0.75~1G). On the street, I also find C63 S with PS4S is very easy to hit 0.75G (laterally and/or longitudinally), but difficult to past 1G unless using 100% of the brake pedal.

Last edited by jerrytsao; Aug 11, 2020 at 04:12 AM.

Aug 12, 2020 | 09:36 AM

#37

Jimmy_c63s

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⏱️ 700HP Facelift converted C63 S Coupe with Drexler 3.06 plated LSD

Quote:

Originally Posted by superswiss

Got it. Thanks a lot for posting the specs screenshot man 👍

Quote:

Originally Posted by user33

Thanks man, you are right. Got the factory Cup 2's today and the sidewall shows they are 180 treadwear on OE (MO1).
They have less stretch than the rubbish Super Sports and look a bit beefier from behind even in stock 285/255 size

Last edited by Jimmy_c63s; Aug 12, 2020 at 11:11 AM.

Aug 13, 2020 | 03:04 PM

#38

user33

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Quote:

Originally Posted by jerrytsao

... the only downside of PS4S is the grip under heavy braking on dry condition (0.75~1G). On the street, I also find C63 S with PS4S is very easy to hit 0.75G (laterally and/or longitudinally), but difficult to past 1G unless using 100% of the brake pedal.

Sounds about right. I've run PS4S on the track and can see from logged data that they're good for about 1.12 to 1.18 G lateral ... but only when warmed up.

Interestingly, doing autocross runs on a rainy day, I saw 0.9 G lateral grip on the PS4S ... beyond which resulted in 4-wheel slides. Still, pretty impressive on wet pavement.

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