Concerned about CS

[NYG]

Originally Posted by jmg

What are your impressions of the CUP2's as a track tire?

I preferred SS on the M4. They we're a little slower but more consistent in North East weather range and didn't fall off as fast.

Steering felt more precise with Cup 2 over NT01 but a little less grip in corners.

I'm running Cup 2s now on the R8 and they're okay-ish. If they made a set of Eagle 3Rs in my wheel size, I'd rather use those.

[bmwcscam]

Originally Posted by NYG

This. The crankhub issue is almost EXCLUSIVELY an issue with tuned cars. The rare case with an untuned car always has questions marks as to whether it was tuned prior or even the credibility of the person claiming it.

Also used to track my M4CS HAAAAARD and my engine was always reliable and ran ice cold even on the hottest days.

I never tuned it.

I ran Cup 2s, NT01s, Toyo RR, you name it.

This is the type of stuff I like to hear

[NYG]

Originally Posted by bmwcscam

This is the type of stuff I like to hear

Come to the track forum if you want some more confidence. Guys like fanatic1 jmg SYT_Shadow are still running their cars HARD on the track in CSs - no stop light roll racing.

[bsmf8x]

If you're pushing 520+ whp then worry ab crankhub. If below that, especially if stock tune, don't think about it for a second.

[TractionControlDelete]

Originally Posted by k_mann

Its my understanding that the crank hub is only an issue when going stage 2 and up. Potentially stage 1 as well. But I don't recall anyone spinning a hub on a stock motor. Save of course someone money shifting in a manual....that could potentially cause it.

Nailed it 👆

One caveat… BMW basically eliminated or atleast curbed the risk of money shifting with a reflash (around 2017) where the electronic throttle works to limit the damage from a bad shift. Ask my brother-in-law how I know the above update works as intended

And yes yes yes, before the local know-it-alls chime in, I do know that the transmission speed is separate from the electronic throttle but as stated above it assists in curbing the the damage through throttle regulation (and braking too I believe - similar to how the car slows itself when the speed during cruise control gets a bit too fast). I wouldn't recommend trying it obviously but the point being that later model 6MT cars seem even less susceptible to SCH issues if below Stage 2

[paulo_f80m3]

Seriously, do not worry about it.. This topic has been beaten to death with a stick and thrown into an incinerator. You have a 1% chance of this happening across all power levels tuned or stock. This forum and all other social media accounts for probably 5% of all s55 engines ever produced. If you wanna go ahead and blow 5-6k on getting a "fix" done on a car that's not broken then go ahead its your money but I seriously wouldn't stress about it. Go out there and enjoy your CS. It's one hell of a machine that will keep you smiling wherever you drive.

[F82///M]

My humble, maybe a bit trolling opinion is that crank hub slips more often when not using Bmw TwinPower Turbo 0w30 LL-01FE engine oil. Anything else has more lubrication and makes it slip :P

[jdhiro]

Originally Posted by NYG

I preferred SS on the M4. They we're a little slower but more consistent in North East weather range and didn't fall off as fast.

You prefer the SS over the Cup 2? The SS are "consistent" in the way that driving around on sticks of butter would be consistently bad

PS4s and Cup2s are both huge upgrades over the SS that are just highly dated at this point. I prefer the Cup2s because they have a fitment specifically for the car, and I have a daily. If I daily drove the CS though, I would likely go with PS4.

[NYG]

Originally Posted by jdhiro

You prefer the SS over the Cup 2? The SS are "consistent" in the way that driving around on sticks of butter would be consistently bad

PS4s and Cup2s are both huge upgrades over the SS that are just highly dated at this point. I prefer the Cup2s because they have a fitment specifically for the car, and I have a daily. If I daily drove the CS though, I would likely go with PS4.

jmg is one of the f8x track guys so he's more interested in track not formula roll race.

Cup 2 is faster than SS but terrible in water and heat cycle/grip falls off faster. They're both pretty trash tires compared to, for example, Eagle 3Rs.

SS has been either as fast or a few tenths faster than PS4S. PS4S have an atypical compound mix and can be really finicky with tire pressures. The PS4S is by far the better daily driving tire but if you'll track the car SS is a legendary tire for value and really solid street tire performance.

[jdhiro]

Originally Posted by NYG

jmg is one of the f8x track guys so he's more interested in track not formula roll race.

That makes sense - I haven't run any of them on the track yet, so I'm not qualified to give my input there

[jmg]

Originally Posted by NYG

jmg is one of the f8x track guys so he's more interested in track not formula roll race.

Cup 2 is faster than SS but terrible in water and heat cycle/grip falls off faster. They're both pretty trash tires compared to, for example, Eagle 3Rs.

SS has been either as fast or a few tenths faster than PS4S. PS4S have an atypical compound mix and can be really finicky with tire pressures. The PS4S is by far the better daily driving tire but if you'll track the car SS is a legendary tire for value and really solid street tire performance.

Yeah, this is why I was asking about the Cup2s. I got funny looks when I said I didn't want to run Cup2s because there are better options. This was mostly from the Porsche guys at a local autocross that swears by them... probably because they came with their P-Cars. I figure I'd ask since you have more experience then them, and you've actually used them on a road course.

[RugbyBro]

Originally Posted by jmg

Yeah, this is why I was asking about the Cup2s. I got funny looks when I said I didn't want to run Cup2s because there are better options. This was mostly from the Porsche guys at a local autocross that swears by them... probably because they came with their P-Cars. I figure I'd ask since you have more experience then them, and you've actually used them on a road course.

There are new gen cup 2s which are supposed to be much better and have higher TW (240 now) - currently have a live thread on it in the wheel/tire section

[NYG]

Originally Posted by jmg

Yeah, this is why I was asking about the Cup2s. I got funny looks when I said I didn't want to run Cup2s because there are better options. This was mostly from the Porsche guys at a local autocross that swears by them... probably because they came with their P-Cars. I figure I'd ask since you have more experience then them, and you've actually used them on a road course.

Most of the Porsche track guys I've met have been pretty sharp but you'll definitely find bad information in that group too. That's not to say Cup 2s are a bad tire - I'm currently running them on my R8 but only because I'm sticking with factory wheels and extremely limited to either PS4S (which I have a set for street so I stand by this tire being awesome as jdhiro said), Cup2s or Trofeo R. I have to look again because buying a new set of Cup2s every 3 days on a track is awful and Trofeo Rs are sick but way too expensive.

[DGNFY]

Zero concern here.