jn66

Hey fellas

What do you figure the life expectancy is on our clutches?

Any upgrades or aftermarket available?

Was thinking that perhaps it’s my clutch slipping when the power is cutting out 3/4 through a hot/hard session on track

Cheme1985

Dodson clutches

jn66

currently on the website. Thank you.

thebishman

Unless you’re seeing super hot transmission temps I’d be surprised if the transmission was hot enough to cause the clutches to start to slip. Are you noticing that the engine revs are spiking when you feel the ‘power is cutting out’?

jn66

No, not currently. It’s as if everything stalls almost. I’m on the track currently and once in 4th and once in 3rd the hp cuts out around 325-430

Just stops climbing. The constant pull I would normally have is gone.

Top speeds on the straights is drastically different. 20+ km an hour in some cases

user33

To the original question, I'd expect that race starts are hard on the clutch wear. Any data or tech info that could confirm/dispute this idea?

jn66

This is what I was thinking 30,000km of hard driving may have taken a toll on it - shouldn’t say I was thinking this. It my mechanic buddy who is here with me hypothesized it - seemed reasonable

supertanch

Have you seen high trans temp in the past when driving hard / on track? the DCT clutches are supposed to last very well, they are designed with no primary rebuild needed.

Sometimes, if there are cooling issues it could acted as cutting power, sometime it's the diff cooling. So might make sense to pressure check the cooling system.

jn66

so far no cooling issues that I can see at all - I wrapped it up early here on the 3rd day. Dropping the car off Friday or Monday at the dealership to find out what’s going on.

supertanch

Good luck and keep us posted! I think all of our heavily tracking the car will sooner or later hit some issues. I recently had my auxiliary radiator replaced (damaged by debris), and that was discovered on track - the transmission would not shift and an error pop up as check coolant.

jn66

Wow. Good you got that replaced.

I’ve replaced a turbo and the bov (which had a leak) previously.

I’ve had this car 3yrs this November but all previous cars were American. Never really sure how long these parts are supposed to last before being replaced.

supertanch

Yikes! TBH some of these parts will fail at some point if one tracks heavily. That's why all race cars have a service schedule. I've been pretty meticulous on the maintenance and hopefully that would prolong the life of esp the drivetrain parts.

MBNRG

During track sessions or otherwise, how often do you use Race Start?

Do you usually run sessions exclusively in Manual M Mode, or one of the Auto Modes?

jn66

track sessions are rolling starts. Always in race mode and I use both the auto clutch and manual -
or a combination of auto and downshifting

untamedd

im having a hard time grasping this - in 30,000 km you have had to replace your turbo and bov and now your clutch is gone?

is this how brittle these GTs are huh?

jn66

Not sure if the clutch needs to be replaced and I can’t count the amount of track days I’ve done. I think it’s held up remarkably to the abuse and would recommend this platform to anyone.

Acta_Non_Verba

Hi jn66,

In an earlier post you mentioned 30KMs, just curious, have you done a fluid change in the transaxle? It's a little early for a street driven car, but if you are tracking heavily and have not done a fluid change, I am wondering if the DCT F3 fluid in the gearbox and the Spirax in the differential aren't just exhausted of friction modifiers, and saturated with clutch wear debris.

Best,

Acta

jn66

I have my no…I will though. Thank you. Never would have occurred to me!

user33

(Not meaning to hijack the thread) I use auto with manual/paddle overrides, but find that the GTR Pro, unlike the C63 S, will not downshift until _really_ low RPM after using the temporary manual-override mode. I.E., with the C63 S in race mode and auto, I could inject a paddle down-shift in a slow corner and at the next braking zone the auto-downshifting would keep the RPMs above about 3500. With the GTR, once I do a manual/paddle-shift override, auto-downshifting won't occur until about 1500-2000 RPM, even after the temporary manual-override has timed out. I found a workaround -- hold down up-shift paddle for a couple of seconds, i.e., do manual max gear selection -- but by that point, that lap's lap-time is destroyed.

Does anyone else's work differently?

jn66

Mine is about the same. I have to be full manual shift to get it to do what I want. The hybrid I run sometimes between auto transmission and still using the paddles isn’t great - I do it when I’m tired haha