MCT overhearing transmission - fix?
07-09-2018, 06:46 PM
#1
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Thread Starter
MCT overheating transmission - fix?
I’ve read a number of posts over the years about these cars overheating their transmissions when on track.
I’ve seen the dealer fix (to raise the threshold for limp mode) and also the much more expensive 440 package.
Is there an aftermarket tuner solution that has solved this in a way that is hardware (not a revised limp
mode threshold) and affordable?
I’ve seen the dealer fix (to raise the threshold for limp mode) and also the much more expensive 440 package.
Is there an aftermarket tuner solution that has solved this in a way that is hardware (not a revised limp
mode threshold) and affordable?
Last edited by breeze247; 04-30-2019 at 01:21 AM. Reason: Typo in title
07-09-2018, 07:24 PM
#2
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The weistec pan is higher capacity with fins and has fittings you can add an aftermarket cooler to.
07-10-2018, 02:35 AM
#3
Senior Member
Thread Starter
Thanks for that, does it actually solve the problem ether with or without an additional oil cooler?
07-10-2018, 10:14 AM
#4
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2012 P31 C63 Coupe Trackrat, 2019 GLE63S Coupe Beast
The only way to fix the OIL overheating problem is via the 44O kit. The MCT exacerbates the heat issues and infects the whole system. The MCT itself doesn't really overheat. Although the Weistec trans pan helps with trans temps due solely to the higher capacity of fluid and cooling fins (even better with a plumbed in auxiliary cooler/pump/etc), it doesn't do anything at all about the limp mode issue. I have it, made no difference.
Fixes:
44O Kit
Phenolic intake gaskets
180deg Thermostat
Radiator blockoff plate and bumper cooling duct mods
Redline Waterwetter
Fixes:
44O Kit
Phenolic intake gaskets
180deg Thermostat
Radiator blockoff plate and bumper cooling duct mods
Redline Waterwetter
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07-10-2018, 11:23 AM
#5
Super Member
The only way to fix the OIL overheating problem is via the 44O kit. The MCT exacerbates the heat issues and infects the whole system. The MCT itself doesn't really overheat. Although the Weistec trans pan helps with trans temps due solely to the higher capacity of fluid and cooling fins (even better with a plumbed in auxiliary cooler/pump/etc), it doesn't do anything at all about the limp mode issue. I have it, made no difference.
Fixes:
44O Kit
Phenolic intake gaskets
180deg Thermostat
Radiator blockoff plate and bumper cooling duct mods
Redline Waterwetter
Fixes:
44O Kit
Phenolic intake gaskets
180deg Thermostat
Radiator blockoff plate and bumper cooling duct mods
Redline Waterwetter
07-10-2018, 11:59 AM
#6
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2012 P31 C63 Coupe Trackrat, 2019 GLE63S Coupe Beast
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07-10-2018, 01:46 PM
#7
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Thread Starter
Hmm. Must say that it is a shame that the costs for getting these cars track ready is so high. We are talking ~$5,000? That is a lot.
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07-10-2018, 01:55 PM
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2010 C300 4MATIC........ 2011 C63 AMG.............. 2015 CLS400 4MATIC.....
If 180 deg thermostat gives a solution then that is a pretty cheap fix (at least from other cars, idk about c63).
07-10-2018, 02:07 PM
#9
07-10-2018, 02:37 PM
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2012 P31 C63 Coupe Trackrat, 2019 GLE63S Coupe Beast
It doesn’t hurt. Any temp you can lower helps. High water temp contributes to the problem.
But what do I know. My car doesn’t even come close to suffering from limp mode even when driving the **** out of it on track. I must be doing it all wrong.
But what do I know. My car doesn’t even come close to suffering from limp mode even when driving the **** out of it on track. I must be doing it all wrong.
07-10-2018, 03:06 PM
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2012 P31 C63 Coupe Trackrat, 2019 GLE63S Coupe Beast
Well comeon. It’s common sense that all the temps contribute to each other. Just look at the radiator block off plate. That reduces air intake temp by blocking hot radiator air from being ingested, and forces more air into the coolant radiator, which in turn lowers oil temps and delays the onset of limp mode. Anything you can do to lower any temps - air, water, oil, trans - helps tremendously. It’s irritating when people who don’t know anything say that something doesn’t work if they haven’t tried it. Because it does.
07-10-2018, 03:20 PM
#13
Member
Doesn't OP just want the fix the mct overheating problem? Unless I am mistaken, the 44o doesn't touch anything with the transmission cooler? It only adds an additional oil cooler and replaces the bottom one with a larger one. Just get the larger weistec trans pan, it definitely helps since you get more fluid which in turn will take longer to heat up.
07-10-2018, 03:28 PM
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2012 P31 C63 Coupe Trackrat, 2019 GLE63S Coupe Beast
There is no MCT overheating problem. Again, the MCT operation itself heats the entire system. The motor oil is what needs to be cooled. The Weistec trans pan, while good insurance, does absolutely nothing to delay the onset of limp mode, which is motor oil temp related. Not trans temp.
When the trans gets hot, it starts shifting funky but never triggers a limp mode. When the trans locks out Manual and puts you in Comfort, again, that is limp mode which is motor oil related. The OP is talking about limp mode.
When the trans gets hot, it starts shifting funky but never triggers a limp mode. When the trans locks out Manual and puts you in Comfort, again, that is limp mode which is motor oil related. The OP is talking about limp mode.
Last edited by BLKROKT; 07-10-2018 at 03:36 PM.
07-10-2018, 03:53 PM
#15
Senior Member
Doesn't OP just want the fix the mct overheating problem? Unless I am mistaken, the 44o doesn't touch anything with the transmission cooler? It only adds an additional oil cooler and replaces the bottom one with a larger one. Just get the larger weistec trans pan, it definitely helps since you get more fluid which in turn will take longer to heat up.
- The main lower central engine oil cooler it replaces and changes the postion to lying flat
- The secondary engine oil cooler in the side lower grill it replaces, removes the fan completely and gets a new air guide and wheel well trim
- Also replaces two oil lines with largers ones
So both are engine oil cooler replacements and dont touch the mct cooler.
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07-10-2018, 04:07 PM
#16
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anyone who has tracked our cars on a hot day knows this problem. 44O seems to be the best "one stop" fix, but good luck getting your hands on one these days (actually no, wish ME luck please). it's that time of year again in the northern hemisphere so its not surprising to see another round of people on here looking for solutions, i know thats the only reason i'm back on here. mostly all i have learned is i should have tracked the car before they stopped producing the kit!
until i somehow get my hands on a kit, the best solution i have found to avoid losing throttle on track is just to watch temps, throw trans back in comfortmode when you're reaching ~280°F oil and hold back a bit. as long as you've got air flowing the temps should start to drop pretty quickly. depending on how hard you drive that will give you at least a couple hard laps. i can see why some think its specifically a trans cooling problem for that reason. anyone who reads blkrokt's thread will see that you can give this car the endurance to last full sessions on track, its just a matter of dedication. some will say get another car, but i've learned theres nothing like absolutely thrashing an m156 on the track
better late than never
until i somehow get my hands on a kit, the best solution i have found to avoid losing throttle on track is just to watch temps, throw trans back in comfortmode when you're reaching ~280°F oil and hold back a bit. as long as you've got air flowing the temps should start to drop pretty quickly. depending on how hard you drive that will give you at least a couple hard laps. i can see why some think its specifically a trans cooling problem for that reason. anyone who reads blkrokt's thread will see that you can give this car the endurance to last full sessions on track, its just a matter of dedication. some will say get another car, but i've learned theres nothing like absolutely thrashing an m156 on the track
better late than never
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02-06-2019, 01:41 PM
#18
Super Member
Just bumping this thread to let you guys know I've decided to take the plunge on the BPE oil cooler. I'm having it installed by brentuning along with a new tune. I have a track day scheduled in May and will definitely report back with results.
02-06-2019, 03:09 PM
#19
Senior Member
Thread Starter
Great, please do keep us up to date.
02-09-2019, 10:48 AM
#20
Well comeon. It’s common sense that all the temps contribute to each other. Just look at the radiator block off plate. That reduces air intake temp by blocking hot radiator air from being ingested, and forces more air into the coolant radiator, which in turn lowers oil temps and delays the onset of limp mode. Anything you can do to lower any temps - air, water, oil, trans - helps tremendously. It’s irritating when people who don’t know anything say that something doesn’t work if they haven’t tried it. Because it does.
i think if we can create more air flow into the engine, should help decrease engine temperature.
Last edited by Rick X Joaquim; 02-09-2019 at 12:17 PM.
02-10-2019, 02:29 PM
#21
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Looking forward to your feedback after your first track day.
02-12-2019, 10:01 PM
#22
MBWorld Fanatic!
Where are they based?
03-13-2019, 01:33 PM
#23
Super Member
Sorry guys, I guess I jumped the gun a little on that post. Left the deposit for the cooler but the shop got back to me and said the company is difficult to deal with. It sounds like they had the same experience I did when i contacted them directly, they will only take payment by direct transfer to their hong kong bank account. I'll reserve judgment but not something I'm ready to get involved with for now. At least some good news is my car put down really good power on the dyno, for now I'll have to work on a block-off plate until another cooling solution becomes available.
03-13-2019, 06:18 PM
#24
Senior Member
Sorry guys, I guess I jumped the gun a little on that post. Left the deposit for the cooler but the shop got back to me and said the company is difficult to deal with. It sounds like they had the same experience I did when i contacted them directly, they will only take payment by direct transfer to their hong kong bank account. I'll reserve judgment but not something I'm ready to get involved with for now. At least some good news is my car put down really good power on the dyno, for now I'll have to work on a block-off plate until another cooling solution becomes available.
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03-13-2019, 06:19 PM
#25
Super Member
Wow that is really good to hear, I will have to reach out ASAP.
Last edited by Arjy; 03-14-2019 at 05:29 PM.
