Performance limitations
I only ask because it's easy for me to find say, an Audi RS6 with a single turbo conversion ( bc with a hot V setup, you don't really have room for two bigger turbos ) pushing 1000hp without touching the block ( just supporting cooling mods ), but yet it seems there's difficulty with the W212's to even upgrade turbos, without such a limitatio.?
Or is it more people are adverse to it since it would involve TCU tuning and warranty concerns then come into play?
Last edited by stormhammer; Apr 3, 2018 at 12:32 AM.
I only ask because it's easy for me to find say, an Audi RS6 with a single turbo conversion ( bc with a hot V setup, you don't really have room for two bigger turbos ) pushing 1000hp without touching the block ( just supporting cooling mods ), but yet it seems there's difficulty with the W212's to even upgrade turbos, without such a limitatio.?
Or is it more people are adverse to it since it would involve TCU tuning and warranty concerns then come into play?
Although, I have to ask - does upgrading the turbos involve dropping the engine front subframe?
Last edited by stormhammer; Apr 4, 2018 at 04:54 PM.
Although, I have to ask - does upgrading the turbos involve dropping the engine front subframe?
Ah - well, I suppose that would be a mod farther down the line. All things considered, an ECU tune + cooling and suspension would come first on my list, especially considering I tend to do more road racing, mountain runs and such. I worry that once turbos get upgraded you'd have to start worrying about upgrading the LSD to get power down, the clutches, etc.
I only ask because it's easy for me to find say, an Audi RS6 with a single turbo conversion ( bc with a hot V setup, you don't really have room for two bigger turbos ) pushing 1000hp without touching the block ( just supporting cooling mods ), but yet it seems there's difficulty with the W212's to even upgrade turbos, without such a limitatio.?
Or is it more people are adverse to it since it would involve TCU tuning and warranty concerns then come into play?

GT42R single replacing the twins on a hot V - mostly because you can't fit bigger twins in there.
I know the W212 isn't a hot V like the W213 is, but it's what made me curious.
Mostly because by this fall I'll be owning a wagon ( I had to stop myself from jumping on the dolomite in Manhattan sight unseen... well more like the missus stopped me. )
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GT42R single replacing the twins on a hot V - mostly because you can't fit bigger twins in there.
https://youtu.be/Uhd-PjwUS_I
I know the W212 isn't a hot V like the W213 is, but it's what made me curious.
Mostly because by this fall I'll be owning a wagon ( I had to stop myself from jumping on the dolomite in Manhattan sight unseen... well more like the missus stopped me. )
I think the the biggest limitation on the 212 is the TCU but renntech has a tcu flash available now I just haven’t seen anyone put it to the test with big turbos. The stock airboxes also restrict flow up top if you are running upgraded turbos I have know people who had good results with the ams air boxes.
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Any quarter mile times? I have yet to see one pass the 10.2 range besides one in Russia with no information on it. They are going to need to figure out a ZF trans upgrade at those power levels not sure if anyone has cracked the tcu on that trans yet.
I think the the biggest limitation on the 212 is the TCU but renntech has a tcu flash available now I just haven’t seen anyone put it to the test with big turbos. The stock airboxes also restrict flow up top if you are running upgraded turbos I have know people who had good results with the ams air boxes.
There's also this RS7 with an APR Stage 2
Stage 2 is an ECU tune + catless downpipes
https://www.goapr.com/products/ecu_u...si_rs6rs7.html - has the Stage II tab - Stage I ( ECU tune only ) they're hitting 10.6
There's also this RS7 with an APR Stage 2 https://www.youtube.com/watch?v=yu69ocpbgVc
Stage 2 is an ECU tune + catless downpipes
https://www.goapr.com/products/ecu_u...si_rs6rs7.html - has the Stage II tab - Stage I ( ECU tune only ) they're hitting 10.6
Yes that second RS7 is the one I was thinking of also heard that run was made with the interior stripped out. Makes you think why hasn’t anyone been able to match or beat those times in the US on an NHRA certified track after all these years the RS7 has been out. I also have a hard time believing the stock transmission will stay together with 1000+ torque in the long run
That being said, I wonder if we'll ever see more AMG's at the strip as they become more affordable.
There are a few M157 63’s running 10.1 to 10.0 in the Middle East and one in Russia just hard to verify since nobody has matched those times in the US on NHRA verified tracks. PP Performance in Dubai had a rwd M157 cls63 go 10.1@139 and an awd cls63 go 10.05@140 mph on the same day it’s on PPPerformance instagram.
I am sure the TCU can be tuned to run more aggressively man... I'm very soon (hopefully) going to send my TCU to a guy in Germany to re-program mine to run the 3.06 ring & pinion from an SL. If there are people out there that can do that, I'm sure that torque limits can be raised
this is of course conjecture, I suppose...It's a shame that only you guys in the USA for the 4WD E63 cars. The torque of them and crappy weather in the UK would drive me insane as a RWD car (my M156 E63 frustrates me for 8 out of 12 months a year here - it was the same with my E55 too)
I am sure the TCU can be tuned to run more aggressively man... I'm very soon (hopefully) going to send my TCU to a guy in Germany to re-program mine to run the 3.06 ring & pinion from an SL. If there are people out there that can do that, I'm sure that torque limits can be raised
this is of course conjecture, I suppose...It's a shame that only you guys in the USA for the 4WD E63 cars. The torque of them and crappy weather in the UK would drive me insane as a RWD car (my M156 E63 frustrates me for 8 out of 12 months a year here - it was the same with my E55 too)

I posted in another thread I had renntech flash my GLS63 TCU with new software with reduced torque limiters it’s a night and day difference much better. I believe GAD is also flashing tcu’s in Germany, PP-P performance claims to also do it Dubai and a Russian company K8 Strasse also claims to flash the tcu. So the tcu has been cracked with multiple companies flashing you should be good to go with your contact. Good luck with the conversion would love to hear the results once your done. Are you doing the 3.06 upgrade on an m156 e63? Boosted?
Last edited by Ezec63; Apr 8, 2018 at 10:39 PM.

I posted in another thread I had renntech flash my GLS63 TCU with new software with reduced torque limiters it’s a night and day difference much better. I believe GAD is also flashing tcu’s in Germany, PP-P performance claims to also do it Dubai and a Russian company K8 Strasse also claims to flash the tcu. So the tcu has been cracked with multiple companies flashing you should be good to go with your contact. Good luck with the conversion would love to hear the results once your done. Are you doing the 3.06 upgrade on an m156 e63? Boosted?
But yeah, top end gearing is for the brave...I think only a handful of times I've redlined 5th. Once in France (and never again) I was close to redlining 6th (holy wow my car really struggled to move once it engaged 6th at 160) but at 175 my Revozport front lip got pulled off by the downforce/installation and i was instantly over a thousand pounds out of pockey and lipless 
I wonder what exactly was done on your GLS to make it feel so much better down low. This torque limiter thing....does it enable a higher stall off the line, or is it that it allows more torque from the flywheel to pass through the transmission? I've never understood how it can do that...I mean...what does it do with the surplus power then?

Regarding gear ratio, yeah I don't know why manufacturers make cars more powerful, then cap off the wheel power so much with gearing them down (ok, probably for drivability to the masses), but there you go. I've spoken to a guy in Switzerland with the 3.06 gear gear mod and he claims that in his wagon with stock M156, he can gap an M157 S model on a rolling race.....sounds like it must be quite a significant improvement because I know for a fact that the M156 in W212 form is only a mid 12 second car. Yeah mine is an M156 with 500 to the rear wheels (it's a been a long struggle to get there though). I raced an F10 M5 on Friday night and managed to run level from 50-115 and then 30-95. He said he had an ecu flash. It seemed faster than stock, but it also doesn't sound believable either. Right after those races a CLS63 came out of nowhere (M157) and we both pulled on that one, so maybe the M5 was tuned afterall...who knows...
Damn....yes that's a bit odd. A W204 is doing 9's with around 800....
But yeah, top end gearing is for the brave...I think only a handful of times I've redlined 5th. Once in France (and never again) I was close to redlining 6th (holy wow my car really struggled to move once it engaged 6th at 160) but at 175 my Revozport front lip got pulled off by the downforce/installation and i was instantly over a thousand pounds out of pockey and lipless 
I wonder what exactly was done on your GLS to make it feel so much better down low. This torque limiter thing....does it enable a higher stall off the line, or is it that it allows more torque from the flywheel to pass through the transmission? I've never understood how it can do that...I mean...what does it do with the surplus power then?

Regarding gear ratio, yeah I don't know why manufacturers make cars more powerful, then cap off the wheel power so much with gearing them down (ok, probably for drivability to the masses), but there you go. I've spoken to a guy in Switzerland with the 3.06 gear gear mod and he claims that in his wagon with stock M156, he can gap an M157 S model on a rolling race.....sounds like it must be quite a significant improvement because I know for a fact that the M156 in W212 form is only a mid 12 second car. Yeah mine is an M156 with 500 to the rear wheels (it's a been a long struggle to get there though). I raced an F10 M5 on Friday night and managed to run level from 50-115 and then 30-95. He said he had an ecu flash. It seemed faster than stock, but it also doesn't sound believable either. Right after those races a CLS63 came out of nowhere (M157) and we both pulled on that one, so maybe the M5 was tuned afterall...who knows...
Damn....yes that's a bit odd. A W204 is doing 9's with around 800....
To tell you the truth I am not sure what was changed exactly to help my GLS63 as the information seems to be kept close to the chest by the companies that are doing these upgrades. All I know is that it launches MUCH harder and pins you back in the first 2 gears where before it always felt neutered and artificially limited.
I’m not sure how these torque limiters in the tcu work would need someone with more knowledge to chime in. I agree it doesn’t make sense that the extra torque is just magically reduced and not less pass through the transmission. I always imagined the TCU communicated with the ECU and told it to not let more than a certain amount of torque/load come through and then the ecu would handle the torque reduction by pulling timing/boost but I could be totally wrong.
Thats interesting have you done any calculations on the amount of torque multiplication increase you will receive by upgrading to the 3.06 rear end? Seems like a good upgrade for extra acceleration and the top end won’t suffer since these cars are still geared fairly tall with the 7 speed.
Last edited by Ezec63; Apr 9, 2018 at 10:19 PM.
But yeah, top end gearing is for the brave...I think only a handful of times I've redlined 5th. Once in France (and never again) I was close to redlining 6th (holy wow my car really struggled to move once it engaged 6th at 160) but at 175 my Revozport front lip got pulled off by the downforce/installation and i was instantly over a thousand pounds out of pockey and lipless 
I wonder what exactly was done on your GLS to make it feel so much better down low. This torque limiter thing....does it enable a higher stall off the line, or is it that it allows more torque from the flywheel to pass through the transmission? I've never understood how it can do that...I mean...what does it do with the surplus power then?

Regarding gear ratio, yeah I don't know why manufacturers make cars more powerful, then cap off the wheel power so much with gearing them down (ok, probably for drivability to the masses), but there you go. I've spoken to a guy in Switzerland with the 3.06 gear gear mod and he claims that in his wagon with stock M156, he can gap an M157 S model on a rolling race.....sounds like it must be quite a significant improvement because I know for a fact that the M156 in W212 form is only a mid 12 second car. Yeah mine is an M156 with 500 to the rear wheels (it's a been a long struggle to get there though). I raced an F10 M5 on Friday night and managed to run level from 50-115 and then 30-95. He said he had an ecu flash. It seemed faster than stock, but it also doesn't sound believable either. Right after those races a CLS63 came out of nowhere (M157) and we both pulled on that one, so maybe the M5 was tuned afterall...who knows...
Damn....yes that's a bit odd. A W204 is doing 9's with around 800....
My C is a 2012 coupe with the MCT I went back and checked videos and it looks like it shifts into 5th around 125mph and then shifts out around 175mph I was a little off on estimates. This is all according to the digital speed read out in dash which could be a little off and delayed but still a 50mph split seems excessive for 5th gear I’m sure they did it for fuel economy reasons to keep the Rpms low during cruising. Just wish it was a shorter gear to help torque multiplication at those high speeds when fighting against aerodynamics. Also the m156 makes power all the way to redline hitting peak power around 6K rpm and holding it all the way to redline. I believe the 4th to 5th shift drops the car back to 5100rpm would be nice to have it shorter and drop above 5500rpm to be closer to peak HP
To tell you the truth I am not sure what was changed exactly to help my GLS63 as the information seems to be kept close to the chest by the companies that are doing these upgrades. All I know is that it launches MUCH harder and pins you back in the first 2 gears where before it always felt neutered and artificially limited.
I’m not sure how these torque limiters in the tcu work would need someone with more knowledge to chime in. I agree it doesn’t make sense that the extra torque is just magically reduced and not less pass through the transmission. I always imagined the TCU communicated with the ECU and told it to not let more than a certain amount of torque/load come through and then the ecu would handle the torque reduction by pulling timing/boost but I could be totally wrong.
Thats interesting have you done any calculations on the amount of torque multiplication increase you will receive by upgrading to the 3.06 rear end? Seems like a good upgrade for extra acceleration and the top end won’t suffer since these cars are still geared fairly tall with the 7 speed.
its amazing thag finally the TCU on these m157s are able to be tuned.
So so renntech has a TCU flash that really makes a real difference?
also, running this TCU flash with 750-800wtq which tunes produce on m157s, would the transmission be reliable to handle that in the long run with less torque limits on the TCU flash?
its amazing thag finally the TCU on these m157s are able to be tuned.
So so renntech has a TCU flash that really makes a real difference?
also, running this TCU flash with 750-800wtq which tunes produce on m157s, would the transmission be reliable to handle that in the long run with less torque limits on the TCU flash?
its amazing thag finally the TCU on these m157s are able to be tuned.
So so renntech has a TCU flash that really makes a real difference?
also, running this TCU flash with 750-800wtq which tunes produce on m157s, would the transmission be reliable to handle that in the long run with less torque limits on the TCU flash?
renntech said they have been testing this upgrade for about 2 years. I doubt they completely removed all torque limiters but rather just loosened them up while still keeping reliability renntechs reputation is no joke they have been around forever for a reason. Around town driveability and comfort hasn’t changed after I did the tcu flash.

Yes does hold peak power well though. Even up to 7800 it holds onto power well. here's my dyno - i want to re-dyno again soon though as i'm positive that my latest VVT changes up top will have flattened peak power above 6500rpm even more than here:
I don't understand how they work fully either tbh though. From what I have seen, they stop the engine itself from making the power/torque by pulling timing....if the engine is capable of xxx horsepower, i have no idea how that power then doesn't get translated to the tarmac.
i dunno...no idea. The CLS would have been RWD (UK/Euro spec)....I don't remember seeing red calipers...but it was late and i was exited and being silly, so it all happened so quickly
I tell you what though - shifting at my new 'racing-only' shift point means that i don't land at 5000rpm and in the lower part of the powerband, so it's pretty much ~500rw all the way after first gear.

Yes does hold peak power well though. Even up to 7800 it holds onto power well. here's my dyno - i want to re-dyno again soon though as i'm positive that my latest VVT changes up top will have flattened peak power above 6500rpm even more than here:
I think the question everyone wants to know is....is this by brake boosting off the line, or if you simply stomp on the pedal after about 1 foot of rollout...?
Torque limiters are the work of Satan. I had a 'mare trying to get around them when tuning my M156.
I don't understand how they work fully either tbh though. From what I have seen, they stop the engine itself from making the power/torque by pulling timing....if the engine is capable of xxx horsepower, i have no idea how that power then doesn't get translated to the tarmac.
I think it was something like 3%....but I could be confusing this with my wish to gear-down my M5....too many numbers floating in my head these days. If my car can do the 60-100 spring in ~3.5 seconds after the gear change and lighter wheels, i'll be very happy indeed..
That M5 was most definitely rolling. The first pull which caught me off-guard scared me. I'm not sure how I then managed to hang on with the two actual proper runs....maybe his car heatsoaked a little....?
i dunno...no idea. The CLS would have been RWD (UK/Euro spec)....I don't remember seeing red calipers...but it was late and i was exited and being silly, so it all happened so quickly
I tell you what though - shifting at my new 'racing-only' shift point means that i don't land at 5000rpm and in the lower part of the powerband, so it's pretty much ~500rw all the way after first gear.As for where all the power goes, I think whats happening is that the car in the higher gears is unleashing its power without any of it being held back. So in the lower gears the TCU cuts its power down, but if you start from second or 3rd gear roll, the TCU doesnt hold anything back so the power is there at full potential.
I noticed that for example, M157 that trap 126-127MPH in the quarter mile can still hang from a roll start with other cars that trap around 129-132mph. So from a stop it must be limiting more power but correct me if im wrong here.

I'll speak with my guy in Germany if he's able to do anything with my car regarding torque limiters....if he can do mine, i'll make him famous (and rich)








