Robert AMG

iTrader: (1)

Hi, anyone success to get the throttle blip/rev match when downshifting without a tcu tune on m278 cars?

nota_amg

nope. afaik, it's not available with the TCU tune either. I've never heard of any m278 car that has rev-matching downshift capabilities...

Robert AMG

iTrader: (1)

found only this guy with the video below, he said that when he enable the M mode the throttle blip was enabled also, i did it M mode with an e550 2012 but the throttle blip didn't work.

GodsLt

I'm going to jump in here with a caveat - I have a 2014 E550 coupe (M278 engine)

My car rev matches downshift especially in the higher RPM ranges. That being said my car has an "M" mode. I'm unsure if it'll rev match in S or E as I haven't tried.

Dane500

I do not get an audible with my 13' 550 but the downshifts are smooth nonetheless. Spirited driving is spirited....with or without the sound.

nota_amg

My 2012 E550 Sedan does not have M(Manual) mode for transmission...just C and S...

Left Coast Geek

well, you go into manual mode when you use the paddle shifters, if you stop using them for long enough, it reverts to automatic.

nota_amg

No, that's not how that works. Manual mode is just that, manual shifting, and requires a "Manual Mode" function on the switch in the console. Marked C/S/M, not C/S like our cars. You may think it functions in a way that is similar to the manual mode, but it is not. It's still automatic and will upshift in its own, and downshift on its own as well. Manual mode does not do that.

TLDR: If there is not an "M" on the button, there is no manual mode.

Robert AMG

iTrader: (1)

I can help you to activate the M mode if you have xentry with vediamo software.

Amr_c63

Iv been trying to see if it can be coded in also for the longest time , I have M mode coded in already and it downshifts normally , not with a brute downshift .

mjec515

Ive also been wanting this for years now...all he says is M coding etc...

watching the video now i just realized...he doesnt even have true M mode...i got my M mode coded and the M on the cluster is red..just like on the amg's

True M mode- just gives u full control of the gears...did not give me rev match downshifts

this is the only thing left i want on my car lol...it would make it so much more fun to drive as the tranny is already such a let down on these cars

Amr_c63

So guys just an update I have the manual mode coded in on my 14 E550 and after a couple days of driving it had started rev matching the downshifts . But just so everyone knows it only really works above 3/3.5k rpm .

Robert AMG

iTrader: (1)

good update, do you have any screenshot or can you got the software number in your transmission vgs, HW/SW?
question is also for all guys who have the rev match (M278).

Amr_c63

this is my factory read out . Don’t know if it helps .

Robert AMG

iTrader: (1)

this will not help, just a simple Xentry screenshot showing hardware/software numbers like this one:

Robert AMG

iTrader: (1)

on my cls63 S and S+ are red, M is white (@ mjec515).

Amr_c63

i will hook it up and get this Info

mjec515

I did that update december 2019 i believe it was

I finnally got an online access with my xentry...

I updated about 10+ modules

I went through every module and if there was an update i did it

The trans had no update however...

It was the ECU that had an update
it said something about a possible remedy for rough shifting...i took a picture of it but its on my other phone

After updating that...my car was back to stock and the renntech hht could not be used..it wouldnt upload the tune...had to send it back in...they did something to match the update or sum...

so right off the bat after the update...the downshifts when using paddles were more synchronized with a tiny hint of a rev-match...

Before Update: downshifts were roughish...it was like a beginner trying to rev match downshift on a manual car...not quite as smooth/precise/fluid

After update: much smoother downshifts

BUT!

Its not as agressive as that e550 on that video
The update came out i believe 2019? Ill check the pictures..it said the relased date of the software on it
that brutal downshifting 550 on youtube was recorded 3 years ago...so that one does have some special sauce on it

S. Madman

I have to check mine, I have a 2012 with Renntech HHT, I think I have rev match. Let me make a video.

Robert AMG

iTrader: (1)

the rev match downshift has nothing to do with ecu, it is tcu related.

mjec515

LOL...read what u said again and again...
Smh

1. Did i ever say anything about it being tcu or ecu related
Im telling yall from what i experienced before and after the ECU update
-if u wanna get technical or if u even understand
What the update did....it increased the revs of the engine[HOW? ADDED TIMING/FUEL ETC] when downshifting to better match the tranny speed therefore resulting in a more smooth seamless downshift...

Compared to before the update
There was really no "rev" [or sudden rpm increase] when downshifting therefore it was a bit rough and wasnt a smooth transition

downshift rev matching on a manual car...when u blip the throttle too much and release the clutch it will jolt...
When not enough rpm increase is given it will not be a seamless transition also...it has to be just right...

2. i believe the ecu does have a part in it...TO REV MATCH THE ENGINE....HAS TO INCREASE THE RPM CORRECT?
WHAT CONTROLS THE ENGINE? ECU? CORRECT?
YES OF COURSE THE TCU ALSO HAS A ROLE...

3. HAVE U OR EVEN KNOW HOW TO REV MATCH DOWNSHIFT ON A MANUAL CAR?
THE ENGINE REVS HIGHER WHEN YOU TAP ON THE GAS
SHIFTING THE GEAR DOES NOT MAKE THE ENGINE REV HIGHER

SO TELL ME NOW WHAT CONTROLS THE REV-MATCHING DOWNSHIFTS

EXPLAIN
NONE OF THAT GENERIC BS

"the rev match downshift has nothing to do with ecu, it is tcu related"

Just cause it has something with tranny/shifting oh its all tcu

Lmao

ITS ONE THING TO UNDERSTAND HOW TO BOLT ON AFTERMARKET PARTS TO YOUR CAR....

ITS ANOTHER THING ENTIRELY TO UNDERSTAND HOW THEY ALL WORK TOGETHER!!!
SMFH

Robert AMG

iTrader: (1)

lot of bla bla bla, ask your tuner then get back.

Amr_c63

Once I get a chance I’m going to make a video and submit to this thread

mjec515

thats what i thought

sit ya *** down boiiiii

Amr_c63

made a short clip for the non believers