odonnks

Do any of the tunes shorten the time between the pull of the paddle shifter and the actual gear change?

The gear change is decently quick, it's the fraction of a second that it occurs after pulling the paddle is what I'd like to shorten.

Thanks !

jmueller

I'm pretty sure the only way to speed that up is with Weistech's valve body upgrade.

chrisridebike8

I don't have a FL but most people say the delay is shortened with most ECU tunes. I know on my pre-FL the delay is much less with the Eurocharged tune. Both the v4 and my current v5 are a huge improvement over the stock shift delay. I used to always bump the limiter. Now I don't. And if I flash back to stock, I still bump sometimes. It's no dual clutch box, but it makes the 7G tolerable.

Wobble64

According to Eurocharged themselves, their tune does not touch the transmission control program at all, but is limited to the ECU. The engine blips more (to match revvs or does it maybe even overdue it for drama?), but I struggle to see how an ECU tune would change shifting times.


Does anybody really know?

odonnks

My thought was that since the ECU tune is loaded via the OBD port that a TCU tune could also be loaded.

The MCT shift is nice and hard but it seems that the command to do so while in M is delayed a tad.

alexmtl

There's a lot that can be done with software to help the transmission, I wish some tuner seriously looked into it. That said I believe the lag is a mechanical issue and I don't think it can be much helped with a software update (and to me, it's not the biggest issue on the transmission). I could be wrong though.

604 C63

I know a guy who knows a guy.....

who, when he had sluggish transmission issues, ended up with a new ECU being the fix.
So there is something to that train of thought.

odonnks

The shifts are nice and firm but the delay seems electrical. I could be wrong and it may be hydralic which I'm sure is tougher to speed up.

rage2

The delay is definitely software. The FL C63 and the BS has the exact same hardware, yet the BS is faster from click of the paddle to actual shift. The new W205 C400 is as fast as my BS from paddle to shift as well, and it's not an AMG nor MCT. Pretty sure the W205 has the same old 7G-Tronic gearbox.

average joe

The TCU needs removing to "tune it" as far as i am aware.
I am planning on the Weistec valve body and TCU upgrade for my 7G box. (just a pain having to ship it to the USA from UK)

I have driven a C63 with MCT with the Weistec upgrade and it was really quick in M when changing compared to a standard MCT.

roadtalontsi

that delay will never go away, it's still an automatic transmission.

Wobble64

I keep hearing that an MCT by principle, will be slower than, for example, a dual clutch transmission. Does anybody here know why this would be the case? In other words, is a planetary gearbox with multiple clutches that stop the planetary gear cages, always slower than a traditional gearbox with switching pins? If so, why?

rage2

A lot less moving parts when executing a shift would be my guess, but the shift times itself is negligible. If we're focusing on response (time between paddle push to shift) a DCT has a huge advantage in that the next gear is pre loaded in the transmission, so all of the work is done already, and the paddle push literally just activates clutch actuation.

alexmtl

+1 DCT means Dual clutch, the software decides which gear to preload depending on the conditions, and if you do the shift the software predicted then it's done in milliseconds.
If you don't do the shift the software predicted then it takes a very similar time, if not longer, but it's quite rare.

Wobble64

Aren't all gears preloaded also in the MCT? Maybe there is more inertia in a planetary gearbox. I would have to study up some......

roadtalontsi

no, mct only has one input shaft. its in essence one clutch with multiple disks. Dual clutch has separate input shafts, with separate cluthes. One clutch is disengaged and waiting in the next gear. so all that is necessary for the shift is to disengage one clutch and engage another. Dct's are pretty much like 2 manual gear boxs put together, they also have regular gears and synchros except those parts are automated.