Mr. Happy

I removed my ECU last week to send it to Kleemann in Colorado Springs but because of the wild fires, I did not send it and put in back in my car. Surprisingly, the throttle has become much more responsive and the torque feels quite improved, even at low speed since I reconnected it. My wheels are now spinning when I take off from a stop if I'm not careful, something that has never happened unintentionally so far. The car has only 5000km and the tires are still like new. I'm assuming that this change in behavior is because the ECU has reset in the process, which improved responsiveness. But what a difference. I was thinking that the esp had a malfunction at first although everything looks like normal on the dashboard. Can the ECU reset make such a difference? Or is there anything wrong with my traction control?

Vic55

The AMG's have adaptive trannys which mimmick your driving behavior. I think I read somewhere that it records over 40 different responses from initial reset. So the first run will be the most responsive but if you granny your car over a period of driving or are limited in your ability to really unleash the car then the tranny will adapt accordingly.

On older AMG's you can do the ECU reset from in your car but it doesnt work on our models so what you did is the only way. I liken the ecu reset to something close to a sprint booster. The throttle response time is reduced and thus creates the appearance of more power. Its almost like taking the full throttle position and moving much closer. So when you normally would press your throttle and go rather quickly you are now going very quickly and of course all your TQ is coming in faster. But you didnt gain any power.

hyperion667

this seems appealing to me...
does this part simply come out/off?
and goes back in?
seems like a good idea....
and makes sense about the adaptive transmission....pretty cool

otakki

I hate that adaptive tranny thing!

So I guess now the only way to reset the ecu is to remove it for a while and then put it back in. That doesn't sound too difficult.

So how long was the ecu out of your car?--I assume it would be long enough for the capacitor to run out. I wonder if anyone knows how to remove the ecu from the M156 engine.

Vic55

Good luck with the M156 W212.... its on the inside passenger wheel well and you need to take the wheel off.

But there is on the fly tuning now that you can plug into your ODBII and do the reset that way.

Mr. Happy

Thanks for the info Vic. I was told once that you could also reset the ECU by disconnecting the negative battery cable for 5-10 minutes (be sure the key isn't in the ignition when you do so), then reconnect. I never tried.

Hyperion, if you want to remove your ecu, watch this video provided by Mainly in a previous post.

http://www.youtube.com/watch?feature...&v=KaM86MfhBmI

He warned that the two clips in the back may be harder to free than it looks on the video. You need to pull straight up for those 2 to disengage. Although I didn't try it as I said, removing a battery cable might be simpler.

Vic55

yes battery discon will do it too....

Mr. Happy

A full day but maybe 10 minutes should be sufficient

otakki

Thanks to everyone for the info. It looks like battery disconnect will be the simplest. Can't wait to try it...

AmmarYasirA

+1

otakki

Finally got to disconnect the negative terminal this weekend for approximately 6 hours or so. Not sure if it makes a difference but I opened a door and then closed it to make sure the alarm stays off before I disconnect the negative terminal.

So I got to drive it this morning, and I think it works! The car seems more responsive. But I will have to see how it's like this weekend. Overall, MB should just disable adaptive tranny on AMG cars, or at least have an option to disable it. Maybe I should just put in a switch that I can flip daily to disconnect the negative terminal overnight.

Mr. Happy

The throttle response is earlier on the gas pedal. I see MB's point on the adaptive ecu and tranny but I totally agree with you that it should be disabled on an amg.

mainly

i tried it. removed the ecu for about 10 minutes. noticed no percievable difference/improvement whatsoever.

otakki

Did you disconnect both batteries? If I remember correctly, I believe the 5.5TT has two batteries (with the second battery possibly in the trunk) due to the eco mode's repeated starting. My car has the M156 (6.2) with only one battery for me to disconnect.

Hopefully it's not placebo effect for me.

mainly

batteries?

no, i just discnnected the ECU for about 10 minutes, then plugged it back in.

otakki

Maybe try leaving the ECU out a little longer (ie 24 hours) and check the result. It's nice the 5.5TT's ecu is so easily removed.