"Post-Graduate" Education for your 722.6X Transmission
Greets. Thanx to "Nugent", an attachment he included had some wonderful info on "advanced" re-programming of the ECU, rather than the "Default" re-program.
On the W463, and the W140, the "Standard" re-programming worked fine, but on the W210, I have never been happy with the shift quality going from 1st into 2nd. Following this tutorial, you can "Customize" each gear shift to your liking. I'm not sure how applicable this is for the W463, but it's the same tranny, so if someone wants a different feel, then give it a go!
1- With and already "warmed-up" vehicle (ie. tranny fluid 80C), find a quiet strech of road and "Reset" the ECU by closing doors, turn key to position "2", hold the accelerator all the way to the floor and HOLD for AT LEAST 5 seconds. Turn key OFF, but DON'T take it out of the ignition. Also DON'T open doors. Wait AT LEAST 2 Minutes
2- Start the vehicle, and place gear selector in "1". While GENTLY accelerating, you move the selector to "2" when you feel the shift point is to your liking (gentle, or a little more "racy"), but it looks like for the 112, and 113 engines, keep it UNDER 2,400 RPM.
3- After 2nd gear engages, slow down, and put back into "1", and repeat the whole process all over again AT LEAST 10 TIMES!
4- Then, move selector to "2", and manually upshift to "3" when it suits your taste. Slow down, downshift to "2", and repeat times 10
Well you get the idea. Continue the whole process, all the way up to 4th to 5th jump, but from 3 to 5, you ONLY have to repeat 4-5 TIMES, each.
After the "Up shift" portion, practice the "Down Shift" portion with:
1- 5th to 4th downshifts, 4 or 5 TIMES, 4th to 3rd, 3 to 2, and 2nd to 1st also 4 or 5 TIMES.
Sorry folks, but I left out one IMPORTANT step:
When you are done re-programming, YOU HAVE TO KEEP THE ENGINE RUNNING FOR AT LEAST 10 MINUTES, otherwise, the programming will not be memorized.
The whole process yields a MUCH more "Custom Tailored" shifting scheme. Apparently, this is because each shift module has SEPARATE training logic.
Hope this helps someone else.
Last edited by G-AMG : 07-15-2008 at 05:17 AM.
Reason: Forgot one "important" STEP
SO let me get this straight...
with a M119. I can not exceed 1800 r.p.m.s to establish my
shift points?
That seems lower than I would like them to be.
Kevin
SO let me get this straight...
with a M119. I can not exceed 1800 r.p.m.s to establish my
shift points?
That seems lower than I would like them to be.
Kevin
Kevin,
The reason for this more "extended" method of re-programming is for a more "custom tailored" feel to your shifting.
What I would do first, is just the "simple" reset, and see how you like it. The "simple" method is after the 2 minute wait, start the car, and drive to YOUR style, and after the first 10 or so (my estimate) complete up and down shifts, the car will be trained to YOUR style.
Let me know how the "simple" method works for you!
I think there is a confusion between two different adaptations. 722.6 transmission is driver adaptive and would change shift points depending on the driving style.
The adaptations described in G-AMG post and Snap-On manual are for shift quality and timing and not for "driver adaptations". It adapts transmission for clutch plates manufacturing tolerances and subsequent wear.
I'm not familiar with reset procedure using accelerator pedal and don't know what adaptation is reset. The Snap-On scanner has ability to read and reset adaptation as described in the manual.
So the RPMs and torques shown in the procedure have nothing to do with shift points in normal driving. These are just conditions to get valid adaptation.
And there is no need to reset driver's adaptation. Just drive the car differently and transmission would re-adapt.
Also there is no need to reset shift adaptations unless transmission was rebuilt. If these adaptations are at the limit shift quality will degrade, but reset would not help.
1- With and already "warmed-up" vehicle (ie. tranny fluid 80C), find a quiet strech of road and "Reset" the ECU by closing doors, turn key to position "2", hold the accelerator all the way to the floor and HOLD for AT LEAST 5 seconds. Turn key OFF, but DON'T take it out of the ignition. Also DON'T open doors. Wait AT LEAST 2 Minutes
This is the exact same procedure I used to reset the driver-specific adaptations on my R170-based Crossfire. It made a quite difference on that car. I did it once every week or two. I'm going to have to do it on my S420 now too.
We also had a little doo-dad called a "sprint booster" that plugged in between the throttle pot and the car's wiring harness. This thing modified the signal coming from the accelerator and made the car's computer open the ETAs a bit more agressively. It made the Crossfire a lot more fun to drive! BTW it works on the SLK320 and SLK32 as well.
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"It's not about how fast you can go, but how well you can go fast."
Bob in Richmond
'97 S320 (LWB), Ruby Red Metallic, 46k miles
'97 S420V, Smoke Silver Metallic, 98k miles
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