kponti

OK now that I've got your attention (since this is the only title that gets posts nowadays on here sans sales threads).

This is an observational thread.

I got the iCarsoft obd scanner for MB and it is pretty good as far as obd Scanners go especially for the price. I can reset the ecu and tcu in a sequence similar to how I did it in the past with my E55 using the DAS/STAR system. You can go into most of the individual systems (airmatic, AC, and other electronic systems) and check for codes and reset as needed.

All that and yet nothing matched the stupid ecu reset using the key and accelerator pedal. Wtf does that thing actually do?
I reset the ecu and tcu via iCarsoft just a few days ago after some work done to the car. Car felt strong again but not as strong as it did a few months ago. Minimal to no wheelspin in second gear (remember I have the 2012 RWD which will destroy everything on a roll race except maybe the CLS300).
Just on a whim, I did the pedal key dance thingy last night and Whoa! Lit up tires no matter the speed, as long as 2nd gear is engaged I wasn't moving forward fast. Car overall felt a lot stronger like it did with the downpipes back on (downpipes are off the car, but that's another story).

Very strange the the key pedal dance is more effective hands down than reset ecu or tcu themselves.

Thoughts? Theories? CLS is king of roll races
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PeterUbers

I think it is more about adaptations, with your new scanner can you customize adaptations like the dealer technician can? When you remove all adaptations it seems to remove all soft torque settings in every gear and all soft shift settings in the car is a beast again.

TMC M5

I Don't want to take your thread off topic (tongue firmly in cheek), but what is the story on the downpipes?

Pumpkinate

I wonder who would win a roll race on a slightly cool morning between an AWD E63 who had just done the key pedal dance reset vs a RWD CLS63 who had used the iCarsoft to do a reset?

PeterUbers

this begs the questions: at WOT do adaptations even matter or does the car simply provide the peak performance and peak shifting speed?

chiromikey

Since this thread began off topic I think it's a fair question! +1

Pumpkinate

I think you are right, it shouldn't make a difference at WOT

Chappy

Is the key pedal dance the same as what was once coined sneaky reset?

PeterUbers

yep

aka tcu reset
aka reset adaptations

Chappy

Ha ha.....both have a nice ring to it

Amg63-

Wow this thread is awesome.

kponti

No I don't think so. Just resets to factory defaults by erasing adaptations. I did not use star in the past to customize adaptations either.

The thing is even that did not make as much of a difference as the key pedal dance

kponti

Actually I do think it makes a difference at wot. Why? All my tests were comparing the cars responses at wot.
I pulled over on the side of the road to to the sneaky reset/key pedal dance. Got back on the road and immediately started roasting tires

kponti

I will start another thread on that next year. It was a combination of incompetence and impatience. But the parts were removed from the car a week or so ago. Now I wish I hadn't, but I don't feel like having it installed again
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PeterUbers

hmmm... roasting tires has something To do with throttle input and allowing peak torque to come in as early as possible to overcome the coefficient of friction and burn rubber... perhaps WOT itself is moderated by the adaptations or it's leaving peak torque limited based on adaptations in first gear ...

Georgee6086

I think the sneaky reset just Re calibrates the throttle blade witch gives you actual WOT. When you perform the reset the computer knows that when the pedal is all the way to the floor the TPS sensor gives a value and calibrates the throttle blade to that value. Think of when a throttle cable becomes stretched after awhile on an older car and you have to tighten the cable to get wide open throttle. I could be mistaken on this but this is just my theory.

kponti

You may be on to something. Let me redo the reset and check wot voltage. Before the reset I saw 90-92% under wot. Let's see what I get now

PeterUbers

So we should be doing the sneaky reset before all 1/4 mile or any timed runs ....

otherwise we are getting suboptimal results

kponti

OK just finished checking, checked WOT and got about 86% absolute throttle position. Did the pedal dance and rechecked wot settings and got an average of 88% absolute throttle position voltage. So no real change, but wasn't expecting any since I did the reset only a couple of days ago.
Still spin wheels on 1st and 2nd gears so that's good.

So interestingly, it doesn't seem like the reset affects the absolute throttle position settings. But I'm speculating that it affects how fast the throttle opens. It took 3 stages to get above 80% before the reset. It took 1 or two steps to do the same after the reset.

kponti

Brings me up to another thing I've been thinking about for quite a while. We talk a lot about torque control from MB be it in the ecu or tcu. But haw does MB actually achieve torque control? Throttle? Boost? Timing? (not fuel cos that seems to hit a good air/fuel target at all or most times from what the dyno wideband said after an hour and half driving on it).
Seems throttle might be the leading way I'm my speculation. Why? Well cos MB seems to have one of the most complicated throttle blade algorithms I've seen. Doesn't always make sense at all. Unless it's made to be the way to enact the torque management.... will explain the rather complicated algorithm is MB throttle platen settings.

PeterUbers

So it makes sense to do the key dance before any testing on the track or dragstrip... going from 75% throttle to 88% is significant

perhaps this explains just some of the variation in performance testing in the e63S

also may explain why some feel that they cannot achieve the reported 3.2-3.6 0-60mph benchmark in their own e63S'

and I assume dyno mode eliminates all these silly parameters

chiromikey

Is the procedure the same as it was for the W211?

PeterUbers

yep



1. Turn the ignition key to the on (not start) position.

2. Press the gas pedal to the floor and hold for five seconds.

3. Turn the key to the "off" position (don't remove the key), then release the gas pedal.

4. Wait at least two minutes for ECU to reset.

Amg63-

for step 1 will pushing the button without having to take the key out of the keyfob work?

Wickdwagon

I should have the car on the dyno in the next three days or so I would interested to see if following this procedure show any net effect. But the question I have are these resets done prior to tuning in the first place? As I would think that these "soft adaptations" could be sand bagging a tune.