I finally managed to get a 0-100 run, and despite a soggy launch it did it in 8.7 sec.
Time and speed is based on the HP scanner so I'm not sure how accurate that is, but it's all have. I started counting when the front wheel speed was .01, and my speed up top is pretty much spot on, per my gps, since I have larger tires in back to compensate for the oem error.
Using a different run a couple weeks ago, which was from ~85-130, I added that to estimate 1/4 mile. It does 0-120 in 11.71 sec, and comparing to some E550 runs I found online, like one car that that did 11.708 @ 119.22, it seems like my time would also be 11.7. Fingers crossed the HP Scanner is accurate enough for this sort of thing...
I think that's pretty good considering it was likely a 15sec car before I started messing with it, thanks to some serious mystery issue.
Stock is supposed to 13.0 @ 108, per automobile-catalog.com/make/mercedes-benz/207_e_class_sports/c207_2/2016.html
Now I hits 108 in 9.77, and in 13 sec I'm at 126.7.
Other than the HP Tuning I did, the only mod is K&N Filters and I'm running 50% Ethanol. All orig parts excluding new coils, plugs & IC pump.
The last month I started documenting time it takes to get to each 10mph increment, and what speed I hit after one second starting at each 10mph increment.
Eg; 90-100 takes 1.17, and 90 +1 second is 98.8.
I was hoping other M278 drivers have saved similar data to compare? Anyone use HP at the strip to see how it compares? Or compared to a Dragy? I'm aware 11.7 seems like a stretch, especially considering my launches are weak and 60ft times are no doubt 2sec. So I'll take any info, data or input anyone has.