Ran a c63 AMG the other day
So I'm sitting at a light at the front heading into a local land bridge that goes across the bay when a black c63 pulls up next to me and revs his car and lunges it forward a foot or two. I turned off the AC and rolled forward to line up with him. I tapped the left paddle to drop into first and almost immediately the light goes green. We both roll off the line and punch it (no launches) and I immediately jump out by a fender length and keep on pulling. I didn't let off until about 145 and by that point he was far enough behind that I was watching him in the rear view mirror. I'd estimate about 3 cars back.
Onto run #2.
We cruise near each other for a couple miles and then line up again and slow down right into the sweet spot where I'm at about 3500 rpms in 2nd rolling. We roll down Windows and I do the three count. As soon as we punch it again I jump about a fender length ahead and as i heard the c63 shift up he dropped back and the 55 kept pulling. This time we ran to around 120 and again I was looking at him in my rear view.
After we slowed back down he pulled up with his windows down and we talked for a second. The guy and his passenger asked if I had a chip and said they were originally expecting to win. I told them I had a pulley and a tune and we parted ways. Overall a good run and good guys and for the record I have a 77mm fixed pulley, auxiliary heat exchangers, and a tune by Tony Lawshee.
I had those same issues with different tunes on both cars I'm running the FSP on at one point or another in the tuning process. We have pretty much the same mods then, I'm running kleemann cams as well. The tuning from my understanding is very sensitive to getting the bypass valve / map sensor / air fuel all tuned to there tolerances of each other.
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He didn't