Originally Posted by Chi-Town SRT/6
So how smart is the Benz ECU? Smart enough! The car's A/F was running conservative! And there is about 20 RWHP to be gained with a good tune.
As you will see with my attachments the car is around 12.5@3,500 and goes down to 11.60-12.0 close to redline! She was protecting herself all along. I had a GUT feeling the car was running nicely but this takes that little monkey off my back.
The tune was done on a mustang dyno (which are known to be very conservative) shown in the link below...
http://totalpowerperformance.com/dyno
I made 291 HP and 286 TQ on my first run and little less on the second. The tuner said on a dyno jet it would read around 350ish on both sides. So ASP was about right on the 20-25 RWHP gain after you consider the intake.
Below are the attachments...
Attachment 5625
Attachment 5626
Attachment 5627
Attachment 5628
I don't know if a Dynojet vs a Mustang Dyno would net you a extra 60 whp. I dyno'd on a Dynojet and put down 290 whp 100% stock. A mustang vs dyno usually is 20 whp lower on average... though the extra 60 whp would explain the drop of .7th in the 1/4 mile.
Glad that you did the check on the a/f's I would probably want to keep them around mid 11's just for the longevity of the engine as a whole.