Originally Posted by HDDP
Just my semi-educated opinion (and that of the Bosch Engineers) as mentioned in other threads... In laymans terms, you can dump more gas or more air, or both into this engine and it will not produce noticable HP gains because the Bosch ECU / PCM and sensors are programmed to maintain stociometric AFR... So, the timing will be retarded, fuel will be trimmed to keep it there...
Until you manipulate (tune) the ECU to override the OEM programming, you'll be pissing in the wind...
I'm surprised you guys haven't been searching the earlier threads regarding this issue...
That's why I bust ***** when people start talking about intakes, exhaust, etc. to make more HP in this car, without thinking about the Engine Management Systems that control it...
I think this ECU does a GREAT job of adjusting to mods. Check out my ASP pulleys thread and it is odvious this ECU is more than capable to adapt and overcome mods. I was told by several tuners familiar with the car that the ECU can adjust for up to 20%.
Shawn,
Did you give your car time to adjust to the new mods? How many miles did you drive on the new setup before dyno'ing? I noticed more improvement with my intake and pulleys after several hundred miles was driven with them on the car.
BTW don't let the dyno do the talking...take her to the track and do some before and after runs. My car dyno's really low IMO but my track times tell another story.