Keith, Cerveza v10 updated one of this older posts with the A/F ratio. I am not certain that the fuel map is still unchanged. On a purely MAP based system, the "fuel map" would not have changed when referencing atmospheric pressure as seen during a WOT pull. If this was truly the case, this car would be running way lean. However, I understand that you Gen IV folks have a combined MAP/MAF system. While I have never seen the MAF sensor on a Viper, Dan Lesser has posted some info regarding this Gen IV's MAF sensor.
Apparently, the PCM is still able to meter the increased air flow and provide a suitable fuel flow to meet the demand.. Cerveza 10's is proving that the PCM is effectively "adapting/tuning" real-time and still maintaining a safe A/F ratio. This adaptive behavior is not present in my Gen III. After heads/cam install, I took it around the block on the OEM tune. At WOT, I would immediately start leaning out on anything past 3000 rpm. In other words, my Gen III PCM was not adapting to the increased air flow (as expected). On the other hand, the Gen IV's appear to do this seamlessly.
I am just a tree shade mechanic making meager inferences. Perhaps some of our experts can weigh in on the subject matter.
Thanks Andres, I missed that.
Very interesting about the Gen IV ECM. Makes sense. I've been dealing with speed density so long I keep thinking of WOT fueling in terms of a fixed MAP/RPM fuel map.
There is obviously a lot of extra capacity in the fuel system. However, I wonder at what hp level/air flow the ECM says that's enough and goes into engine protect mode. Given how sensitive they are, I never would have expected you could get away with 630+ hp at the wheels. Good stuff though.
There will be more to come for next year.... I started taking it apart last night!
