Camaro XV

[PTAddict]

Originally Posted by mikels

MAF sensor allows more precise air measurement as well - when you think about it, mass air calibration is calculating the mass air flow from MAP, displacement and RPM to determine engine operation. Better to measure actual mass flow and redundantly calculate for better control.
Dave

Thanks again for the detailed response and willingness to share. Those additional E67 sensor inputs make sense - similar actually to what I see with the late model Mustang GT500 tunes we've done, although the Mustangs are messier because of the "torque demand" throttling strategy.

I completely agree with all you said, but I think you might have meant to say that Speed Density calibration is calculating mass air flow from MAP/RPM/displacement? I'd completely agree that a properly calibrated MAF sensor is not only precise, but also provides compensation/insurance against all kinds of other variables that affect air mass (intake manifold heat, intake valve temp, spark variation due to knock retard, etc).

[mikels]

Originally Posted by PTAddict

Thanks again for the detailed response and willingness to share. Those additional E67 sensor inputs make sense - similar actually to what I see with the late model Mustang GT500 tunes we've done, although the Mustangs are messier because of the "torque demand" throttling strategy.

I completely agree with all you said, but I think you might have meant to say that Speed Density calibration is calculating mass air flow from MAP/RPM/displacement? I'd completely agree that a properly calibrated MAF sensor is not only precise, but also provides compensation/insurance against all kinds of other variables that affect air mass (intake manifold heat, intake valve temp, spark variation due to knock retard, etc).

Thanks for catch - corrected my faux pas!

I think most OEM's are using similar strategies for forced induction - it allows much better 'picture' of engine operation and more hooks for control.

OEM software and calibrations calculate injector tip temperature, intake valve temp and many, many other parameters that impact engine operation - all this results in more precise control (and closer operation to the edge while maintaining safe operation).

Dave

[PTAddict]

Originally Posted by mikels

OEM software and calibrations calculate injector tip temperature, intake valve temp and many, many other parameters that impact engine operation - all this results in more precise control (and closer operation to the edge while maintaining safe operation).

Dave

Sorry, but this is BS. According to many of our muscle car era customers, all you need is a box full of carb jets and a timing light OK, maybe also a flashlight to inspect plugs.

It is actually amazing to use software like HPTuners or EFILive on a modern ECU. The number of of different aspects of engine/transmission operation that are modeled in these on-board computers is mind boggling, and yet they all make sense when you take the time to understand them.

Sorry to divert the main Camaro XV thread, but I just love this stuff.

Now, if only we could use a computer to tune out the inherent disadvantages in handling/braking/areo of a 69 Camaro!

Scott