ACCELL GEN 8 vs BS3

[Blown353]

Hey Jim, maybe you can answer this, because I've never got a satisfactory answer elsewhere (including the EFI Live & HP Tuners support forums) and you appear to have the experience:



How does a factory ECU handle barometric pressure changes with a speed/density operating system in a forced induction vehicle? There is no longer a MAF sensor which can easily determine realtime air density, and the ECU can't take WOT MAP reading to update the baro parameter in a forced induction combination (and that's not the best way anyways, even naturally aspirated.) As far as I know, there is no 2nd real time atmospheric MAP for real time barometric updates with a factory ECU.

BS3, Pantera, and Megasquirt for example all have the option of second MAP sensors for realtime barometric updates.

This is very important for me as I can drive from sea level to 9000' in 2 hours on the same tank of fuel without ever shutting the car off, so I need a way to update the barometric pressure without a key off/key on refresh of the barometric pressure at startup.

I initially threw out the option of using a factory E38 ECU in speed/density with my new twin turbo LS2 simply because nobody can give me a satisfactory answer how a dramatic altitude change in a forced induction is handled without the MAF sensor other than a key off/key on cycle... but I'm all ears!