Reply to "Adding Speed Density to IR EFI?"

The IR EFI that we have been discussing is essentially speed density depending upon who's ECU you're using and what it's doing with the sensor input. The only thing at issue is the MAP signal. Speed density relates to how the algorithims utilize the sensor input to generate and access the look up tables. As mentioned, IR makes accessing a meaningful MAP signal more difficult. I did a quick search and turned up this article.

It compares N Alpha, Speed Density, and MAF. It also talks about the challenges to speed density in more agressive street engines and blend modes.

Have a read. It's actually a pretty good short summary and addresses your questions.

Kelly

http://www.carcraft.com/techarticles/electronic_fuel_injection/