[eschaider]

+1^ on what olddog said. The Mass Flow (MAF) based systems are the most precise and they adjust in real time for atmospheric changes like temperature and altitude without the need to re-tune the car. You can also change cams, throttle bodies and even cylinder heads and the MAF sensor has you covered because it is measuring actual air mass ingested by the engine, informing the ECU and letting the ECU make all the necessary fueling decisions to support the new air flow.

Another nice attribute is the fuel management when the camshaft overlap, we like for the 60's muscle car idle sound, creates idle and off idle fueling problems. The Speed Density and Alpha-N systems experience an unpleasant personality for low speed in traffic sort of driving. The MAF based system makes significant improvements over the other two fueling models in the engine's low engine speed personality while maintaining correct fueling everywhere else also.

If it is important to you, the MS3Pro P-n-P system uses all three so you have a choice although like olddog, having used all three, I have a Mass Air Flow bias. Almost forgot, another consideration is the MS3Pro P-n-P system supports a flex fuel engine operation if you add a Flex Fuel sensor in the fuel feed line.

The big deal about the flex fuel option is you can run it as a 100% gasoline enigine initially and later if you find ethanol availability you can fuel up with the ethanol and the sensor will measure the % ethanol, inform the ECU and the ECU will adjust your fueling map(s) for the actual ethanol content in your tank.

Later if you need to refuel and no ethanol stations are available, you just fill up with old fashioned gasoline and the flex fuel sensor detects 0% ethanol (or whatever small number it actually is) and the ECU automatically adjusts the tune for the new fuel. It's actually pretty cool and lets you experiment. The other thing is the ethanol brings a free-be 100 octane fuel to the engine for less than pump gas.


Ed