Originally posted by Smokeshow:
Originally posted by bnoon:
Originally posted by RTStabler51:
Greg are you saying that a specific vehicles factory MAF is not calibrated for X size injectors that come in the car and that the injector size is programmed into the PCM and it does whatever it does?

Say for example if I was going to put 24# in my car, and I added a say a 96-98 or Mark VIII MAF to corralate (sp?) with the injectors.....would that work?

Or is my thinking wrong?



I'll tried to dumb it up as much as possible... No offense to you or anyone else...

Your thinking is wrong. MAF tables are made up of calculated values of air that pass through the MAF at certain transfer voltages on a flow bench. These MAF tables are engineer set values in the ECU once they are figured out on the flow bench. Now, with those known flow numbers, engineers can make calculations on the intended engine size, cam duration, intake volume, intended load, etc. etc. etc. to make a base calculation in the ECU before heading to an engine dyno. For X amount of air, you will need Y amount of fuel from your Z sized injectors. (there are also many variables to calulate load too, but they're all based off of this very basic principle of air and fuel)

You change the size of the injectors, you have to make changes somewhere in that A/F equation. The way the MAF guys make their changes to "tune" for larger injectors is by adding resistance to the transfer circuit. Instead of needing Y amount of fuel for X amount of air, the MAF tells the ECU that it's getting the original amount of air minus a percentage increase in injector size. X becomes .8X amount of air, requiring only .8Y amount of fuel, from 1.2Z sized injectors.

One MAF that came on a car with 24# injectors does not have to equal another MAF that came on another car with 24# injectors, electronically or in physical size.



See now this makes more sense to me than what you said before. Still differ on some things.. but non point in arguing...



This was my first post on this topic. Please, don't hold back. Nobody is arguing that I've seen, we're discussing...

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