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Originally Posted by Max777
/\ This is all very interesting stuff, thank you for the sensor explanation...
As far as tuning is concerned, does it make it easier to tune a car if you keep the MAF, or is it a significant enough intake restirction that it's advantage is overshadowed by the intake restriction?
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Tuning the fuel map with the MAF is very easy. It is also very easy to tune the fuel map with a MAP sensor. Ignition Timing with a MAF is a little more tricky, especially on a turbo engine. Boost enrichment is also difficult with a MAF tune.
Ususally, OEMs that run MAF-based systems on turbo cars also have a MAP sensor to control ignition timing and fuel enrichment more accurately.
The beauty of the MAP sensor is that you can tune all the maps from the same sensor, without any need for the MAF as long as you have the ability to adjust your fuelling for your engine (basically anything but a stock ECU).
The MAF does make restriction in the intake. I have never quantified it on a dyno, but it meant the difference between spinning the tires going into second or just chirping them.
Creating restriction on the turbo inlet as a means to control boost creep is dangerous at best. That can cause the turbo to go into surge and/or overspeed. Wastegate porting is a much better idea.