Depending on the ECU (my experience is with MSII) the MAP sensor is used as one of several inputs to calculate the actual air being ingested by the engine. It is also used, on startup, to determine initial ambient air pressure (altitude). A 2nd pressure sensor could be added to determine air pressure/altitude continuously. That would be plumbed to the atmosphere. The MS handles both configurations just fine.
I suspect that a MAF sensor could take the place of the MAP sensor to determine the air volume flow. Heck that is what it is designed to do. However, for a boosted conversion I doubt that the N/A MAF could be calibrated properly. One could always use the MAF from a different engine but that would require access to tuning tables within the ECU. I have no experience in that, although I can imagine it being done.
The TPS and the MAP sensor can be also used to determine instantaneous load changes that would momentarily require more fuel like an accelerator pump would do. The MS lets you even blend the two inputs under various conditions if desired, both in accelerate and decelerate condition (my physics teacher would call me on using the pseudo-word decelerate
). The TPS is monitored and can be used to clear a flooded engine if necessary.
The bottom line is not the actual plumbing, but what ECU is being used and what controls a person has to tune it. I am a big proponent of the MS system, but if an OEM ECU might be used, then why not try? if going that route, then whatever plumbing scheme it was designed for should be used IMO.
I think all of the differences in this discussion are due to different perspectives and personal experiences. What's the worse thing that can happen here? The engine doesn't start and the system needs to be rethought/replumbed or maybe it even blows up. The best thing is that it works just as John expects it to. Let's grab a
and see what happens.
_________________
Chuck.
“Any suspension will work if you don’t let it.” - Colin Chapman
Visit my ongoing MGB Rustoration log:
over HEREOr my Wankel powered Locost log :
over HEREAnd don't forget my Cushman Truckster resto Locostusa.com/forums/viewtopic.php?f=36&t=17766