Anyone know the limitations of the MAF sensor on the 7A motors. I am most interested, in what the maximum value it can read (ie: 100gm/sec, 200gm/sec, etc).

It had voltage levels, but did not indicate what the unit of messurment was, or what the values should be. If all else fails, I will likely end up hooking a DVOM up to it, and trying to do some math on the engines airflow, and corisponding voltage.

I was hopeing someone might know, and coould save me some time.

It only knows voltages. 0-5 volts. I could maybe get you a max cfm flow number for the housing, but it won't be before next month. The sensor should output near the upper end of that 0-5 volt range when the engine is flowing it's max (WOT at high RPM.)

I'm not exactly sure what you are looking for. What are you planning on doing with this information? I might be able to be more helpful if I knew more about what you are doing.

I'm trying to figure out at what point the stock sensor will stop sensing air. The CFM on the housing is not so much of a concern.

This is for a potential experment, to turbo charge a 7A (yes I have read all the threads). If I know exactly when the stock MAF is done sensing the air coming in, I will have a few more options for fueling above that point, and pulling timing out. But getting a ball park as to when it does this, will help greatly. Since my car is currently not running, testing it is not an option. If my car was running, I could hook a dvm up to it, and see at what RPM under full load certain voltage points are, and then figure the engines airflow requirments. If no one know, no one knows. I thought it was worth asking, since I cannot do any sort of testing right now.

...MegaSquirt?

Someday my coupe will have a turbo of some sort. Currently favoring a frankenstein 20vt over a 10vt swap, but whatever it is, it will be run by MegaSquirt. I love building stuff like that. :)

I really haven't descided on what route to go yet, dealing with spark is also an issue. But the injector sizing I keep seeing, doesn't seem to mesh with the output of the 7A, I am wondering if the MAF is equilly off.

I would rather gather information, that turns out to not be usefull, rather than be uniformed. MegaSquirt is likely what I will end up doing, since I am trying to do this on the cheap. (blew a head gasket two weeks ago, I figure if its coming apart, its not going back together unmodified.)

I thought the Bentley listed a "significantly" lower cc/min rating than what a few people have posted. The injectors should be in the mid to upper-20lb/hr at 3.8-4.2bar system pressure going from memory.

Injector values I found from a thread on the rennlist mailer, indicated 32pph at 4bar. That number seems awfully high for a 2.3L motor only making 164hp.

People are just using the factory specs wrong, and converting flow rates around too much.

The injectors should be closer to 25lb/hr at 3bar, but the 7A runs fuel pressure higher than that, which means the injectors actually flow less than that at 3bar, could be as little as 19lb/hr @ 3bar, which would be more like a 25lb/hr injector @ 4bar.

guesses.