Do I need an Air Flow Meter?

[automoton at iname.com]

Hi all, 

  I'm in the process of putting an engine in my car, an '87 MR-2.  I've looked at the AFM, a flapper door type, 
  and decided that it is very restrictive.  I'm contemplating building a circuit that looks like an AFM to the
  computer.  I will link this circuit to the throttle linkage.  I know that the computer needs this information, but
  isn't it using it to measure how much load is on the engine, ie. More load = more vacuume = more open AFM
  door?  Instead of the computer determining load, the driver will determine it by how much he presses the
  petal.  Think of it as a variable substitution into the fuel equation.

  If that wont work, how about this.  Then I get a MAP sensor and make an op-amp circuit which maps the
  outputs appropriately.  A MAP is a lot less restrictive than an AFM.

  Since the car isn't running yet, I've had a lot of time  (too much?) to think about things like this.  I've also had
  the oportunity to learn about just about ever major system in it.  The car is a project car, so when it is running,
  I can do whatever modifications I care to do.  That is, it's not my daily driver.

  Look forward to your comments. 

  Mike Diehl 

Mike Diehl
87NA 7afe, dual exhaust & custom headers
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