[Diy_efi] Newbie with a simplified Motronic project

[bcroe at juno.com]

The issue is not about changes in the sensor, its about changes 
in your engine.  Cam, carb, intake, headers, boring, etc.

A closed loop sensor will fine tune any system steady state, but 
won't be able to adjust open loop situations.  

A MAP "assumes" certain engine breathing, but can't actually 
sense any changes you have made.  A MAF actually MEASURES 
the air coming in, so changes will be detected and at least 
partially compensated for even in open loop situations.

Bruce Roe

On Fri, 1 Nov 2002 02:13:29 -0500 Eric D Byrd <klox at juno.com> writes:
> One thing I don't get about MAF vs. MAP.  Everyone's making out like 
> MAF is self-correcting, and never any longer any need for fuel trim 
> tables. 
> How?  Both are sensors, that respond to a physical phenomenon by
> generating a voltage, and all such devices experience variations in
> response due to age.  MAF is no different.  The fuel map in the ECu 
> is fixed, and eventually the MAF will signal a slightly different value

> for the same air flow, and the ECU will send a different fuel pulse.  

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