1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

airflow meter

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Old 03-30-02 | 12:44 AM
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DJ!
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Question airflow meter

im droping a 13b turb out of a 1988 into my 1st gen, is there a way to bypass the airflow with the factory ecu?? or is there a way i could hook up a map sensor out of a 3 gen to it with the factory ecu??
Old 03-31-02 | 12:34 AM
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DJ!
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please someone??? help??
Old 03-31-02 | 12:40 AM
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There is a box you can by that converts the AFM to a map, but the box is around $700.
Get a Haltech or similar is the better way.
Old 03-31-02 | 11:42 AM
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From: 3OH5
Re: airflow meter

Originally posted by DJ!
im droping a 13b turb out of a 1988 into my 1st gen, is there a way to bypass the airflow with the factory ecu?? or is there a way i could hook up a map sensor out of a 3 gen to it with the factory ecu??
Max is right. The stock AFM is needed because I believe Mazda uses an air density sensor in its air flow meter.

I don't thnk you could get anything reliable out of the ECU with the air-flow meter bypassed. The third Gen ECU will be even more of a Pain in the ***.

Get a Haltech F9 (fuel only), a 1st Gen Dizzy with the advancer weights tack-welded so they don't advance,
retard the timing about 3-5 degrees, and run without problems.
Old 03-31-02 | 11:47 AM
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The AFM is what actually measures the airflow going into the engine, without it the computer has no clue how much air goes into the engine.

Spee-density systems (FD, most aftermarket computers) don't measure airflow, they CALCULATE the airflow based on RPM (speed), manifold pressure/temperature (density), and known characteristics of the engine. That's the problem with speed-density - if you change the characteristics of the engine, say by porting, or a different exhaust, or a different intake - you screw up the calculations. That's why you can't mod an FD and keep the stock computer. Meanwhile, FC guys with the airflow meter computers just have to make sure they don't hit fuel cut
Old 03-31-02 | 11:55 AM
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From: 3OH5
Originally posted by peejay
The AFM is what actually measures the airflow going into the engine, without it the computer has no clue how much air goes into the engine.

Spee-density systems (FD, most aftermarket computers) don't measure airflow, they CALCULATE the airflow based on RPM (speed), manifold pressure/temperature (density), and known characteristics of the engine. That's the problem with speed-density - if you change the characteristics of the engine, say by porting, or a different exhaust, or a different intake - you screw up the calculations. That's why you can't mod an FD and keep the stock computer. Meanwhile, FC guys with the airflow meter computers just have to make sure they don't hit fuel cut
I knew there was a reason, but I could not explain it fo rthe life of me. Back when I was still exploring the Turbo route, I knew that it was going to be a PITA.
That's why an aftermarket ECU will make all the difference now.

Oh, and PeeJay, thanks again for clearing it up.
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