RX7 AFM

There seems to be some mystery surrounding the RX7 AFM. This AFM has been used as a cheap replacement for the stock 3SGTE AFM (US market). We will cover here the differences, and lay to rest (hopefully) any mystery regarding this AFM.

SPECS:

87-88 MAZDA RX7 (NON TURBO) Mass Air Sensor

NipponDenso Part #17100-3250

PERFORMANCE:

This AFM is roughly close to the stock AFM. While some have claimed a better feel, no performance figures have been produced.

GAINS:

No gains have been reported, other than "it feels nice". In an otherwise stock car, top end would be improved slightly.

INSTALLATION:

The AFM is virtually identical to the original on the outside. Your stock air box or aftermarket intake should bolt on.

TUNING:

The response may be different on the RX7 afm. We will show later how to adjust this.

TESTS:

Here are the spec outputs from the MAZDA AFM vs the TOYOTA AFM. You can see that they are virtually identical. We will report more as we find it.

RX7 3SGTE
Voltages:
VC - E2 4.5-5.5V 4-6V
VS - E2 (Flapper closed) 4V 4-5V
VS - E2 (Flapper full open) 0.02-0.5V
VS - E2 (Idling) 2.5-3.5V 2-4V
THA - E2 (at 68degress F) 2-3V 1-3V
Resistance:
VS - E2 (Flapper closed) 50-500 200-600
VS - E2 (Flapper full open) 50-500 20-1200
THA - E2 (at 68 degrees F) 2,000-3,000 2,000-3,000

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