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 |