Question on RB25 Series 1/2 AFM & ECU

[RB30-POWER]

Hey Guys,

I understand that the Series 2 RB25DET has a different plug on the air flow meter as compared to the Series 1 item.

The Series 2 has 3 pins?

How many has the Series 1 got?

On the wiring diagrams i have, they only show 3 pins in use. (Maybe its a Series 2 diagram?)

If they had different amount of pins/connections how can a powerfc be used on either series?

What i am getting at is, can i use a Series 1 AFM on a series 2 ECU, if i change the plug?

Do the series 1 and 2 AFM both have the same resolution? i.e 0-5v scaling

Also while we are at it, does anyone have specifics if the series 2 ecu has better maps than the series 1? What was changed between the two, anything?

[BHDave]

My series 1 had a 4 pin plug. I know what you mean about the wiring diagram, i had one that was definately series 1 as it showed the ignotor but still showed a 3 pin plug on the afm.

Of the 3 pins, 2 will run into some sheilding and back to the ecu, the other will be power.

The 4th wire is a ground if you have it so you simply have to earth it if you hook into the series 2 loom. I found that it ran back to the earth point at the front of the intake manifold.

[RB30-POWER]

What did the RB20 have, a 5 pin plug?

Looking at the diagram, even on the 5 pin AFM's, one of the pins is not utilized?

There is two Green Label AFM's right, one 4 pin and one 5 pin?

And the resolution is the same between all these AFM's?

(i.e x amount of air = y amount of voltage, with the x and y being the same values on all of the air flow meters.)

Just trying to clarify a few things once and for all

[BHDave]

I think my rb20 had a 4 pin plug aswell but i never really paid much attention to it. Sorry.