Resolution of Z32 AFMs on GTR

[Gav]

As part of a planned upgrade, I will need to change out the std AFMs on my GTR. I already have a PFC fitted.

Common practice/recommendations appears to be to use Z32 AFMs. I am worried, however, that these may be too large to give good resolution for tuning at part throttle/cruising.

Given that I had a single RB25 AFM on my old S15 that supported over 200 kw ATW, would a pair RB25 AFMs be a better choice for a "moderate" upgraded (say 300 kw ATW) GTR?

[2BNVS]

im not to sure but most of the gtr's i seen have Z32 AFM on them, interesting post coz im also interested in knowin for future plans...

info any one?

cheers...

www.freewebs.com/2BNVS_r33

[sidewaymambo]

Originally posted by 2BNVS

im not to sure but most of the gtr's i seen have Z32 AFM on them,

NO..

however can put on..

[ph1]

2x rb25 AFMs should be fine for 300kw at the wheels.

[GTS-t VSPEC]

Gav, I might have an RB25 AFM:D Steve(SST) said it was a nice upgrade:D

[R32-GTS]

Easiest upgrade is 2 RB20afm's or series 1 RB25 afm with the 5pin. These plug straight in with the same plug. The z32 have different plugs.

[Gav]

Bugger - sold an RB25 AFM (off my old S15) recently.

BTW - anyone know if the RB25 AFMs have the same bolt pattern (for the air cleaner) as the GTR ones?

[Sydneykid]

Hi Gav, Different bolt pattern, too big in diameter, 80 mm versus 65 mm so you will need an adaptor plate, we use sheet aluminium, although 2 X pods in a CAI are easier.

No problem with low rpm resolution, the PFC copes very well. Done it heaps of times. Following has been our experience...

-------------------RWKW----------RWKW-----BHP--------BHP

#of AFM's------------1-------------2------------1-----------2

RB26---------------149------------299--------271--------474

RB20/25------------226------------453--------376--------683

Z32-----------------262------------523--------424--------779

Q45-----------------302------------605--------479--------890

You really only need to upgrade the GTR AFM's if you are going for 500 bhp or more.

Hope that helps

[Gav]

Thanks Sydneykid - as usual your advice is both very useful and to the point.

Cheers

Gav

[williamsf1]

so am I right to assume that I need to make up some sort of mounting plate for the RB26 to use the RB25 AFMS but (mine being 5 pin plugs) will plug straight into the stock one?

[RedRocket]

Does that mean you can use an RB20 and RB25 AFM together for a GTR upgrade??

ie. are they identical?

[R32-GTS]

Im pretty sure u can.