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R32 GTR with RB25 AFMs

itbmils

By itbmils,
in Engines & Forced Induction

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itbmils Proficient

itbmils

Posted
Posted

All

I've just done a full engine rebuild on my R32 GTR (almost run in now) and I'm planning on taking it to the next level. I have the following bits ready to install

PCF + HC

Tomei Adj CAM gears in/out

HKS 550cc injectors

I've just picked up a pair of RB25 AFMs (herd they were a cheap upgrade) and I was wondering if ....

the PFC has a setting for these

can I swap them for the std AFMs before fitting the PFC

Anyone know where I can get a piping kit for these to suit my GTR - I have pods (Ms I think) can I keep those and just swap the pipe between the pod filter and the AFM

will I also need to swap out the hose between the AFM and the turbo (flexible ?)

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https://www.sau.com.au/forums/topic/69793-r32-gtr-with-rb25-afms/
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scottgtr Newbie

scottgtr

Posted
Posted

Yes the power fc has a setting for the rb25 afm's. i highly doubt that you would be able to buy a bolt on intake kit to suit though, you will probably have to get something made up and there is no reason why you couldnt use your current pods but due to the larger diameter of the afm's they probably wouldnt be big enough. As for fitting them before the power fc, i dont think it would be overly wise due to the standard computer not being tuned to suit, i personally would wait untill i got the ecu in. Ive heard that the rb25 afm isnt all that good on a rb26 due to the fact that they cant hanlde as much air up in the higher revs and the calibration is slightly different. I personally would (and have) opt for a pair of z32 afm's. I hope that helps you out a little.

paulr33 Grand Master

paulr33

Posted
Posted

I dont believe the stock ecu will support them. If you have the new powerfc, then option 4 under airflow setting lets you use twin rb25 afms. Im not sure what the value is for the older powerfc (as in the one that came seperate with the hand controller).

The newer powerfc supports:

Option 1: BNR33 Normal

Option 2: BNR32 Normal

Option 3: Power Intake

Option 4: 80(squiggle O) RB25 Air-F (twin rb25 afms)

Option 5: 80(squiggle O) VG30 Air-F (twin z32s afms)

paulr33 Grand Master

paulr33

Posted
Posted

Rule of thumb for Air Flow meters RWKW & Engine BHP

------ ---- OD ---- RWKW ---- RWKW ---- BHP ------ BHP

No of AFM's ---- ------- 1 -------- 2 -------- 1 -------- 2

RB26 ------ 65 ------ 149 ------ 299 ------ 271 ------ 474

RB20/25 --- 80 ------ 226 ------ 453 ------ 376 ------ 683

Z32 ------- 80 ------ 255 ------ 511 ------ 415 ------ 763

Q45 ------- 90 ------ 302 ------ 605 ------ 479 ------ 890

7heavn Experienced

7heavn

Posted
Posted

rb25 afm's on mine with the PFC and 2530's . Car did run with rb25 afm's straight up but not well and was tilt trayed to the tuner . If your only looking for 300rwkw then they will have plently of headroom . pnblight on these forums only maxed his out at close to 500rwhp on his 33 GTR .

  • 2 weeks later...
Ants Grand Master

Ants

Posted
Posted
very good work - RB25's will be fine for me - target is only 280-300rwkw

Mate, I managed to get 297rwkw with my standard GT-R a/f meters, I have RB25 a/f as well but could not put them on yet because of the same reason you do i.e. piping and pods do not fit.

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