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25det Afms In Gtr

padey

By padey,
in Engines & Forced Induction

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padey Community Regular

padey

Posted
Posted

I searched around without success.

I've reached about 95% on my AFMs and I'm looking to upgrade. I have a PFC about to go in.

Z32 appears to be the standard upgrade, but that's larger then I need. I was wondering if RB25DET AFMs would be a good upgrade. I gather two 25DET AFMs will flow more then the R32 GTR items????

Anyone done this change? Or any other suggestions.

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https://www.sau.com.au/forums/topic/169320-25det-afms-in-gtr/
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heller44 Mentor

heller44

Posted
Posted

I'd like to know the answer as well..

I searched around without success.

I've reached about 95% on my AFMs and I'm looking to upgrade. I have a PFC about to go in.

Z32 appears to be the standard upgrade, but that's larger then I need. I was wondering if RB25DET AFMs would be a good upgrade. I gather two 25DET AFMs will flow more then the R32 GTR items????

Anyone done this change? Or any other suggestions.

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

Just get twin Nismo AFM's.

The are a Z32 sensor, in a stock AFM housing.

Therefore they bolt up to the factory piping. This is a key factor as it saves $$$ having to redo all the cooler piping and a lot of dicking around.

The Nismo AFM's are the next step up from the stock RB26 AFM's

heller44 Mentor

heller44

Posted
Posted

Re-doing the afm piping isn't an issue as I was looking at reolacing the lot with stainless, just interested in if the rb20/25 afm was a workable upgrade or not.

Considering that I will only be paying for the materials, not the fabricating, the rb20/25's might work out cheaper than buying a pair of nismo afm's.

james.

andz Mentor

andz

Posted
Posted (edited)
rb20 and rb25 afm are same size and same calibration.

Rule of thumb for Air Flow meters RWKW & Engine BHP

added nismo afm onto paulr33's table

------ ---- 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

Nismo----65------------------570

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

Edited by andz
700HP-GTR33 Mentor

700HP-GTR33

Posted
Posted
I searched around without success.

I've reached about 95% on my AFMs and I'm looking to upgrade. I have a PFC about to go in.

Z32 appears to be the standard upgrade, but that's larger then I need. I was wondering if RB25DET AFMs would be a good upgrade. I gather two 25DET AFMs will flow more then the R32 GTR items????

Anyone done this change? Or any other suggestions.

Yes,

I have put 2 RB25afm's on my gtr...bought for $200 dollars...second hand off a member of this forum...got them fitted...modified old intake.

Had to buy 2 adaptors from Just Jap Sydney $80.....total...

So was in for cams and retune anyway...so fitting was $200(That is cutting the Tomie pipes that were there...installation of some adaptors as mentioned and

some silicone hose and clamps....it all looks good...total cost..

$480.....

If I knew this before...would have bought the Nismo items.......direct bolt on...lol...I did not need new plugs.....

Z32's require...plug adaptors.

If I find my post I will give you a link.

R31Nismoid Grand Master

R31Nismoid

Posted
Posted
added nismo afm onto paulr33's table

------ ---- 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

Nismo----65------------------570

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

Nismo/Z32 are identical. So not sure what your getting at there.

And that above table is wrong.

I made 270rwkw on PULP with a Z32 and it was nowhere near maxing out. Same as a lot of other peoples.

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