25det Afms In Gtr

[padey]

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.

[noone]

Nismo afm's same physical size as standard no need to upgrade piping etc but flow heaps more as have the z32 sensors in em from nengun etc not too exxy were on special last time I looked

[heller44]

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.

[heller44]

fm I'm lazy today.. couldn't even be bothered searching, just relied on anothers...

http://www.skylinesaustralia.com/forums/in...hl=rb25+afm+gtr

here is the answer.

[R31Nismoid]

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]

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.

[paulr33]

in order of supported power

pair of stock afms 65mm

pair of nismo's 65mm

pair of rb20/rb25 80mm

pair of z32s 80mm

pair of q45s 90mm

[R31Nismoid]

Paul, the Nismo and Z32 are on the same level, and would be more than an RB25/20 when you think about it because RB25 owners upgrade to a Z32 once they max it out

[paulr33]

my bad, you are correct 'ol wise one

[andz]

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 May 20, 2007 by andz

[Candy]

If you are upgrading to the 20/25 AFMs, go the RB20 ones as they are straight plug-in on a GTR, whereas the 25 will require you to do some wiring.

[700HP-GTR33]

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]

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.

[OFENSV]

If you are upgrading to the 20/25 AFMs, go the RB20 ones as they are straight plug-in on a GTR, whereas the 25 will require you to do some wiring.

i thought rb20 and 25 were exactly the same?? is this not the case?

[paulr33]

rb20 and rb25 series 1 = same plug

rb25 series 2 = different plug

i dont think either will mate up to GTR

[andz]

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

nismo's rated them @ 570kw..so i just insert it into paul's table

just an indication

r u sure they're IDENTICAL?

[R31Nismoid]

Well ive already said it twice in this thread

What do you think?

[raz0r$harP.UK]

rb20 and rb25 series 1 = same plug

rb25 series 2 = different plug

i dont think either will mate up to GTR

RB20/RB25s1 AFM plugs are the same as GTR plugs.

[tacker]

yep i have 2 RB25 AFM on my R32 GTR with Power FC, same plugs connected straight up

Edited May 20, 2007 by tacker

[700HP-GTR33]

rb20 and rb25 series 1 = same plug

rb25 series 2 = different plug

i dont think either will mate up to GTR

The RB20 and RB25 series 1 must be the ones I fitted...direct plug in.