Nismo AFM vs Z32 AFM

[kc]

From my understanding, the reason for using a pair of Z32 AFMs on an RB26 is to be able to 'measure' more air flow (through a different calibrated hot wire), not necessarily to reduce the air flow restriction.

And that the original 2x 65mm RB26 AFMs can flow 700+ HP physically - even if they can't measure it.

Therefore the Nismo AFMs at 65mm dia, given they have a recalibrated hot wire element to be able to measure 700 HP, will pose no more restriction to air flow than the 80mm Z32 versions - up to 700hp.

Can someone just confirm what I'm saying, given I'm looking at buying the Nismo AFMs.

Cheers all

[JAGR33]

I'm sure you are right, I have Nismo AFM's on my GTR, they handle the 335rwkws, and don't have to wire in a 300zx plug and change intake piping to 80mm....

Great upgrade!!!!

[meshmesh]

Firstly, can I ask whether you're planning on upgrading your turbo's..assuming this is for a GTR? Coz the stock AFM should see around 280-300kw at the wheels before they max out "voltage wise".

Secondly, the Nismo's units are a straight easy fit, compared to the Z32 AFM, which require new plugs and in some cases, minor mods.

[Corse]

I've was offered a set of MINE'S AFM's and I'm wondering the same thing.

Surely there has to be a powergain by going 85mm as there is a very large difference in cross sectional area.

[SS8_Gohan]

I've been meaning to ask pp this but why are Z32 AFM's so popular? When ever ppl list mods to their cars, or you're looking at cars for sale or just the general rate-my-car type sites, the Z32 AFM is listed down on soooo many mod lists?? I'm assuming this is from the 300ZX of the same era as the R32? What's so special that an early 90's AFM? And it's not just on Nissans either, but lots of import cars?

cheers.

[lwells]

SS8_Gohan: Because the AFMs on RB25s run out of resolution quickly, and the Z32 AFMs are reasonably easy to source and work with the PFC and other engine management system (including stock I believe? Anyone confirm?).

LW.

[kc]

I know everything about the the standard RB26 can handle about 300rwkw, at which point the injectors max out in duty cycle (closely followed by the afms at about 335rwkws)

I'm planning on getting that 300rwkw, but in doing so I want a bit more head room, thus changing the injectors and afms will give me greater margin for the future when changing turbos.

[Bass Junky]

It's not really the cross setional area that is the problem, its that the Hot Wire sensor has been calibrated for a different volume of air, and hence when you suck more air through, they run out of resolution.

Isn't the cross sectional area of the Z32 the same as the RB25DET anyway?

BASS OUT