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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

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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.

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.

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.

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

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