Jump to content
SAU Community

Nismo AFM vs Z32 AFM

kc

By kc,
in General Automotive Discussion

 Share

Recommended Posts

kc Enthusiast

kc

Posted
Posted

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

Link to comment
https://www.sau.com.au/forums/topic/44686-nismo-afm-vs-z32-afm/
Share on other sites
meshmesh Mentor

meshmesh

Posted
Posted

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.

SS8_Gohan Grand Master

SS8_Gohan

Posted
Posted

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.

kc Enthusiast

kc

Posted
  • Author
Posted

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 Grand Master

Bass Junky

Posted
Posted

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

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • Murray_Calavera
      R33 GTR running -9 with no tune

      By Murray_Calavera · Posted

      I don't understand how this hasn't boiled down to - Upgrade the turbo when you have everything required. ECU, injectors, fuel pump, turbo, etc. Do it all at once.  If you don't have everything required, just enjoy the car as it is and keep saving up your pennies. 
    • Duncan
      R33 GTR running -9 with no tune

      By Duncan · Posted

      Sounds like you've got an interesting adventure ahead here with local support if you have trouble! My guess is that, unboosted, you will be OK with a small upgrade like -9. What will happen is that once the stock ECU sees more airflow than it expects it will add a heap of fuel and pull a heap of timing to be safe because it can't understand how it could get that much air without there being an issue. You will see clouds of black smoke and it won't pull hard through the midrange and top end. So, overall it will be a bit frustrating but should be OK. If you are still nervous set the base timing back 2o through the CAS, but it will be even more sluggish everywhere. As said above through...this is not my guarantee your engine won't be blown into a million pieces, leaving you looking for very hard to find parts A better idea is get a computer with logging ASAP, wire in a wide band O2 sensor and a use remote tuner. I've done multiple cars this way and while it is not as good as a specific tune on a dyno they can get it 90% right. I'd suggest if you can afford an R33 GTR these days you can afford an ECU and tune. And if you can't afford that you sure won't be able to afford the rebuild if it goes bad in the meantime,.  
    • Duncan
      New kid on the block

      By Duncan · Posted

      Yeah it would be nice if someone took the time to put that sort of information together, but there are a lot of variations in looms. I think you are making this way hard for yourself if you just want to get it running....sourcing an SR20 with the right wiring will be a billion times easier than matching the RB loom to an S15 chassis. If you do end up going this way, you just need to trace every wire in the loom with a multimeter, 95% of them will go to a location you can confirm at the ECU.....and then post it up for the next person who needs it  
    • Duncan
      Coolant leak?

      By Duncan · Posted

      Just top it up with water, and keep a general idea of how much you added. It is normal for water to be pushed into and pulled out of the reservoir through the cap, and it should not be more than half full or it will be likely to overflow when hot. Any decent mechanic can do a pressure test of the cooling system to confirm if you have a leak. Keep in mind if it is only leaking a little and when hot it may well evaporate before you see it hit the ground
    • GTSBoy
      Coolant leak?

      By GTSBoy · Posted

      I'd ask the shop what they used and use that. Mixing coolants is sometimes OK, sometimes not, and you have know the details of each coolant to know whether it's a good idea or not.
×
×
  • Create New...