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Z32 Afm Alternative Help Plz!

Turbz RB-25

By Turbz RB-25,
in Engines & Forced Induction

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Turbz RB-25 Experienced

Turbz RB-25

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Posted

Hi Fellas,

My R33 GTST will be tuned soon, I got an RB30 bottom end put on it with a GT3540 0.82

My mechanic is aiming somewhere around 370rwkw mark, however, I do remember somewhere that the Z32 AFM maxes out at like 320 rwkw?

Is this correct?

If so, and it does max out, does this mean I will have to purchase a new ECU and sell my PFC? Or is there a more powerful AFM on the market?

Cheers.

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Turbz RB-25 Experienced

Turbz RB-25

Posted
  • Author
Posted
This one maxes out at 500PS (368kW) - http://www.nengun.com/tomei/air-flow-meter-z32

Is that at the engine or at the rear wheels?

Also, is a VH45 AFM bigger and better than the z32? What does that max out at?

I believe the Z32 nengun is selling is the same as the one I got, it's just that Tomei sell them, they are still a genuine nissan part.

Thanks

daisu Mentor

daisu

Posted
Posted (edited)

Alternatively if you split the inlet to 2 pipes, fit an AFM on both pipes, the air flow through each flow meter will be half, so effectively each one would only need to be rated to half the power output (370/2 = 185kw) Effectively you could get away with 2 RB20/25 AFM which are relatively cheap in comparision.

Since the PFC is now only seeing half the airflow you will have to half the injector sizing to keep your AFR the same.

VH45 AFM would be the easier option

Edited by daisu
2LV8ETR Mentor

2LV8ETR

Posted
Posted
Alternatively if you split the inlet to 2 pipes, fit an AFM on both pipes, the air flow through each flow meter will be half, so effectively each one would only need to be rated to half the power output (370/2 = 185kw) Effectively you could get away with 2 RB20/25 AFM which are relatively cheap in comparision.

Values in rwkW:

RB26 single - 149 / twin - 299 / 65mm diameter

RB20/25 single - 226 / twin - 453 / 80mm

Z32 single - 255 / twin - 453 / 80mm

Q45 single - 302 / twin - 605 / 90mm

Turbz RB-25 Experienced

Turbz RB-25

Posted
  • Author
Posted
Values in rwkW:

RB26 single - 149 / twin - 299 / 65mm diameter

RB20/25 single - 226 / twin - 453 / 80mm

Z32 single - 255 / twin - 453 / 80mm

Q45 single - 302 / twin - 605 / 90mm

Well I knwo for a fact that's incorrect, when I had my GT2835 Pro S setup, I was making close to 280rwkw and the Z32 was no where near maxing out....

Are your sources credible, where are you obtaining this information from???

SLAPS Rising Star

SLAPS

Posted
Posted (edited)

Mine was doing 5v at 302rwkw and prior 4.8v at 270rwkw. 444 injectors maxed at 250-260rwkw and needed fuel pressure to get to 300rwkw.

320rwkw with 5.1v. :D

That nengun link - Tomie is just a Z32, 500ps/hp is 'little' over 300rwkw.

I've also seen a Q45 max out earlier than the Z32; not sure what was up with that.

Same dyno the std rb20/25 afm was maxed a little over 180rwkw.

I'm moving away from afm. Looking in to the ViPec 'possibly' there still appears to be a few little niggly's with them though.

Even if the afm is max'd you can still bodgily tune it. The problem is there needs to be a little head room so on those cool nights it doesn't lean out or det.

Edited by TheRogue
W0rp3D Grand Master

W0rp3D

Posted
Posted (edited)
Even if the afm is max'd you can still bodgily tune it. The problem is there needs to be a little head room so on those cool nights it doesn't lean out or det.

I am currently running my standard afm at 110%, tuner does not like it though.

Another option that i have seen is to put the guts of the z32 into a 4" pipe, therefore you will have more volume at the a certain flow.

Edited by W0rp3D
180or200 Proficient

180or200

Posted
Posted
I know of 2 25's making 330 plus at 4.9 volts with z32's, I've also tried a q45 that maxed at much less power!

forgot to mention they were both running e85, most likely getting a bigger bang for each gulp! it's so tuner friendly it wouldnt matter if the afm maxed out.

Cjmartz2k Proficient

Cjmartz2k

Posted
Posted
I am currently running my standard afm at 110%, tuner does not like it though.

Another option that i have seen is to put the guts of the z32 into a 4" pipe, therefore you will have more volume at the a certain flow.

I did that and don't really like it. I would at the very least put it in 3.5" pipe instead of 4". It's tough to get to idle correctly, and it's real twitchy at part throttle stuff. We tacked a 2.5" length of intercooler pipe inside the 4" intake pipe around the hot wire and it seemed to help some, but it's still more trouble than it's worth. If you don't want to go MAP, I would look at Ford Lightening MAF's. They also make upgraded MAF's for Lightenings that are supposed to have digital processors and something like 4 or 8 hot wires with a big X in the middle to cut down on turbulence that are good to over 800rwhp that idle like a dream. I'm trying to find them now. Anywho, they are 0-5v hot wire sensors and retail for somewhere around $300 USD IIRC.

Tektrader69 Rising Star

Tektrader69

Posted
Posted
Values in rwkW:

RB26 single - 149 / twin - 299 / 65mm diameter

RB20/25 single - 226 / twin - 453 / 80mm

Z32 single - 255 / twin - 453 / 80mm

Q45 single - 302 / twin - 605 / 90mm

This is not right. There are quite a few Z32's with 320RKW + that still use a Single MAF

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