Do I Really Need A Z32 Afm?

[dmr]

hey guys,

my car (R32 RB20DET) is about to get tuned (remap) and i'm still in doubt that i really need to upgrade to a Z32 air flow meter before i go ahead with it.

i'm aiming between 220-240rwkw with a TR43, injectors and the other usual mods. this will be at high boost levels. the RB20/RB25-s1 and the Z32 air flow meters are both 80mm. the only difference is the higher calibration.

my mechanics drift car has a reliable 260rwkw at the wheels on an RB25 with a standard series 1 (same as the RB20DET) air flow meter. it cops a beating all day on the track and has been fine since.

i have heard 2 main analogies:

1: the only difference between a standard sized afm and a Z32 afm is that the Z32 can be tuned in a finer and progressing manner higher in the rev/boost range.

2: the standard afm's max out at certain airflow levels and a Z32 is needed.

does anyone have proof (not heresay) that i actually need a Z32 afm to chase up to 250rwkw?

don't reply if you don't know from experience or theory, i'm after technical responses.

i would really appreciate opinions/responses from tuners.

cheers,

dave.

Edited July 9, 2008 by dmr

[85URK]

a friend of mine had an R33 gtst stock internals, pfc, avcr, hks cooler, hks turbo, bigger injectors etc, it made 360+hp with stock afm. so depending on your power goals, i reckon u can keep it. just a good tune. i dont have any techinical advice, just giving what i have seen. i would also like to know the HP flow capabilites of the standard afm on RB20/25's?

Edited July 9, 2008 by 85URK

[R31Nismoid]

Anyone can tune 'past' the AFM limit.

The Z32 just has a higher resolution, allowing for more airflow past it before its limit.

Every car is different. Wether you will or wont need an AFM @ that power level is debatable, and you wont know till you get there.

So you can either start spending tuning $$$ to find out its going to max, or bite the bullet and do it first. Either way it can go there

[rad100]

mine maxed on 190rwkw!!

like they said every car is different

[bubba]

I maxed mine at 183rwkw on my 30. It was hitting max voltage about 6000rpm.

[nizmonut]

any one tried wiring and plumbing up two afm's in paralell?

[nuclear_skyline]

mine maxed in my 25 quite quickly, but we clamped the signal in the EMU and richened the mixture using the injectors after that...

[Richieb]

"any one tried wiring and plumbing up two afm's in paralell?"... !!

Not gonna work, no chance. Could cause untold damage to 5v power feed from ecu 'nd all sorts od wierd happenings..!!

[RaZ_TuRbO]

mine maxed at 193 rwkw..i would change it.

[CEF11E]

I have an Rb30det that maxes out the afm at 190 rwkw. but the car makes around 260rwkw. it can be done.

my previous setup was an RB20 making 240rwkw and it maxed out the afm too.

you can do it and it will max out the afm,

there are a few things you need to consider.

1. will the car be used in a colder climate than when the tune is done?

2. are you planning to drift it?

if your max target is 220rwkw and full boost is made after 4500rpm then it will be fine. otherwise go for a z32. it will not increase total power but it will make your tune safer.

cheers