Need Advise About Afm..

[nissan200sx.dk]

Hi.

Am building up a 1000hk rb 30engine.. (3.4 liter when spool gets his stroker kit ready)

800hk on boost for track days, and 150 - 200hk nos ontop of that when quartermile.

I use apexi FC commander, (AFM model)

Question is what do I do with my AFM so it wont be maxed out? (I have a z32 AFM)

I have 3 things in mind.

1. Either buy one more z32 AFM, use a apexi SAFC neo to splice the two signals to one.

2. Use my current z32 together with Y pipe.

3. Or mount my z32 sensor in a 4" pipe.

Th car is a daily driver, so i need low stable rpms. Which option of the above 3, do you guys think is the best solution? Number 3, if that will support it, is what I am hoping for... Number 1 and 2 take up alot more space in a already compact 200sx - s13 engine bay...

Thank you.

[doo doo]

Um, methinks you won't find any afm that will support that power by itself, twin Z32's might but right at the end of their resolution. (changing size of pipe doesn't work) If you really want that result with tuneability and driveability then very simply get a Motec or Autronic computer to run it (they run map sensors so no afm's needed) For what it costs to do that sort of build and have it reliable the extra cost of the best aftermarket ECU you can get really is immaterial (you can factor in selling the pfc). Just get the one for which you have the best access to tuning support with. (And i'd be guessing Motec). Have a chat to whoever you're going to use to tune the car and get their opinion too.

[Adriano]

Why do you say changing the pipe size doesn't work? Worked perfectly for me last week.

[Adriano]

I dont think a z32 sensor in a 4inch pipe will flow enough. Im using an rb26 sensor in a 110mm internal diameter pipe, and should max around 500-550rwkw. The issue i can see is whether it will have the resolution to let the thing idle.

[EFI Performance]

3. Or mount my z32 sensor in a 4" pipe.

You hit the nail on the head.

What we have done/modified.

Any Question's let us know.

Edited December 18, 2008 by EFI Performance

[paulr33]

my choice

twin z32s, the Y pipe to give you two AFM inputs into the compressor cover

and use an apexi safc II to give you a bridge into 1 AFM input on the main PFC

if you max a pair of twin z32s you can use the SAFC to bend and trim the signal

much the same you can do the PFC to bend and trim the signal to give you more scope

you can even invent your own AFM ramp in the PFC if you have datalogit (i assume your tuner will)

[Adriano]

My only issue with twin z32's is the cost. Using a normal sensor in the bigger pipe, you can bridge and have two plugs on the AFM, which means there is no wiring modifications, then you adjust the AFM curve using datalogit as you say(or nistune as i have done)

[nissan200sx.dk]

AFM are mounted on pressure side.

A z32 in a 4" pipe, how much power will that be able to cope with?

The place it takes up is very important, as there isnt much to give.

But looks like the two AFM are the best solution?

[Adriano]

If you measure the internal diameter of the Z32 housing, i can tell you what it will max out in a 100mm internal diameter pipe.

[Adriano]

Actually just remembered its 70.8mm, therefore in a 100mm internal dia pipe it will max out around 550rwkw

[toffy]

sell your current pfc and buy a d-jetro version

[nissan200sx.dk]

I prefer AFM over MAP anyday... So would rather find a solution with AFM.

Look like I will need to use 2 x z32 AFM together with SAFC..

The new NEO version of the SAFC, can that still combine the two AFM signals as the older SAFC-II?

[nissan200sx.dk]

Bump

[Richieb]

I have heard tales of re-calibration of AFM's, maybe another way forward.