AFM upgrade (Z32?)

[JimX]

What is the advantage of upgrading the AFM to a Z32 or other item? I realise that the diameter will be bigger and the restriction less, but is there any point if you don't upgrade the rest of your intake plumbing? What about the throttle body? That will probably be the hardest/most expensive thing to upgrade, is there a point in doing the AFM if you don't also do the TB?

How much roughly will it cost to get a Z32 AFM and hook it up to the turbo with the correct-sized plumbing?

[A31_Cefiro]

I don't think the actual diameter is any different. I believe the AFM off an RB20DEt is 80mm (not sure on RB25) which is the same as a Z32 AFM.

I think the difference is the amount of HP it can aupport? Maybe the Z32 is more accurate or capable at high HP levels...?

[JimX]

Ah ok, my misunderstanding then It's just that I've heard lots of people complain about the stock Skyline's AFM being quite restrictive, so I assumed the Z32's was bigger. I guess I was wrong.

[sidewaymambo]

Z32 has better resolution to provide higer vots according to the air intake then R 32/33, unless your AFM is max out, other wise only benifit minimal.....my 0.02

[T0nyGTSt]

Jim,

If you get a good price on the AFM, I'm interested. I doubt it is really necessary on <200kW motors but I'll do it for completeness.

They are unbelieveably expensive from Nissan dealers.

There area few threads on AFM's. Do a search.

T.

[ed]

yes...not a worthwhile mod unless your current AFM has maxed out. Also you need something like SAFC with the AFM or a PowerFC etc...as the stock one doesn't understand the resolution the Z32 gives (voltage range).

What mods have you done so far JimX?

phil, put that flap thingy in your exhaust yet?

[sidewaymambo]

yes, you need power-fc or after market ecu can adjust the AFM.. P-FC can support Z32 and Q45 from menu...Q45 is 90mm diameter.. for S-AFC you need to play it a bit..

ed..ya...have not put it on yet..just wait for another parts to arrive..

[JimX]

Ed, current mods are fmic, 3" cat back exhaust, some unidentified aftermarket Garrett turbo that's bigger than stock (previous owner said it was a T04 flowed to 450hp, but who knows?), EBC, and S-AFC. However I'm only getting 166rwkw at 12psi, and my mechanic is pretty sure the intercooler plumbing is the main item to blame. It's really shockingly bad, so I was going to look at upgrading the whole intake at some point. Also have to replace the dump pipe with a bigger one, hoping to crack 180rwke after these are done.

[ed]

JimX, 166 on 12psi is really shocking.

Any photo's of the FMIC piping?

Has it been on a dyno? Got AFR dyno chart?

You're better off doing Front + dump IMO.

180rwkw shouldn't be hard if you're gonna be running @ 12.

EDIT: you don't happen to know the A/R on your turbo do you?

[JimX]

Ed, dyno run done at Hills Motorsport in December. It was a hot day, so maybe that caused me to lose a little power It's quite strange, I can hardly tell the difference in power at .6 bar and .8 bar, but when I bump it up to 1 bar it's like I've opened the flood gates. I get wheelspin in 2nd at 1 bar so I'm starting to think I'll just leave it set there. It uses around an extra litre per 100km at 1 bar but who cares

No photos of IC piping, but it's got several sharp 90 degree bends (ie not even rounded) and seems to be of a smaller diameter to the intake and throttle body. Mark said it was atrocious and all things considered 166kw was quite good. I am going to get it redone along with the front/dump pipe for a total cost of around $700 (custom items for both at Hills). But I'm a poor bastard for now, this mod is a few months away at least.

I don't think I have the AFR chart, but I did see the readouts on the screen. Mark kept the AFR around mid to high 11's because he was worried about detonation and said that pushing it higher wasn't giving me much more power so he left it in the 11's.

I haven't had a good look at the turbo, but I do know it says Garrett in big letters on the housing.

[ed]

JimX, exactly WHAT are you getting done for $700? if it's just cooler piping....bejesus that's expensive :eek:

Perhaps your turbo needs big boost, might be oversized?

Have you done a compression check?

[JimX]

$400 for custom cooler plumbing (he said there would be about 5 mandrel bends) and $300 or so for custom dump pipe. Seems reasonable to me.

If you know someone that can do a good job on intercooler plumbing for less, let me know I don't know what brand the IC is, it measures about 600x300x60 I think.

Edit: haven't done compression check. Pretty much installing the S-AFC and tuning it are the only mods/tests I've done to it since getting it. Oh, and changed spark plugs

[ed]

hmmm...try going to exhaust shop and see how much they'd charge...shouldn't be too much as they'd copy existing piping except use bigger pipe and mandrel bends.

ie - they don't have to f*&k around measuring angles and sh1t.

[JimX]

Mark was going to put it over the top of the radiator instead of back through the air box like it is at present. But anyway, I'll shop around when I have some money in a few months.

[T0nyGTSt]

Jim,

You are looking at $300 for a z32 with wiring connects.

Maybe you're lucky and can get one closer to $200 from a wrecker.

I'm about to contact someone about it but it's wayyy down on my 'TO DO' list.

Also you need to get out more with your fellow Skyline owners

T.