Afm And Haltech E11v2 - Married Or Divorced?

[xiaorpowr]

Hi everyone, My question is about AFM's and whether it is required on my car or not. Sorry if this question is massively noobish

I have a R32 GTR running Haltech E11v2 ECU. It currently does not have an AFM fitted. I was told by the seller that Haltech does not support/require AFM's.

The following are reasons why I think I may need an AMF:

1.The idle is mostly around 1100 RPM on norm temp, sometimes fluctuates up and down the revs range between 1000 - 1300rpm. To me it sounds a bit unhealthy - kind of like a ported rotor having a heart attack - its bumpy but a irregular kind of bumpy! The seller said the idle is caused by aftermarket cams & cam gears.

2.On cold starts, the car will choke it self and die if I try to start it without throttle, I have to hold above 1500rpms for about 15-20 secs and then it will stay on without shutting down.

3. At the moment I would say the car is running super rich & using around 19L/100km 98 pump fuel (could just be the mapping?). This is driving normally (shifting around 3500 - 4000rpm) and running on low boost (7 psi). The car outputted 300kws at the wheels (not sure if thats 2 or 4) on 16psi, obviously I know that I will go though plenty petrol with that much power and I accept that. But on low boost thats a bit high ain't it?

Anyways, all these symptoms are described in the GTR service manual as possibly related to the AFM...

With all this said, my question is:

1. Can you run Haltech ECU with AFM? or SHOULD I run AFM's - is it necessary?

2. If yes, should I get 2 AFM's or is one AFM sufficient? read on the service manual that the car functions fine with just one!

Your expert opinions will be much appreciated!

[Mr. Untouchable]

Haltech = No air flow meters.

sounds like the car could do with a tune/check up.

[Aberax]

The Haltech E11v2 uses a Map Sensor, so no need for an AFM (My R33GTST is running a 3 Bar Map Sensor) - I still have an AFM in place to keep the engine bay looking stock-ish. By the sounds of things you need your cold start tune to be looked at, and having the rest of the tune looked over wouldn't go amiss.

I have a bit of rev hunting issues with my car, my tuner says its down to my Nismo 740cc injectors - too big for my application, and too hard to control down low in the rev range. As for fuel usage, sounds about right, i am using about 15l/100km with ~260rwkw @ 15psi.

Best option is to take it to a tuner, put it on the dyno with a wideband sensor and have the tune touched up, as i think with running a MAP tune they are more vulnerable to environment change then the AFM tune - I think i remember reading that somewhere.

[JonnoHR31]

if its setup properly your 740s should idle fine and unless your thrashing it all the time you can do better than 15L/100km. air intake temp correction takes care of environment changes and should be setup properly.

19L/100km is not "about right", thats terrible economy for street use. get it properly tuned

[xiaorpowr]

thanks everyone. tune it is then! not very happy with how the boost come on anyways... N1 turbs and boosting @ 5000rpm... super late and uber annoying!

should i ask for anything in particular?