For your interest

Red/Pink line - best run with standard Rev-up plenum.
Blue lines - best run with modified 287 lower plenum and AAM spacer.

Current engine mods:
HKS Legamax exhaust
HKS Mid-pipe (Y-pipe)
Modified 287 lower plenum (6mm off top of front runners)
MD ISO thermal gasket
Apexi safc II (My a/f is 12.5 flat at open throttle)

 

Impressive torque gain. Very.

 

Dleong,
I'm considering the Apexi SAFC. How was it to install and tune? Did you have many splices into the factory harness or did you use an Autosport adapter? Would appreciate any advice on this...would you change the Apexi for UTEC or Greddy, etc. if you had to do it over again?.
I don't expect to go FI any time soon but would like to take most advantage of my NA mod investment. I'm holding off on HF Cats install until decided.

Thanks

 

Yes my friend wants/needs this Apexi SAFC any details on this would be appreciated! Thats quite a bit of tq gain!

 

what and where can i get a autosport adaptor? the adaptor lets you hook up AFC with out splicing wires?

 

Autosport harness (adaptor) goes between factory ECU and car wiring so that your splicing into it and not the car...in case you want to return stock.

http://www.autosportwiring.com/

...it's not cheap...

 

Hi LMG 35C & GMZ,
I have been using the SAFC II for over 1yr. I wired it directly into the harness just behind the ECU (covered by the plastic cover.

Thought about going with the Autosport harness initally but decided it was not worth it.

I went with SAFC II because it was the most cost effective way the to adjust the fuel. I did not need to adjust the timing as the ECU does that by itself (I am staying N/A).

The SAFC II works perfectly and i can adjust the fuel curve on the dyno to whatever i like (currently A/F is 12.5 flat at open throttle).I can also adjust for partial throttle, etc.
I have tried numerous different setting (A/F of 13.1 produces 3 whp more) but have stayed with A/F of 12.5 since i track my car frequently.

I currently have the SAFC II setup for the extra fuel to start coming in at 50% and reaching my presets at 85%.

The car runs Perfect!

Hope this helps.

 

^^^ Thanks for your reply - glad to hear you have success with this unit - some saying that it's dangerous but I don't understand why.

Just another few questions if you don't mind.
When you say Dyno-tune - is that necessary or can you read and adjust A/F directly through the unit. I was also wondering if this can be tuned using someting like the Cipher (PC SW via OBD-II connector) with it's data-logging capability?

- I'll start reading through the Apexi install and operating manuals to see if this route makes sense for me but any advice you have is most appreciated.

Gotta love this addiction

 

Subscribing

 

Adjusting the fuel is done from the unit (low point, high point, % trim, etc).

I personally would not adjust anything that effects the A/F without a wide-band oxygen sensor and a dyno.

In my opinion, the oxygen sensor on the car (narrow-band) is not accurate enough and data logging on the road is very dangerous (Speed). It is also very difficult (if not impossible to get constant load across the rev range.

Honestly, why risk damaging your engine.
Do it properly.
This goes for any fuel or timing adjustments no matter what ECU your using.

 

^ - Thanks again - voice of reason makes me realize that there is only one way to do this right. If I go this path though, I may opt for the additional cost and benefit of something like the UTEC or Greddy EU.

 

Actually 2004.5 and newer Zs do have wide bands from the factory and they are very accurate.

You are right though, a dyno is the only safe way to tune for high loads, I don't recommend street tuning for anything other than drivability (low speed/transient conditions).
-Jared.

 

Solid Thread!

 

I've heard this as well.

 

so i suppose that the s-afc being rendered useless due to the fact that the car will always tune itself to a certain afr is no longer. This was around for a while where, people felt that eventually the car would see that it was running richer/leaner and adjust and this would basically over-ride the settings in the s-afc.

 

It will still learn around the offests when it is running in closed loop, but at WOT it shouldn't be in closed loop.
I'm not sure however when 350Zs switch from CL to OL and back.

 

!!!!!!!!!!!

Altered Atmosphere (AAM) is running a GB on their reflash over on the Fresh Alloy forum under the 350Z and G35 threads. Reflash seems to be only way to raise rev limiter and to positive adjust AFR & Timing without all the fine dyno tuning.

!!!!!!!!!!!!!!!!!!!!

 

$???

 

You need to PM the contact that's listed for the pricing but I think the more people that sign-up the better the deal. Price I received was a pretty good discount. Don't want to post the price as I also don't want to jeopardize the arrangement.