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Who's Using An Apexi Safc In There R32 Gts-t?

sidewazegtst
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sidewazegtst Collaborator

sidewazegtst

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Posted

Hi guys whats up.

I was just wondering who here is using the Apexi SAFC in there R32 GTS-t's? It does'nt matter if it's version 1 or 2 as I just wanted to know what the +/- fuel correction would be for GTR 444cc injector's? I know the stock GTS injector's are 270cc so to have the GTR injector's behave like GTS injector's whats the number I need to imput in the Low/Hi throttle maps across my NE points?

In my old kade engine from my 240, the stock injector's were 270's as well and when I installed SR 370's the correction (untill a dyno tune) was -27 across the board. That let me drive the car at least untill going to the dyno. True it ran a little lean but I did'nt go boost crazy so it was'nt an issue. In fact I did my best to stay out of boost.

As well if you maybe post up what your current number's for it are, along with the set up, that will give me a rough starting point at the dyno. I may not be going with an Eprom tune for a little while but I'd like to turn the boost up to around 10psi ish and have the injector's, walboro pump, fpr and SAFC for fuel controll untill then.

Any other experiences you've had using the SAFC on an RB20det motor would be appreciated too.

Thanks a lot fella's.

Cheers B)

ellie Proficient

ellie

Posted
Posted

I'd be guessing heaps of people do but i'd try a search in forced inductionor post in that section as i'm sure you would recieve more replies from the more technical than general section

Hope that helps :)

esprit Proficient

esprit

Posted
Posted

Just a quick question, what benefits would be had if I installed an older series 1 S-AFC in my R32 (rb20det) ? Will it allow me to lean out the fuel mixtures and make the car use less fuel? I think my car is running quite rich. Who tunes SAFC's, is it done on the dyno by the guys there?

Thanks

Roy Grand Master

Roy

Posted
Posted

The SAFC cheats the signal from teh AFM to the ECU to change the fuelling of the car. It doesnt actuall control the injectrs directly. So i t could be very tricky tryin gto use an SAFC to control bigger injectors...if you need bigger injectors it may be worhwhile saving for an ECU or gettign it re-written by an expert.?!?!?!

esprit Proficient

esprit

Posted
Posted

/start Hi-jack

I'm running a relatively stock setup, apart from 3" turbo back exhaust, pod filter, hks ssqv bov, stock turbo running on boost-t at ~10psi. I think my car is using more fuel than it should and running rich.

Will an SAFC be able to make it use less fuel and get a better a/f ratio? Thats all I want to know :)

/end Hi-jack

sidewazegtst Collaborator

sidewazegtst

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Posted (edited)

Well there's no real point in using an SAFC if your running stock injector's. The ecu will compensate for the extra boost and hopefully supply enough fuel. You really only need an SAFC when running a different maf or injector's.

The best way to determine your a/f's is either with a wideband or the dyno. I don't think you'd be running that rich and if so, it's probabley only on the decel when you let off the throttle. That's no big deal though.

Now to fully answer your question, yes the SAFC can either increase or decrease the amount of fuel even with stock injector's however you can achieve pretty much the same result using a rising rate fuel pressure regulator. However if you have an SAFC already and want to put it in, your fuel corrections will start at 0% +/- and go up or down from there. The 0 is because you have stock injector's and you'll just play around from there. I'd recommend leaving it at 0 across the board in Low Throttle for sure. Your High Throttle %'s will have to be determined by a wideband or dyno. Oh also remember to gap your spark plugs to .8 mm's to get rid of the spark out issue in the high rpm's when you turn the boost up.

Well I hope that answers your question ok. :rofl:

Now can anyone answer my question about the proper correction needed to make GTR 444cc injector's act like the stock GTS 270's? I just need the number's so I can at least drive to dyno.

Edited by sidewazegtst

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