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Old 07-08-13, 10:11 AM   #1
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Default vafc on gs400 will it work

I bought a vafc and wondering if it will work for my gs400 for my intake I installed to add more fuel
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Old 07-08-13, 11:47 AM   #2
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I'm curious too, but I've been reading the factory ecu will try to fight back any adjustments you made.
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Old 07-08-13, 03:44 PM   #3
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It will work. I installed the Apexi Neo afc in my GS400 about 5 years ago. It still works and I did a few dyno runs and re-tunes and the tuning stayed. Note that only the WOT tune stays, part throttle tuning gets replaced by the ECUs logic. My tuner only WOT tuned my car because of this. Good luck.
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Old 07-08-13, 04:23 PM   #4
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So gains only on wot? Daily driving its stock?
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Old 07-10-13, 05:04 PM   #5
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Yes, gains on dyno are seen at WOT. Daily driving is fine, I daily drive my car. FYI, you will see around 20whp and 20wtq gains.
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Old 07-10-13, 07:17 PM   #6
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Why would you want to add fuel? Power is made in the leaner a/f mixtures (lean is mean) and it will not work with the multiplex ecu as it will learn around whatever settings you try so it's a lost cause.

Also v in vafc is for v-tec so more for a honda.

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Old 07-11-13, 04:02 PM   #7
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It is a damn tuner! You add fuel at some rpm points and take away fuel at other rpm points. No one said to just add fuel to make more power. I am proof that it works and the tune is sticking. I have one of the fastest normally aspirated 2nd Gen GS' on this forum.
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Old 07-11-13, 07:46 PM   #8
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It is a inaccurate way to do so 1st off as tune by tps is a ticking time bomb but on an n/a car it can most likely work well as they are more forgiving in the event of an error but on a boosted car it is going to melt some internals even if your tps starts to go as that is what relies on for correction points.

If you have a 98-02.5 car then it would "work" as I think the multiplex came in to the picture in late 01.
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Old 07-12-13, 02:18 PM   #9
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Quote:
Originally Posted by xspsi6 View Post
Why would you want to add fuel? Power is made in the leaner a/f mixtures (lean is mean) and it will not work with the multiplex ecu as it will learn around whatever settings you try so it's a lost cause.

Also v in vafc is for v-tec so more for a honda.
I thought that V stands for Variable because that's what it does is varies the air/fuel mixture?
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Old 07-12-13, 10:23 PM   #10
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http://www.apexi-usa.com/manuals/ele...fc2_wiring.pdf
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Old 07-12-13, 11:44 PM   #11
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ah got it!
sorry I must have been thinking about gas turbine applications
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Old 07-13-13, 05:56 AM   #12
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It can still work you just can't use the "v" function
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