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Apexi air fuel controller

 
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Old 04-17-2011, 11:51 AM
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Apexi air fuel controller

anyone else got one of these?
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Old 04-17-2011, 12:54 PM
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Re: Apexi air fuel controller

about a billion people across the world do, yes.




was that your question? or was there more to it???
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Old 04-17-2011, 01:27 PM
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Re: Apexi air fuel controller

i was just wondering what is the point of buying one? the guy that had my prelude before me bought one for it but i never see the point of using it
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Old 04-17-2011, 01:53 PM
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Re: Apexi air fuel controller

air/fuel control, better burn, more horsepower, smoother power ban...if its a VAFC and you have VTEC, then you also have VTEC control availability. Not as in depth programing as say Neptune or Hondata, but not a bad piggy-back controller.
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Old 04-17-2011, 02:50 PM
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Re: Apexi air fuel controller

ive always thought about getting one of these. anyone know how to install it with obd1 if thts even possible?
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Old 04-17-2011, 03:21 PM
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Re: Apexi air fuel controller

If you've got obd1 there's no reason to use a piggyback, just run hondata or Neptune
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Old 06-18-2011, 03:53 PM
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Re: Apexi air fuel controller

What if you have odb2..2000 lude, what are the effects of neg n pos value on a vafc2 for wide and narrow throttle.
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Old 06-19-2011, 12:07 AM
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Re: Apexi air fuel controller

Piggy back controllers (VAFC, SAFC, VAFCII, SAFCII, Neo etc etc) are helpful on OBDI and OBDII to tune your engine after boltons (Intake, header and exhaust).

The MAP sensor only allows removal of signal (negative values on the controller) under wide open throttle (WOT) (a side effect is advancing of ignition timing). Adding MAP under WOT will lead to some serious hesitation as the maps in the ECU don't account for positive pressures (ie increasing MAP signal beyond like 2.9volts means the ECU has no position in the fuel maps to check, and thus it goes crazy). You can however add or remove MAP at low-mid throttle, not that I can see why you would want to do that because the oxygen sensor counters it anyhow.

I tune my H22 with an SAFCII, Wideband gauge and fuel pressure regulator. Not as effective as Hondata, Crome etc but costs a fraction of the price plus I can run the stock P13 ECU. Simply set timing to stock (OBDI only), increase fuel pressure and datalog the wideband signal under WOT. Then remove MAP signal and watch the air fuel ratio improve (13.1-13.3 works well for me). The SAFCII provides a signal from your knock sensor too, which is handy for tuning. I use both the low and high throttle maps on the SAFCII and it also has two data files, one of which I have set up for day time (removing more MAP on the high throttle map) and one of which I have set up for night time (removing less MAP due to colder air, my air fuel ratio leans out at night so I need to reduce the amount of MAP that I remove). Can't complain about the tuning, works really well. Can data log the wide band (AEM UEGO) and do say 2nd gear sprints and record them my laptop to see how my air fuel ratio is across the board.
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Old 06-20-2011, 12:14 PM
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Re: Apexi air fuel controller

Thanks milano..was wondering what it all did since I don't have Tue wideband sensor yet, should be putting one on when I'm doing my timing belt this weekend :\
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