i recenly purchased a 98 prelude type SH. it has an apexi vafc controller installed in it and i am trying to figure this thing out. anyone have knowledge of any settings or do i need to take it to a local tuner shop and have them tune it? it was bouncing from 1.5 rpm to 2k rpm but i managed to change he sensor numbers and now have it running at a flat 1k. but i am lost when it comes to changing the wide open throttle and narrow throttle or what settings are best. it is an older version of he vafc so i am having a hard time finding a manual on it.

thank you for any help you can provide.

 

It's not a good idea to attempt to tune it without a wide band O2 sensor. Best thing to do is look at the ECU and hopefully the previous owner shelled out the extra money for a plug and play adapter harness. If he did use a P&P harness just unplug the VAFC till you can get a dyno tune. A lot of people on here might give it a , but might as well use it since it was free and already installed. Worst case scenario if its hardwired to the ECU I wouldn't recommend running it too hard till you can at least get someone experienced with it to check all your settings. As far as I/H/E, the VAFC in going to work fine.


Modified by no1knows908 at 1:48 AM 2/25/2008

 

for any series mods the VAFC is not a very good option. I'm not exactly sure what the options for SHs are these days, I believe the greddy Emanage is one though, which would be much better than the VAFC

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Speedra500 &raquo;</TD></TR><TR><TD CLASS="quote">for any series mods the VAFC is not a very good option. I'm not exactly sure what the options for SHs are these days, I believe the greddy Emanage is one though, which would be much better than the VAFC</TD></TR></TABLE> What if you have to need to tune the car on the spot? do you wanna carry a lap top around?

 

Thank you for the advice, i will have to check out the ECU and see if there is an adapter and unplug it. If not i guess i will will run around taking it easy until i can get to the tuner shop.

Since i am not running turbo do i still need a wide band AF guage or will a normal AF gauge work??


Modified by xxervio at 4:44 PM 2/25/2008

 

if your engine is not heavily modified, and you don't have a wideband to tune, leave all the fuel settings at "0"

here is the instruction manual


http://www.apexi-usa.com/pdfInstallation/48.pdf

 

if you have idle problems with all fuel settings at 0, you have a problem elsewhere, do NOT try to fix it with the afc..
check this link: https://honda-tech.com/zerothread?id=1979500