I bought my 95 SR-V (Vtec) prelude with the vacf 2 installed by the previous owner. Weirdly enough, my fuel milage is somewhat crappy but the car itself runs very well. It passed emissions, tires are aligned, i cleaned the air filter, new spark plugs etc. Im thinking its the vafc settings related to fuel mixture. I read the manual but its confusing...anyone know how to reset the settings on there, if any, to stock?

 

either under settings or the 3rd menu ( i think its options or etc.) thre is an option called initialize, this will set everything back to 0. but before doing this try and dry out the car by a point or two using the vafc so you'll get better mileage.

btw from what i know drying out car (leaning it out) gives more power and saves more gas just dont lean it too much cuz ull mess up your engine. My 5th gen is leaned about -7 to -8 points (cant remember right now) on high rpm and about -1 or -2 on low rpm and is giving me more power than stock and is using less gas.

anyone feel like contradicting me go right ahead, you might just know something i dont know, no insults please.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Pussy_magnet_00 &raquo;</TD></TR><TR><TD CLASS="quote">either under settings or the 3rd menu ( i think its options or etc.) thre is an option called initialize, this will set everything back to 0. but before doing this try and dry out the car by a point or two using the vafc so you'll get better mileage.

btw from what i know drying out car (leaning it out) gives more power and saves more gas just dont lean it too much cuz ull mess up your engine. My 5th gen is leaned about -7 to -8 points (cant remember right now) on high rpm and about -1 or -2 on low rpm and is giving me more power than stock and is using less gas.

anyone feel like contradicting me go right ahead, you might just know something i dont know, no insults please.</TD></TR></TABLE>

initializing the VAFC sets everything back to default which means you need to know how to set it up as well.

Your concept is correct, but a vafc doesnt "really" control the fuel, by itself. It modifies manifold absolute pressure voltage to make the ecu think a different amount of air is entering through the throttle body, thus changing the amount of fuel given.

I would suggest never messing with it unless you know what its doing, how to operate it, and have a wideband to make the changes needed.

Leaning out the high cam will gain power with the stock h22 ecu considering they DO run rich from the factory at WOT.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98vtec &raquo;</TD></TR><TR><TD CLASS="quote">

initializing the VAFC sets everything back to default which means you need to know how to set it up as well.

Your concept is correct, but a vafc doesnt "really" control the fuel, by itself. It modifies manifold absolute pressure voltage to make the ecu think a different amount of air is entering through the throttle body, thus changing the amount of fuel given.

I would suggest never messing with it unless you know what its doing, how to operate it, and have a wideband to make the changes needed.

Leaning out the high cam will gain power with the stock h22 ecu considering they DO run rich from the factory at WOT.</TD></TR></TABLE>


thats pretty much what i want, i didnt install it, and dont intend on using it and resetting it will be easier than ripping it out. this my daily driver, not a track car, the vafc is useless to me

 

ur not understanding what i am saying.....it doesnt come setup to run on our cars. If you initialize it, you have to setup the vtec crossover, and you have to setup the vafc so it knows what kinda of engine it is operating on.

to make it to where the vafc is making no changes, just set all the maps back to zero and set the vtec crossover to 5200 from lo-hi and 4800 hi-lo

and unless they altered map timing by alot, this thing wont hurt your gas mileage.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dicorp &raquo;</TD></TR><TR><TD CLASS="quote">thats pretty much what i want, i didnt install it, and dont intend on using it and resetting it will be easier than ripping it out. this my daily driver, not a track car, the vafc is useless to me</TD></TR></TABLE>
Then have a shop close to you take it out. its not that hard if it has a harness, unless the hot wired it. but still wont be that much and youll be on stock ecu and you gas miles will come back. And if you have no need for tha vafc......

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98vtec &raquo;</TD></TR><TR><TD CLASS="quote">ur not understanding what i am saying.....it doesnt come setup to run on our cars. If you initialize it, you have to setup the vtec crossover, and you have to setup the vafc so it knows what kinda of engine it is operating on.

to make it to where the vafc is making no changes, just set all the maps back to zero and set the vtec crossover to 5200 from lo-hi and 4800 hi-lo

and unless they altered map timing by alot, this thing wont hurt your gas mileage.</TD></TR></TABLE>

i reset it using the initilize option and didnt have to set up anything....interestingly enough, the rpms are shown correctly now, as opposed to being off by 150-200. isnt vtec supposed to kick in at 5000?

 

I just thinned out the NARROW throttle a little more. Going to see if that helps my MPG a little. I went from 25 to 21 with the change of season pretty quickly.

 

btw check the setting for the narrow and wide for throttle position make sure its something like 30-35 narrow and 55+ wide so you definately dont get it running wide without wanting to.