im running a po6 ecu on a d16z6 and i have a vafc2 laying around i was wondering if i could hook that up and have control the vtec insted of getting a p28 lmk need help thanks

 

I'm pretty certain you'll need to chip that P06 to activate the VTEC and then you can use the VAFC to adjust its crossover point.

But the P28 is probably a better solution.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SuzukaBlueAP2 &raquo;</TD></TR><TR><TD CLASS="quote">I'm pretty certain you'll need to chip that P06 to activate the VTEC and then you can use the VAFC to adjust its crossover point.

But the P28 is probably a better solution.</TD></TR></TABLE>

He hit the nail on the head. *EDITED cuz I was full of BS*

you should be able to source a P28 pretty cheap - I bought one at a junkyard last year for ~$30 then sold it on ebay for ~90


Modified by kalm_traveler at 9:25 PM 9/4/2008

 

a p28 is the same ecu as a p06 once its chipped dude.

Keep the **** you have and chip and tune it for your parts. A p28 will run WRONG also.

A vafc is just basically a adjustable rpm activated switch. The 12 volt vtec solinoid wire runs into it. the ecu sends 12 volts to it, the gadget does not allow that 12 v to pass to the sol untill the rpm is at the desired set point. Aint no trickin the ecu to it, its just an inturruption in the power supply based on what rpm signal its getting.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BLACKLIST138 &raquo;</TD></TR><TR><TD CLASS="quote">a p28 is the same ecu as a p06 once its chipped dude.

Keep the **** you have and chip and tune it for your parts. A p28 will run WRONG also.

A vafc is just basically a adjustable rpm activated switch. The 12 volt vtec solinoid wire runs into it. the ecu sends 12 volts to it, the gadget does not allow that 12 v to pass to the sol untill the rpm is at the desired set point. Aint no trickin the ecu to it, its just an inturruption in the power supply based on what rpm signal its getting.

</TD></TR></TABLE>

I see... sorry for my misinformation then - I'll edit the post.

I have a Q for ya though - if all it does is send the 12v to the solenoid early, how can the motor run? Or in other words, if VTEC from the factory engages say at 5500rpm and you use the VAFC to set it at 4900 how can it run if the ECU doesn't have VTEC maps for that low of RPM?

Or do the ECU's have full VTEC maps but just switch over at the pre-set RPM?

 

pretty sure its a pre set map. Just the switch itself is an rpm activated ordeal.

As far as how the ecu does it, most of the time im pretty sure you leave the vtec oil pressure switch wire cut and left aside when hooking up a vafc(maybe... cant remember exactly, some riceboy can call me out on it since i dont specalize in that junk). As far as the vafc, all its doing is changing the rpm activated voltage point.

The entire vtec system runs off 12 volts to that solinoid. The solinoid opens to allow the 7ps oil pressurei to flow into the pins that lock the vtec rocker in place at the desired rpm. Aint nothin more sophistocated about it. The correction rates and all that are what alter the tuning. The vtec portion is just a simple switch. Hell the spoon sports vtec controlers are just a rpm switch in the form of a **** that goes between that circuit.

As for your question, you can most def change it to change over at 4k rpm and not have your map fatten up for vtec till the factory point, thats why those things are garbage imo. Most consumers that get them think that you just move that **** around and it makes the same power just makes vtec kick in later. WRONG, if it was that simple you would have a bass **** for yo vtec from the factory.

If you are tuning the car, tune the vtec where you want it to cross over. There is NO REASON you need to have the ability to change the vtec ever again. There is no reason you even need that r2d2 gadget in there.

Personally id sell the vafc and have the car tuned. Its a **** POOR method for tuning. That and the first time some dumbass gets in your car and tinkers with it while you are in the store buiying smokes, your tune is [freak]ed.