I have a Nissan Sentra just to get that out of the way.

I am installing an SAFC Neo in my car, and want to get the vtec controller to work.
My VIAS (vtec) activates from the ECM grounding the wire.

I've been searching on Alldata all day to figure out how a Honda's vtec is controlled.

Anybody help me with this? and please no flaming...

All I need to know is how it's activated... 1 post, 1 answer...

 

Alittle hamster named vtec pushes a pin over to make the valves open more.Then gets tired and pushes the pin back when you are off the gas

 

The ECU gives power to the VTEC solenoid. The solenoid is self-grounded thru it's mounting plate. I'm not sure whether it's battery voltage or regulated 5v or something else...

This is strange considering Honda's traditional method is to have battery voltage always & switching the ground side of the circuits.

 

Alright... so I guess the AFC Neo work work for my car because it was designed for VTEC motors... If the ECM grounded the vtec, it would work, but ya... damn oh well.

 

Has to have proper oil pressure as well.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JimBlake &raquo;</TD></TR><TR><TD CLASS="quote">This is strange considering Honda's traditional method is to have battery voltage always & switching the ground side of the circuits.
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That would require 2 wires instead of 1 for the current setup.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Evil_Twin &raquo;</TD></TR><TR><TD CLASS="quote">Alright... so I guess the AFC Neo won't work for my car because it was designed for VTEC motors... If the ECM grounded the vtec, it would work, but ya... damn oh well.</TD></TR></TABLE>

You can always wire up a relay so when you give it power, it will ground your output.

 

That is true, I just wish that the Neo could do it all... Damn Nissans.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TurboC53_4g63T &raquo;</TD></TR><TR><TD CLASS="quote">Alittle hamster named vtec pushes a pin over to make the valves open more.Then gets tired and pushes the pin back when you are off the gas</TD></TR></TABLE> I have had a few beers and this was so funny to me.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 02 accord &raquo;</TD></TR><TR><TD CLASS="quote">That would require 2 wires instead of 1 for the current setup.
</TD></TR></TABLE>
That's what I mean. Honda's traditional method switches the ground side of the circuit; they do that on all the other solenoids on the car. The VTEC solenoid is different from Honda's traditional method.

 

hahaha....hampster

 

vtec uses oil pressure to engage. your oil pump is run off the crank shaft so when your rpms go up it spins the oil pump faster which makes more pressure . when the oil pressure hits a certin psi a solenoid opens allowing oil through tiny passage ways which slide pins that lock in a different cam follower so the valve is controlled by a tottaly different cam lobe which increases valve lift and duration.depending on the motor you have sohc or doch depends if vtec will change intake or exhaust valves or both. in a non vtec motor there is a set valve timing which if youve ever seen a dyno power curve graph you see the horsepower rise, peak then drop off but with vtech the power curve will rise peak drop off a lil then vtec kicks in and it will rise and peak again wich is great for power in high rpms and also better fuel mileage hope that was imformative enugh for for u