Hello all. I was wondering if any of you have ever thought about wiring a "human" controlled VTEC solenoid circuit? A switch where you could enable VTEC through all RPM ranges or relay it back to computer control. Isn't an engine basically an air pump? The more air you put in the more power you get out. If you have more air coming in (with the correct air/fuel ratio) then that gives more power. 4 valves are better then 2 right? Any benefits for racing applications as well?

Just Wondering...

-= S2KUSMC =-

 

no

 

I'm not really sure what the question is, but are you asking if you can make a manual switch to activate VTEC? Then yes you can (though I don't see how it would be very useful)

If you intend to leave "VTEC on all the time" then Toda makes cams called "VTEC Killers" where the the normal and vtec lobes are the same size.

Either way, whatever you're talking about sounds like it would require a lot of tuning.

 

i dont think you understand how vtec works

 

 

here's a quick breakdown.

ever seen those v8 muscle cars that lump at idle and stall at stop signs? well our vtec cam is big enough to do that to us if we used it under 3000 or so rpm's. .. hence the reason we have vtec. to get the best of both worlds.

out motor has an economy lobe that keeps the midrange in check untill it runs out of breath around 5500-6000, at which point, the high lobes take over.

 

If you where to put a toggle switch on the VTEC solenoid, the PCM would immediately go into back-up mode (3000RPM rev limit) as soon as the solenoid engages at the wrong RPM/load/throttle position.

The PCM switches the VTEC when it supposed to. Leave it alone. Switching the VTEC on at low RPM loses power.

 

What I meant to say was 2 valves are better than 1.

From what I understood in Gasoline Engines class, VTEC is a cam that takes over for the "economy" cam. The first intake port is used for economy. 1 intake and 2 exhaust. When the VTEC cam is active, it enables the second intake valve so now you have 2 intake valves and 2 exhaust valves running. thus the power side of the engine. I also think it advances timing slightly while also depressing the intake valves further then the normal 3000-4500 rev range for better air flow.

Maybe I do misunderstand VTEC.

If both intake ports are used full time then couldn't the VTEC cam just be used in place of the normal cam giving you the illusion of VTEC full time. Like I said before. More air, more power.

-= S2KUSMC =-

 

that sounds alot like what the i-vtec does in one of the honda's. .i forgot which one, i read up on it in sport compact car.

ours isn't like that.