Disable the VTEC Solenoid Valve

Does anyone have any experience energizing the VTEC solenoid valve so that the engine is in full time 4 valve mode ?

So this question was asked last year, but no one answered. Seemed like a great question:

http://www.vfrdiscus...__1#entry678750



Looks like you can apply 12V to the solenoid, and it will enable 4 valves all the time.


1) Will this confuse the computer? I don't think so, it seems like its a one way street on this circuit.

2) Will it run like crap below 6800 RPM? No other 4 vavle bike seems to have an issue. Doesn't run that great anyway WITH the VTEC!

3) Will a PCIII or PC5 compensate for the extra valves? Does it need to?

4) AND... has anyone tried this???




Derek

There was a discussion (can't use search function myself, but you can google it).
The outcome was that the low speed responce will be crap - It is better with two valves.
And unlike other 4-valve bikes, this engine/intake/fueling, etc... has been designed for 2 valves low and 4 high.
Also, since you have an 06 (right?) your VTEC should not be an issue at all.

Why would you want to disable it?

There was a discussion (can't use search function myself, but you can google it).
The outcome was that the low speed responce will be crap - It is better with two valves.
And unlike other 4-valve bikes, this engine/intake/fueling, etc... has been designed for 2 valves low and 4 high.
Also, since you have an 06 (right?) your VTEC should not be an issue at all.

Why would you want to disable it?

Well, the bike is stock. And I can feel a pronounced jerk when it kicks in, usually in a turn. I decided to enter turns over 7000 RPM at the moment to avoid it. Why do you say that 06+ is not an issue?

Thanks!

Derek

Would be easier to buy a Gen 5 ... Just saying. But from a more theoretical point of view, interesting question.
C

02 through 05 the VTEC engagement was at about 6800 RPM and it was quite pronounced on some bikes (not on all).
Beginning in 06, Honda lowered the engagement point to around 6200 (IIRC) and smoothed out the engagement through fueling changes.

I've owned (still do actually) an 02 and an 06.
On 02 the VTEC was a biatch (for me sometimes). Why sometimes? Well, b/c sometimes it'd be perfectly smooth and sometimes it would chirp the rear wheel.
After several years of trying to find the cause of the difference, my non-scientific method has lead me to humidity. As soon as humidity raises, the VTEC starts kicking like a donkey. Don't ask me why - This is just a personal observation.

My 06, while MUCH smoother than 02, still lets VTEC come through a bit more in high humidity. None of it bothers me, because I have something to compare to. It is nowhere near as pronounced as it was on 02.

You've just started to ride this bike yesterday, I presume. It is the humidest (if there is such a word) time of the year. Wait until the humidity goes down and you'll be surprised at how smooth it becomes.

If you start disabling stuff, you will create more problems than you were trying to solve IMHO.
My advise is to save time and money and give the new bike some time to grow on you.

With a Power Commander you can adjust the fueling to smooth out the engagement point. I have an 03 and am using a map downloaded from this website. Works very well.

02 through 05 the VTEC engagement was at about 6800 RPM and it was quite pronounced on some bikes (not on all).
Beginning in 06, Honda lowered the engagement point to around 6200 (IIRC) and smoothed out the engagement through fueling changes.

I've owned (still do actually) an 02 and an 06.
On 02 the VTEC was a biatch (for me sometimes). Why sometimes? Well, b/c sometimes it'd be perfectly smooth and sometimes it would chirp the rear wheel.
After several years of trying to find the cause of the difference, my non-scientific method has lead me to humidity. As soon as humidity raises, the VTEC starts kicking like a donkey. Don't ask me why - This is just a personal observation.

My 06, while MUCH smoother than 02, still lets VTEC come through a bit more in high humidity. None of it bothers me, because I have something to compare to. It is nowhere near as pronounced as it was on 02.

You've just started to ride this bike yesterday, I presume. It is the humidest (if there is such a word) time of the year. Wait until the humidity goes down and you'll be surprised at how smooth it becomes.

If you start disabling stuff, you will create more problems than you were trying to solve IMHO.
My advise is to save time and money and give the new bike some time to grow on you.

Ah, you mentioned chirping, and that is exactly what happened. I was in a turn and the rear wheel chirped when VTEC kicked in. I wondered how can this be good? And yes, it is about 2345% humidiity right now. I didn't even want to ride it, but I figured I should since I just bought it!

So maybe the fueling could be toned down a bit at that engagement point. I was thinking about getting rid of VTEC to see how it rode. Seems simple enough, but I am sure someone must have tried this already, and I'd hate to find out after the fact that doing this mode destroys something, after its too late...

Agreed - I've had it a few hours and may be pulling triggers too early, but its in my blood... can't help it!


Derek

With a Power Commander you can adjust the fueling to smooth out the engagement point. I have an 03 and am using a map downloaded from this website. Works very well.

Yes, I figured this might be the case. But I haven't read this to be a 'magic bullet'.


What I don't understand is, there are countless bikes out there using 4 valves all the time and run fine. I agree that the extra swirl produced by only two valves probably helps a little bit in the low end, but the trade off is not worth it. That is - assuming disabling VTEC doesn't make the bike somehow run horribly due to the ECU.


Derek

Get some jumper wires, do it and report back.