I was surfing around and found a Buddy Club V-Con Vtec controller so you can change when your vtec comes in, and I was wondering if changing the crossover point to a little later, would that help the gas mileage It sounds in theory like it could, or it could just be me?

Oh here is a link to the website:
Buddy Club V-Con VTEC Controllers - JHPUSA.COM Serving JDM Since 1999

 

I have an apexi neo and it don't change gas mileage lol I have vtec actually off and theres no difference

 

On a car like this,I see no point in changing the VTEC engagement. At 109hp, I dont see how raising VTEC about 2800rpms would do anything...

 

^^ But on a well modded Fit it might be useful, maybe not to increase MPG, but overall power.

 

are you kidding me? modd or not there is a diff. having 500rpms compared to lets say 2000rpms of vtec is a huge diff.

 

You do understand that on our cars, the minute your foot does more than rest on the gas pedal, VTEC engages...It doesnt just kick in at 5400rpm like in a regular VTEC equipted car (we have more of an e-VTEC). I have just about every power adder mod known to man on my Fit, not including FI, and I dont think adding a VTEC controller would do anything...

Besides, even Hondata has already stated that Fits are tuned in the best way possible from the factory. This is why they are not making reflashes for the Fit. (unless you're boosted)

 

Thanks, for the responces, for some reason in my head it looked like it would have worked. I guess it was like wishful thinking lol.

 

I jus cant seem to agree sorry...

 

Cant seem to agree with what?

 

agree that a vtec controller would do nothing... theres a reason they make them.. put vtec lower. power faster. instead of waiting for it to kick.

 

You know they also make electric powered superchargers for a reason...

I am sure there are applications on high powered VTEC engines where adjusting the crossover point might help somehow. But on a 109hp Honda Fit, I see no reason why anyone should want to change the crossover.

I cant speak for everyone, but every time I ever met anyone with a Honda where the VTEC was changed it was alot slower. When I had my 2004 Sentra SE-R spec V I raced a fully bolted 1999 Civic SI. When it was set normally it was pretty close, but every time he tried to lower when the VTEC kicked in, I pulled really hard on him.

Im no genius or anything, but I bet the engineers who designed VTECs engagement rpm knew what they were doing.

 

understandable... i felt a difference. im getting it hooked back up this week and going to the track this weekend... ill share the times with you to see if there is a difference? then we'll see from there??

 

cool... best of luck!

 

Hey!
My brother got a vtec controller for his EK 1.6vti
Basically, he thought he could set it to 3000 for more performance, as opposed to the standard 6000
When the VTEC kicked at 3000, there was no power, you could just hear a slight change in tone - but no extra power. Only around 5000ish did the VTEC itself actually start pulling.
So now he has it set to 5,500, which is the optimum performance point on a car that isn't turboed.

500rpm does actually make a difference in performance though; it does take quite a bit of time to reach 6000 rpm from 0.

Best of luck with your VTEC controller George - let us know the times, I'm quite interested

 

Yeah thats what most people I heard had problems with...VTEC just isnt meant to engage that low, without FI or NOS. something to help pull the car along.

I just need to find someone whos using a fuel controller on their Fit...so I can get my NOS running right.

 

To set your vtec at the most efficient and best performance you need to run it on a dyno. Run it once without vtec engaging at all. Then once with vtec engaging at or below idle. Take those two dyno graphs and put them together and where your horsepower lines cross is where you need to set your vtec engagement. Set it and leave it until you have changed something else. I believe that a Fit with only I/H/E will not need to change the vtec engagement. That's just my opinion. It wouldn't be worth the $$.

 

this might b true? i had mine set at 4800 rpms not too low at all and it would pull... but the reason why I got my fuel controller is bcuz i plan on running nitrous

 

What about a VTEC switch? Is that possible? Could you set it up so that with the switch on VTEC would operate as it does from the factory but with the switch off VTEC would not engage at all?

I think a setup like that would be helpful for fuel economy when running at high speed on the freeway. You could turn VTEC off and then go above 65MPH or wherever the engagement is without going into VTEC territory.

I guess the only question is if there is a single wire that you could install that switch on that wouldn't freak out the ECU and cause CEL and stuff.

 

I personally tried getting vtec controller installed but couldnt, the car is so new that wiring diagrams are hard to come by. mine threw check engine lights all the time, so I pulled it, and now jus waiting for updates, save your money