I want this thread to be more of a discussion on previous experiences and factual info please:

I got my VAFC about 6 months ago and installed and tuned it on the dyno myself with the help of explinations from RT and BrandonB and was able to gain quite a bit of power throughout the powerband. Although I never changed my VTEC engadgement setting and always left it at 5800 and 6000. Well a few days ago I decided to tinker with the car and set the VTEC Engadgement for 5500RPM's. I noticed that it seemed to go though the the 500 RPM's between 5500 and 6000 way faster than it should have but it was to short of a distance to tell so I set the VTEC engadgement for 4000 just to see what would happen. After playing with the VTEC match/unmatch settings I got the car to run great at the VTEC engadgement at 4000 and did not experience the hesitation before VTEC like so many others have explained. So now that it is running right (At least as far as I can tell) at a 4000 VTEC engadgement the question is whether or not there is any performace gain between a stock s2k and the one with the 4000 engadement.

Now the reason I hadn't played with the VTEC transition before is because everyone always told me that the stock settings were the ones that netted the most power. But these same people also told me that there car ran like crap and that there was hesitation when they did this...I do not experience this hesitation and wonder if perhaps the people that tested this did not play with the VTEC Match and Unmatch settings and therefore didn't have there car running optimally and that is why they thought they were loosing power when setting the engadgement that low...

I will be dyno'ing my car next Friday again to do some more extensive testing a tuning with my VAFC and was going to do some plots of different VTEC engadgement points...but wanted to first gather as much information as possible on people who have previously done this and the results you found. Also does anyone know of any adverse effects this may have on your engine by having VTEC set at a low number such as 4000...

Currently with no dyno results I will not to begin to say the car feels stronger or weaker because that is just going by my butt meter but I will say one thing that surprised me the most...(and this is also the reason I am putting so much time into this project)...is how fast it reved from 4000 to 6000...it's like the 2000RPM didn't even exist.... This is hard to explain but you hear VTEC kick in at 4000 and by the time you have to look at the dash to see 4000RPM's it's already at 6000RPM's. Like I said it's hard to explain but the past day driving the car has been a blast! Instead of my having to launch to 6000RPM's to get a good launch I just leave the line like normal letting the clutch out at 2500RPMs and hammer it and instantly I'm in VTEC... My friend and I did some quick test to see how much faster it was and to make sure it wasn't us...every time we tested the launch between the two the 4000RPM VTEC ET was anywhere from .3-.4 a second faster than the stock settings in 1st gear...that's a huge difference...now obviously this will only be noticed in first gear because after that you don't see less than 6k again but it has made my car much more driveable. Has anyone else noticed this...does anyone else know why this happens...?

Sorry this post was so lengthy but I wanted to provide as much info as possible.

 

Negative points? Two words:

Fuel Economy.

Blake

 

I've also heard that if it's set too low your VTEC solenoid will, what, go bad (?), blow up (?)...whatever they do.

 

Obviously! But what would be important to know is how much...if were talking less than 20 miles a tank I could care less...but I would assume it might suck a little more down than that. Also...this is easily gotten around...you can change the setting in 3 seconds back to stock. This would be usefull if we find that decreasing the VTEC this low helps in the drag strip...! I'm not going to begin to speculate as to what this would do on a road course! Anyone else have anything to add?

 

Interesting...this would definitly be bad! Who told you this? Can anyone explain why this would make the solenoid go bad? If it's true I wonder how we could find out how low is too low.

 

Tech at JE Honda knew a guy who did it.

There was also a certain individual on this board that lowered his VTEC all the way down to ~3,500...dyno'd, and never posted the results. He ended up taking the unit off of his car. Maybe he'll poke his head in here.

 

[QUOTE]Originally posted by Wesmaster
[B]Tech at JE Honda knew a guy who did it.

There was also a certain individual on this board that lowered his VTEC all the way down to ~3,500...dyno'd, and never posted the results.

 

I just got my V-AFC in, but haven't dyno tuned it yet. I wanted to play with the vtec point a little, but what exactly is the unmatch points mean? Can somebody explain?

Nick

 

Just FYI,

Spoon lowered their ECU VTEC engagement point to 5100rpms. From A&J racing website.

 

you know whats funny about when you dyno your car using the VAFC and your ass, is that at times you think you car is alot faster. But wait till you go on the dyno. youll be caught off guard.

The butt-o-meter in my opinion is very deceiving.