Hey guys, Its been a while since ive posted on this board... Used to be 95lsramair but that was recently totalled and I FINALLY got a '01 GSR... VTEC OWNS...

Anyway,
I figure that I can drop the crossover point for the secondary butterflies with an RPM switch and patch up the fuel curve with my VAFC II (not yet installed...) I dont like to slam hard all of the time, and 5300 rpm would be nice.
My butt dyno says their is a power increase exactly when they open, so maybe there is a lost power around 5k. Only dropping it a small amount wont kill the MPG at all. Yes, I know about skunk2, but im not rich.

Only problems could be ecu codes????? Irregular wiring to the solenoid?????

I searched for this and got a lot of good info, but I want to do it now. Has anyone been successful. Thanks.

 

I'm not sure about the RPM switch but if you install the VAFCII you will be able to control the VTEC cross-over point to the value you want. It also has a built in power band plotter so you can make a few runs down the street and see how the gains are. I don't think you need to put in the RPM Switch if you have a VAFCII.

Cheers

 

I plan on changing the vtec possibly also... but the switch im talking about making is for the secondary butterflies in the intake manifold.

 

There's a guy on team-integra.net, "kelly", who's done this before. I believe he used a Mallory switch. Go there and search for "IAB", "secondary", "secondaries", "butterfly", butterflies". Read the threads with a lot of replies.

 

UPDATE... Well, I bought the MSD rpm switch and an infinitely adjustable rpm pill and created a custom circuit for controlling the butterflies. The wiring in the helms manual was wrong indeed (as i read about in another forum), about how the IAB is controlled stock.

Some weird twists and odd ends during creation but it is completed and works perfectly. I set them at about 5k now but feels the same so far because the VAFC2 isnt in there yet to adjust the fuel curve change at a lower level.

Kinda fun to play around with now, but as soon as I drop in the ITR cams Ive got and set the VTEC and the butterflies at both around 5K (to engage at the same time ), that should make for a loud changeover.

If anyone is interested on specifics/schematics let me know, I could probably post a "how to".