i have a b16 running wit a reprogrammed p28 vtec crossover is 5900-6kRPM. I also have a vafc and set vtec at 5k. When it hits vtec at 5k it doesnt feel normal like power is bein held back then around 6k it pulls harder but from 5k to 6k it feels restricted. Like the title says it doesnt engage smoothly. However when i set vtec at 6k it doesnt do this. Anyone know why and if setting it at 5k is actually hurting performance because vtec isnt smooth? Need some help thanks

 

are you still getting a power jump ,if so u cant be slower, also i think some engines have 2 stage VTEC im a H-guy so i only know 1 stage!

 

hmm yea i still get a jump but i was wondering if setting it back to 6k where it engages smoothly, if that would be better then setting it 5k and having it not engage smoothly. Anyone else have info for me

 

any cel's?

seems normal to me

 

Nope no cels

 

what i would do is go buy a new fuel filter, if not recently replace, and injector cleaner.

 

why would you do that, what could that possibly do.

Leave your vtec a little higher. Opening it too early hurts performance just like a car with a big cam barely idles. The vtec lobes are too much for lower rpm's.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by WuRKD b16 &raquo;</TD></TR><TR><TD CLASS="quote">i have a b16 running wit a reprogrammed p28 vtec crossover is 5900-6kRPM. I also have a vafc and set vtec at 5k. When it hits vtec at 5k it doesnt feel normal like power is bein held back then around 6k it pulls harder but from 5k to 6k it feels restricted. Like the title says it doesnt engage smoothly. However when i set vtec at 6k it doesnt do this. Anyone know why and if setting it at 5k is actually hurting performance because vtec isnt smooth? Need some help thanks</TD></TR></TABLE>
if your motor is stock, leave the crossover at the stock 5500rpm crossover. your engine is getting too much cam too soon. honda put it at 5500rpm for a reason.


if you want to experiment (just to feel the difference)...set vtec at 4000, and then at 7000...see which is a bigger difference (HUGE extreme..just for testing)

mike

 

i have crower st 2 cams, full crower valvetrain, 3 angle valve job, slightly ported, milled head, ctr pistons.

 

mess around with "the tec" see if that helps..

mike

 

Go to a dyno! To many variables. I bet u dont have chit

 

if you change the solenoids engagment you have to compensate for the extra fuel and air correction needed which you can do with your vafc, with out setting the vafc's maps you want get any more power, basicaly all you did was switch from the primary lobes to the secondary lobes which are v tec your ecu want advance or retard the timing or compensate the fuel.

 

thanks

 

you need to go to a dyno

do not **** around with a VAFC's vtec engagment espically if you have no idea what you are doing.

 

I ran similar set up on my stock bottom end b16 with crower stage 2 cams and i had to run vtec ingagement at 5900 rpm cause anything less it would lose power and anything more it would do the same.

 

Well, with the larger cams you'd probably want/need a higher VTEC activation point