I have a '99 Prelude, and the vtec engages at 5200 rpm, but how much of a difference will a vtec controler make even if i'd set it at 3000.

 

not much without any other mods.

 

I also have headers, exhaust, intake, and a mugen ecu

 

Having the engine hit vtec that low would be pointless. The whole reason for vtec is to have different camshaft lobe profiles to ensure the engine is getting the proper amount of air. When vtec hits the valves open more than if not in vtec, so having it hit at 3000 you wouldn't feel it as much as if it were in the upper rpm ranges, where it is far more usefull. Most people I know set there's at 4500-5000 rpm. An apxi vtec controller is for more than tuning the vtec engagement point, its got an intergrated throttle map (cool for speed runs!), redline control, adjusting rich/lean fuel mixture and a bunch of other cool (and sometimes useless) features.

 

with the Apex VAFC i dont think you can set the VTEC under 4500....there is no point in using a vtec controller unless you have a few mods including head work or block.

 

how do you have a mugen ecu? and if you did, why would you want to lower VTEC and mess up the af and powerband?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Kal &raquo;</TD></TR><TR><TD CLASS="quote">how do you have a mugen ecu? and if you did, why would you want to lower VTEC and mess up the af and powerband?</TD></TR></TABLE>

i don't know about mugen ecu's,
but you can lower vtec to smooth out your powerband
and get a little more midrange power

 

to my knowledge, mugen ecu's already lower VTEC lol (that is if he really does have one).

 

mugen ecu doesn't lower vtec, they raise the redline

 

i don't mean to sway off topic but is it tru that stock h22's don't make much power beyond 7200 rpm's anyway?

 

That's where the normal redline is, mine is 7800

 

My dyno shows that my stock SH makes it's peak hp of 155 at 7000rpm, and then at the 7700 rev limit it is still making 145hp.