I currently have it set at 4100...It was running fine at 4500 i believe, then we put it at 4100 and it started acting stupid...What could it be?...Im running Hondata s200 and im using a b16 head with a b17 bottom...The head is mostly stock...Could it be that there is not enough oil pressure since im boosting?...It does it almost all the time except on the occasion...It doesnt do it as much if I have the car off for a while then take it for a spin...Please any info will help...

 

I don't know your entire setup but your VTEC is way too low.

mike

try putting it back at 5500 and see what happens. i wouldn't mess with it much unless you are on a dyno.

 

under most circumstances, vtec is best around 5000-5500.

besides a few setups, honda sets vtec around 5500 for a reason.

here is proof of this...

a look at my stock b16a with 3 different ecu's.

source: http://www.hondaswap.com/~pills/chet_ecu.html



stock p30 makes most power (it made 152 on previous run) and has best power curve. as always, honda knows what they are doing, look at the curve!

 

while vtec could have been lowered 200-300 rpm to maybe get slightly more power out of the midrange, 5500 is the vtec point most likely because of the rpm's/mph associated with the y21 transmission. under normal circumstances, fuel economy is best preserved when not in vtec and on the highway anything under 80mph with stock diameter wheels/tires is below vtec. with vtec around 5000, highway speeds need to stay below 75mph etc.

of course these are all estimates, but i'm guessing honda does this all for the reasons i just listed.

 

chet, while i do believe your statements are probably correct..i dont think VTEC engagement on the highway was a real concern for honda because you have to be accelerating a fair amount for it to engage.

mike

 

Thanks for your responses fellas...Anyone Else?

 

Your VTEC point should be 5300 with b16a or GSR cams. Put it there, problem solved.

When you get larger cams, start it at like 5600-5800. Toda B's start it out at like 6600.

Jeff

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ImportReview &raquo;</TD></TR><TR><TD CLASS="quote">Your VTEC point should be 5300 with b16a or GSR cams. Put it there, problem solved.

When you get larger cams, start it at like 5600-5800. Toda B's start it out at like 6600.

Jeff</TD></TR></TABLE>

 

yes, at least past 5250rpm
you have a B17, try 5300-5600rpm

 

there is no way you can generalize where a VTEC crossover should be...



mine was best at 4500 rpm on my b16, ctr intake cam +2, itr exhaust cam -2
i made a pass with it at 5000 and 4500.. notice the gain with it at a lower rpm .. it's anoother 3-5 whp through the entire power band. the red is with VTEC at 5000 and the blue is with it at 4500.