I have a 97 gsr and it seems like my vtec kicks in way to early. at what rpm should it come on? right now mine is kickin in at 4500rpm and that seems way to early.

 

what ecu? stock intake mani? that sounds right for a p72 with the stock intake mani, the iab's(secondary butterflies) open at 5600rpm but actual vtec should "kick in" at 4400-4500rpm on a stock gsr with a p72 ecu.

 

yeah its the stock p72-a03 wow my chipped p28 I had set to kick in at 5500rpm but that was with a b20/vtec setup it had a b16 head on it. but thanks it just seems like its so early but I am running a blox intake si I dont have the 2nd butterflys any more.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mike1jag &raquo;</TD></TR><TR><TD CLASS="quote">yeah its the stock p72-a03 wow my chipped p28 I had set to kick in at 5500rpm but that was with a b20/vtec setup it had a b16 head on it. but thanks it just seems like its so early but I am running a blox intake si I dont have the 2nd butterflys any more.</TD></TR></TABLE>

WHAT?!?!?! A chipped ECU that has a different vtec setting? Ya right

 

Normal. The torque curve of a B18C1 falls off right about 4000rpm, so the Honda engineers set VTEC at about 4400-4600rpm. B16s continue to make torque until about 5000rpm, which is why it's VTEC point was set higher in the rpms.

 

now I am going to go obd1 wich ecu would be better a p28 or a p72? and with the intake and stuff that I have what should I set the vtec at? I am also lookin at a set of itr cams.