I am new to the dual cam scene and was wondering....I have a stock b18c and my vtec crossover can be heard at 6K rpm.Should'nt vtec operate at an earlier rpm? I spoke to a friend about it today and he says somethings wrong.All of my knowledge is with the sohc's where vtec can't even be heard at all.

 

my friends kicks in at 5200 rpms i would check your oil also when was the last time it was changed cause with haven vtec i would make sure it is every 3k at least and i would make sure you are using 5w30

 

I'm assuming you have a GSR b18c1 correct? If so, are you still using the stock intake manifold? which ecu are you running? If everything is stock, then what you're hearing is the IABS in the stock intake manifold (dual butterflies are opening up around 5700-6k RPM). On the stock p72 GSR ecu, vtec x over is set at 4400 rpm from factory. Hope this helps a little

 

yes b18c1,everything is bone stock

 

then the noise that you're hearing is the secondary butterflies opening up.....vtec is actually at 4400 rpm but you can't hear it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by iH8RICERZ &raquo;</TD></TR><TR><TD CLASS="quote">then the noise that you're hearing is the secondary butterflies opening up.....vtec is actually at 4400 rpm but you can't hear it.</TD></TR></TABLE>

This is such a common misconception, it should have it's own FAQ thread.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by thewrai6th &raquo;</TD></TR><TR><TD CLASS="quote">

This is such a common misconception, it should have it's own FAQ thread.</TD></TR></TABLE>

True

Funny thing is no matter what you will still get people come on here and swear on their mother that their stock gsr's vtec kicks in at 6k because thats what their ears tell them lol!