i was told this about vtec crossover points please correct if wrong

b18c1...4,400rpm
b16a....5,600rpm
b18c5..5,800rpm
h22a...5,200rpm

what is the reason for the certain cross over points for diff motors, esp the c1 motor?

 

c1 does not vtec that low

 

i dunno thats what ive headr froma few peeps

 

some has to do with the following:
a) gearing of the car with mind for daily dirving
b) to provide best of powerband, like different cams on itr from gsr lead to different vtec crossover

when tuned with different setups (n/a or boosted) may lead to different crossorver points.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SleepnCiViC &raquo;</TD></TR><TR><TD CLASS="quote">i dunno thats what ive headr froma few peeps</TD></TR></TABLE>

Doesn't always mean its right

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by py1188 &raquo;</TD></TR><TR><TD CLASS="quote">

Doesn't always mean its right</TD></TR></TABLE>

never said it was right, jus what i heard and i stated in my first post "please correct me if wrong"

 

Don't take it the wrong way. Not trying to be a dick, just saying how quickly misinformation can be spread.

 

no harm intended!

 

uhh.... b18c1 vtec x-over IS 4400rpm. The secondaries hit 5600rpm.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jdmspoonitr &raquo;</TD></TR><TR><TD CLASS="quote">c1 does not vtec that low</TD></TR></TABLE>

yes it does.

 

so then does the boost and the sound on the c1 not really come til 5600 or is it noticable at 4400

 

which motors vtec you think kicks in the hardest i cna only speak for the b16 and c5 motors.

b16 was weak and i only really noticed big diff in sound, power seemed minimal, my c5 motor vtec kicks iin very hard w/ big change in sound

 

the boost? is there a turbo I wasn't aware of hidden somewhere?

sorry. I think it pulls noticeably harder. It gets more noticeably louder at 5600, I guess. I've never cared that much about what exact rpm my engine gets louder, but a lot of people seem to.

If you look at a B18C1 dyno there is not as much of a noticeable spike in the graph at VTEC crossover as there is on a B18C5 plot.

 

B18C1 = 4400 rpm end of story.

F20C - 6000 rpm

*B18C5 - 5700

Every motor is different and has an idea crossover due to many factors.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B2FiNiTY &raquo;</TD></TR><TR><TD CLASS="quote">B18C1 = 4400 rpm end of story.

F20C - 6000 rpm

*B18C5 - 5700

Every motor is different and has an idea crossover due to many factors.

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

Exactly... So many factors play into when designed VTEC to come in... Compression, rod stroke, bore, camshaft design, intake manifold, etc. etc... That's why VTEC engagment varies per motor...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SleepnCiViC &raquo;</TD></TR><TR><TD CLASS="quote">which motors vtec you think kicks in the hardest i cna only speak for the b16 and c5 motors.

b16 was weak and i only really noticed big diff in sound, power seemed minimal, my c5 motor vtec kicks iin very hard w/ big change in sound</TD></TR></TABLE>

I like my car to have only audible VTEC crossover.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SleepnCiViC &raquo;</TD></TR><TR><TD CLASS="quote">so then does the boost and the sound on the c1 not really come til 5600 or is it noticable at 4400</TD></TR></TABLE>boost? u probably mean engage. the first vtec crossover at 4400 is basiclaly nothing. u wont feel it until the secondaries kick in.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B2FiNiTY &raquo;</TD></TR><TR><TD CLASS="quote">B18C1 = 4400 rpm end of story.

F20C - 6000 rpm

*B18C5 - 5700

Every motor is different and has an idea crossover due to many factors.</TD></TR></TABLE>
Although I thought c5 was at 5600...oh well 100 rpms is no biggie

 

aside from the S2k or NSX, the most noticeable vtec i've felt stock was from a 97 prelude

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Sukebei Oni &raquo;</TD></TR><TR><TD CLASS="quote">aside from the S2k or NSX, the most noticeable vtec i've felt stock was from a 97 prelude</TD></TR></TABLE>

agreed.

Like night and day, which is odd on a *bigger* displacement motor.

 

I never been in a NSX but the prelude has the biggest "kick" aka dip.

 

Although I've used my hondata s200 to modify it, my car likes it's 6,000 x-over.

 

it doesn't even matter, because alot of people switch Vtec x-overs with Hondata or VAFC.

I have a b18c1 that hits vtec at 5800rpm.

 

aight im sorry i dont know where u guys have ever learned about this stuff but integra the gsr which comes with the b18c1 cracks vtec at 5,600 the secondarys open at 4,400 u realy dont even need some 1 to tell u that.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sirintegra &raquo;</TD></TR><TR><TD CLASS="quote">aight im sorry i dont know where u guys have ever learned about this stuff but integra the gsr which comes with the b18c1 cracks vtec at 5,600 the secondarys open at 4,400 u realy dont even need some 1 to tell u that. </TD></TR></TABLE>

one of the greatest first post I've seen. I give you my stupid newbie award.