90hbvtec

on a 95 gsr motor b18c when does vtec hits..can you hear it on a stock motor or does the motor needs to be mildy mod so u can hear it kick in..?..

numbnuts22715

i think it hits at like 4400, then secondaries open up at like 5k or something..
You should be able to hear the secondaries.. But you may not hear it hit at 4400.

dc2vu

4400 = vtec crossover
6000 = secondaries <---someone correct me if im wrong

pat.ter.rick

get an exhaust and you'll hear it...

pat.ter.rick

secondarie kicks in around 5k

2G0S0R1

5k...6k...?

You are all mistaken... Secondaries(Intake Air Bypass) are opened at exactly 5750 rpm.

And to answer the creator's question. Most people can hear vtec kick at 4400, but it isnt very noticeable without an intake or an exhaust. The IAB is much more noticeable.

phateless

4400? really? i have a short-ram on my car and i can't hear **** until about 5800 rpm...

ElementMotor

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by phateless &raquo;</TD></TR><TR><TD CLASS="quote">4400? really? i have a short-ram on my car and i can't hear **** until about 5800 rpm...</TD></TR></TABLE>

me too, I can really hear it right around 5800 as well...

Sifu

Despite what every says about hearing it better when you have an intake or exhaust I can hardly hear it on mine Unless I really concentrate that is

axi0m

I hear mine at around 4800, then again my car is loud as ***** running an open exhaust. So yea.

99exd16y8

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by phateless &raquo;</TD></TR><TR><TD CLASS="quote">4400? really? i have a short-ram on my car and i can't hear **** until about 5800 rpm...</TD></TR></TABLE>

that noise isnt vtec, that noise is the butterflies opening.

honda1982

Mine open at 4800rpm. Get a V-AFC and mix it up a little. Oh yeah turbocharge it first, V-AFC are nothing unless you have Force Induction or a good built N/A.

UnlimitedHonda5

isant it like primary...then secondary.... then the butterflies.... and then vtec lobe oh well dohc vtec engines are a ''mystery'' lmao

2G0S0R1

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by UnlimitedHonda5 &raquo;</TD></TR><TR><TD CLASS="quote">isant it like primary...then secondary.... then the butterflies.... and then vtec lobe oh well dohc vtec engines are a ''mystery'' lmao </TD></TR></TABLE>

No.. Its not a mystery at all, here is how it works for a stock b18c1...

idle-4399rpm: the car is running on the two small lobes of each camshaft...

4400-5750rpm: the vtec solenoid opens allowing oil pressure to travel through the rocker shafts, then through the rocker arms... forcing the two lower arms to pin together in to one solid block that includes the vtec(middle/bigger) arm on the camshafts... this has a distinct sound (tick-bwwwaaahhhhhh)

5750-redline: The ecu cuts the ground circuit to the solenoid that keeps vaccum suction holding the Intake Air Bypass valves closed, causing them to open... allowing a shorter path for the air from the throttle body to the head.

Fairly simple if you have an advanced mind... but also simple to any mind with the ability to learn.

One thing that I have never researched though... when you hit redline and the ecu "cuts the fuel" for short intervals, is it pausing the injector pulses... or is it holding back the spark and not actually cutting fuel (lean?)...

Post it up whoever knows!!! Thanks!

90hbvtec

thanks guys..know i got an idea when it hits..

dc2vu

good clearin that up 2G0S0R1