VTEC sound on non-VTEC motor

[esskater892]

so as im driving and i put my foot into it. is it normal for our cars to feel like vtec at 4k. i dont have vtec but ill be driving it and even putting my foot half into it once it kits 4k its like theres a small vtec feeling. is this normal or not?

[JoshM]

If you have an a6, it's probably the IABs.

[deevergote]

The IABs open around then. If you have an A6 (which is the stock motor for all SE models), that is what you are experiencing.

You could also have your ignition timing advanced, which would put the powerband in a higher RPM range than it should be.

[Kboers]

powerband? when the car begins to make the most power

[deevergote]

The powerband is the engine's most usable range of power production.

[stunin92_accord]

reply

wow solid! im lucky i found me my f22a6..

[deevergote]

What the hell is that supposed to mean?

[wed3k]

at around 4k, i usually just step on the pedal harder to give the same effect.

[deevergote]

I haven't driven my car in forever... so VTEC kicks in whenever I stop humming "mmmmmmm" and start yelling "BAAAAAAAAAAHHHHHH" while sitting in the driver's seat.

[Melgottaexcoupe]

If you have an a6, it's probably the IABs.

wut exactly are IABs and wut does it do......sorta new to this...also i have an a6

[JoshM]

wut exactly are IABs and wut does it do......sorta new to this...also i have an a6

Intake air bypass, the "secondary intake runners".

It keeps the 4 valves in the intake manifold sealed shut. When those valves are closed, only the primary runners are flowing. Once you are in the high revs, the box releases the vaccum and the spring loaded valves open up so that you have secondary intake runners, which allow you to flow a higher volume of air at high RPM.

... or something like that.

[Eddie93fourdoor]

yes i remember this same vtec sound from my couzins EX a6 but i believe he had ported and polished the head and intake manifold. I must say i love the sound when he steps on it

[youngflyndsaved]

Intake air bypass, the "secondary intake runners".

It keeps the 4 valves in the intake manifold sealed shut. When those valves are closed, only the primary runners are flowing. Once you are in the high revs, the box releases the vaccum and the spring loaded valves open up so that you have secondary intake runners, which allow you to flow a higher volume of air at high RPM.

... or something like that.

thanks for the info on IABs.. i was curious what they were since i'm always hearing ppl talk about a similar function to vtec.

so the f22a6 motors are the only f series with the IAB function? and the h22 motors have it as well am i right?

[deevergote]

H22 and H23 motors have it, and I'm sure the later model F series have it as well. The F22A6 is the only engine among the 3 USDM CB motors that has it.

It's not really similar to VTEC, other than the fact that it flows a greater volume of air at a higher RPM. VTEC adjusts the actual cam profile, and has a much greater impact. The IAB system is nice, though.

[CB7Nub]

IAB's are great and that's what your feeling, it's just more air I believe that goes more directly into the combustion chamber. I believe that's it.