is it possible to adjust vtec engagement?

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Originally Posted by czy_sol87

thats what im tryin to say
u would never lower ur vtec point would u

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You would alter the cam change point if you altered the air/fuel ratios and ignition timing for your mods and 98 octane petrol. Usually you are then able to use highcam at a lower rpm without losing power from stock. That's what the hondata reflash does.

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Originally Posted by aaronng

You would alter the cam change point if you altered the air/fuel ratios and ignition timing for your mods and 98 octane petrol. Usually you are then able to use highcam at a lower rpm without losing power from stock. That's what the hondata reflash does.

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that's not really when you would change it... changing the a/f or igntion timing isn't going to make much difference there.

You're going to change vtec engagement when you alter the flow characteristics of the motor significantly. Forced induction, high comp n/a set up, different cams, etc. Pretty serious modifications are required.

also, if u change the timing, u will mess up torque numbers throughout ur revs

VTEC engines are known to have the flatted torque curves

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Originally Posted by saxman

that's not really when you would change it... changing the a/f or igntion timing isn't going to make much difference there.

You're going to change vtec engagement when you alter the flow characteristics of the motor significantly. Forced induction, high comp n/a set up, different cams, etc. Pretty serious modifications are required.

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Stock honda maps are pretty conservative. Here in Australia, they are set to run 95 RON (which is 91 PON over in the States). We do have 98 RON (93 PON) here as well and most of us use 98 all the time. So there is an avenue for leaning out the mixture while avoiding predetonation (although you'd have to make sure combustion temperatures don't go too high). I'm not talking about big power through cams or F/I though, just a small increase, especially in mid-range RPM.

Isn't this what Hondata has been doing with their reflashes anyway?

I'm not saying that power can't be found by tuning the a/f or ignition timing, just that doing so isn't changing the flow characteristics of the motor, so those changes don't justify an alteration of vtec engagement. It's when you're changing the air side of things that this comes into play.

so basically there is no point purchasing a vtec controler unless ur car is heavily modified?

Even then ,if u got the cash to heavily modify,then for a few hundred dollars more get an aftermarket ecu upgrade & leave the vafc on the shelf.

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Originally Posted by Civic^^

so basically there is no point purchasing a vtec controler unless ur car is heavily modified?

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only reason to ever buy one is if you just want something pretty and bling bling for in your car. As a tuning tool, they're a big waste of time.

THIS IS WHAT YOU DO IF YOU BUY A VTEC CONTROLLER FOR A STOCK MOTOR!

http://img166.imageshack.us/img166/777/toiletaf7.gif

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Originally Posted by teggiboy

i'm just curious.... because I used to drive a 180sx and the turbo kicks in at 3000rpm.... now drive a dc2r, 5700rpm seems very late.... it would be nice if it kicked in much earlier

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pfft as if vtec is like boost.
vtec = just sound

LOL :p

vtec is over rated.
boost is alot better.

For some reason,VTEC kicks in at approximately 4,000 RPM's... I recently changed my CAI to a K&N and it literally roars and you can feel the pull in G-force at 4,000 RPM... I don't know if this is good or not, but damn, 4k is perfect for me!