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king me

attn k_w and realityhammer

Posted on 2006.01.25 at 22:39
a friend of mine with a 2-liter s2000 is thinking of adding a VTEC controller to his car. he hasn't done any other mods yet, and i'm thinking that switching the changeover point won't do much without a few supporting bolt-ons.

should he get at least cai/header/cat/exhaust out of the way first, or am i off-base on this one? any other advice?
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Comments:

betternewthings at 2006-01-26 06:45 (UTC) (Link)
the changeover point is well past the epa fuel economy and emissions testing point, thus it's not pushed around by arbitrary regulations.

given that, why in the name of allah would honda's talented engineers choose to put it in the wrong place?
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Colonel Angus
scosol at 2006-01-26 07:07 (UTC) (Link)
> given that, why in the name of allah would honda's talented engineers choose to put it in the wrong place?

in my daewoo, the airbox butterfly cutover was (i felt) too high-there was only 500rpm or so up there, and it really just got sluggish in 5000-5500 before it kicked in-
so i used the poor mans method to lock it in high (ziptie) :)
i spent most of my time above 4k anyway, so i thought the tradeoff was worth it.
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betternewthings at 2006-01-26 07:41 (UTC) (Link)
that's probably for emissions reasons. i think the second cam on the 2.0 only comes on at a range above the emissions testing range anyways.
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Colonel Angus
scosol at 2006-01-26 09:16 (UTC) (Link)
yeah that's what i figured-

but not being a hondaphile i can't really help here-

although i would surmise that the high profile as installed would be set to overlap too much right above redline, so the gains in moving the trigger down lower might be there, and they might not...
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betternewthings at 2006-01-26 18:03 (UTC) (Link)
oops!

i guess we all know what happens when we assume.

just looked at a stock 2.0 dyno. there's a huge jump in torque at the switchover.

if the switchover point was optimal, it would be seamless.

guess it does help to move it down a few hundred rpm.
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Got Habits
wetnun at 2006-01-26 10:40 (UTC) (Link)
He'll probably notice a minor difference but obviously it would be more noticable if he had other modifications. Honda motors normally suck in terms of torque. So the best option seems to be spin it real fast and let of move as much air a possible. :)
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