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2200 - VTEC
4700 - second intake runner opening up

Relative to other Honda's, the K20A3 is a torquey motor down low. However, if you check out a dyno graph, there are no sudden, significant jumps in power.
 

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hmmm i dont really notice anything at 2200rpm. i only feel car accelerating faster when the 2nd intake runner opens up. so wait. wth does the vtec do for autos?
 

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sithlord said:
hmmm i dont really notice anything at 2200rpm. i only feel car accelerating faster when the 2nd intake runner opens up. so wait. wth does the vtec do for autos?
Well, in an auto, when you punch it, you reach 3000rpms almost instantly, thanks to the torque converter. vtec does the same thing in the auto as it does in the 5 speed.
 

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monkymojo said:
huh? please explain :dontknow:
He has an Apexi V-AFC II which allows him to set when Vtec kicks in. Personally, I think setting it higher would only make you lose power in the base... :dontknow:
 

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zach12985 said:
really? i thought it was like 3500, thats where i feel the biggest jump in power
I agree. I dont feel a thing at 2200. I've always wondered about this. I feel the jump in power at 3400/3500 always.
 

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:( i wish i could notice more but i don't...but i can just drive my friend's type-s and feel it if i get sad :)
 

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that's because, as tehy say on teh hondata website, before 2200 rpms, it's essentially a 12-valve engine, while after 2200, it's a 16v engine. this allows for better emissions.
 

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This thread = stupidest newbie question that's been asked 100 times and overkilled in MANY other threads.

Do a search.
 

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it is not a 12 valve then 16 valve. it is just that below 2200 rpm you are running on one primary cam lobe (operating one intake valve)and a smaller secondary lobe (operating the second intake valve for the same cylinder). at 2200 it switches both lobes to the same size as the primary.
 

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john smith said:
it is not a 12 valve then 16 valve. it is just that below 2200 rpm you are running on one primary cam lobe (operating one intake valve)and a smaller secondary lobe (operating the second intake valve for the same cylinder). at 2200 it switches both lobes to the same size as the primary.

uhhh...http://www.hondata.com, buddy
 
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