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Old 03 Dec 2011, 09:31 pm
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Default Vtec system in Honda?

So what do people mean when they say "pop the vtec" and "yo vtec just kicked in"

EvelynThe ModifiedDog piss off you troll i live in the Uk and no one says that only the chavs in their saxo's like urself probs say it now pisss off

EvelynThe modifiefBITCH if its a stupid question why answer you dirty prickkk "fire up the quattro" what a twat i bet you don't even drive you sad sad loser, "fire up the quattro" more like get the bus pass ready knobheaddd
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Old 03 Dec 2011, 09:46 pm
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Variable timing technology automatically adjusts valve and ignition timing .
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Old 03 Dec 2011, 10:01 pm
J G J G is offline
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Posts: 53

It means they are morons.

Honda's VTEC variable valve timing system alters the valve lift at various stages of engine speed, so when the engine hits a certain speed, the valve lift & timing alters, increasing power or giving improved economy dependant on the exact engine. Performance cars like the S2000 use a three stage VTEC system that further alters valve duration & lift further up the rev range, giving even more power.
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Old 03 Dec 2011, 10:16 pm
Lee Lee is offline
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VTEC (Variable Valve Timing and Lift Electronic Control) uses a second set of cam followers to change the lift and duration of the valve timing at higher engine speeds. At a certain rpm threshold (usually above 3000-4000 rpm, the system engages the second set of cam followers). A slight change in engine note can be heard, and morons everywhere declare VTEC just kicked in, yo!
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Old 03 Dec 2011, 10:31 pm
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What they mean by those terms is that they've gone into the power camshaft profile of the engine. VTEC was primarily designed to improve fuel economy, so most Honda engines use two camshaft profiles that use VTEC to switch between electronically - one for economy, one for power. Many manufacturers use a similar system using different names (for example, Toyota has VVT-i and Mitsubishi has MIVEC).

The way they design VTEC engines is that in the low rpm ranges (idle - ~2500rpm on less powerful models, idle - 4000-5000rpm on performance models) VTEC selects the economy profile to decrease fuel consumption, eg. when you're cruising in the city or mildly accelerating, while in the high rpms you have the full power of the engine at your disposal for when you're on hard acceleration.

Using my Honda as an example (1994 Accord VTi, F22B1 engine with SOHC VTEC), when in the city or in stop start traffic only the economy cam is used (I have the 5-cog manual and I usually shift up between 2000-2250rpm). VTEC engages and switches cams at about 2600rpm (and you can feel this in the car when you hit that magic number; it starts to pull a little harder and the exhaust note changes), and I usually sit on around 2600-2800rpm when travelling interstate or on the freeway where the speed limit's 70mph. This means it's sitting right in the power cam so if I need to put my foot down to overtake or head up a steep hill, for example, it's got the power lined up for me to do it.
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Old 03 Dec 2011, 10:46 pm
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Old 03 Dec 2011, 11:01 pm
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It means they're dumb Yank ricers who think that Hondas are in some way something other than dreary boring Jap hatchbacks.

In the UK we say "Fire up the Quattro!"

EDIT: What a dumbass you are, go drive your crappy Jap pensioner chariot and stop asking stupid questions.
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