Why dont all cars have vtec? (or equilvilent)

VTEC is unneccesary on most cars, so why add it?

It only really allows a car to have race cams without losing low down performance and a smooth idling.

That Fiat system looks good along with the other technologys currently in the market.
 
rypt said:
Toyota's Valvematic + Dual VVT-i would disagree.
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BMWs Valvetronic allows a petrol engine to run without a throttle, not sure the Toyota system does that.

Anyway, Fiats Multiair is the most advanced these days. Complete control over the valve lift and timing independent of the cam.
 
Simon said:
VTEC is unneccesary on most cars, so why add it?

It only really allows a car to have race cams without losing low down performance and a smooth idling.

That Fiat system looks good along with the other technologys currently in the market.
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Exactly, it'd be extra cost and extra complexity that just wouldn't be needed on most cars, so why bother?

On sporty models yes it's good as it allows you to run a cam profile higher up the rev range that would normally run like poop lower down and at normal idling rev ranges (i.e. not having to idle at 2k rpm or something silly :) ).

Remember thinking about 'camless' valve control years ago, guessing it'd be again pretty complex but that it would be cool. Some kind of eletronic valve control, no idea how you'd do it or even if it'd be feasible.
 
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Alibaba99 said:
BMWs Valvetronic allows a petrol engine to run without a throttle, not sure the Toyota system does that.

Anyway, Fiats Multiair is the most advanced these days. Complete control over the valve lift and timing independent of the cam.
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Valvematic doesn't use throttle either, and Honda have a similar AVTEC due soon.
 
Doesn't the average Ferrari engine have like 4 cam shafts? So that whatever the rev range it can deliver a few buckets of torque.

I don't really think VVT-i is the same thing. That's variable valve timing. Just about every modern car has this already anyway for emissions nowadays, if nothing else.
 
rypt said:
Indeed, vtec is about having normal mode at low revs, with decent fuel econ .. and then more power at higher revs with crappy econ - instead of maximum possible power at every rev point
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Ironically the spread of torque is gives the more power over a wider rpm spread over a single cam profile.

My car has VTEC, you should see what happens what that kicks in...
 
NathanE said:
Doesn't the average Ferrari engine have like 4 cam shafts? So that whatever the rev range it can deliver a few buckets of torque.
.
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Doesnt the average car engine have 2 cams per cylinder bank....

I think the buckets of torque come from the displacement.... I would thing your average Ferrari engine is pretty top end peaky though?
 
Honda invented VTEC to solve the issue of high performance but good mpg, with todays fuel costs now very ahead of it's time. At the time the Integra Type R was produced it would lap tracks quicker than most 2.0 turbo cars for similar money.
 
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It's funny because it's loud, like your m...na I'm just kidding - it's a 1990 Integra and the engine sounds like a B16a going by my expert dashboard knowledge and engine acoustics expertise.

Actually it's in the video description :)
 
Thats gonna be an engine swap then. And it looks like whatever ECU its running is totally ass.

Yeah its the Mk2 Integra, I wanted one of those dashes for my VTEC Rover Coupe. The JDM Version with the B16a had 170bhp.
 
JasonM said:
Honda invented VTEC to solve the issue of high performance but good mpg, with todays fuel costs now very ahead of it's time. At the time the Integra Type R was produced it would lap tracks quicker than most 2.0 turbo cars for similar money.
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Honda didn't come up with the idea first, though I do think they perfected it.

<3 Vtec :)
 
The OP is like asking why not all cars are turbo charged. Or why not all cars have over 2ltr capacity. Different engines have different characteristics. VTEC is just one type of "additional" tech to suit certain engine applications.
I think what the OP might be trying to ask, is why don't you just put VTEC equivalent on an engine just because you can, to make it "better".
Well again, different engines have different characteristics and are designed in ways to output their final power and torque curve usually at a compromise of sort. You wouldn't design a turbocharged sports car engine to use VTEC as well. Different compression ratios and characteristics make it pointless. VTEC is "a" method of delivering a higher performance engine at higher rpm which is fairly specific to the way such an engine would be designed.
 
bwarpppp, bwarrrrrrrrrrr, bwarrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr MAAAAAAAAAAAzomfgAAAAAAAAAAAAAAAIIII

vtec, it just kicked in, yo :cool:

to be honest if all cars had VTEC half the nation would be wiped out in their first week on the roads, death tolls would go through the roof.

ask any real racer: it doesn't matter whether you win by an inch or a mile, vtec is vtec. yo.
 
Clarkey said:
But the typical 'VTEC y0!' setup doesn't have any effect at all on the low end :confused:


I think this thread has made it clear that there is a widespread misunderstanding of VTEC.
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Testing a CTS and a Focus 2.0 back to back - it was obvious to me that there was a difference. First thing I did when I got out of the car and out of earshot of the salesman was comment to the other half about how it felt slower at the low end.
 
Does vtec kick in at 6k revs? Surely thats a bit high? Wouldnt people prefer it at more like 4.5k? After all, if you're driving sensibly you wont be going higher than 3.5k until you want the power?
 
thecremeegg said:
Does vtec kick in at 6k revs? Surely thats a bit high? Wouldnt people prefer it at more like 4.5k? After all, if you're driving sensibly you wont be going higher than 3.5k until you want the power?
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The engine revs to 9k or so, so 6k is fine.
 
thecremeegg said:
Does vtec kick in at 6k revs? Surely thats a bit high? Wouldnt people prefer it at more like 4.5k? After all, if you're driving sensibly you wont be going higher than 3.5k until you want the power?
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This is why the VTEC systems have two cam profiles - to maintain low end performance when driving normally.

VTEC operates at 6200rpm on the S2000, one thing to remember is the higher revs allows shorter gears, they are not crap lowe down and will happily pull from 30mph in 5th.
 
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