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VTEC vs VVTLi vs VVTi vs MIVEC #61944 Nov 20, 5:24am Nov 20, 5:24am
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Kody OP
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VTEC vs VVTLi vs VVTi vs MIVEC
Which one will win?? arnt they all the same?

Re: VTEC vs VVTLi vs VVTi vs MIVEC [Re: Kody] #61945 Nov 20, 6:33am Nov 20, 6:33am
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from my understanding, vtec (variable/valve timing and electronic lift control) uses the alternation of the cam profiles to produce the band they get (however i think it can be changed to kick in at lower rather than higher RPM, but is no where near as drastic a "boost" as vvtli), vvtl-i (variable valve timing and lift intelligence) uses alternating camshafts to produce the power band we get at 6k rpm, vvt-i(variable valve timing with intelligence) i don't think uses alternating cams, but i know it makes the engine run at optimum performance, timing wise, throughout the whole rev range, mivec(mitsubishi innovative valve timing and lift electronic control system) uses a very similiar alternating of the cam profiles, i've never riden in one, but i hear they engage at about 3,500 RPM...of course they don't have the 7800 redline...

in all, i think vvtl-i is 'better' only because of the very noticable power it creates when hit, and it is a lot newer than vtec and all that...takin after variocam, from porche.

EDIT: i just touched base with all these, this isn't an entire explanation...there are articles on ecelica that would help you better understand vvtli and vvti. Anyone feel free to make corrections or add shit on thumbsup


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Re: VTEC vs VVTLi vs VVTi vs MIVEC [Re: Kody] #61946 Nov 21, 11:37am Nov 21, 11:37am
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Michael Aristide
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VTEC utilizes cam-changing only. The only other companies that use this only are Nissan's NEO VVL and Mitsubishi's MIVEC. Toyota uses cam phasing (VVT-i) in the GT (I.E. i-VTEC in base RSX, Nissan NCVS, BMW Double VANOS), and cam-phasing plus cam-changing (VVTL-i) in the GTS (I.E. Honda i-VTEC in RSX Type S, Porsche VarioCam).

Cam-changing = Variable valve lift
Cam-phasing = Variable valve timing

IMO, the best technology is variable valve timing and lift which is incorporated in the Celica GTS, Acura RSX Type S, Porsche 911 Carrera, etc...

Re: VTEC vs VVTLi vs VVTi vs MIVEC [Re: Kody] #61947 Nov 21, 10:00pm Nov 21, 10:00pm

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not too sure but I say VVTL-I. I was riding in my friend's civic and asked if he could take the car up to VTEC, didnt kick in really hard as I thought. Then I had him get in my GTS and took it to lift...He said lifts kick in way harder than vtec...dont know anything about MIVEC tho

Re: VTEC vs VVTLi vs VVTi vs MIVEC [Re: Kody] #61948 Nov 22, 12:51am Nov 22, 12:51am

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VVTLi is best but still doesent have that much support in aftermarket like Vtec. Lift is best.

Re: VTEC vs VVTLi vs VVTi vs MIVEC #61949 Nov 22, 3:22am Nov 22, 3:22am
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Pittsburgh, PA
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I think they all use the same NA technology of valve timing and valve phasing. It's just 2ZZGE's VVTL-I kicks in harder because the cams were designed to do so. I'm sure Honda with their VTEC or Porsche with their Variocam could do the same if they designed aggressive high speed cams like the GTS. By the way, the kick when lift engages isn't too good of a thing in racing as it destabilizes a car during cornering.

Re: VTEC vs VVTLi vs VVTi vs MIVEC [Re: TeaQBD] #61950 Nov 22, 9:49am Nov 22, 9:49am
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Originally Posted by TeaQBD
I think they all use the same NA technology of valve timing and valve phasing. It's just 2ZZGE's VVTL-I kicks in harder because the cams were designed to do so. I'm sure Honda with their VTEC or Porsche with their Variocam could do the same if they designed aggressive high speed cams like the GTS. By the way, the kick when lift engages isn't too good of a thing in racing as it destabilizes a car during cornering.

not if you stay in lift when you cornering...which prevents loss of power when exiting the corner too... idunno


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Re: VTEC vs VVTLi vs VVTi vs MIVEC [Re: Kody] #61951 Nov 22, 2:47pm Nov 22, 2:47pm
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Michael Aristide
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How hard it kicks in has NOTHING to do with how effective a technology is. All that means is that maybe the low speed cam might be less agressive than say in a VTEC car so the changeover is more apparent. That type of logic spells R-I-C-E-R all the way. Research your shit first. My previous post says what different types of systems companies use. Read up on technical reports to decide which is best, not a butt dyno. rolleyes

Re: VTEC vs VVTLi vs VVTi vs MIVEC [Re: TeaQBD] #61952 Nov 22, 2:50pm Nov 22, 2:50pm
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Originally Posted by TeaQBD
I think they all use the same NA technology of valve timing and valve phasing. By the way, the kick when lift engages isn't too good of a thing in racing as it destabilizes a car during cornering.


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