v-tec or vvt-i?
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From: Riverside/IE, CA
Originally Posted by mgithens
VTEC changes the point where the valve begins to open and how much lift the valve will receive - so at a specific rpm the engine jumps to a totally different cam lobe and performance is completely different...
VVT changes the point where the valve begins to open, but the lift remains the same... the difference is that over the rpm range the valves open sooner as the revs climb...
these provide two very different engines... I prefer the latter, because the VTEC requires the driver to maintain the upper rpm to get a sporting engine, whereas the VVT allows for a smoother delivery of power.
VVT changes the point where the valve begins to open, but the lift remains the same... the difference is that over the rpm range the valves open sooner as the revs climb...
these provide two very different engines... I prefer the latter, because the VTEC requires the driver to maintain the upper rpm to get a sporting engine, whereas the VVT allows for a smoother delivery of power.
VVTi is as mgithens described above. Toyota applies this in the mid-range rpms for daily driving. VTEC has the advantage over VVTi at high RPMs but VVTi is better at mid-range.
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From: Denver, CO
Originally Posted by flat__tires
you know... this is the second topic i've found bashing on other vehicles and glorifying scions... i thought there was another forum for this kind of sh*t. lets get some things straight first... when was vvt-i or vvtl-i first out on a toyota vehicle? when was the vtec or i-vtec first out on a honda vehicle? 1.5L vvt-i=103hp? 1.6L vtec=160hp? hmm... vvt-i=new technology? vtec=old technology? if honda has been able to produce such highly coveted motors using old technology... why is toyota isn't able to do the same with new technology? just my $0.02
so yes, your example of a Honda engine making more power per liter is proof that VTEC can make decent power... but you fail to recognize that the VVT setup in the xB is proof that you can have GREAT economy...
your example also compares a $20k car vx the $13k and $14k Scions... sure more money can make more power, but that has to be the goal...
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From: GU
so yes, your example of a Honda engine making more power per liter is proof that VTEC can make decent power... but you fail to recognize that the VVT setup in the xB is proof that you can have GREAT economy...
your example also compares a $20k car vx the $13k and $14k Scions... sure more money can make more power, but that has to be the goal...
your example also compares a $20k car vx the $13k and $14k Scions... sure more money can make more power, but that has to be the goal...
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From: FL
VVT-i has been used for performance engines. It's just that those engines were never brought over here. Toyota was able to bring out some high HP engines using VVT-i on the 4A-GE and the 3S-GE engines. Toyota even went a step further and made a Dual VVT-i 3S-GE.
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From: FL
Originally Posted by mgithens
I guess it would be nice if Toyota would make a MR2000 or something to compete with the S2000... and I do mean for the USA...
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I did a search to compare the performance between vtec and vvt-i. Between Honda Jazz vtec and scion xB vvt-i. Both have 1.5 liter engine
Let the numbers speak for themselves...
Scion xB Jazz
DOHC 4 cylinders, VVT-i 16 valve SOHC, 4 cylinders, 16 valve VTEC
Displacement 1496cc 1497cc
Horsepower 108hp @ 6,000 rpm 108.6 @5,800
Torque 105 lb-ft @ 4200 rpm 105.5 lb-ft @ 4800 rpm
Although it is not an identical comparison, it give you some idea. If honda make a DOHC 1.5L engine, it should gives a better comparison.
IMO, VVT-i gives a better low-rev performance -> better fuel economy. VTEC gives a better high-end performance -> not for a regular driver like me. Also a car with VTEC engine is more expensive. Moreover, VTEC engine has more electronic/mechanic adjustments, it has a lower long-term reliability than the VVT-i's. So, it's not worth an inverstmet $$$$ for me, I prefer VVT-i
.
Let the numbers speak for themselves...
Scion xB Jazz
DOHC 4 cylinders, VVT-i 16 valve SOHC, 4 cylinders, 16 valve VTEC
Displacement 1496cc 1497cc
Horsepower 108hp @ 6,000 rpm 108.6 @5,800
Torque 105 lb-ft @ 4200 rpm 105.5 lb-ft @ 4800 rpm
Although it is not an identical comparison, it give you some idea. If honda make a DOHC 1.5L engine, it should gives a better comparison.
IMO, VVT-i gives a better low-rev performance -> better fuel economy. VTEC gives a better high-end performance -> not for a regular driver like me. Also a car with VTEC engine is more expensive. Moreover, VTEC engine has more electronic/mechanic adjustments, it has a lower long-term reliability than the VVT-i's. So, it's not worth an inverstmet $$$$ for me, I prefer VVT-i
.
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From: FL
Originally Posted by Kong
I did a search to compare the performance between vtec and vvt-i. Between Honda Jazz vtec and scion xB vvt-i. Both have 1.5 liter engine
Let the numbers speak for themselves...
Scion xB Jazz
DOHC 4 cylinders, VVT-i 16 valve SOHC, 4 cylinders, 16 valve VTEC
Displacement 1496cc 1497cc
Horsepower 108hp @ 6,000 rpm 108.6 @5,800
Torque 105 lb-ft @ 4200 rpm 105.5 lb-ft @ 4800 rpm
Although it is not an identical comparison, it give you some idea. If honda make a DOHC 1.5L engine, it should gives a better comparison.
IMO, VVT-i gives a better low-rev performance -> better fuel economy. VTEC gives a better high-end performance -> not for a regular driver like me. Also a car with VTEC engine is more expensive. Moreover, VTEC engine has more electronic/mechanic adjustments, it has a lower long-term reliability than the VVT-i's. So, it's not worth an inverstmet $$$$ for me, I prefer VVT-i .
Let the numbers speak for themselves...
Scion xB Jazz
DOHC 4 cylinders, VVT-i 16 valve SOHC, 4 cylinders, 16 valve VTEC
Displacement 1496cc 1497cc
Horsepower 108hp @ 6,000 rpm 108.6 @5,800
Torque 105 lb-ft @ 4200 rpm 105.5 lb-ft @ 4800 rpm
Although it is not an identical comparison, it give you some idea. If honda make a DOHC 1.5L engine, it should gives a better comparison.
IMO, VVT-i gives a better low-rev performance -> better fuel economy. VTEC gives a better high-end performance -> not for a regular driver like me. Also a car with VTEC engine is more expensive. Moreover, VTEC engine has more electronic/mechanic adjustments, it has a lower long-term reliability than the VVT-i's. So, it's not worth an inverstmet $$$$ for me, I prefer VVT-i
.
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From: SC
I have several friends who have owned Hondas w/ VTEC for several years and most (if not all) haven't had any issues w/ the VTEC system. Once again VTEC and VVT-i do two different things and have different purposes. There's no point in comparing the two.
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From: FL
Originally Posted by Mistertwo
I have several friends who have owned Hondas w/ VTEC for several years and most (if not all) haven't had any issues w/ the VTEC system. Once again VTEC and VVT-i do two different things and have different purposes. There's no point in comparing the two.
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BLADDER_MASTER, I'm pretty sure that Honda does a good job putting the engine together. Although vtec engine has more parameter to adjust, the engine is built to last longer than the car itself, if you maintain it well. Reliability problem may come 8-10 years later and by that time, something else may goes wrong.
The vtec engine has a good top-end performance, regular driver will not see it's benefit as much as the racer do. Toyota does a better job keeping the engine cost low while having good performance, for regular driver. If you are going mod your car anyway and don't concern about the cost, none of this will matter much since both vtec and vvt-i are good engine. In this case, I will go with VTEC. Anyway, you buy whatever car you that suit you. Hope this help ;)
The vtec engine has a good top-end performance, regular driver will not see it's benefit as much as the racer do. Toyota does a better job keeping the engine cost low while having good performance, for regular driver. If you are going mod your car anyway and don't concern about the cost, none of this will matter much since both vtec and vvt-i are good engine. In this case, I will go with VTEC. Anyway, you buy whatever car you that suit you. Hope this help ;)
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From: FL
Originally Posted by Kong
BLADDER_MASTER, I'm pretty sure that Honda does a good job putting the engine together. Although vtec engine has more parameter to adjust, the engine is built to last longer than the car itself, if you maintain it well. Reliability problem may come 8-10 years later and by that time, something else may goes wrong.
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From: Ocean Springs MS
I absolutely LOVE Toyotas, but anyone on here who says that VTEC sucks or doesn't work, has obviously not gotten to drive an S2000. Once 6500rpms hits in that thing, hold on to the seat of your pants.
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Scinergy
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From: Denver, CO
Originally Posted by ddriggers2
I absolutely LOVE Toyotas, but anyone on here who says that VTEC sucks or doesn't work, has obviously not gotten to drive an S2000. Once 6500rpms hits in that thing, hold on to the seat of your pants.
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http://www.we-todd-did-racing.com/we...NkZmQzMXk1NDE=
i sold this 97 itr some months back. 207whp NA.
btw..save as
i sold this 97 itr some months back. 207whp NA.
btw..save as
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From: Tucson, AZ (dorm room)
Originally Posted by TwiztedTC
VVTL-i is found in my 2ZZ-GE motor in my Celica and it is far more refined then V-TEC found in different honda motors like the B16A2, B18B, B18C1 or B18C5...
im gonna miss "Lift" at 6000 rpm's when i get my tC
im gonna miss "Lift" at 6000 rpm's when i get my tC
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From: Atl
In a small sports car like the Scion I wish they had something like vtec. It just seems that Honda has better engineering...for all you naysayers out there who're gonna try to shoot me down- think about this. Why is it that a 1.8 liter Honda engine w/vtec (B18C) has the same horsepower as a 2.4 liter Toyota engine with vvt-i? ____, even a civic si w/a 1.6 has the same horsepower! A tC can only just beat a stock Si and it has a much bigger engine, not to say I don' t like Toyota, since I just got a tC, but they just need to step up their engineering game! ...or stop putting sedan engines into sport coupes!
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From: Denver, CO
Originally Posted by English
In a small sports car like the Scion I wish they had something like vtec. It just seems that Honda has better engineering...for all you naysayers out there who're gonna try to shoot me down- think about this. Why is it that a 1.8 liter Honda engine w/vtec (B18C) has the same horsepower as a 2.4 liter Toyota engine with vvt-i? ____, even a civic si w/a 1.6 has the same horsepower! A tC can only just beat a stock Si and it has a much bigger engine, not to say I don' t like Toyota, since I just got a tC, but they just need to step up their engineering game! ...or stop putting sedan engines into sport coupes!
the more complex answer is longevity... Toyota has established a reputation for 300,000 mile cars... Honda is more performance oriented... lower compression, larger displacement engines have a habit of lasting longer... VW engines 6.7 to 7.0 compression... super cheap... Honda builds the S2000 that #1 is 12:1 compression and #2 has VTEC, which encourages to the driver to "drive it like it was stolen" in order to enjoy that peformance...
so it doesn't come down to fairy dust or technological skill - it is about choice...