I was just wandering what is the difference in toyotaas VVT-I and their VVTL-I? my friend was arguing with me when i got my 2000 GT-S that it had a VVT-I in it and i told him it was the VVTL-I. now I have seen the VVT-I but i dont know what the difference in the two is.......
VVT-I and VVTL-I
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VVTi = Variable Valve Timing
VVTLi = Variable Valve Timing with Lift
They both use continually variable cam timing to get the best torque, HP and fuel economy depending on whatever varibles the ecu is offered though various sensors.
The difference between the two is that VVTLi uses a second cam profile designed specifically for high rpm power. If you notice that your car seems to get a bit of a boost around 6700rpm, thats the second cam profile kicking in, otherwise referred to as hitting lift or being in lift. It works similarly to VTEC.
VVTLi = Variable Valve Timing with Lift
They both use continually variable cam timing to get the best torque, HP and fuel economy depending on whatever varibles the ecu is offered though various sensors.
The difference between the two is that VVTLi uses a second cam profile designed specifically for high rpm power. If you notice that your car seems to get a bit of a boost around 6700rpm, thats the second cam profile kicking in, otherwise referred to as hitting lift or being in lift. It works similarly to VTEC.
hmmm....can you move the "lift" point on the vvtli engines?
kinda like moving the vtec point with a vafc?
kinda like moving the vtec point with a vafc?
Deep said:
yeah, that's the impression that I was under too....
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The sheer joy of hitting lift, shifting of hitting 8500 rpm rev limiter, the sweet engine sound and getting that kick in your back when the lift kicks in is what explains VVTL-i.
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I know it seems vtec is more popular than vvti because everone talks about it, but its really not... vvti is used by lamborghinis, fords and porches inorder to have more torquey engines.2000GTS said:
The difference between vvti and vtec: VTEC "kicks in" at higher rpm levels to improve performance. This does not offer continuous variable valve timing.
Instead of the on/off system that VTEC uses, VVTi offers continuous variable system that maximizes valve timing throughout the rpm range.
Does this mean honda's vtec is not intelligent? The new accords finally upgarde from their older SOHCs to DOHCs, and along with that came iVTEC. Oh but guess what, Toyota already has that covered too with their VVTL-i with is still more superior.
I have, I wasn't impressed with its performance at low RPM. I also felt that my camry handled better.mr2freak said:
I didn't test it at high RPM's though. Just that little mini-Atuocross event at our last TN meet.
I can't remember who said it best so forgive fo not remembering your name but...
Vtec is basically: Turbo hype+Turbo Lag-Turbo Power= Vtec.
I seem to favor vvti over LI just because I have a decent almost "boost" from zero to the line compared to a high boost from like 6.5-8, which is why I favor the normal corollas over the XRS. not hating on them just my 2 cents.
Vtec is basically: Turbo hype+Turbo Lag-Turbo Power= Vtec.
I seem to favor vvti over LI just because I have a decent almost "boost" from zero to the line compared to a high boost from like 6.5-8, which is why I favor the normal corollas over the XRS. not hating on them just my 2 cents.
My friend (toyota fan)told me about this discussion since it seemed a little biased. Im not here to flame/troll or anything like that, just a good technical discussion.
There are two different VTEC systems. The first one is the conventional VTEC system which is basically a on/off point and it switches to a bigger cam lobe which basically changes the cam overlap, cam duration and valve lift. Essentially the valve opens longer and lifts higher.
The newest VTEC system implemented by Honda is the i-VTEC system. This is what is currently in the K series engines (RSX Type S, Civic Type R (EP3), Integra Type R (JDM DC5 model), TSX and some of the new accords). This not only has a the mechanism of the conventional VTEC system but it also has the continuous cam timing driven by a VTC (variable timing control) mechanism.
So with this current system. Cam angle is continously varied for economy, low emissions and performance. On the k series it is up to 50 degrees advance and 50 degrees retard. Dont know about the VVTL-i system, maybe one of you can find that and post it up.
Also, some of you are saying the VTEC is all about highend. Sure maybe the conventional VTEC, but the i-VTEC has some madass lowend...especially when tuned with Hondata's K-Pro ECU (i have this and i love it!!). My Type S originally came with a 5800 VTEC point, but with K-Pro i lowered (tuned) it to 4300 and now the midrange is so smooth and pulls strong all the way up. Now dont get me wrong, my car had good midrange stock, but im just saying that with proper tuning it can be made even better.
There are two different VTEC systems. The first one is the conventional VTEC system which is basically a on/off point and it switches to a bigger cam lobe which basically changes the cam overlap, cam duration and valve lift. Essentially the valve opens longer and lifts higher.
The newest VTEC system implemented by Honda is the i-VTEC system. This is what is currently in the K series engines (RSX Type S, Civic Type R (EP3), Integra Type R (JDM DC5 model), TSX and some of the new accords). This not only has a the mechanism of the conventional VTEC system but it also has the continuous cam timing driven by a VTC (variable timing control) mechanism.
So with this current system. Cam angle is continously varied for economy, low emissions and performance. On the k series it is up to 50 degrees advance and 50 degrees retard. Dont know about the VVTL-i system, maybe one of you can find that and post it up.
Also, some of you are saying the VTEC is all about highend. Sure maybe the conventional VTEC, but the i-VTEC has some madass lowend...especially when tuned with Hondata's K-Pro ECU (i have this and i love it!!). My Type S originally came with a 5800 VTEC point, but with K-Pro i lowered (tuned) it to 4300 and now the midrange is so smooth and pulls strong all the way up. Now dont get me wrong, my car had good midrange stock, but im just saying that with proper tuning it can be made even better.
whoever said that obviously doesnt know what VTEC is.Flea said:I can't remember who said it best so forgive fo not remembering your name but...
Vtec is basically: Turbo hype+Turbo Lag-Turbo Power= Vtec.
I seem to favor vvti over LI just because I have a decent almost "boost" from zero to the line compared to a high boost from like 6.5-8, which is why I favor the normal corollas over the XRS. not hating on them just my 2 cents.
I think thats what a toyota fanboy/ricer would say.
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