I think i spelled those both right, if i haven't then i appologize. Anyway I was wondering how the different versions vary in performance applications (not fuel economy ) are they pretty much identical? if not, whos is better and why?
and if i totally botched the above (i think its vvTi) im talking about the toyota vtec version

 

well its VVTL-i. in the GTS versions and VVTI in the GT.
if i am not wrong i think that the VVTL-i is more comparable to the new i-VTEC.
the will be pros and cons to each.

 

I am not an engineer, however one has shared with me the difference.
The VVti only changes valve overlap and duration. i-VTEC, introduces
valve overlap changes on the fly, valve timing change at changeover
and LIFT. LIFT on the cams is the biggest difference. Traditional VTEC
manipulates the low to high cam LIFT while changing the valve opening
and closing stats when the high cam is engaged. The Honda telemetry in
the ECU is also constantly changing under VTEC, even moreso in i-VTEC.
Say for instance the computer never changed the AFR or the timing curve
when the large cam lobe is engaged? You would have non-ideal settings.
It is known as Intelligent Variable Timing/Lift and Electronic Control.
Not only does it work great in the Honda motor, the engineers also know
best how to gear thier trannys to take the most advantage of this, keep this
in mind if you shift and fall out of VTEC and then have to engage it again...
what good would that be. I have heard this is a primary GRIPE of anyone
that knows honda's system and then drives the GT-S. If you take a Honda
to the upper rpms and shift, the RPMs drop within the VTEC range, still accelerating. All in all its pretty damn cool not bad for going on
15 year old Honda technology.
technology

 

true the toyota system engages @ like 6200 i think and the tranny is not setup w/ gears low enough to take advantage of it plus the gts is ugly anyways

vtec ownz vvti

 

okay wonderful information , whats the difference between vtec and new i-vtec? or was it already stated (kinda blazed when i read this)

 

yea man I already included this, no worries. the intake cam variation is what is added under i-VTEC. This allows the motor to choose its overlap duration based on a slew of inputs from the motor to make the best overall EFFICIENCY. The K series engines also have roller cam followers STOCK which is NIOOOICE Not to mention 86x86mm owns... no doubt. With the B series cars, we need to upgrade the cams and introduce static cam timing changes to make more power since the computer doesnt have the VTC: variable cam timing control on the intake cam found in the K motor. Everything else applies.

 

i work for toyota, everything everyone said is pretty much right
VVTi is like adjustable cam gears on the fly (continuously variable), VVTLi is the same but with lift (2different lobes like vtec, except vtec isnt continuously variable, its just vtec/non vtec like a on/off switch)
i drive the gt-s alot and i really dont like it, the lift kicks in way too high (6000) and redlines at 8 so theres not much to do with it

 

i-vtec is where honda introduces the continuously variable intake cam timing into the real-time tuning equation. I have driven an RSX type S and I am not fond of the car, the technology is great. I prefer the feel of the GSR or ITR modified. Not to mention the parts and tuning process for the B series car is much more available to joe consumer. havent driven a GT-S yet, however I have ran with beaten them and the owners usually get pissed They arent slow, thats for sure. If you can beat them with a GSR you are doing something good. Modded TypeRs leave em with time enough for a


[Modified by MikeSarr_GSR, 12:07 PM 8/31/2002]