In brief
VTEC is better than VVTI-L (woteva)
because.............
its made by honda, its in a honda..
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In brief
VTEC is better than VVTI-L (woteva)
because.............
its made by honda, its in a honda..
Not exactly...Quote:
Originally Posted by SPEEDCORE
Toyota VVTL-i offers variable lift & timing...
But not varable duration as Vtec does...
Still not apples & apples...
DOHC Vtec & VVTL-i though different are relativly comparable...
i-VTEC goes one better...
With both variable lift, duration & timing....
Next will probably be varable timing on the exhaust side also... :?:
If you do comapare the two systems...
IMO the Honda system is superior...
That is to say, the VVTL-i can be made to match the output of DOHC Vtec... (same capacity etc, similar mods etc)
The problem with the Toyota system is the lack of aftermarket support...
Moreover the lack of demand for these parts & therfore the lack of availablity due to no market...
At the end of the day... To different approches to the same/similar end...
Myself, I like them both...
Cheers
must remember...whois the real Valve Timing master...honda...they are the one who develop it..so...i think that is why...do you think a copy is better than a real stuff?
Stupid response number #88 from pgclee. Honda didn't develop variable valve timing, they refined it and put it into mass production. This was already mentioned in another post.
Lay the smack down Pete :D
LOL you harsh kunt!Quote:
Originally Posted by Setanta
I was under the impression that VTEC only provides variable lif and timing. Wouldn't you have to change the lobe profile to have variable duration? I belive Porche's variocam is capable of this.Quote:
Originally Posted by TODA AU
I thought the main difference b/w VTEC and i-VTEC was continuosly varliable timing in the latter ?Quote:
Originally Posted by TODA AU
Also.......i-VTEC has continuosly variable timing on both cam shafts I'm pretty sure.
Normal DOHC VTEC provides variable lift & duration.Quote:
Originally Posted by wynode
(Not actual timing as such)
Timing remains constant except for the change in lobe centres fixed within the manufacture of the camshaft, when cam profiles are swapped.
Such as would be offered by a low cam of 190deg @ 7mm lift (116 LCA)
& high cam of 240deg @ 10.2mm lift (107 LCA)
The i-VTEC adds + or - 25deg to the lobe centre angle of the intake camshaft only.
For the sake of example, the same cam as above...
With an intake LCA of 90deg~140deg
This is a change in timing.
The Toyota system on the other hand doesn't change profiles so the total duration remains the same, but the lobe centres & lift are affected.
Oh I could have sworn it was both intake and exhaust......thanks for clearing that up.Quote:
Originally Posted by TODA AU
Regarding the 1ZZFE Corolla's...15.8 stock apart from 205/40/17's and a big arse stereo :). Not blindingly quick by any means, but respectable for a shopping cart. Why buy a Sportivo when it would be so much easier to simply burn the cash?
My friend owns that corolla that beat the b16a on numerous occassions.
Though VTEC is amazing it lacks the initial Torque.
I was there the night it happen.
Both cars had a passengers one so it was a far race.
To determine outright speed, from start to finish, they did a sprint to the end of fourth gear. The rolla was ahead all the way by half a car length. Approx speed not more than 100kms over set road limit.
This is more an issue with emission based differential lift low cams rather than the engine itself...Quote:
Originally Posted by Grimlock
Spec B's solves the lack of initial torque quite smartly.