vvt? - Toyota Nation Forum : Toyota Car and Truck Forums

dcninja757 · 08-31-2009, 11:22 PM

any chance we could rig up VVT on our old motors? lol

Gibson99 · 09-01-2009, 11:40 AM

sure, but it would be easier to trade in for a vehicle that already has it.

i think it would be about as easy and effective as trying to convert a non-abs car to one with abs. sure, it might work, but will be a ton of work, and still probably won't be as useful or effective as a car that came with it from the factory. too little gain to justify the cost/labor.

dcninja757 · 09-01-2009, 12:36 PM

not just a head swap like the ls/vtec motors? I'm hoping someone who has done this can chime in, I'm sure someone has, right?

Gibson99 · 09-01-2009, 01:16 PM

no i think you also need the ecu and engine harness to go with it, to control the vvti. plus there's two heads to swap, not just one.

i'm also curious to know how a vvti ecu would handle boost, a'la trd sc. i wouldn't think there'd be a problem bolting the sc onto the vvti'd motor, as long as you keep your existing single throttle body (the vvti ones i've seen have twin TB's for some reason).

i don't know what differences there are in the lower intake manifold either - there could be something different there... no way to know without having parts side by side and taking measurements, test fitting, or if you're lucky, just comparing part numbers.

bigbird · 09-01-2009, 03:34 PM

just swap in a 2az-fe, and start a trend.

Toysrme · 09-02-2009, 02:55 AM

suggestion, go stick with hondas.
first understand that intake only vvt-i is asmuch for the elimination of EGR equipment as it is power production.

then understand if you were to pull a 1994 1mz-fe out and stick a vvt-i 1mz-fe in it - you'd have a change amounting to jack squat afew measily horsepower that could have easily be achived other ways. and for the same cost could have been surpassed by atleast a hundred horsepower other ways.

ashybone · 09-02-2009, 04:15 AM

glad i went wit a non vvti 1mz for my i4-v6 swap

Gibson99 · 09-02-2009, 09:45 AM

Quote:

Originally Posted by ashybone

glad i went wit a non vvti 1mz for my i4-v6 swap

i dunno... i didn't realize the vvti ones didn't have EGR. that would be nice for being s/c'd!

Typrus · 09-02-2009, 11:23 AM

It'd be nice if we could have VVTL-i....

For those who haven't looked into it, all VVT does is vary the valve timing. Not the lift. VTEC varies the lobe profiles, affecting lift, duration, etc. They do this with an oil-actuated "pin" that locks in a follower profile. Like having 2 different camshafts. Whereas the VVT just changes the cam relation to the crank. So the timing. The profile stays identical. Now, VVTL-i is a different story, as it has the seperate profile that locks in, as well as being able to vary valve timing. Pretty awesome.

Gibson99 · 09-02-2009, 02:22 PM

Typrus - you're right, i had forgotten that distinction. i dunno if there's a vvtli 1mzfe, but i don't think there is. but i still stand by what i originally said - lots of effort for too little gain. toysrme said basically the same thing a few posts up.

bigbird · 09-02-2009, 03:00 PM

Quote:

Originally Posted by Gibson99

i dunno... i didn't realize the vvti ones didn't have EGR. that would be nice for being s/c'd!

its never really caused me any problems(though im only at 4psi). just blocked it off for the gen3. then when emissions time comes....hook in a pice of hose and pass with flying colors...or just bearly

.

Quote:

Originally Posted by Typrus

It'd be nice if we could have VVTL-i....

For those who haven't looked into it, all VVT does is vary the valve timing. Not the lift. VTEC varies the lobe profiles, affecting lift, duration, etc. They do this with an oil-actuated "pin" that locks in a follower profile. Like having 2 different camshafts. Whereas the VVT just changes the cam relation to the crank. So the timing. The profile stays identical. Now, VVTL-i is a different story, as it has the seperate profile that locks in, as well as being able to vary valve timing. Pretty awesome.

2zz FTW

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