Nissan 370Z Forum - VVEL control unlocked

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Yeah I read a good article a while back comparing vvel, valvetronic, and toyota's (can't remember name). A good read, but they all were a bit different. Toyota's seemed like the best approach, but that was about 30 minutes of reading on teh intarwebz, so what do I know!

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Originally Posted by djtodd (Post 1971430)

yeah i read a good article a while back comparing vvel, valvetronic, and toyota's (can't remember name). A good read, but they all were a bit different. Toyota's seemed like the best approach, but that was about 30 minutes of reading on teh intarwebz, so what do i know!

vvt-i

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Originally Posted by jpritche (Post 1971454)

vvt-i

Vtech + stickers ftw!!!

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Originally Posted by djtodd (Post 1971430)

Didn't know that Toyota had something to VVEL, but after some research it's called Valvematic. However it doesn't seem like any of the Toyotas in the US has this.

Quote:

Originally Posted by jpritche (Post 1971454)

vvt-i

VVT-I is like nissan's VTC

Bump. Anyone heard anything else on this? Gains? Dynos?

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Originally Posted by gabe3d (Post 1974245)

Didn't know that Toyota had something to VVEL, but after some research it's called Valvematic. However it doesn't seem like any of the Toyotas in the US has this.

VVT-I is like nissan's VTC

I think VVT-I is more like VVEL...

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Automakers have addressed this concern with something called "variable valve timing" (VVT). The Toyota Tundra's i-Force 5.7L V8, Toyota's newest VVT-i engine, has the ability to vary the timing of the valves in relation to engine speed. It does this by using engine oil pressure to move the camshaft slightly, so that more aggressive lobe designs are used when the engine is running at a higher rpm. By doing this, the i-Force V8 is able to run a camshaft profile that provides good fuel efficiency in every day driving, but is still able to churn out gobs of power when the pedal is pressed to the floor.

The dual VVT-i in the Tundra takes things a step further by allowing the exhaust and intake valves to open at the same time at very high RPMs in order to scavenge the airflow as much as possible. This all adds up to a V8 engine that produces 381 horsepower at 5600 rpm while still generating 401 lb-ft of torque at as low as 3600 rpm. Not only that, but in the 2 wheel drive models, the Tundra gets a respectable 20 miles per gallon on the highway. Perhaps most importantly, Toyota's variable valve timing system lets you have killer horsepower without getting killed at the gas pump.

So was it really unlocked or is it just a myth?

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Originally Posted by Z370Z011 (Post 1986270)

So was it really unlocked or is it just a myth?

There have been several claims/rumors, but no actual evidence or fact that has been available for the masses.

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Originally Posted by XwChriswX (Post 1986234)

I think VVT-I is more like VVEL...

VVT-i is Toyota's version of Honda's Vtec. The method of operation described is identical to Honda's Vtec. fwiw I did an internship at Honda's engine plant so I have a pretty in depth understanding of Vtec.

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Originally Posted by gomer_110 (Post 1986293)

VVT-i is Toyota's version of Honda's Vtec. The method of operation described is identical to Honda's Vtec. fwiw I did an internship at Honda's engine plant so I have a pretty in depth understanding of Vtec.

VVT-i does not adjust lift or duration, while VTEC does.

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Originally Posted by XwChriswX (Post 1986234)

I think VVT-I is more like VVEL...

The description you showed is correct, which is not the equivalent of VVEL because of the reasoned mentioned by red__zed.

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Originally Posted by gabe3d (Post 1986394)

The description you showed is correct, which is not the equivalent of VVEL because of the reasoned mentioned by red__zed.

Precisely the point it's only VVT-i, no "L" nomenclature.

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Originally Posted by XwChriswX (Post 1986405)

Precisely the point it's only VVT-i, no "L" nomenclature.

Although there is a VVTLi engine -- the 2ZZ. However, it could only adjust lift between two positions -- a high one and a low one.

Quote:

Originally Posted by XwChriswX (Post 1986405)

Precisely the point it's only VVT-i, no "L" nomenclature.

Not sure what you mean since you mentioned this before in response to the statement i made that VVT-I is more like VTC rather than VVEL.

Quote:

Originally Posted by XwChriswX (Post 1986234)

I think VVT-I is more like VVEL...

in other news, who gives a ****