Toyota VVT-iE, Variable Valve Timing

[HamadHHAG]

good system

but why he says "timing" in conceit way

[StefSyros]

Its not better than vtec,just more officient,but the power and mpg gane doesnt worth it..

there are some better systems on the market,or just lighter cars..

[ADPTraining]

@StefSyros I think you've just touched on a key point: Lighter Cars.... That is the essence of raising fuel economy in the future. Using lighter materials and advancing the technology. Thanks so much for posting.

[giova2k6]

Compared with the VVT-I, how different is the VVT-Ie? I mean, here you have the electric motor to do what in the VVT-I is done by the oil pressure, so it seems easier to fit a VVT-Ie system to a non-VVT-i engine compared to the VVT-I; you don't have to drill oil passages in the head, but you just have to modify the timing sprocket and the camshaft so that you can fit the electric engine on the camshaft, then you have to program the ECU to manage the system, right?

[EngObayda]

@giova2k6 I think u r right

[Imreadingthisaloud]

@giova2k6 thats exactly what i was gona say! Surely its maybe easier/cheaper to manufacture and install, but with no real benefit to performance over the conventional system. Weird

[luckymisselala]

more shit to brake

[Waizu91]

So its basicallly like vtec just 10x better haha

[kintarben]

@Waizu91 Um not really...



[ErikAyJosE1]

i got a question the vvti ingrease horsepower or spend less gas

[ADPTraining]

@ErikAyJosE1 The VVTi changes the power curve of the gasoline engine. All gas engines operate at an optimum RPM only. It is the nature of gas engines. The VVTi shifts the optimum power curve for better gas mileage and power. Thanks for posting...

[manlymud]

@ErikAyJosE1 the thing saves you gas when not active, when you mash the gas the thing takes more gas but way more horsepower. so around 5000rpm the thing says its time to haul ass

[ADPTraining]

@MidShipCivic Thanks for posting. "The system still uses stop tabs at each range of the cam travel". This system is simpler that it looks. The motor actuator just races to keep with the CAM..... Keep posting....

[blue03r6]

you know instead of making a simple combustion engine design into a complex system of electronics and actuators that always fail on 70% of engines why not find alternative fuels?

[VladBlok28]

@blue03r6 because. alternative fuels suck

[mistameanor420]

so if the motor fails, it goes to max retardation ?

[dmertzanis]

It doesn't make sense that the motor continually rotates faster than the cam because that will continue to advance the cam until damage occurs. I think the motor only spins faster than the cam for a moment to advance the cam, then it rotates the same speed, holding the cam at an advanced position.

[nothGhost]

@dmertzanis He said (In the creepiest voice ever) that it MOMENTARILY rotates faster than engine speed. MOMENTARILY. Key word there.

[ADPTraining]

@Resi2birkin Yes, that's right. There's a stop at either side (retard and advance) to prevent the piston from hitting the valves. The idea is that the motor turns faster or slower therefore edvancing or retarding the CAM timing. Good luck.

[briansmobile1]

Imagine what kinds of cool chit we'd have developed if Tesla would have had equally brilliant business savvy by now. Electric cars would have been all that much cheaper, better, and faster than they are now.

[VMATT500C]

Sounds expensive to fix. How many fail and at what interval? This would be nice to know.

[amigos1996]

sweet !!!!!