I don't know...

From the wikipedia link....

"When the engine is operating below 6000 rpm, the low lobe is operating the rocker arm and thus the valves. When the engine is operating above 6000 rpm, the ECU activates an oil pressure switch which pushes a sliding pin under the slipper follower on each rocker arm. This in effect, switches to the high lobe causing high lift and longer duration."

But they're actually referring to the 2ZZGE engine.

 

yes, they are talking about the 2ZZ with had LIFT [vvt-li]. The tC doesnt have lift. Therefore no switch in cams.

the tC has vvt-i, where there is no change in cam settings under a certain RPM.

 

Thanks for clarifying!

 

I do understand that. I do feel more pull after 4K but there is like a 'bump' in the rev range. It's not like VTEC. It's very smooth and then bump and then continues on. The engine speed doesnt just zing up...... just..... continues on, sorry for the lack of better terminology.

 

yup, definitely vvt-i != VTAK

 

I feel I'm talking to the wall here. The notch that I'm talking about doesn't occur under hard acceleration or above 3000 rpm. It occurs under 3000rpm and using moderate throttle.

I guess I just have to post the actual rpm for you guys to try it on your own cars.

 

Thank you chris...

if anyone says its vvt-i "kicking in" imma e-slap you!

 

No, I know what you're talking about. Once you go over 2k, which is the proper range for our engines, it starts responding well. Once you go over about 3.5k-4k, it really wakes up and lets you know whats its made of.

 

o man i wish i had a good microphone to record it, because on my car it's so distinct. ill try a camera to record it even tho sound q isnt that great.

 

^is the window open when you hear this?

 

Powerband. It happens in every gear except first.

If you start your car in second gear, you won't have any power untill you get up to the RPM's the gear has its power in. There isn't a "VTEC" like response.

Since the tC makes "peak" torque at 4000 RPMs, it starts to pull harder around 3000 RPMs, which is what you're noticing.

 

its distinct either way, windows up or down

 

the 2zzge has variable timing AND lift, lift isnt a feature we have so i dont think its as relevant.

GUYS i recorded a sound clip since its distinct in my car, i capped the intake resonator/silencer and i have an open airbox. everything else is stock. keep in mind that the throttle position is completely constant when i accelerated in 2nd gear. i used L and 2 gears so you know when it was shifted into 2nd.

YOUTUBE LINK:
http://www.youtube.com/watch?v=HftOBpXH8ks
and notice the changing of engine tone for a half second period. does not sound like this in 1st gear or neutral either.

give it like 20 minutes to process i just uploaded it right now

 

yup... that's just the engine coming to life

you're shifting your auto?

 

and who said that?
Some of you might think we're crazy for having this feeling about the car. But it is what it is. So say VTAK all you want.
The feeling is more like there is something wrong more than any "kick in". It kind of feels like a carb car with bad timing or like a newer WRX with the open loop-close loop problem.... but not to that extreme.

 

yep for distinguishing purpouses

 

this video still doesn't convince me that something other than hitting peak torque is going on

[shrugs]

 

Ok, in that case, I'll post a video too in addition to posting the rpm.

 

I'm not saying there's a definite difference, or that you said it was (because I know you didn't), its just that I see time and time again in different threads people talking about VVT-i as if it is some type of VTEC, which as most of us here know, it isn't.

 

yes, I do agree that one of the 1st things new owners do wonder about is VVT-i and if it is related to VTEC. I currently still have a VTEC car in the house so I think I can tell the difference
Well, as I stated before, it feels more like something is wrong...... especially on 1st gear accelerations.