JCM900

ok since ive had my tc i wondered if the VVT-i worked like hondas vtec, my friends prelude, the vtec kicks in at 5k, and you can hear it, same with my boys spec-v, nissans secondary valve kicks in at 5k, and you can tell too, grated they both have CAI, what im wondering is do are engines do that, if it does im guessing 4k cuz thats when i feel more pull, what do you guys think, with a CAI make me notice this beter

nauticac

you've got to be kidding me....this earns POTW fo sho'.

JCM900

hey im new here, would some one actually help

InfideL

no it's adjusting continuously doesn't "kick in"
i can see all those "vtec just kicked in yo" photos coming up...:D

JCM900

well thats what im saying, i thought is was a gradual change, but my friend spec v, you hit 5 and it completely changes

mtxblau

You're thinking of VVTL-i (variable valve timing with lift) which the tC most definitely does not have. It hit lift at 6000 rpm. The Celica GTS and the Matrix XRS (pre 2006?) had them. Toyota does not make the VVTL-i engine anymore.

Edit: Wikipedia entry on the 2ZZ-GE

Yanki01

it "might" kick in around 8-9k rpms. you might want to try that??

nauticac

JCM900

haha real funny, but yeah thats what i was talkin bout, see i have some truth here, thank you mtxblau

JCM900

ok well that ended that thought, thank you who acually help and explained it, and did not just laugh

engifineer

It does not work like VTEC. For one thing, it does not affect lift at all, only valve overlap, and it is a continuous thing, not an on/off type of change.

huafist

InfideL

*shrug* o well the old school vtec pics are better

RnB180

I dont know if this has to do with anything, but I do notice the car pulls in the 3k-5k range.
but um yea, thats about it.

yellowxhoodie

iTrader: (16)

bluexbox916

VVT-L is the same as Vtec a high rev motor to get to high RPM for maximum HP. VVT-I is not the same as VVT-L. Search for it on Youtube, you'll see and hear the difference.

Guru

VTEC and VVTLi have a variable lift setup which actually changes the camshaft profile when it "kicks in". It switches to the different lobes on the cam. VVTi is simply variable intake cam timing which advances the cam based on a duty cycle map. Like most setups it is advanced at low RPM and slowly backs off to zero as revs increase. I tweak it a bit when tuning with the Hydra usually based on where the turbo pools up. You can actually get the turbo to spool up faster and increase torque with small changes to the VVTi map so it is useful.

SquallLHeart

sorry folks.. but due to the nature of this thread...

along with the nature of you general "kind" folks of SL.. i'm closing this thread now.