1uz/3uz vvti mechanism description & pics

[MWP]

Most standalones cannot control the mechanism correctly other than a 5v on and off signal. to control the actuator as OEM it is requred that your computer be able to vary the input voltage to accurately control cam timing phasing degree by degree.

You sure?

The solenoid controlling the oil flow should be 12V and controlled by PWM, not variable voltage.

 

[rivmasta]

Based on my exp with EMS ECU's (I assume others are the same) outputs are negative, therefore those outputs are used to control relays to switch the VVT mech on or off... so they're all 12v.

Interesting that the mech on both is the same and controlled by power input though... means that all those offroaders running Motec, EMS etc would be better off with the stock ECU I guess.

 

[Brad Bedell]

The solenoid controlling the oil flow should be 12V and controlled by PWM, not variable voltage.

What he said...

 

[BARRY]

sorry, i was incorrect its 12v on and off, you guys are right. also was incorrect on the blacktop 20v. it has VVT not VVT-i. it just has a better computer control for the parameters of opperations than the silvertop 20v does.

how would you go about controlling VVT-i then? I know the majority of computers out there cannot vary their voltage or at least have the option to control VVT-i type functions.

 

[ed_ma61]

motec and autronic sm4 can do full variable PWM vvti control

 

[turboandrew]

As does the AEM EMS (PWN vvti control). You have to set the proper frequency for the PWM and also use extra timing inputs to allow closed loop control of the cam timing. Then you have to build a rpm vs load map with timing advance/retard targets.

FWIW, AEM has both "highside & lowside" (12v+ and 12v-) outputs as well for things like fuel pump relays, N2O, etc.

 

[BARRY]

AEM is sooo time consuming to configure. that is the only reason i hate it! my haltech is soo easy to get up and running compared to AEM.

autronic looks easy as well.