"Parmas" Motor

[rob323]

To me, it sounds more likely that the problem is the engine management, than the engine. Might be cheaper to use something like Adaptronic which utilises all the factory sensor & igniters and has continuously variable control over the vvti.

I'll pm you an email conversation I had with Adaptronic recently.

[Parmas]

Originally Posted by rob323

To me, it sounds more likely that the problem is the engine management, than the engine. Might be cheaper to use something like Adaptronic which utilises all the factory sensor & igniters and has continuously variable control over the vvti.

I'll pm you an email conversation I had with Adaptronic recently.

I checked the specs of the e420c and seem that VVTi isn't mentioned but as you sent me the pm it seems it can eventually.

I am going to give the last try to the present management if tuning fails again then I have to change it to another that accepts VVTi or I have to consider removing VVTi completely like many honda removing Vtec.... will see what comes up next

[rob323]

Yes, that was why I emailed them. To make sure.
I haven't played enough with these motors to find out just where the cam sits when the vvti solenoid is unplugged but maybe that is the best way for you to do it now unless you can get the continuously variable control working.

[Bluevitz-rs]

Originally Posted by rob323

Yes, that was why I emailed them. To make sure.
I haven't played enough with these motors to find out just where the cam sits when the vvti solenoid is unplugged but maybe that is the best way for you to do it now unless you can get the continuously variable control working.

It reverts to the 0° position.

[rob323]

So does the vvti just retard the cam, or advance it?

[Parmas]

Originally Posted by rob323

So does the vvti just retard the cam, or advance it?

The VVTi retard and advance the camshaft angle based on the engine:

- RPM
- Temperature
- Load

If you see the image below you can notice that the camshaft is being advanced or retarding according these factors. Although there are six diagrams of camshaft angles, three of them are matched with others. I marked them for you to understand with ease.

It is hard to notice correctly if the overlaps are the same but if you see accurately, the camshaft angle figures are labeled with a 7-digit number. Some of them are actually the same label so it makes me think that infact they are at the same position.

So lets make a summary of this:

Camshaft Angle 1 - Fully Retarded

During idling \ Light Load (1a) = At Low Temperature (1b) = Upon Starting \ Stopping Engine (1c)

Camshaft Angle 2 - Fully Advanced

At medium Load (2a) = In low to Medium Speed Range with Heavy Load (2b)

Camshaft Angle 3 - Retarded but more advanced than Angle 1

In High Speed Range with Heavy Load


Still.... if you notice the 2nd and 3rd diagrams you will notice that the valve has only two ports and not three, which I am thinking are Angles 1 and 2. So that makes me think, where would the valve be at Angle 3?

[Yaris Hilton]

Got a link to that 1NZFE Spec Details.pdf document?