Technical > Wiring & Sensors

sr20det nvvt

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ex-ctr:
can the vems be used to trigger the solenoid for the vvt

rob@vems.co.uk:
Yes, perhaps not exactly as the OEM system as I think some of it is speed related.
The solenoid can be driven from one of the spare Injection channels.  On the Nissan you'll use one to drive the IACV, one for the boost controller, which means you have two others to play with.

Triggering will be controlled using the Misc Output feature, which can be setup with the window found at: Extras->MiscOutput Settings
Where you can choose the triggering factors: Minimum & Maximum RPM, Min & Max TPS, Min & Max Manifold pressure.
So you should be able to mix and match the switching variables to swing the VVT stuff around.

dnb:
Does the solenoid require PWM to get a varying duty cycle or is it simple on/off?

If it's duty cycle then you can probably use the boost controller output (set up very carefully!!) to drive it.

rob@vems.co.uk:
Looking at the S14 workshop manual.
The ECU uses the following values:
Amount of intake air.
Engine speed.
Engine coolant temp.
Throttle opening angle.
Neutral position.

Valve control solenoid is on when:
Vehicle is running (not in neutral)
Engine coolant is 50degC or more
Engine speed is between 1050rpm and 5700rpm
Or
Engine Load is high (Use MAP input)
Engine speed is 1050rpm or less

All other times the solenoid is off.

We can't trigger based on Neutral or coolant temp, so it will have to be speed and/or MAP

ex-ctr:
i was thinking a straight on/off at 1050/5700  i think the 1050 on is for oil presure to be high

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