st170 VVT help

[matt311]

I have an st170 zetec engine ready to fit into my mk1 fiesta which has a standard 1.8 zetec at the moment, running with a microsquirt v3 controller.
Can someone explain how to run the VVT from my ECU?
thanks
Matt

[grom_e30]

according to google the vvt on a st170 is a simple on off type set up kicks in at about 3000rpm. you should be able to use the programmable output to switch the vvt on at your desired rpm.

http://www.msextra.com/doc/pdf/html/Meg ... e-3.4.html
see section 13.10 on/off outputs.

in terms of hardware do you know the current draw of the solenoid? and do you know if it expects a low side (ground) or a high side (12v) to activate it?

[matt311]

according to google the vvt on a st170 is a simple on off type set up kicks in at about 3000rpm. you should be able to use the programmable output to switch the vvt on at your desired rpm.

http://www.msextra.com/doc/pdf/html/Meg ... e-3.4.html
see section 13.10 on/off outputs.

in terms of hardware do you know the current draw of the solenoid? and do you know if it expects a low side (ground) or a high side (12v) to activate it?

thanks for your response, the solenoid takes a 12v feed to activate it.

[grom_e30]

a solid state relay may be your best plan.

[matt311]

a solid state relay may be your best plan.

just have a relay that will feed the 12v when i want the VVT to cut in and out?

[grom_e30]

pretty much the ecu will turn the relay on and off based from your chosen rpm supplying the 12v needed for the vvt to activate. a solid state relay may be the best option though as it turns on and off quicker than a normal and has no mechanical moving parts to wear out.

[matt311]

pretty much the ecu will turn the relay on and off based from your chosen rpm supplying the 12v needed for the vvt to activate. a solid state relay may be the best option though as it turns on and off quicker than a normal and has no mechanical moving parts to wear out.

oh okay thats sound! Then after that it is just adjusting the degree increase through the rev range?

[grom_e30]

it looks like its just a simple on/off for your engine so below 3000 rpm vvt is off, and above that its on.