Hyperblade Posted June 18, 2020 Report Share Posted June 18, 2020 In the Manual for setting up a K20a it mentions "Extra relay required as from the factory the VTEC solenoid is wires as power (+) switching Can this be changed to do ground switching via the ECU in a custom loom? Just trying to limit the number of relays i'm using. Quote Link to comment Share on other sites More sharing options...
Adamw Posted June 18, 2020 Report Share Posted June 18, 2020 If its a two wire solenoid then yes you should be fine to connect +12V constant to one side and lowside drive the other side directly with an Aux. I suspect the note in the help file was probably based on using the factory loom which has one side of the solenoid permanently grounded. Hyperblade 1 Quote Link to comment Share on other sites More sharing options...
Hyperblade Posted June 18, 2020 Author Report Share Posted June 18, 2020 33 minutes ago, Adamw said: If its a two wire solenoid then yes you should be fine to connect +12V constant to one side and lowside drive the other side directly with an Aux. I suspect the note in the help file was probably based on using the factory loom which has one side of the solenoid permanently grounded. Thanks, I figured as much but was wondering if i had missed something special about them Quote Link to comment Share on other sites More sharing options...
[email protected] Posted June 19, 2020 Report Share Posted June 19, 2020 Even if we use the factory room. It should be fine with high side drive as I understand that the VTEC solenoid is considered low resistant load, Is this correct? Quote Link to comment Share on other sites More sharing options...
Adamw Posted June 19, 2020 Report Share Posted June 19, 2020 2 hours ago, [email protected] said: Even if we use the factory room. It should be fine with high side drive as I understand that the VTEC solenoid is considered low resistant load, Is this correct? I dont know. Only some of our ECU's have high-side drives (not Atom, Monsoon or plug-ins), those that do are capable of 0.5A highside. I dont know what those solenoids require, but assuming their resistance is more than about 30ohms you should be ok to highside drive. Quote Link to comment Share on other sites More sharing options...
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