James Wingfield Posted October 27, 2009 Report Share Posted October 27, 2009 I'm not planning to use it just yet but am setting up a ban of relays for various outputs and want to know if I should provision one for my WI pump. I'm planning to use Aux3 for a pwm output but I don't know if i can drive the pump directly from the ecu (+122 to the pump and then earthe directly through Aux3) or if I should use a rela. I'm not even sure if a relay is suitable to use with a pwm output or if that will kill the relay? Does anyone know? Thanks, James Quote Link to comment Share on other sites More sharing options...
Guest Dave Posted November 1, 2009 Report Share Posted November 1, 2009 what type of water injection are you planing on using as well as what pump if you are going to use the pump as a pwm then you will need a solid state relay you will find you have better control if you turn the pump on and let it build pressure then use a solenoid to inject the water that is controlled of a 3d pwm map Regards Dave [email protected] Quote Link to comment Share on other sites More sharing options...
James Wingfield Posted November 8, 2009 Author Report Share Posted November 8, 2009 I'm hoping to run the pump full time and then use a solonoid as you suggest. I haven't got the valves needed to do that yet though. Assuming I get those then I guess it will be no different to driving a boost solonoid would it? Hence power the solonoid and earth it directly through the ECU. James Quote Link to comment Share on other sites More sharing options...
James Wingfield Posted November 8, 2009 Author Report Share Posted November 8, 2009 On second thoughts - I might want to control the pump with a PWM signal as well as the solonoid. Why would I need a solid state relay? James Quote Link to comment Share on other sites More sharing options...
Guest Dave Posted November 9, 2009 Report Share Posted November 9, 2009 the ecu is not capable of the current draw that most pumps will require hench you will need either a solid stae relay or a mosfet driver to pwm the pump or a normal relay if you want to just switch it on Regards Dave [email protected] Quote Link to comment Share on other sites More sharing options...
James Wingfield Posted November 10, 2009 Author Report Share Posted November 10, 2009 ok thanks. I'll look into mosfet drivers and/or solid state relays if i do go down that route. James Quote Link to comment Share on other sites More sharing options...
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