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Steve Bull

EWP control on xtreme

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Has anyone managed to mimic a Davies Craig EWP controller without using loads of aux outputs. Is it best to keep a thermostat. I have removed the one from my 1uz engine but do have a spare inline one. 

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I think you might struggle with a G4.  Attached is a G4+ map that I set up to operate similar to the davis craig controller for someone else before.  It may give you some ideas.  It uses a timer and 3 virtual auxes.

From memory it pulses the water pump on for 1/2 a second once every 4 seconds during warm up, once water is above 50°C it pulses on for 2sec every 4 sec, then above 90° it runs full time.

Elec water pump cycle.pclr

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Can the dual half bridge outputs be combined to run the pump?  Davies Craig says 10A for the EWP130, but the documentation for the G4+ Thunder says max 8A on PWM output.

 

 

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15 hours ago, Grant Baker said:

Do you think this one will work ok?

https://uk.rs-online.com/web/p/solid-state-relays/4914947/

And, do you need a pull-up resistor?

I notice Haltech supply one with the relay they sell...

https://www.haltech.com/product/ht-030202-solid-state-relay-100-amp/

that's what we use Grant , think that the relay you need to run resistor across the 2 wires controlling the relay;  Adam did a good reply regards the resistor set up across some solid state relays sometime ago.

Also the guys at Devils Own list a cheap solid state relay but I havent looked at specs  http://www.methanol-injection.co.uk/index.php?route=product/product&path=27&product_id=229

The Hella you can buy cheaper  as well , no data if it needs a resistor fitted thou

Also you need to work out what minimum on voltage is , some wont work below 3v so they may only work for 30% PWM output

 

 

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The RS one you linked to is only for switching AC so that wont work.  Look for the equivalent but DC on the output side.

You dont need a pull-up resistor, the Haltech ECU's dont have a pull-up on their aux outputs whereas the Link does.  

Most of these industrial SSR's arent designed to PWM inductive loads so I think you may need to grossly oversize it (notice the Haltech one is 100A) for reliability and you cant PWM them very fast, about 100Hz or so.

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Not really, I've used the hella one a few times for fuel pumps on race cars with slow/small alternators but only smallish pumps at about 10A.  They are rated for 22A, but a few other guys on here that tried them with higher loads said they overheat and reduce output after a short time.

In the Megasquirt world the Dorman 902-303 (jeep) or Dorman 902-310 (dodge) are common and are meant to do up to 40A PWM.  Never used one personally however.

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