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 Post subject: S40 Driving Electric Water Pump using AUX2 PWM
PostPosted: Tue Jan 09, 2018 4:34 am 
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Joined: Tue Sep 20, 2016 4:47 am
Posts: 24
Location: Ardeche, France
ECU Model: S60 Pro
Distributor: xap
Firmware Version: 61
Hi All,
I need some help can you confirm I am right ?
I want to drive my Davies Craig EWP115 using DTA S40 AUX2 PWM output connected to an HELLA Solid State Relay (4RA 007 865-031) to drive the Pump Speed according to coolant temp.
Some guys seems to run the PWM at 100Hz to drive these pumps.
is the following configuration correct ?
I don't want the pump to run when engine is stopped and i do not want to alter any fueling or ignition.
Attachment:
water pump.png
water pump.png [ 33.88 KiB | Viewed 2597 times ]

I have seen guys running fuel pumps using this relay :
https://www.youtube.com/watch?v=JXunwRDo8OA


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 Post subject: Re: S40 Driving Electric Water Pump using AUX2 PWM
PostPosted: Tue Jan 09, 2018 4:51 am 
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Joined: Fri Feb 28, 2014 1:03 pm
Posts: 1139
ECU Model: S40 Pro
Distributor: DTA
Firmware Version: 79
That looks fine.
However, a few people have had issues with cavitation running those pumps at 100%.
I would try a maximum of 90% and see how you get on. Then increase it until the temperature rises faster with higher PWM, indicating cavitation is occurring.


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 Post subject: Re: S40 Driving Electric Water Pump using AUX2 PWM
PostPosted: Tue Jan 09, 2018 5:05 am 
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Joined: Tue Sep 20, 2016 4:47 am
Posts: 24
Location: Ardeche, France
ECU Model: S60 Pro
Distributor: xap
Firmware Version: 61
We were running the pump using a simple relay activated by the ECU once the engine was running (using AUX6) but the temp would only reach 60°C.
To be able to run the car in our home event (Rally) we have cuted the pump if the temp wents below 70°C but we all know it is not good for the engine so now that we have the time we will make things better and I don't think we will need to run it over 90%.
thanks again for your help.


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 Post subject: Re: S40 Driving Electric Water Pump using AUX2 PWM
PostPosted: Tue Feb 06, 2018 10:03 am 
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Joined: Tue Sep 06, 2011 7:13 am
Posts: 22
ECU Model: S60 Pro
Firmware Version: 78
I use a similar way but activate it by rpm
as the rpm increases so does the duty

800rpm @ 25% to 2500rpm @ 100% i dont seem to get any cavitation on my setup and i also run an 82 degree thermostat so it never overcools .

Ive also got a booster pump aswell that would come in at 95 deg and go off at 90 deg


John


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 Post subject: Re: S40 Driving Electric Water Pump using AUX2 PWM
PostPosted: Mon Feb 12, 2018 8:03 am 
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Joined: Tue Sep 20, 2016 4:47 am
Posts: 24
Location: Ardeche, France
ECU Model: S60 Pro
Distributor: xap
Firmware Version: 61
in fact even running the pump at 10% while the car is Rolling with lets say 5°C outside air temp the coolant temp will barely reach 55°C.
I think the radiator and the pump are too big for the engine.
by putting a plate in front of one quarter of the radiator the coolant temperature is running between 77°C up to 86°C when the fan starts.


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 Post subject: Re: S40 Driving Electric Water Pump using AUX2 PWM
PostPosted: Wed Feb 14, 2018 3:51 pm 
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Joined: Tue Sep 06, 2011 7:13 am
Posts: 22
ECU Model: S60 Pro
Firmware Version: 78
You need to put a low temperature thermostat in there then to get it at the temperature you want to run. Then when it opens the temperature will be quite stable

If you run a 74 deg thermostat by the time it gets to 84 deg it will be fully open so easier for the pump to keep the temperature down when the fans come on


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 Post subject: Re: S40 Driving Electric Water Pump using AUX2 PWM
PostPosted: Mon Feb 19, 2018 8:17 pm 
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Joined: Mon Feb 19, 2018 7:45 pm
Posts: 4
ECU Model: S60 Pro
Firmware Version: 58
Is there anyway to mimic how the Davies Craig digital controller works?
Attachment:
IMG_1616.PNG
IMG_1616.PNG [ 414.99 KiB | Viewed 2321 times ]


http://www.daviescraig.com.au/media/1320/1484524180.18922-LCDEWPFANDigitalController-PN800012.07.16.pdf


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 Post subject: Re: S40 Driving Electric Water Pump using AUX2 PWM
PostPosted: Tue Feb 20, 2018 8:49 am 
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Joined: Fri Feb 28, 2014 1:03 pm
Posts: 1139
ECU Model: S40 Pro
Distributor: DTA
Firmware Version: 79
Not directly from the ECU, no


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 Post subject: Re: S40 Driving Electric Water Pump using AUX2 PWM
PostPosted: Mon Apr 09, 2018 5:10 pm 
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Joined: Tue Jan 16, 2018 9:38 am
Posts: 54
Location: Aberdeen
ECU Model: S100 Pro
Distributor: DTA
To revive this thread - I've wired up a EBP40 water pump on a bike engine I'm wiring for an S100.
Using a similar SSR (DC type) and Aux2 in PWM mode against water temp.

Is there a simple way in the software that I can test this is working without the engine running? All wiring is in place, and I'd just like to test it and ensure the pump runs.

Doh - writing this I realise I can just ground the input pin on the SSR to test - but it would still be neat if I could test it via the software.....warming up the temp sensor to see the pump increase duty cycle.

Cheers
Steve


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 Post subject: Re: S40 Driving Electric Water Pump using AUX2 PWM
PostPosted: Tue Apr 10, 2018 2:36 am 
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Joined: Fri Feb 28, 2014 1:03 pm
Posts: 1139
ECU Model: S40 Pro
Distributor: DTA
Firmware Version: 79
You can - Display and Test Functions -> Test Injectors, Coils and Auxiliaries.
You can turn on the output you want to test from there. It won't be PWM though, simple on/off.


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