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

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.

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.

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

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.

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

Is there anyway to mimic how the Davies Craig digital controller works? http://www.daviescraig.com.au/media/132 ... .07.16.pdf

Not directly from the ECU, no

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

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.