$EE Code for electric water pump on AIR output

[steveo]

just curious, why do you want ECM control of the electric waterpump?

and if so, why not just use the fuel pump relay to trigger a second relay if you only want it on when the engine is running? (although you'd get a prime cycle, that shouldn't be a big deal...)

it's a cool project, just curious

[dzidaV8]

just curious, why do you want ECM control of the electric waterpump?

and if so, why not just use the fuel pump relay to trigger a second relay if you only want it on when the engine is running? (although you'd get a prime cycle, that shouldn't be a big deal...)

it's a cool project, just curious

Because... why not? :)

A feature to have the pump work on hot engine while it is off might get useful sometime.

[lionelhutz]

Did you ever consider PWM control and remove the thermostat? By remove, I mean disable it in the full open position or modify the pump to do the equivalent.

Then, you'd cool more than just down to the thermostat closing temperature by running the pump with the engine off.

[dzidaV8]

Did you ever consider PWM control and remove the thermostat? By remove, I mean disable it in the full open position or modify the pump to do the equivalent.

Then, you'd cool more than just down to the thermostat closing temperature by running the pump with the engine off.

I didn't think about it. Removing the thermostat is not a good idea, as the heat-up using the main circulation (through the radiator) would take much longer. The heater would also be less effective without it.
The PWM control might be useful to shorten the warm-up time, and maybe to free up a fraction of horsepower lowering PWM at WOT momentarily, but not much more. The pump in the car I'm working on consumes only around 7 amps, so almost nothing for the alternator.

The modern cars have thermostats with electric heater integrated in the viscous fluid to vary the opening and closing temperatures some. Anyway, why would you want to cool the car to temperatures lower than thermostat temp?

[lionelhutz]

The idea is that the PWM runs the pump slow during warm up. Decently implemented, a PWM pump and PWM fan will maintain a fairly constant engine temperature. Some OEM's are doing PWM instead of letting the thermostat regulate the engine temps. They probably build the system to have flow to the heater core first though using some other method.

You don't want to keep cooling your engine to thermostat temperature or even below it when it's OFF?

[dzidaV8]

If anyone else would want to use this patch, here is XDF with the code patch so it can be applied easily.
Code is tested in car and all works fine, so enjoy ;)

[el Jefe]

I would like to add this to my PCM. Too many close calls with just a toggle switch...

Is there a tutorial or guide of how to add a patch to a XDF ? I see in Tunerpro there is a 'Control + N' which allows me to create a new XDF Object with an option of a patch.

Then what?