Mini turbo water pump - CAN bus or analogue?
Discussion
Hi guys,
Not actually a Mini owner (sorry) but I'm in the middle of trying to add water cooling to a Porsche 964 Turbo project, specifically to add a water cooling circuit to the turbo (Garrett GT35R) and maybe at a later date, both wastegates (Tial MV's)
Investigating which water pump we can use, the turbo water pump for the current models looks to be perfect. Made for the job, nice and compact, comes with a bracket so plenty of options to mount it, and best of all, only £33 from BMW. (part number is 11537630368; looks to have been through quite a number of revisions)
https://www.ecstuning.com/b-genuine-mini-parts/add...
However...my wiring guy just had a thought....is this pump CAN bus controlled, like E90 BMW's for instance? Or is it an analogue unit?
I've found various images of the unit, showing 3 pins on the connection; correlating this to some Mini wiring diagrams that he has access to, shows +12v & 2x ECU connections. To my limited knowledge of CAN Bus technology, this would imply it is such with 2x signals flipping hi>lo to give a trigger response.
Can anyone knowledgeable on Mini tuning comment please?
Many thanks
Spencer.
Not actually a Mini owner (sorry) but I'm in the middle of trying to add water cooling to a Porsche 964 Turbo project, specifically to add a water cooling circuit to the turbo (Garrett GT35R) and maybe at a later date, both wastegates (Tial MV's)
Investigating which water pump we can use, the turbo water pump for the current models looks to be perfect. Made for the job, nice and compact, comes with a bracket so plenty of options to mount it, and best of all, only £33 from BMW. (part number is 11537630368; looks to have been through quite a number of revisions)
https://www.ecstuning.com/b-genuine-mini-parts/add...
However...my wiring guy just had a thought....is this pump CAN bus controlled, like E90 BMW's for instance? Or is it an analogue unit?
I've found various images of the unit, showing 3 pins on the connection; correlating this to some Mini wiring diagrams that he has access to, shows +12v & 2x ECU connections. To my limited knowledge of CAN Bus technology, this would imply it is such with 2x signals flipping hi>lo to give a trigger response.
Can anyone knowledgeable on Mini tuning comment please?
Many thanks
Spencer.
There would have to be 4 pins: 12V power, ground, CAN High, CAN Low.
Well, unless the pump was using single wire CAN...
However, single wire CAN is generally reserved for use with comfort equipment networks in cars. Due to the single wire and no shielding single wire CAN is not a good fit with hardware that resides in the engine compartment.
The 3rd pin could be a signal from a thermister which is used by the engine controller to control pump operation.
Well, unless the pump was using single wire CAN...
However, single wire CAN is generally reserved for use with comfort equipment networks in cars. Due to the single wire and no shielding single wire CAN is not a good fit with hardware that resides in the engine compartment.
The 3rd pin could be a signal from a thermister which is used by the engine controller to control pump operation.
Perfect, thank-you. I've been doing some background research in the meantime as well, and a few people had suggested that the 3rd pin is PWM control; leave it disconnected and the pump will run 100%, but as you say, hooked up to a thermistor it could be an active speed control (or conversely, pull it with a resistor/potentiometer and it'll sit at a constant <100% speed)
Cheers
S
Cheers
S
Edited by ains on Wednesday 17th January 17:12
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