Pierburg CWA400 pump

[Paul Proefrock]

Does anyone know the BMW (or other mfg's) models that used the Pierburg CWA400 and if it was controlled by PWM, LIN or some other variant by BMW?

Seems Pierburg has thrown some wrenches into our sandbox.

1) The CWA400 no longer is controllable by PWM, since March, 2024. You can add a control adapter to convert PWM to LIN but that adds a few hundred dollars and more components and complexity to a build.

2) Pierburg is now offering a CWA400PWM but on close inspection, it appears to be based on the older CWA200 product and castings and the outlet is not clockable by modifying a notch. It is the three-bolt retainer version like the 200. To fit our toys, being able to clock the outlet is very desirable.

I can't imagine Pierburg turning away business for the older BMW, Mercedes, LandRover and others. But I don't know which models may have used the Pierburg CWA400 with PWM control. I am hoping by using a vehicle model or part number, I can find one of the older units on the shelf somewhere.

Anyone know the BMW line and which models I should be looking at?

Thanks

Paul

 

[Ken Roberts]

Here is the Pierburg CWA400 Tecomotive was previously selling (pwm). This is the non clockable version.

 

[Paul Hendrickx]

Tecomotive Store

tecomotive.com

 

[Paul Proefrock]

A little more research I learn the BMWs use the LIN bus, even back on the old models. The PMW feature that was deleted has no effect on the replacement market, it only impacts us 'hotrodders'. I'm hoping Pierburg will tell me the model or revision number that I can identify an older pump that still has the PWM circuitry. I want the newer 'clockable' output with the older PWM electronics. It will have to be a pump that has sat in inventory since late 2023 till about Jan/Feb of this year.

 

[Ryan L]

Is this the electric water pump?
I think that first surfaced on the BMW E60 (e6x) 5 series sedan as part of the deployment of the N52 six-cylinder engine (2005 at a guess). It was latter made available across the BMW product range. In everything from X1, X3, X5, 3 series, 1 series ect. Not sure if it made it onto the 4 cylinder version of the engine and was available on things like a mini

you can try searching "realOEM" to locate the part numbers for model specific parts. You might need to find a VIN number of a vehicle that is being advertised for sale to determine what vehicles had what.

I suspect an early E60 530i will be the first iteration of the pump.

 

[Randy Folsom]

A little more research I learn the BMWs use the LIN bus, even back on the old models. The PMW feature that was deleted has no effect on the replacement market, it only impacts us 'hotrodders'. I'm hoping Pierburg will tell me the model or revision number that I can identify an older pump that still has the PWM circuitry. I want the newer 'clockable' output with the older PWM electronics. It will have to be a pump that has sat in inventory since late 2023 till about Jan/Feb of this year.

I can’t find a way to mount the non-clockable Pierburg gracefully. One of the complications with the non-clockable version is that the electrical connector sticks out about 2” and is rotated about 95 degrees from the outlet. If mounted up front, the coolant lines are going to need some pretty sharp bends and the nostril(s) will probably need some modifications.