Welwynnick

The Pierburg pumps seem to pull a bit less current than you might expect.

Current draw generally increases with increasing flow, but not in proportion, it increases more slowly.

The CWA 100 runs about 6 amps and the 50 about half that. Can't remember what the 200 ran at - it might be in my charge cooling thread.

Pretty sure all the Pierburg pumps run with DC into PWM.

Nick

austingtir

Yep the cwa 100 only draws around 6-6.5amps in the stock intercooler and heat exchanger circuit. I posted pics of my amp meter connected in the circuit at one stage but must of been in another thread. Im even using the stock wiring. The talk of needing a relay and all that is rubbish imo.

MACEDON

So just wire this pump into the stock wiring for the intercooler pump?

How do I get it to be always on this way?

Punisher10mm

+1

Welwynnick

Connect battery to +12V
Connect ignition to PWM
Connect ground to ground.

Nick

MACEDON

Are you referring to: connecting the stock pump wire to the cwa100 plug pin out

or

are you saying to connect the pump to any 12v source, then do the rest?

Because if it's the second option, that's the hard part that I don't know how exactly. Especially what the hell is PWM...

MACEDON

About to wire this pump to the stock plug on the car, gonna cut it, use crimped joiners to join the wires to the pigtail from tecomotive.

Any objections?

B Feelgood

Pretty sure that stock wiring is too thin to support the current draw of the 100.2, especially if you're going to have it running constantly with key on.

I always create a ground close to the pump location and run a new heavier gauge wire to an empty slot in the passenger side SAM (SL55). This allows the pump to run constantly with key on and adds safety insurance with heavier gauge wire.

StarvingArtist

Crimped connectors tend to corrode and fail. It would be better to solder it in with shrink tube to cover.

MACEDON

Good point, that is the proper solution.

Just wondering if someone's done it this way other than pmercurry who claims to have run his pump for a year this way.

drothgeb

I have crimped connections all over, meth pump power, solid power, wideband power. Depending on what I want where I'll use crimped on bullet connectors if I think it would be convenient to disconnect easily. I solder all control signal type connections like taps into sensors or RPM signal or anything like that but that's pretty much it.

Been doing it that way on several vehicles for the last 10ish years and I have not had any failed electrical due to the crimp on connectors of any type(knock on wood)

MACEDON

Now let's hope I don't fry the stock wiring

austingtir

Mines been wired through the stock wiring for a couple years. Soldered connections. I tested the amp draw its probably in this thread actually. Mine was drawing like 7amps or something.

I was fairly satisfied the wiring was fine.

MACEDON

I can't get this **** to run.

I have pin 3 and pin 4 together on + from bosch wiring

and pin 1 to negative from bosch wiring

what the **** is the problem I don't understand

Dale Andersen

Good morning! I have been trying to research Pierburg pumps - specifically the CWA400.
You said you were an engineer for Pierburg - AND you invited inquiries - what good luck!
My specific application is not MBZ, but Honda.
I want to use a CWA400 to replace the standard engine driven coolant pump on a 4 cyl K24 engine that will (eventually) be supercharged. The target is 500 to 550 hp with good torque.
I recently discovered the Techomotive tinyCWA Controller, and that looks like just the thing I need.
Do you have any thoughts or other wisdom to impart?

I welcome your comments -

Dale Andersen

Welwynnick

The CWA400 and Tecomotive controller may be just what you want, but here are some comments.

The CWA400 is designed for engines around 2-300 bhp, so you may be pushing the capacity of the pump.

One option to increase capacity may be to delete the engine thermostat - they tend to restrict the flow somewhat, and the thermostatic control of pump may be all you need.

This thread is about charge cooling, so I would research your option to see if other people have done this successfully.

Installing a cooling pump isn't a trivial matter. You need to be aware of various installation considerations to maintain safety and reliability and to avoid air locking.

Tecomotive are very helpful and will probably give good advice.

They developed a controller specifically for charge cooling applications for me when I asked them a few years ago, so they're flexible & supportive.

Nick

sunnybenz45

How do I connect this pump, will it plug and play? Also, do I need to upgrade any other cooling parts? HE, etc.

macarena78

i have a jhonson c30 pump and i bought this pierburg cwa100 pump, but my car (e55 amg w211) only runs it to 100%.
this pump runs maximum until 85% and it stops when is in my e55 because it only runs it at 100%.
how can i configure it and install it on my e55 amg w211 please¿?
thanks
regards

SICAMG

What is emergency mode ?
You say it runs at 100%
You say it runs at 85%
You say it stops because it only runs at 100%

I am really lost with this one. Give a bit more accurate information so we can help.

boosted305

This post was pure GOLD for me thank you very much...really made the process easier with the part numbers and all...my pump died and I ordered a Pierburg CWA 100 from FCP Euro. When I got it I noticed that the plug was different than the one I had in the car. Quick research on here yielded this post which was a lifesaver.

However I will say, that on the plug that I received, the #4 pin was on the opposite side of where yours is, ie where your black wire is, is where my red wire is...I was initially confused because your instructions were that the #4 pin was power, yet in your pic you have a black wire in the slot where the #4 pin is on my plug...

I tested the pump with a 12 volt battery and a couple of test wires and confirmed that the #4 pin on the pump was the power (which looking down into the pins of the pump is the pin all the way to the right)...I can only assume that the pump I have being newer, perhaps they swapped the power pin to the opposite side of the pump you had.

Regardless I can't thank you enough for making this as painless as possible.

boosted305

Just installed a CWA 100 last night and ran power direct from fuse box to run the pump constant. Took it for a test drive and no issues...so far (knock on wood)...IAT's recover well after hard pulls and, in fact, overall IAT's were consistently around 1-3 degrees colder than they were with the upgraded pump I had in there previously.

So far so good.

Frank Barrett

Remember, guys, that a higher flow rate isn't necessarily a good thing. It has to be balanced with the radiator or intercooler's heat-transfer ability. If you push coolant too fast through the radiator, it may not cool well enough. Test it.

No2fast

2 x Pierburg CWA50 pumps in series + under the car cooler German Autobahn

No2fast

I don`t think so. low pressure high volume is a good thing.
most of the guys here installing a secondary radiator in front of the stock radiator, condensor. thats the main reason for poor cooling (heat soaking).

https://www.crossfireforum.org/forum...-autobahn.html

Steven
Berlin Germany

Welwynnick

This is a common miss-apprehension on the internet, but is almost completely wrong.

In practice, more flow always gives more cooling, it's just that you get diminishing returns pretty quickly.

The most important things are to match the pump characteristics to the system requirements, and to make sure you keep all the air out.

It's discussed several times in the charge cooling thread linked in sig.

Nick