CWA100 Pump Upgrade

Original by BHVRDR

I have finally gotten around to writing on this topic after people have shown interest. I want to thank Tecomotive.com for making the specsspecifications of these pumps so readily available to us all.available. The data they provide is available from PierburgPierburg, but tecomotiveTecomotive graciously makes this information easy to find and decipher on their site. They also makeoffer wiring harnessesharnesses. available.For Alsomore information on these pumps, please see this threadthread: for a ton of info about these pumps:
https://mbworld.org/forums/w211-amg/...now-about.html

What is the CWA100?

The stock supercharger coolant recirculation pump in our car is an extremely robust and powerful flowing pump, particularlyespecially atwhen flowing against head pressure. The stock pump is a Pierburg CW50.

That said asAs people add additional heat exchangers, killer chillers, or additionalincreased boostboost, tgeythey may want increasedimproved circulation.

Here are the specsspecifications of the stock Pierburg CWA50 and CWA100:

As you can seesee, the CWA100 almost doubles the flow of the CWA50. LookingAccording atto the technical documents, it also massivelysignificantly outflowsoutperforms the hobby hobby-style pumps such as the Varimax and Meziere style pumps when any head pressure is seen.


encountered.

CWA100-2 versus CWA100-3

There are three different versions of the CWA100 pump, but we will focus on the currently available versions, the CWA100-2 and the CWA100-3.

First itAccording should be known that as far asto the specifications suggests,specifications, there are no flow differences at all between these pumps.pumps; Theythey should both work identically. The only differencedifferences appearsare toas befollows:

in

the
• The following:
  
  CWA 100-CWA100-3 has slightly shorter water inlets and outlets.
  
  
• The connectors on the CWA100-2 and CWA100-3 are different.
  
  

I have had both of these pumps.

Here is the connector/socket for the CWA100-2:

Here is the connector/socket of the CWA100-3:

Availability of the CWA100 variants:Variants:

-The

• CWA100-22: This is an old AMG pump that was used in amany ton of Mercedes Mercedes-Benz supercharged applications. The Mercedes Mercedes-Benz part number is: A0005000486
  
  A0005000486. You can source this part from a multitude ofmany MB dealerships as a remanufactured item in the $300 to $350 range. FCP Euro currently has it currently for $342 and of course that is342, with a lifetime warranty. Tecomotive also has thisit available for 249Euro249 Euros, and you can buy the plug and plug-and-play connector from them. They are a great site to support as wellsupport, as they have been kind enough to publishpublished most of the research you see here.
  
  -The
• CWA100-33: This is a new VAG pump that is used overseas in the Audi Q7 4M hybrid.hybrid overseas. The VAG part number is: 4N0965567
  
  Interestingly4N0965567. Interestingly, you can find this pump from salvage cars on ebayeBay for around $75. HOP ON THIS WHILE YOU CAN!
  
  
  
  
  

Harnesses for eachEach of theseThese pumps?Pumps

You can easily make a harness for each of these pumps.

Here are the part numbers needed for the CWA100-22:

• Connector to the CWA10-2 Pump: BMW part number: 12527549033 (available at ecstuningECStuning or fcpFCP for under $5)
  
• Connector to the stock harness: TE Connectivity p/n 1-1703494-1 (available on arrow.com for $1.69)
  
  

Here are the part numbers needed for the CWA100-33:

• Connector to the CWA100-3 Pump: VAG part number: 4D0971993 (ebayavailable on eBay for around $8)
  
• Connector to the stock harness: TE Connectivity p/n 1-1703494-1 (available on arrow.com for $1.69)
  
  

You should be able to make either of these harnesses for around $10-$15 or less.

PIN Diagrams:

CWA50

CWA100-2

CWA100-3

You should be able to make either of these harness for around $10-$15 or less.

PIN Diagrams:

CWA50

CWA100-2

CWA100-3