The CWA100 upgraded supercharge coolant pump thread...everything CWA100...

[Waffles_s4]

Ive run the oem pump at 100% on three cars. Never had an issue but cant say if you will. The whole point of the cw100 though is that it provides more flow than the cw50.

Mike

I agree with you. Though I would think running it at 100% (5800 RPM) would still be a lot better than the current OEM rate of 2900 RPM. That alone should make a big difference. Plus the used stock pump is a lot cheaper used.

[Waffles_s4]

You missed my point - you're correct comparing a CWA50 to itself in emergency mode, a CWA100 in regular PWM mode still outflows the CWA50 in emergency mode.

Depends on what rate is considered normal for the CWA100 (by default). If its normal is 100% full speed, you are absolutely right. But say the normal was i dunno, 50%, then the stock pump at 100% could actually be ahead in terms of liters per hours pumped. They both have the same opening, which means the CWA100 consumes more power (in amps) and has a higher RPM rate. That higher RPM generates more pressure.

[nick0188]

that code is from your switch for the pump mod.. 100% normal

I run the switch in the on position 99% of the time (on as in the wire connected as it would be the OEM way, NOT the pump mod way).

So no, that’s not the case. Even with the switch on making the pump (supposedly) OEM controlled I can watch this fault counter increase.


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[Shane Horning]

I have 2 cwa50 tied together and run both @ 100% when it's hot weather but have a switch to make it run like OEM

[Waffles_s4]

Stock pump max Rpm is 5800.
Swa100 is 7000 Rpm.

About 18% speed diff, but the swa can draw more power and move liquid faster, though not as much as everyone might think.

If my math is correct the CWA100 can pump 83ml per second more than the stock pump, which as u can imagine not a huge amount.

I still think the stock pump running at 100% is the best, cheapest option.

There might be a way to run it 100% via vagcom settings, so no cel or errors are thrown, or maybe adding a on/off switch under the hood.

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[bhvrdr]

Stock pump max Rpm is 5800.
Swa100 is 7000 Rpm.

About 18% speed diff, but the swa can draw more power and move liquid faster, though not as much as everyone might think.

If my math is correct the CWA100 can pump 83ml per second more than the stock pump, which as u can imagine not a huge amount.

I still think the stock pump running at 100% is the best, cheapest option.

There might be a way to run it 100% via vagcom settings, so no cel or errors are thrown, or maybe adding a on/off switch under the hood.

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Cwa100 has around 60% more flow than cwa50. You can figure it more precisely from their specs

[Shuga]

Stock pump max Rpm is 5800.
Swa100 is 7000 Rpm.

About 18% speed diff, but the swa can draw more power and move liquid faster, though not as much as everyone might think.

If my math is correct the CWA100 can pump 83ml per second more than the stock pump, which as u can imagine not a huge amount.

I still think the stock pump running at 100% is the best, cheapest option.

There might be a way to run it 100% via vagcom settings, so no cel or errors are thrown, or maybe adding a on/off switch under the hood.

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And running the stock pump at a 100% would still give us an increase?


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[Waffles_s4]

Cwa100 has around 60% more flow than cwa50. You can figure it more precisely from their specs

My math is based on their specs, where do u see 60% more flow?

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[Waffles_s4]

Based on specs above, it's 12.5% more, which happens to be close to the 18% difference in Rpm (5800 Rpm vs 7000 Rpm)

That 12.5% would equal about 83ml per second.

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[Waffles_s4]

And running the stock pump at a 100% would still give us an increase?


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Twice as much flow as current rate

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[bhvrdr]

Based on specs above, it's 12.5% more, which happens to be close to the 18% difference in Rpm (5800 Rpm vs 7000 Rpm)

That 12.5% would equal about 83ml per second.

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Cwa50 fows 25l/min at .6bar. Cwa100 flies 40l/min at a higher head of .65bar

Twice as much flow as current rate

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The oem pump only maxes 50% duty cycle stock pwm? You sure?

[Waffles_s4]

Stock pump can flow max of 35l/min as the specs mention in the post. It's fair to take the max values of both pumps, don't u think?

Even 25l versus 40l at the same pressure, that amounts to 40% difference (60% faster) . But if we run the stock pump at 100% Rpm, then it's still twice as much flow as its current state.

I have yet to see the oem pump running at more than 50% actual duty cycle, which is ENG100479, no matter coolant temp, and no matter RPM.

I stand to be corrected for all the stats above.

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[bhvrdr]

Based on specs above, it's 12.5% more, which happens to be close to the 18% difference in Rpm (5800 Rpm vs 7000 Rpm)

That 12.5% would equal about 83ml per second.

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Twice as much flow as current rate

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Stock pump can flow max of 35l/min as the specs mention in the post. It's fair to take the max values of both pumps, don't u think?

Even 25l versus 40l at the same pressure, that amounts to 40% difference. But if we run the stock pump at 100% Rpm, then it's still twice as much flow as its current state.

I have yet to see the oem pump running at more than 50% actual duty cycle, which is ENG100479, no matter coolant temp, and no matter RPM.

I stand to be corrected for all the stats above.

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Its 40l at a higher head so probably more around 42 at the same head. 42 is 60% greater than 25l.

It looks like depending on head pressure its anywhere from 40% to 200% more flow...

[Waffles_s4]

Its 40l at a higher head so probably more around 42 at the same head. 42 is 60% greater than 25l.

It looks like depending on head pressure its anywhere from 40% to 200% more flow...

I corrected the numbers, depends how u look at it, but yes, 60% faster, or 1.6 times faster, or 40% difference

My point is since the stock pump is only running at 50% duty, it's flowing currently half as much coolant as it potentially can.

Adding the Swa100, will probably run also at 50% of its speed (without cutting wires), or 3500 Rpm.

Running stock pump at 100% will be actually faster than plugging the Swa100 at 50%.

For best results, get the Swa100 and cut the wire, but am not sure if that's worth $300sh USD

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[bhvrdr]

Right on or like shane just grab another cw50 too.

[Waffles_s4]

Right on or like shane just grab another cw50 too.

As a spare or connect it in series with current pump (both of them)...

Both of them is actually very interesting... Say u get the second one for $70 used. Then u run one at 100% (connect it directly to power source, without splitting any oem harness), the other oem original pump at 50% (normal mode, as is), and u will get more flow than a single Swa100 (running at 50%), u get double the reliability (2 pumps), and less than a third of the price of a single Swa100 :)

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[4.2 prototype]

As a spare or connect it in series with current pump (both of them)...

Both of them is actually very interesting... Say u get the second one for $70 used. Then u run one at 100% (connect it directly to power source, without splitting any oem harness), the other oem original pump at 50% (normal mode, as is), and u will get more flow than a single Swa100 (running at 50%), u get double the reliability (2 pumps), and less than a third of the price of a single Swa100 :)

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Push/Pull scenario? Maybe one on each side of the HX...

[Waffles_s4]

Push/Pull scenario? Maybe one on each side of the HX...

Gotta honestly see the coolant's normal flow on this engine, I dont have the full picture yet...

[bajan01]

Push/Pull scenario? Maybe one on each side of the HX...

AMS reservoir setup is that way...booster pump on the reservoir on one side of the hx and factory pump on the other side.

[4.2 prototype]

AMS reservoir setup is that way...booster pump on the reservoir on one side of the hx and factory pump on the other side.

Nice, I guess my only other concern would be the post pump heating the fluid back up a bit running at 100%?

[01northernS4]

Nice, I guess my only other concern would be the post pump heating the fluid back up a bit running at 100%?

As a spare or connect it in series with current pump (both of them)...

Both of them is actually very interesting... Say u get the second one for $70 used. Then u run one at 100% (connect it directly to power source, without splitting any oem harness), the other oem original pump at 50% (normal mode, as is), and u will get more flow than a single Swa100 (running at 50%), u get double the reliability (2 pumps), and less than a third of the price of a single Swa100 :)

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also, if the secondary 100% pump would fail does that mean it would obstruct the cooling circuit and stock pump and there would be no warning or code besides seeing your IAT shoot through the roof?

[Shane Horning]

I have both the cwa50 hooked beside so they both pull and push fluid to the same lines. I just put t's in before and after the original pump

[Waffles_s4]

Pics?

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[Waffles_s4]

also, if the secondary 100% pump would fail does that mean it would obstruct the cooling circuit and stock pump and there would be no warning or code besides seeing your IAT shoot through the roof?

Dunno, am assuming here that if the pump fails fluid will still flow through it.

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[Waffles_s4]

also, if the secondary 100% pump would fail does that mean it would obstruct the cooling circuit and stock pump and there would be no warning or code besides seeing your IAT shoot through the roof?

Dunno, am assuming here that if the pump fails fluid will still flow through it.

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[Waffles_s4]

Anyone figured how to run oem pump 100% without cutting wires from the harness?

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[Waffles_s4]

I was thinking if its possible to put electric tape around the connector for the pump, but i need to know which pin is it. Anyone has an Idea?

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[LilRobb]

I was thinking if its possible to put electric tape around the connector for the pump, but i need to know which pin is it. Anyone has an Idea?

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First post on this thread has the wiring diagrams.
It’s the PWM that carries the signal...

[Waffles_s4]

First post on this thread has the wiring diagrams.
It’s the PWM that carries the signal...

Just noticed that. I might try to cover that pin with tape and see if we can run it 100% without cutting any wires.

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[Waffles_s4]

So on the stock pump, pwm is the middle pin. Trying to think of a way to enable/disable the pin as without cutting wires. Covering it with liquid electrical tape, which is not conductive, might be one way.

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[LilRobb]

So on the stock pump, pwm is the middle pin. Trying to think of a way to enable/disable the pin as without cutting wires. Covering it with liquid electrical tape, which is not conductive, might be one way.

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I think you’re overthinking this.
The “cut” could be in your DIY harness you can remove from the car at anytime and either replace with a fresh uncut one or remove altogether and go stock...


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[Waffles_s4]

Edit. I think I see what u mean, but the pins on the stock pump are in different order than the swa100-3. Will still work if I swap wires on the custom wire harness. But then u can just alter the pin of the stock connector like previously mentioned, no?

[krwalkman]

editing now to add pictures and formatting changes:



I have finally gotten around to writing on this topic after people have shown interest. I want to thank Tecomotive.com for making the specs of these pumps so readily available to us all. The data they provide is available from Pierburg but tecomotive graciously makes this information easy to find and decipher on their site. They also make wiring harnesses available. Also please see this thread 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, particularly at flowing against head pressure. The stock pump is a Pierburg CW50.

That said as people add additional heat exchangers, killer chillers, or additional boost tgey may want increased circulation.

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






As you can see the CWA100 almost doubles the flow of the CWA50. Looking at the technical documents, it also massively outflows the hobby style pumps such as the Varimax and Meziere style pumps when any head pressure is seen.


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 it should be known that as far as the specifications suggests, there are no flow differences at all between these pumps. They should both work identically. The only difference appears to be in the following:

CWA 100-3 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:

-The CWA100-2 is an old AMG pump that was used in a ton of Mercedes Benz supercharged applications. The Mercedes Benz part number is: A0005000486

You can source this part from a multitude of MB dealerships as a remanufactured item in the $300 to $350 range. FCP Euro has it currently for $342 and of course that is with a lifetime warranty. Tecomotive also has this available for 249Euro and you can buy the plug and play connector from them. They are a great site to support as well as they have been kind enough to publish most of the research you see here.

-The CWA100-3 is a new VAG pump that is used overseas in the Audi Q7 4M hybrid. The VAG part number is: 4N0965567

Interestingly you can find this pump from salvage cars on ebay for around $75. HOP ON THIS WHILE YOU CAN!




Harnesses for each of these pumps?

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

Here are the part numbers needed for the CWA100-2

Connector to the CWA10-2 Pump: BMW part number: 12527549033 (available at ecstuning or fcp 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 CWA100-3

Connector to the CWA100-3 Pump: VAG part number: 4D0971993 (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 harness for around $10-$15 or less.

PIN Diagrams:

CWA50



CWA100-2




CWA100-3

Hey guys, in response to this, I have the connectors and the wire and such, but I don't see a diagram for the OEM side of the harness. I am curious which wire goes to which. Please forgive my ignorance, this is my first attempt at making a harness for anything. I have never used the weird little crimp terminals or anything as I have only done audio, just to give perspective.

I suppose I can figure it out by looking at the harness as it it exists in the car now. but just figured I'd ask if anyone has a diagram to simplify.

[Waffles_s4]

The oem is cwa50, 3 wires, the middle one is the pwm

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[Audibellybutton]

Does anyone know if a CWA400 would be compatible with a 3.0t? is that super overkill? how about a CWA300

[rs182]

Does anyone know if a CWA400 would be compatible with a 3.0t? is that super overkill? how about a CWA300

Neither will flow well with head pressure of intercooler circuit.

[Waffles_s4]

Neither will flow well with head pressure of intercooler circuit.

Elaborate

[ReDeViL]

is this cwa100 swap relevant for folks who have already upgraded to the AMS Alpha kit?

[bajan01]

is this cwa100 swap relevant for folks who have already upgraded to the AMS Alpha kit?

I’m running the CWA100 with the AMS Alpha/reservoir. I have data that shows that my IATs did not worsen after bumping up to a 203mm crank pulley from a 194mm crank pulley when I switched to the CWA100 at the same time. So this tells me that there is some benefit even though there is already a booster pump on the AMS reservoir.

[ReDeViL]

I’m running the CWA100 with the AMS Alpha/reservoir. I have data that shows that my IATs did not worsen after bumping up to a 203mm crank pulley from a 194mm crank pulley when I switched to the CWA100 at the same time. So this tells me that there is some benefit even though there is already a booster pump on the AMS reservoir.

perfect!
Thanks for the prompt reply!

Did you have to modify the fittings/hoses in any way?
Any pics to share?

pardon the qns, as i'm not a hands on kinda guy, and i leave the stuff to my workshop/garage, though i do want to make sure theres not too much customization involved.