PDC

Is this fitting on the back of the fill cap for the IC Circuit supposed to be 'open'?
Just had a new IC pump installed (car runs great) but noticed a small coolant drip out of this exposed fitting. Is this supposed to be open to let the Circuit 'burp' after filling, or do I need to roll back to the shop?
Thank You!

AMG-Driver

Seems you had a little too much new coolant in the system after new IC-Pump installed. The coolant in the system expands a little when it is getting hot. I would wait if some more is coming out but normally it should stop dripping out and it should be o.k...

PDC

Went for another drive last night and had no more drip. Looks like all is well.
Went from the Bosch '010' version to the Pierburg. Noticeable difference. Throttle response is instantaneous and after the drive I can lay my hand on either intercooler for as long as I care to. Not sure I'd even call them 'warm.'

H35

Do you have a part number and a place to buy the Pierburg pump?

PDC

Speedriven sells the CWA-100.

latemodel21

VRP stocks this pump and the price is the best I've seen
http://vrpspeed.com/index.php?route=...product_id=189

Cheers,
Chris

shardul

iTrader: (1)

meziere wp136 is the best bang for the buck

I would also do this.

https://mbworld.org/forums/m275-v12-...reservoir.html

latemodel21

The Meziere is a highly respected product; I always assumed it was designed/intended for a high-flow, low pressure application (like standard engine cooling duties?)
I wont presume to know what the heat exchanger/intercooler resistance to flow is in an SL65 (head pressure in PSI at pump outlet), but on my SL55, I measure over 12Psi of head pressure (when pumping over 6 gallons per minute through the system).

If you look at this chart (compiled from the published flow ratings of the various pump manufacturers) ... you can see the CWA 100 still flows 30 Lpm at 12psi while the WP136 appears to stop pumping altogether at 7 psi of head pressure.

I have tested a few pumps (head to head recording flow at pressure) and the only pump I've found that outpumps the CWA 100 is the ZR1 pump (custom built for GM by peirberg) but at $1200 for the ZR1 pump vs $400 or less for the CWA100, I like the Cwa100 more .

Chris

shardul

iTrader: (1)

The WP136 worked great on my S600

latemodel21

pretty AND cute ? too kind : )

I and countless others have long since come to respect and value your contributions and input/opinions here, so despite published pump performance data to the contrary, I will have to consider including the WP136 in any future testing I do.

The pretty and cute chart was created by Nick (Welwynnick) in a very comprehensive thread that focuses on the M275 chargecooling
https://mbworld.org/forums/m275-v12-...ion-pumps.html

worth mentioning, in my test of 5 different pumps that I did last year (measuring flow and noting head pressure as I measured the time to pump 5 gallons through the same charge cooling system), the 4 pumps that I tested that were on this chart (bosch 002, bosch 010, cwa 50 and cwa 100) had performance that matched the graph (< +/- 10%)

Cheers,
Chris

shardul

iTrader: (1)

Hehe just playing around Chris

Doesn't the electrical connector on the CWA100.2 need to be modified to work on a car that just has 2 wires going to IC pump.

What that being said it is the same pump used in the M157 cars I think dealer cost is about $275

latemodel21

I had heard that the price was dropping on the Mercedes OE version of the cwa100.2 , but I just looked up the number I had handy (0005000486) and I see the wholesale is currently $400 (up from $373 last I looked). If you have a different part number or better source that would make sense as I did hear the price was coming down a little.

Using the Mercedes version DOES require that you find the correct 4 pin connector. Hooking this to your car requires that you wire pins 3 and 4 to +12 and pin 1 wired to ground (pin 2 is unconnected). This wiring applies to both the cwa50 and cwa100. I have a BMW part number for the connector housing and pins that I use .... not sure if you can get the Mercedes branded connector without buying a whole harness .... BUT in any case, all of the connectors are made at the same place, TYCO electronics .

The pump that VRP offers is a cwa 100 (presumably .2) that is set up from the factory with a 2-pin connector (+12 and ground) ... and comes with the 2-pin connector'd pig-tail to attach to your harness AND, it comes with a mounting bracket (both the bracket and connector you will have to source/fab if you are using the OE cwa100).

Cheers,
Chris

shardul

iTrader: (1)

Have a better source hence the lower price.

wlelandj

Chris,
So, just to be clear, if I were to order that pump from VRP, it should be plug and play on a SL65? I have the Meziere pump, but there aren't any shops near that I trust. Pretty sure the front pump is shot (dealership says no) and I know my rear sump pump is. (IATs in the 120's+ even on 40deg day) :/ I'm trying to get down to have Shardul install my KillerChiller and pump, but one of my struts has a small leak if I let the car sit for an extended period. Seeing that the VVK coilovers (hopefully close to completion and before I have a failure) are the bigger expense, I probably need to have that done first. This would be something that would help in the meantime. Maybe mount the Meziere in the trunk?
Thanks,
Leland

latemodel21

well, It comes with a new pigtail to install on your harness ... so it will plug in once you install that. (can't really call it plug and play ... but it is as easy as it gets to adapt to).
I can't say I know off hand if your wiring is rated for 10 amps (pump draws 8 to 8.5 amps IIRC). OK, I just took a look at the WebETM and it looks like your car has 1mm wire up to the separation point x35/15 (in box with Driver SAM) which should be fine for 10 to 14 amps ... but after that, it is only .75 mm (from the separtation point to the pump, M44) which is not good for much more than 7.5 amps . If it were my car, I would pull a new piece of wire from the separation point to the pump (if installing a higher load pump) 1mm or AWG 16 ( actaully, that is what I did in my SL).

hope that helps,
Chris

wlelandj

Thanks Chris, it does, even if I have zero wiring expertise lol. Another question, if I could? Will not plugging into the harness and having someone wire the pump to run continuously with the ignition on, cause engine codes? Thanks.

latemodel21

No codes. The car does not monitor if the pump is functioning (directly), it only monitors the intake air temp (to determine if Charge cooling is working properly at keeping IAT low enough).

You could have them tie the pump to an open circuit15 fuse so that the pump will turn on anytime the car is turned on.
In my SL55, I actually added a fuse holder (to the circuit15 bus in the passenger side SAM) and then ran heavier wire to the pump from there.

Hope that helps,
Chris

amok55amg

Maybe a stupid question but is it not possible to have the pump running constantly when the car is turned on by changing settings via Xentry?