Hi guys... here's a problem I've been experiencing for a while now and I can't think what might be causing it (thus I don't know the repair). I'm not well versed in FI let alone superchargers, so I'm looking for some input if you have it. While on the highway for a few minutes and at a sustained speed (say 65mph) I'll feel (and even hear) a slight clunk and a tiny "jolt" and suddenly my supercharger seems like it's turned off. I can mash the throttle and it will accelerate slowly (I suspect like the non-supercharged model) and the exhaust sound is VERY different. I get the sense it's starving for fuel, but not sure what is causing this. If I stop for a minute or two, and then accelerate I'm back to normal and so is the exhaust sound... like it's "reset" itself. I am baffled! Has anyone experienced this and if so, what was the "cure"? Thanks so much, and know that I enjoy reading and learning here (I am relatively new). I have a 2005 Euro Blue SRT6 coupe with 32K miles on it. BoB

 

Most likely you need to replace the intercooler pump.
It is not very expensive, and it is a fairly easy DIY project.

NeedsWings Performance Products. Bosch Intercooler Fluid Pump 010

 

Hi alaxfire... Thanks for the reply. I am not questioning your diagnosis, but am trying to "learn". Can you explain how this intercooler pump functions so I can "understand" the symptoms I am experiencing? If not, no biggy, and THANKS so much for the quick response!! BoB

 

The intercooler pump circulates coolant between the supercharger intercooler( mounted on the bottom of the SC unit ) and the heat exchanger radiator. If it does not do it's thing properly, then the intercooler heats up and a sensor causes the supercharger to disengage until everything cools back down below the sensor lower limit.
The IC is there because the act of compressing the incoming air by the supercharger heats the air up quite a bit and it needs to be cooled back down before being delivered to the intake manifold, else the air fuel ratio goes to crap, besides the fact that hot air does not contain as much oxygen as cool air.

 

I second that diagnosis. Use Bosch pump #392022010. That is the latest upgrade.

 

Here is a brief lesson on the supercharger and how it functions.
CLICK

 

I have driven the SRT coupe in temps above 115 degrees F here in the Phx. area and had the s/c not function. I don’t know what the IATs were. I think I will monitor them this summer.

 

Dr George (Dr of Crossfires), THAT was a PERFECT explanation! You 'da man!

 

And I don't even own one

 

The others have addressed the issue and the likely fix. I just want to let you know, a non-supercharged model will kick an SRT's *** if the SRT's supercharger isn't working. We don't have the potential for this failure and the NA cars are quite fast on their own accord and while they don't have all the power capabilities of the SRT, they would never feel the way an SRT does when there is a supercharger failure. Just thought you should know.....

 

Ahhhhhhh, yes... I'll take your word for that, PNA, but when the S/C is working... wowie!!!!!

 

If your looking for plug and play, the bosch 392022010.... If you are technically inclined, and willing to do some slight modifications, look out for a Pierburg CWA-50 intercooler pump, many BMW's and audi used them.


I had a similar intercooler pump failure at around 7600mi when I got the car. I installed a johnson CM30, along with a supercooler and some other goodies. and although I thought I would never have a problem again, fast fwd 600mi, and the issue crept up again. I am planning to get around to enjoying the car a tad this spring, and am installing a CWA-50 in place. The Pierburg pumps are very popular with the E55/M113K crowd, but require a bit of sourcing for the connector and finalizing the working package.


To make a long story longer, both of my original bosch and CM30 are mechanically sound. The problem is with regards to the design of the pump, and feedback(lack off) if the motor disengages. Both Bosch and CM30 are a brushed motor w/mag coupler drive. If in the event the impeller is overloaded, jambed, jarred, whatever, the unit is designed to uncouple, and the motor just spins freely. The issue is, without knowing why it uncoupled, the motor will continue to run, and will sound like it is still running but not actually flowing until it reaces a complete stop during a power cycle, and the decoupling cause is found. (I tested the org bosch, and the decoupling strength is on the weak side).


One thing to note, that the bosch I reference in my paragraph above is not the 392022010, although very similar, I have not compared the exact differences between the oem installed pump our originally came with to the 392022010. With a wild guess, I would assume the 392022010 has a stronger magdrive then the old orig pumps.


Now the CWA-50 is in a different league, as in being a completely brushless design, and is electronically driven. It can sense and restart if overloaded without power cycling. The impeller is direct drive, and when used in their native application (can bus communication), will send operating parameters to the ecu (not applicable to our application). Plus in a performance to weight comparison, the CWA-50 is much ahead. Its a preferred choice for performance applications, especially those of us with modified setups.

 

Thank you, Sik Srt-6 for the technical info. My car is safely tucked away until a few rainstorms after the last "salting" of our area roads. This is usually sometime in April. At that time I will begin digging into my little car--something I've not done in the two years I've owner her, but coming from a drag racing background which included my own engine building (and even modifying in the pits on raceday), suspension, exhaust, etc., I am looking forward to understanding more about superchargers, and this nice MB engine. I am also planning on checking out the "oil cup", or whatever it is, that many seemed to have installed, and why this modification will help.

BoB

 

Thanks for the info, I too am having the same issue. Do you have, by chance, the Pierburg CWA-50 intercooler pump part number? I would like to install this unit also.
Thanks alot, Ray

 

I believe you are referring to the oil catch can.
This unit removes the majority of the oil suspended in the vapor passed thru the PCV ports on the valve covers before it can get into the intake system, thus ensuring a cleaner system.
This is common practice on aviation engines, why not on ours ?

 

BMW # 11517566335 is one of them


Audi # 8K0965567


Heres a good thread talking about IC pumps for the 55 series amg cars, and details about the CWA-100 and CWA-50. The CWA-50 is more then adequate for our applications.
https://mbworld.org/forums/w211-amg/...w-about-6.html

 

2 cwa50 pumps in series are even better

https://www.youtube.com/watch?v=E423...ature=youtu.be

 

Thats`s the flow through the stock intercooler .

watch my "hose holder" in the vid. Stock AMG part too...

 

Hello Sik SRT-6,

You mentioned in an earlier reply that using the CWA 50 would require some extra work: "...but require a bit of sourcing for the connector and finalizing the working package." Are you willing to elaborate on the work you're mentioning? Do I need specialized equipment or just a good Meter and test light?

Thanks, again, for all your help so far, and your technical expertise!

BoB

 

To get the CWA-50 to work, you need the mating connector which you can order from a audi or BMW dealer, I believe the part numbers are located in that benzworld link. Also you need to add a resistor to one of the signal pins to simulate the motor's "enable" command. I will be able to give more details once I get back to my shop later on this week. But if you read thru the thread it will give you a general ideal, if you can read thru the fluff.