amgstyle

hey guys in the e 55 cooling kit from evo why do we need the resistor ??? can't we just connect the pos. and neg. wires from the stock pump harness and just connect it to the pos. and neg. of the johnson pump ?? i was just wondering why we needed the resistor cause i'm not to familar with wiring stuff ?? thanks for your help

vraa

I know sometimes with LED lights you use resistors to trick the comuter into thinking that more current is being drawn?

Perhaps it's the same issue to prevent some kind of Check Engine light from being set off?

M5KILLR

its so the pump isnt an alway on unit. dont bother they rarely work anyway. the owners even said they are having problems with the pumps. mine doenst work anymore and e55baller had nightmares with his. call kleeman.

medici78

Could it be that the pump wasnt necessarily engineered for coolant? If I understand correctly, the main use for that pump is for marine applications.

Vadim @ evosport

Hmm, are you reffering to relay? There is no resistor in our kit.

Relay is needed since bigger pump draws more current.

BMWEATR

THE ONLY THING "MARINE APPLICATIONS" STAND FOR IS- BEND OVER AND PAY MORE MONEY!!

medici78

Not necessarily, at least not in this case.
The reason is that, while I'm not familiar with marine applications, the pump has a temperature range for the coolant it pumps. I believe the pump was designed not for coolant, but for pumping water out of a boat. I have a suspicion that the E55 application pushes it to the higher end of that range. I'd like to hear from the Evosport or Kleemann folks about this.

Vadim @ evosport

The pump is rated to 212F. It is fed from front heat exchanger, which is typically 10-15F above ambient. So most of the time it sees fluid temperature that is less than 100F.

The pump on my C32 has over 20,000 miles without problems.

medici78

I was wondering what the temp of the coolant was.
I understand that the stock cooling setup is tee'd into the factory radiator and you kit isolates the S/C coolant from the radiator coolant. Does this help lower the I/C coolant temp significantly?

Vadim @ evosport

Yes, separating two circuits makes a difference. Most of the temperature reduction comes from additional heat exchanger.

amgstyle

thanks for your help vadim. yeah sorry i meant to say relay. i was also wondering with the cooling kit will the pump be running all the time or will the ecu turn it on and off when needed ??

enzom

Vadim - I am confused. On my Z06, my coolant temps were typically between 188 and 220 degrees F. Does the supercharger in the E have its own cooling fluid resevoir? How can the coolant temps be so low? Thanks.

Vadim @ evosport

amgstyle: On earlier 03' - 04' 55s pump would come on whenever engine was running. Sometime in 04' MB changed it to only come on when kompressor engaged, so you will not hear it if you open the hood with engine idling since kompressor is turned off.

enzom: We are talking about intercooler circuit, which we separate from cooling system in our kit.