W211 AMG Discuss the W211 AMG's such as the E55 and the E63

question about split cooling modification

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Old Oct 26, 2015 | 05:14 PM
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2006 AMG E55
question about split cooling modification

I have been reading conflicting information here. I'm upgrading my cooling system in preparation for boost modifications. I have already installed the 010 Bosch pump and have the PLM HE ready to go in. I found fabtech makes a kit with a BMW power steering reservoir. I have been seeing people say it's not needed because the T fitting does not allow the engine coolant to mix with Supercharger cooling. What is the final verdict? Do I need to split cooling or don't bother.

Thank you in advance.
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Old Oct 26, 2015 | 05:41 PM
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You only need to split the cooling loops if you plan on running a different fluid on the H/X side, or if you plan on using a tank to store cold water. Otherwise the H/X and engine radiator do share fluid, but there is minimal-to-no heat transfer between the two since the reservoir is the only common part of the two loops.
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Old Oct 26, 2015 | 05:43 PM
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2006 AMG E55
Originally Posted by JoeJErnst
You only need to split the cooling loops if you plan on running a different fluid on the H/X side, or if you plan on using a tank to store cold water. Otherwise the H/X and engine radiator do share fluid, but there is minimal-to-no heat transfer between the two since the reservoir is the only common part of the two loops.

Thank you! great to know!
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Old Oct 26, 2015 | 06:01 PM
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Originally Posted by JoeJErnst
You only need to split the cooling loops if you plan on running a different fluid on the H/X side, or if you plan on using a tank to store cold water. Otherwise the H/X and engine radiator do share fluid, but there is minimal-to-no heat transfer between the two since the reservoir is the only common part of the two loops.
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Old Oct 27, 2015 | 03:44 AM
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Originally Posted by JoeJErnst
the reservoir is the only common part of the two loops.
Joe, could you clarify… What reservoir are you talking about? In stock form?
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Old Oct 27, 2015 | 10:25 AM
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Good basic information that everyone here should know but surprisingly I don't believe is common knowledge in this forum. Cheers Joe.

Originally Posted by JoeJErnst
You only need to split the cooling loops if you plan on running a different fluid on the H/X side, or if you plan on using a tank to store cold water. Otherwise the H/X and engine radiator do share fluid, but there is minimal-to-no heat transfer between the two since the reservoir is the only common part of the two loops.
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Old Oct 27, 2015 | 10:38 AM
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Originally Posted by Max.H
Joe, could you clarify… What reservoir are you talking about? In stock form?
It's the tank where you add engine coolant.
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Old Oct 27, 2015 | 10:43 AM
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Originally Posted by TheTherapist
Good basic information that everyone here should know but surprisingly I don't believe is common knowledge in this forum. Cheers Joe.
We being one of the newest readers to the forums there is a lot of information to digest. Also, it's not always clear what the agreed upon answer is by the community without separating the topic and asking a pointed leading question to get an objective answer instead of subjective comment.

I have learned a lot already and am always looking to learn more.
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Old Oct 27, 2015 | 11:53 AM
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2004 W211 E55 AMG >>gone but not forgotten > W123 280E > W124 E280 > W126 380SE
Originally Posted by FLE55AMG
We being one of the newest readers to the forums there is a lot of information to digest. Also, it's not always clear what the agreed upon answer is by the community without separating the topic and asking a pointed leading question to get an objective answer instead of subjective comment.

I have learned a lot already and am always looking to learn more.
Maybe I didn't word that right. I was inferring that not just new members but a lot of long term members also were probably not aware of this (including me). We're all always learning...
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Old Oct 27, 2015 | 02:28 PM
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Splitting the cooling loop will yield better results. It's not dramatic, but it is there (and since it's cheap and simple to split the loop, why not).

It makes sense since, because even though the coolant in the intercooler does not directly mix with the engine coolant, it still flows past a T barb connected to engine coolant, so some heat transfer does occur.
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Old Oct 27, 2015 | 02:34 PM
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By the way, the BMW reservoir is vented to open air, it does not allow the coolant loop to pressurize, and coolant sprays out under heavy coolant flow. Previously I sealed my reservoir up and installed a grease pressure valve fitting, but that only last so long before the valve wears out.

I'm also about to install a much better solution that allows the loop to pressurize, won't spray coolant, and it should look factory'ish. I'll post photos when it's done.
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Old Oct 27, 2015 | 02:37 PM
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I was wondering if anyone has ever data log to see what the difference in temp is. With and without split cooling. That I have not found i'm sure someone as.
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Old Oct 27, 2015 | 03:48 PM
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Originally Posted by JoeNobody
Splitting the cooling loop will yield better results. It's not dramatic, but it is there (and since it's cheap and simple to split the loop, why not).

It makes sense since, because even though the coolant in the intercooler does not directly mix with the engine coolant, it still flows past a T barb connected to engine coolant, so some heat transfer does occur.
Bingo
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Old Oct 27, 2015 | 03:49 PM
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Originally Posted by viper04
I was wondering if anyone has ever data log to see what the difference in temp is. With and without split cooling. That I have not found i'm sure someone as.
I'm wondering myself? I just bought a data logging software/hardware to log my car stock VS after modifications.

Last edited by FLE55AMG; Oct 27, 2015 at 04:15 PM.
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Old Oct 27, 2015 | 08:32 PM
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Right now Im seeing 30 degrees above ambient in stop and go and about 20-25 degrees above ambient cruising 40-50mph. Not split just CM30 and cooling system bled.
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