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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > oil cooler duct change



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      01-17-2014, 10:29 PM   #1
autoart
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oil cooler duct change

I changed the oil cooler duct to a m3 duct, the air goes only in to the oil cooler and not the brakes. I will so how it works. I also trimmed the mesh screen to get more air in. Not a direct swap, would have been easier if I removed the light, but I wanted to keep it.
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      01-18-2014, 05:34 PM   #2
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Pointless.
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      01-19-2014, 08:08 PM   #3
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Pointless.
+1 lol
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      01-19-2014, 08:34 PM   #4
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if it was pointless, BMW wouldn't have engineered a separate duct for the M3.
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      01-19-2014, 10:33 PM   #5
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Quote:
Originally Posted by NudeLobster View Post
if it was pointless, BMW wouldn't have engineered a separate duct for the M3.
Wrong. BMW made a duct that went from the aesthetic design team's front facia opening to the oil cooler. If they spent time "engineering" much of anything on that duct, it was wasted money. All it is is a way to match one shape to another...which the OP did not do.
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      01-19-2014, 11:18 PM   #6
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Quote:
Originally Posted by pwr hungry View Post
Wrong. BMW made a duct that went from the aesthetic design team's front facia opening to the oil cooler. If they spent time "engineering" much of anything on that duct, it was wasted money. All it is is a way to match one shape to another...which the OP did not do.
ah, didn't look close enough at the pics. just skimmed the pics and saw that comment. Yeah, that M3 vent doesn't line up at all or help at all.
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      01-20-2014, 11:02 AM   #7
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Yes you are correct it does not line -up perfectly, but you guys are missing a big part of it. If you bother to look at YOUR oil cooler duct you would see a lot of the air is directed into the brakes, not the oil cooler. This goes only to the oil cooler and zero to the brakes.
Driving around yesterday I saw the temp. of 10-20 degrees lower for my oil temp on a 74 degree day. That was the point of the project.
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      01-20-2014, 11:11 AM   #8
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Mine broke into pieces at some point, and I had it all pulled out about 4 months ago.

While temps are low, I haven't noticed a change in oil temp.

I'll probably throw one back on at my next oil change, but I don't think that thing does too much.
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      01-20-2014, 12:09 PM   #9
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Since it does not appear that you have created any sort of ideal flow path, wouldn't it have been equally effective to just block off the flow path to the brakes?
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      01-20-2014, 03:46 PM   #10
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To me the m3 duct is a ideal flow path. I had the part lying around so I tried it. Blocking the brake opening might work as well.
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      08-31-2022, 03:46 PM   #11
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autoart, I know this is an old discussion but do you have (or does anyone else know) the part number for the original oil cooler duct that you swapped out (it's the one on the right in the pictures above)?

I'm retrofitting an oil cooler on to my 2011 non-M 335 and I'm having a hard time finding the correct oil cooler duct. All of the ones I have found interfere with the existing brake duct so I think I need one that integrates the brake duct like the one above.

Last edited by ratchet67rsss; 08-31-2022 at 03:46 PM.. Reason: punctuation
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      09-01-2022, 01:59 AM   #12
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Quote:
Originally Posted by ratchet67rsss View Post
autoart, I know this is an old discussion but do you have (or does anyone else know) the part number for the original oil cooler duct that you swapped out (it's the one on the right in the pictures above)?

I'm retrofitting an oil cooler on to my 2011 non-M 335 and I'm having a hard time finding the correct oil cooler duct. All of the ones I have found interfere with the existing brake duct so I think I need one that integrates the brake duct like the one above.
There's no oil cooler duct for non-M sport cars I don't believe. Recently did the same on my Pre-LCI but I just took out the fog lights and called it a day. Next option would be to get an M Sport bumper or M3 replica
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      09-02-2022, 04:13 PM   #13
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There are a few factors: which bumper do you have? M or none m?
Your best bet is to go to real oem and find the correct part# for your car.
otherwise, you can buy something and modify it.
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      09-07-2022, 12:52 PM   #14
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Luper52 , based on RealOEM, when I use the VIN (E264204) from the donor car (which had the S715 M Aerodynamics package and S840 High Speed Synchronisation) it shows a front right air duct for vehicles with S840 High Speed Synchronisation (51647229188) and a front right air duct for vehicles with both S715 M Aerodynamics package and S840 High Speed Synchronisation (51748047408). Wouldn't that indicate that there is an air duct for vehicles without the S715 M Aerodynamics package? Maybe M sport and M Aerodynamics are two different things? BMW has always confused me with all their different model codes and option packages.

I tried that duct (51647229188) and it interfered with both the headlight washer, which I could remedy relatively easily and the brake duct which would be much harder to remedy.

Under the VIN for the donor car RealOEM also lists a front right brake air duct (51747229186) that is a different part number than the one I have so maybe that one wouldn't interfere with the oil cooler duct listed above (51647229188). When I look at pictures of that brake duct though it doesn't look like it will work so I'm hesitant to order it without independent confirmation.

autoart , I've got the non-M sport bumper. Since the duct I referenced above didn't work and when I put my VIN in to RealOEM there are no options for an oil cooler duct I am out of ideas for stock options. That's why I'd like the part number for the duct you swapped out since it's the only one I've ever seen that appears to integrate the oil cooler duct and the brake duct. I know that this isn't the right one for my car but I think it would be the best option for me to begin modifying. I've searched for images of all the part numbers I found on RealOEM for my car and the donor car and none of them show the brake duct and oil cooler duct integrated like yours.

Some people have said that they just leave the duct out but given that the stock oil cooler is relatively small anyway I'd like to have air directed to it to get the best performance out of it. I would even go so far as to only have the oil cooler duct and leave the brake duct out since, due to their design, the brake ducts have a relatively minor effect anyway.

Last edited by ratchet67rsss; 09-07-2022 at 12:53 PM.. Reason: typo
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      09-07-2022, 12:57 PM   #15
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Quote:
Originally Posted by ratchet67rsss View Post
Luper52 , based on RealOEM, when I use the VIN (E264204) from the donor car (which had the S715 M Aerodynamics package and S840 High Speed Synchronisation) it shows a front right air duct for vehicles with S840 High Speed Synchronisation (51647229188) and a front right air duct for vehicles with both S715 M Aerodynamics package and S840 High Speed Synchronisation (51748047408). Wouldn't that indicate that there is an air duct for vehicles without the S715 M Aerodynamics package? Maybe M sport and M Aerodynamics are two different things? BMW has always confused me with all their different model codes and option packages.

I tried that duct (51647229188) and it interfered with both the headlight washer, which I could remedy relatively easily and the brake duct which would be much harder to remedy.

Under the VIN for the donor car RealOEM also lists a front right brake air duct (51747229186) that is a different part number than the one I have so maybe that one wouldn't interfere with the oil cooler duct listed above (51647229188). When I look at pictures of that brake duct though it doesn't look like it will work so I'm hesitant to order it without independent confirmation.

autoart , I've got the non-M sport bumper. Since the duct I referenced above didn't work and when I put my VIN in to RealOEM there are no options for an oil cooler duct I am out of ideas for stock options. That's why I'd like the part number for the duct you swapped out since it's the only one I've ever seen that appears to integrate the oil cooler duct and the brake duct. I know that this isn't the right one for my car but I think it would be the best option for me to begin modifying. I've searched for images of all the part numbers I found on RealOEM for my car and the donor car and none of them show the brake duct and oil cooler duct integrated like yours.

Some people have said that they just leave the duct out but given that the stock oil cooler is relatively small anyway I'd like to have air directed to it to get the best performance out of it. I would even go so far as to only have the oil cooler duct and leave the brake duct out since, due to their design, the brake ducts have a relatively minor effect anyway.
Yes M Aerodynamic has a different front bumper. Quite odd looking too. I recommend the M3 replica bumper with ducts. Easy to get, made for ducts, and lots of people run m3 bumpers because of this
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      09-14-2022, 10:14 PM   #16
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I appreciate the clarification and recommendation.
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      09-15-2022, 02:46 PM   #17
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      10-04-2022, 03:42 AM   #18
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M replica bumper and 335iS ducts is the way to go... skip the oem fog-lights as they are useless anyway and are just blocking the airflow to the oil cooler...
Direct fit on the passenger side, on driver it depends what you have there - e.g. additional Mocal type AT oil cooler will surely require heavy cutting as it is much thicker and larger in general plus the needed fan is the next challenge to fit.
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