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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Is there a 328i diff cover with cooling fins?



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      05-17-2018, 08:32 AM   #1
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Is there a 328i diff cover with cooling fins?

Anyone know of a way to add some cooling to our rear diffs?
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      05-17-2018, 01:41 PM   #2
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If you move up to the big diff, VAC makes/made a cover for the 215mm diffs. But I believe this would entail a full 335 rear subframe swap - I'm not sure.

Do you suspect it's overheating? I've seen a pump and external oil cooler setup before but it seems like heavy overkill unless you're tracking. (When are you gonna turn this car into a full race car, anyway? )
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      05-17-2018, 02:35 PM   #3
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Quote:
Originally Posted by Phyrexia View Post
If you move up to the big diff, VAC makes/made a cover for the 215mm diffs. But I believe this would entail a full 335 rear subframe swap - I'm not sure.

Do you suspect it's overheating? I've seen a pump and external oil cooler setup before but it seems like heavy overkill unless you're tracking. (When are you gonna turn this car into a full race car, anyway? )
I’m not really thinking I need more cooling it’s just a DD and occasional Autocross car. But since I’m doing another diff swap and putting in the lsd I figured why not address it now if possible.

The LSD generates traction through friction so it seems like some added cooling wouldn’t be a bad idea...
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      05-17-2018, 05:39 PM   #4
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I know that there is because some of the guys here have one, but I don't think you need a 335i subframe swap, aren't they the same part anyways??
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      05-17-2018, 06:06 PM   #5
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Quote:
Originally Posted by Eagle1oh7 View Post
I know that there is because some of the guys here have one, but I don't think you need a 335i subframe swap, aren't they the same part anyways??
Apparently there is one that fits. And BudVlad probaly has the answer as to which one it is...

http://www.e90post.com/forums/showth...1079016&page=2

My question now is, are there any cover differences in the 328i differentials, meaning 328i and 328xi because the diff Iím building is from a 328xi (for the 3.91 ratio)...
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      05-17-2018, 06:23 PM   #6
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So according to real oem the 328i and 328xi both use the 188L cover and I believe the 188k finned cover (p/n 33117516280) fits those diffs.

Hoping BudVlad can confirm that since it seems heís running one of the vented covers...
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      05-17-2018, 06:28 PM   #7
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Quote:
Originally Posted by Eagle1oh7 View Post
I know that there is because some of the guys here have one, but I don't think you need a 335i subframe swap, aren't they the same part anyways??
I think I was thinking of the M3 rear subframe.
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      05-17-2018, 07:50 PM   #8
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While Iím at it I just want to drop this picture from that other thread in here. This is the vented cover that fits on a diff from a 128i/328i....

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      05-18-2018, 12:26 AM   #9
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2008 E92 N53B30  [5.00]
P.No. 33117516280 will fit 328i diff.
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      05-18-2018, 03:56 AM   #10
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Quote:
Originally Posted by BudVlad View Post
P.No. 33117516280 will fit 328i diff.
Did you have any issues mounting it into the car? In the other threads I saw some references to using a 15mm spacer and different mounting bolt but it might have been on another model, not the e90/92.
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      05-18-2018, 04:27 AM   #11
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No problem with mounting. I used all original mounting bolts. The only issue is exhaust pipe touching one rib as you can see on the other picture. I cut that rib off.
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      05-18-2018, 04:35 AM   #12
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Quote:
Originally Posted by BudVlad View Post
No problem with mounting. I used all original mounting bolts. The only issue is exhaust pipe touching one rib as you can see on the other picture. I cut that rib off.
Ok great info, thank you sir! Cover is ordered...
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      05-18-2018, 09:33 AM   #13
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Yup a fin just needs to be trimmed otherwise it works.
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      06-09-2018, 05:15 AM   #14
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Ok just wanted to update this thread in case anyone finds it searching in the future. The cover Part Number 33117516280 as stated above is a direct bolt up to the diff as stated.

There are a couple issues that need to be addressed to mount the diff into the car besides the trimming of the last fin on the left to clear the exhaust.

The cover’s chassis mounting point at the rear is not the same height as the original cover. There is a 15-16mm difference so although you can mount the cover on the diff perfectly fine, you can’t just bolt it up into subframe of the car. BMW makes 5mm thick aluminum shims and you can use 3 of them. Here is the part number:

BMW Spacer Ring (5mm) - 33176779816

When I looked 3 of these aluminum Spacers/Shims weren’t available in US and they were back ordered from Germany. So a trip to fastenal landed me some stainless washers I stacked to use instead.



Also obviously the single original bolt that mounts the rear of the diff to the subframe is only 110mm long and will now be too short to use with the 15mm spacer that you need to make. I found BMW makes a bolt that’s exactly 15mm longer (125mm) part number:

BMW Hex Collar Screw (M14x1.5x125-10) - 33177852488

Finally some people mentioned 3 of the 8 bolts that mount the cover to the diff need to be longer. So I ordered 3 longer bolts with the cover and then found my stock cover was already being held on with 5 short bolts and 3 longer bolts. So it was a waste to order those because my diff already had 3 longer bolts lol

Last edited by Biginboca; 06-09-2018 at 05:41 AM..
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      06-09-2018, 06:35 PM   #15
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So the job is done. For the record here’s how I trimmed the last fin:



Diff installed perfectly with the shims and longer bolt. That cover trim was perfect to clear my exhaust, that section where it would have hit is factory pipe so if you have the factory exhaust at that point the trim I show above is good.

I know there are many LSD’s, but this is mine and it’s a 3.91...

upload a gif
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      04-24-2019, 01:43 AM   #16
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Is is there a chance to replace the diff cover with the pumpkin bolted on the frame or it is necessary to remove the diff from the chassis? Thanks.
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      04-24-2019, 03:12 AM   #17
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Quote:
Originally Posted by Radu328i View Post
Is is there a chance to replace the diff cover with the pumpkin bolted on the frame or it is necessary to remove the diff from the chassis? Thanks.
You need to drop the diff from the chassis. Itís really not that hard and I canít foresee any way to replace the cover otherwise.
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      04-24-2019, 09:27 AM   #18
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Thank for your answer. I want to change the diff oil but I was not sure to buy right now or later the diff fined cover.
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