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Forced Induction Forum
Discuss supercharging, turbocharging and even nitrous and water injection here.

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Old 04-13-2017, 01:11 PM   #1
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Flipping a "top mount" turbo manifold

Do the Chinese ebay m50/m52 turbo manifolds have symmetrical flanges? In other words, can you use a "top (front of engine) mount" manifold and flip it upside down to make it a bottom-rear mount? I have asked some of the ebay sellers, but they just tell me what the listing calls it.

As far as I can tell, the flanges are symmetrical, but the angle of the turbo flange and downpipe flange (if equipped) would be the limitation. Space aside, they look like they would be flip-able.
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Old 04-13-2017, 01:38 PM   #2
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m5x is symmetrical
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Old 04-16-2017, 07:03 AM   #3
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Keep in mind, that some of the top mount manifolds are angled, so that the turbo doesn't collide with the hood. This may be for chassis/turbo clearance next to the engine.
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Old 04-17-2017, 10:55 AM   #4
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Originally Posted by sda2 View Post
Keep in mind, that some of the top mount manifolds are angled, so that the turbo doesn't collide with the hood. This may be for chassis/turbo clearance next to the engine.
Yes, I have seen that. There are also some other subtle geometric differences, like the distance between the head and the mid-line of the turbo flange. I feel like I have more space than the bottom-mount e46 builds I have seen, but not that much more.
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Old 04-17-2017, 01:12 PM   #5
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why would you need it to be bottom mount. Either way, you're not going to hide that turbo
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Old 04-18-2017, 09:19 AM   #6
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There is so little room up there. It looks like E53 has the same space problem e46 has (I specifically re-read Pole_position's build), but because of the chassis differences, has more room down below--particularly once the factory cats are gone.

It would simplify many things to put it back there. Yes, it would be nice to hide it, but that's not the point, of course.
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Old 04-18-2017, 10:46 AM   #7
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I think if you had a custom "up pipe" made once you've decided on turbo placement, with the manifold mounted, you could make it work. But it would be a fair bit of test fitting, ie have the manifold bolted to the engine and the turbo hanging where you want it then, then tack a bar between the two flanges.


Gurov had done this in his thread:

http://forum.e46fanatics.com/showthread.php?t=773653

He used a Tcd manifold flipped over with a couple of generic extensions (but again it wasn't an x5 so I'm not sure how it would work for your application):







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Old 04-18-2017, 11:43 AM   #8
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I think if you had a custom "up pipe" made once you've decided on turbo placement, with the manifold mounted, you could make it work. But it would be a fair bit of test fitting, ie have the manifold bolted to the engine and the turbo hanging where you want it then, then tack a bar between the two flanges.


Gurov had done this in his thread:

http://forum.e46fanatics.com/showthread.php?t=773653

He used a Tcd manifold flipped over with a couple of generic extensions (but again it wasn't an x5 so I'm not sure how it would work for your application):







That is interesting. An uppipe like a WRX is something I had thought about for top mount, but I wouldn't have believed you could squeeze a functional downpipe past the motor if he hadn't posted pictures of it. The wastegate plumbing is problematic, but maybe the answer there is internal...less pipes.
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