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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > A closer look at the N55 (a tear down)



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      09-01-2010, 03:15 AM   #45
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Quote:
Originally Posted by Misturrtinnie View Post
So I wonder why they split the down pipe, wouldn't it be better to do a single 3" (or bigger) piping all the way to the back and then split it there?

Probably because they can keep using the same exhaust from the n54 135i.
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      09-01-2010, 08:18 AM   #46
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Quote:
Originally Posted by SfValley335i View Post
Probably because they can keep using the same exhaust from the n54 135i.
This. Bmw is not going to entirely redesign something if they can help it. This helps the bean counters stay happy :-)

this also means someone could put the N55 exhaust on an N54 car...with no more secondary cats in the i models, it could be a cheap way to upgrade to a more free flowing factory exhaust.
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      09-01-2010, 08:23 AM   #47
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      09-01-2010, 10:34 AM   #48
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Quote:
Originally Posted by Doug007 View Post
By far, the biggest gain will be deleting that cat.
Yup, that's where a test pipe comes in...



Matt,
Is a test pipe in the works as we speak?

A test pipe would really open up the exhaust. An EVO IX with an intake, header, test pipe, and a tune really turns it to a different animal. A lot of EVO owners would know that's a fact.

I know it may not be easy, but try applying the same thing to the N55...
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      09-01-2010, 11:18 AM   #49
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Quote:
Originally Posted by e92_m3 View Post
Yup, that's where a test pipe comes in...



Matt,
Is a test pipe in the works as we speak?

A test pipe would really open up the exhaust. An EVO IX with an intake, header, test pipe, and a tune really turns it to a different animal. A lot of EVO owners would know that's a fact.

I know it may not be easy, but try applying the same thing to the N55...
Only thing is, if you delete that cat, there aren't any after that. The n55 on the 335i has no cats or res on the pipes.
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      09-01-2010, 11:33 AM   #50
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Quote:
Originally Posted by shockin330i View Post
Only thing is, if you delete that cat, there aren't any after that. The n55 on the 335i has no cats or res on the pipes.
Hmmm, power delivery would be a lot better IMO if the cat was deleted. Imagine that, no more restrictions. May sound better as well. I would take a free-flowing exhaust any day!

However, there might be drawbacks when the cat is deleted:

1) Maybe too loud for some.

2) The cat should be re-installed when it's time for a smog check.
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      09-01-2010, 07:11 PM   #51
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Stay tuned for some more pictures of the N55...going to take a look into some other areas shortly
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      09-01-2010, 07:54 PM   #52
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thanks Matt - this is a great thread. thanks!!!
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      09-01-2010, 08:23 PM   #53
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get us pics of the IC and piping, they should be easy money makers
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      09-01-2010, 09:17 PM   #54
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Quote:
Originally Posted by e92_m3 View Post
Hmmm, power delivery would be a lot better IMO if the cat was deleted. Imagine that, no more restrictions. May sound better as well. I would take a free-flowing exhaust any day!

However, there might be drawbacks when the cat is deleted:

1) Maybe too loud for some.

2) The cat should be re-installed when it's time for a smog check.
Oh, I'm all for free flow. Just that our cars will be cat less and some people don't like that
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      09-02-2010, 11:58 AM   #55
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Quote:
Originally Posted by e92_m3 View Post
Hmmm, power delivery would be a lot better IMO if the cat was deleted. Imagine that, no more restrictions. May sound better as well. I would take a free-flowing exhaust any day!

However, there might be drawbacks when the cat is deleted:

1) Maybe too loud for some.

2) The cat should be re-installed when it's time for a smog check.
Turbochargers work great to reduce exhaust noise. Check out the underside of a Neon SRT4 sometime, no mufflers!
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      09-02-2010, 02:32 PM   #56
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Quote:
Originally Posted by SfValley335i View Post
get us pics of the IC and piping, they should be easy money makers
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      09-07-2010, 09:09 AM   #57
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Quote:
Originally Posted by Matt@Camber-Toe View Post
This. Bmw is not going to entirely redesign something if they can help it. This helps the bean counters stay happy :-)

this also means someone could put the N55 exhaust on an N54 car...with no more secondary cats in the i models, it could be a cheap way to upgrade to a more free flowing factory exhaust.
Time to get a newbie with the N55 to get an exhaust
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      09-07-2010, 11:00 AM   #58
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I was thinking ab having the muffler shop run me just 1 pipe from the DP back to the mufflers then split it right before the mufflers ... any thoughts ?
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      09-11-2010, 02:07 PM   #59
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Well according to Shiv on another post, these turbos are going to be good for about a max of 390hp. Any idea if we can start upgrading these turbos? I'm gonna need more than 390whp...
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      09-13-2010, 11:40 AM   #60
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Quote:
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I was thinking ab having the muffler shop run me just 1 pipe from the DP back to the mufflers then split it right before the mufflers ... any thoughts ?
like the hpf version?
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      09-13-2010, 11:52 AM   #61
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Quote:
Originally Posted by JDLM View Post
Time to get a newbie with the N55 to get an exhaust
working on that too
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      09-13-2010, 12:23 PM   #62
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Now make a turbo upgrade!!!
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      09-13-2010, 12:53 PM   #63
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Quote:
Originally Posted by maxnix View Post
Not if you want ground clearance on the 1er!

Why BMW kept two 2.5 pipes coming out of the converter.
2x 2.5" diameter pipes has an area that is about equivalent to a single 3.5" pipe.

I see your point about clearance. You could always try to oval the pipe a bit to maintain the same area with a smaller vertical dimension. As long as it's not too extreme, it won't have a huge effect on backpressure. It's primarily a question of flow area.

The biggest gain will be just replacing/removing that huge catalytic converter. The pipe sizes/arrangements past that will be insignificant compared to a high flow cat or none at all.
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      09-13-2010, 03:13 PM   #64
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2x 2.5" diameter pipes has an area that is about equivalent to a single 3.5" pipe.

I see your point about clearance. You could always try to oval the pipe a bit to maintain the same area with a smaller vertical dimension. As long as it's not too extreme, it won't have a huge effect on backpressure. It's primarily a question of flow area.

The biggest gain will be just replacing/removing that huge catalytic converter. The pipe sizes/arrangements past that will be insignificant compared to a high flow cat or none at all.
What cat? I know on the 335i n55 there are no cats or res on the pipes...
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      09-13-2010, 03:33 PM   #65
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Quote:
Originally Posted by shockin330i View Post
What cat? I know on the 335i n55 there are no cats or res on the pipes...
+1... There are no cats on the pipes, the N55's only have that 1 (two stage/structure) cat on the DP

ALthough it has been shown that there are either resonators or cats on the 335 x-drive's... (did anyone confirm whether those were cats or resonators on the x-drives'?)

I know on the N55 X5, there are no other cats or resonators after the DP.
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      09-13-2010, 04:27 PM   #66
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What cat? I know on the 335i n55 there are no cats or res on the pipes...
I was talking about the cat on the downpipe. Removing/replacing that will yield the biggest gains.

How you do the piping downstream of that isn't going to matter nearly as much...
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