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North American 335d Post DPF Removal Exhaust Ideas
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07-17-2014, 02:09 PM | #45 | ||
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I've read plenty of members stating they would still like to split the exhaust for dual outlets |
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07-17-2014, 02:12 PM | #46 |
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07-17-2014, 03:31 PM | #47 | |
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Technically, it would open up even further at the Y junction of 3" to effective 5" of the dual 2.5", but airflow might not like the angles or something along those lines. I'm no expert. If keep it full 3" if it were me, but definitely add a lightweight muffler or resonators galore. Hate the sound of open exhaust diesels... Reminds me of inland empire bro's in big trucks blowing black smoke. I'd love to keep the exhaust clean and smooth but add aggressive throaty roar as well. |
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07-17-2014, 06:49 PM | #48 | ||
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07-19-2014, 12:46 PM | #49 |
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Two different exhaust notes here:
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07-20-2014, 12:34 AM | #51 |
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I will do a 3.0 inch all the way if it fits, on my tdi's I always did a 2.5 because it fit without any modifications, I will not use a resonator or muffler, so straight pipe from turbo back...
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07-20-2014, 02:57 AM | #52 |
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I've been reading your posts in VWVortex, when I had a VW A5 TDI, and now here for over 5 years. A sub-12 sec 1/4 mile is extremely impressive.
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2011 E90 M57y, ZPP, 248, 494, 655, 6FL SOLD and will be missed Last edited by starrfyr; 07-20-2014 at 03:05 AM.. Reason: VW A5 platform and not an Audi A5 clarification. |
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07-20-2014, 03:34 AM | #53 | |
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By comparison, a 3" pipe has a cross-sectional area of (9/4)(Pi). If you compare a 3" pipe to two 2.5" pipes you can ignore Pi and the ratio of two 2.5" to a 3" is 25/18 or about 139%. Since the 2.5" pipes are probably cheaper and lighter than 3" pipes, and since two 2.5" pipes have almost 40% more flow capacity than the 3" down pipe, it seems prudent to go with the 2.5" pipes after the intersection. However, if a 3.5" DP were used then with 2.5" pipes the excess volume drops to just over 2% which isn't enough. One might consider 3" pipes in the case of a 3.5 or 4" DP. And, yes, I recognize that a 4" DP, and probably a 3.5" as well, is clown-shoes excessive. I only mention it because twin 3" all the way to the tips also seems excessive since twin 2.5" pipes provide nearly 40% more flow than a single 3", which is the practical maximum for the down pipe.
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07-20-2014, 02:25 PM | #54 |
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Not sure if you guys are still looking for the 3" SS straight pipe exhaust thread from Maryland...I think that's my car you're referring to. Here is the link to the thread:
http://www.e90post.com/forums/showthread.php?t=958593 |
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07-20-2014, 02:28 PM | #55 | |
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07-20-2014, 02:58 PM | #57 | |
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"I don't trust this guy." |
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08-01-2014, 04:15 PM | #59 |
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08-01-2014, 04:47 PM | #60 |
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Here's a little teaser of my exhaust. Almost done it. Sorry for the crappy pic. I'm doing like 5 things at once on the car so it'll be a little bit until I can post sound clips. This will be an affordable solution for aftermarket exhaust on our cars, just have to figure out how to make sure it fits everybody's cars with different downpipes (like those that fit and those that don't ). You can't see the tips but they are 3.5" although I will be hacking mine off to put quads on. More info to come later....
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08-01-2014, 06:34 PM | #63 | |
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08-01-2014, 07:38 PM | #64 | |
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08-01-2014, 07:41 PM | #65 |
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08-01-2014, 10:43 PM | #66 |
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I am the fabricator Unfortunately it is not that easy as there is nothing in production for the mid section that is even close. There is not much room on our cars to work with and I still need to come up with a mount near the trans area like the factory pipe. But hopefully I can find a way to streamline the process afterwards so it's not too much work to make more....
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