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04-30-2010, 12:33 AM | #23 |
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veeery interested... let see a dyno. $750 for x pipe straight pipe combo replacing section1 and 2 with no resonator. is there any way to post the BMWMotorsprts exhaust design picson here? i have the pic. this typle of set up with euro headers, stock cans, tune and 4.10 is all i'm doing to my M.
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05-11-2010, 08:20 PM | #24 |
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bump...
here's what i'm talking about... http://www.bmwusa.com/standard/conte...portparts.aspx see page 37 of 2008 Z4 catalog. |
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05-25-2010, 08:27 PM | #25 |
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I happened to see this when browsing around this evening. Searched for this thread to post and see you had found it already. BMW Motorsport placed X-over in section 1. Note where the O2 sensors are located, just after the junction of headers to section 1. If I had full version of Adobe, I could post a pic of this at http://www.bmwusa.com/Standard/Conte...portparts.aspx (Catalog 2008 Z4.pdf, page 37), but do not and can not.
May be more to this story than just a dismissal, as the S54 pulses should be evenly matched by exhaust header bank. I haven't found the exact firing order for the S54, but the two common straight-6 firing orders of: 1-5-3-6-2-4 or 1-4-2-5-3-6 both yield pulses happening every 240 degrees of crank rotation for the front 3 vs back 3 cylinders. Thus a X-over close to headers in section one would join up to generate a push/pull ehaust effect every 120 degrees of crank rotation. Just as a matter of effect for some readers, if the engine is running at 8,000 RPM, it is only generating 2,667 firing pulses per minute. |
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05-25-2010, 10:16 PM | #26 |
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Drives: M235I 2015, 335i 2011
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I'm planing on doing that but I want to add 100 CEll's metallic cat before the X or before the mufflers and with the AA headers + Eisenmann muffler, maybe a resonator (because I don't want it to be that loud) and then see what happens.
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08-03-2010, 04:17 AM | #27 |
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Drives: M235I 2015, 335i 2011
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don't do it, You will loose dynamic cylinder pressure on a non-Vx engine, causing miss fire of the cylinders.
here is something that you may want to look at. I posted a thread about it. http://www.zpost.com/forums/showthread.php?t=415265 |
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