Interest? Section 1 w/ X-Pipe

08E86M-475 · 04-30-2010, 12:33 AM

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.

08E86M-475 · 05-11-2010, 08:20 PM

bump...

here's what i'm talking about... http://www.bmwusa.com/standard/conte...portparts.aspx

see page 37 of 2008 Z4 catalog.

Spreadsheet · 05-25-2010, 08:27 PM

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.

Diokaef · 05-25-2010, 10:16 PM

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.

Diokaef · 08-03-2010, 04:17 AM

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

04-30-2010, 12:33 AM	#23
08E86M-475 Enlisted Member 2 Rep 30 Posts Drives: '08 E86 ///M, '15 ///M235iX Join Date: Feb 2010 Location: Loveland, OH iTrader: (0)	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.
	Appreciate 0 Quote

05-11-2010, 08:20 PM	#24
08E86M-475 Enlisted Member 2 Rep 30 Posts Drives: '08 E86 ///M, '15 ///M235iX Join Date: Feb 2010 Location: Loveland, OH iTrader: (0)	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
Spreadsheet Enlisted Member 5 Rep 48 Posts Drives: Black 2007 Z4MC Join Date: Feb 2009 Location: Oklahoma City, OK iTrader: (0)	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.
	Appreciate 0 Quote

05-25-2010, 10:16 PM	#26
Diokaef Engineer 212 Rep 2,122 Posts Drives: M235I 2015, 335i 2011 Join Date: Dec 2009 Location: TAMPA FL iTrader: (17) Garage List 2008 Z4M Coupe [6.33]	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.
	Appreciate 0 Quote

08-03-2010, 04:17 AM	#27
Diokaef Engineer 212 Rep 2,122 Posts Drives: M235I 2015, 335i 2011 Join Date: Dec 2009 Location: TAMPA FL iTrader: (17) Garage List 2008 Z4M Coupe [6.33]	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
	Appreciate 0 Quote