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-   -   e60 m5's.. no wonder there are so much gain from the headers.. (https://xoutpost.com/bmw-sav-forums/other-bmws/19638-e60-m5s-no-wonder-there-so-much-gain-headers.html)

SANguru 09-01-2006 01:00 AM

e60 m5's.. no wonder there are so much gain from the headers..
 
man.. looking at the factory design on the headers, explains pretty much why it gets such lousy gas mileage and sounds so damn whimpy. Can you say BMW purposely detuning the V10?

http://www.m5board.com/vbulletin/sho...835#post841835

I see headers in my future!

JV 09-01-2006 01:33 AM

Those stock headers looked like they'd been run over by a Mack truck!

JV

Quicksilver 09-01-2006 02:36 AM

Interesting pipework. So your getting the new stuff as shown or something different?

SANguru 09-01-2006 02:41 AM

supersprint is really the only option at this point.

Quote:

Originally Posted by Quicksilver
Interesting pipework. So your getting the new stuff as shown or something different?


rayxi 09-01-2006 03:25 AM

I don't know a whole lot about exhaust design but the SS headers look like they aren't equal length whereas the OEM ones are. I'm assuming that keeping equal lengths on the tubing before the collector means each cylinder will see the same backpressure, which is good yes?

vinuneuro 09-01-2006 04:09 AM

Josh, what do bimmer guys use to tune?

SANguru 09-01-2006 11:49 AM

dyno? flow bench? no clue..

Quote:

Originally Posted by vinuneuro
Josh, what do bimmer guys use to tune?


SANguru 09-01-2006 11:52 AM

good question. The concern is the crimping which would really restricts flow. On the a couple of dyno runs, the headers show about a 35hp gain.

Quote:

Originally Posted by rayxi
I don't know a whole lot about exhaust design but the SS headers look like they aren't equal length whereas the OEM ones are. I'm assuming that keeping equal lengths on the tubing before the collector means each cylinder will see the same backpressure, which is good yes?


LeMansX5 09-01-2006 12:01 PM

You need new headers for your M5;).

rayxi 09-01-2006 12:16 PM

Quote:

Originally Posted by SANguru
good question. The concern is the crimping which would really restricts flow. On the a couple of dyno runs, the headers show about a 35hp gain.

Yeah, I saw the crimping. The degree of crimping didn't seem to be the same on all pipes, which negates the benefit of having equal lengths. :dunno: wacky. Looks to me like they needed to crimp the pipe to get it to fit between the adjacent pipes. Not a very BMW solution to the geometry problem.


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