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      12-03-2012, 08:55 AM   #57
BLACK MARKT
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Drives: BMW F10 M5 - ALPINE WHITE
Join Date: Sep 2012
Location: LOS ANGELES

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Thank you for the 411 ... the info on how to read a dyno was helpful!!
(Way back in my Honda street racing days I used to read Turbo Magazine all the time .. lol)

Quote:
Originally Posted by star21 View Post
Here is the link to the dyno graph (PDF file) listed on Akrapovic's site:
http://az79640.vo.msecnd.net/akrapov...2056fd4ec2.pdf

From the dyno sheet it looks like it only has minimal lag on the low end compared to the OEM exhaust but catches up and surpasses near the mid-to-top RPM end.

and the product website for the F10 M5:
http://www.akrapovic.com/en/Automoti...ProductFilter=

I wonder if the conservative performance and sound might have been influenced by the EC-Type Compliance that Akrapovic got certified for? Anyone from European countries know a thing or two about this? I'm assuming it's relating to noise and/or emissions? Not every customer is looking for a drastic increase in exhaust noise or only peak power.

I would've thought that was the intended purpose of a shop's project car to use for shop development. In all seriousness though, what about aircraft grade 321 stainless steel or even better yet inconel? Ceramic coating as an option to keep engine bay temps down as well? I'm wondering on the necessity of the higher grade stainless or inconel, though. Assuming the part is designed correctly, the rotary turbo guys, as well as GT-R, Evo, etc. still use 304 stainless (a common stainless steel that most aftermarket tuners will use) without worry of fatigue or cracking - and rotary turbo exhausts can get hellfire HOT!

I think it'd be great to post up the results of the dyno exhaust test shootout.
Quote:
Originally Posted by star21 View Post
Here is a link to an old (and basic) but still fairly useful article on the importance of how to read a dyno. I think the most important aspect that it mentioned was not to only focus on peak output. A knowledgeable owner is a happy one!

http://www.turbomagazine.com/tech/03...d/viewall.html
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