[Ducati] 999 Exhaust

[Alex Obst]

Alex is right,

I was assuming you were gonna buy the complete DP kit.....if you choose to 
just buy the pipes (headers, etc...)  you will defiantely need to get a 
power commander to adjust the A/F ratio.  There are plenty of maps on 
powercommander's website to help you do this.  And it's really easy to do.  
Also keep in mind that the 999/749 was designed with UNequal length and 
internal diameter exhaust piping....The short story as to make the package 
nice and neat, but technically to get similar  results from an asymmetrical 
exhaust that you would get from an equal-length exhaust kit.

SO, the maps in your current ECM basically fuel one cylinder more (like 
about 20% around idle) to compensate that the pipes are NOT equal in length 
or internal diameter.  Please note that the unequal length and ID are also 
neat tricks to "trick" the cylinders into working optimally when you use an 
unequal design such as the 999/749.  So the mapping and the pipe tricks work 
together to give you a nice result.

Booring enough?  SO, DON"T use your stock ECM (unless you use a power 
commander and map it correctly) with your new pipes.  If the new exhaust kit 
is equal length, you will run one cylinder lean and the other rich....You'll 
know right away something is wrong :O)

So whatever you do, either get the full kit with the newly mapped ECM for 
your kit......OR the exhaust pipes and a power commander with the correct 
mapping for your kit.

It's way easier than I explained, but I wanted to know the reasons why there 
were so many kits out there and the design principals behind them.  
Hopefully that info helped you as well.

Good luck and whatever the kit you choose....you'll love the new sound and 
kick in the pants :O)

-Alex



----Original Message Follows----
From: "Alexander M Ortner" <aortner264789mi at comcast.net>
Reply-To: Ducati Owners Group <ducati at ducati.net>
To: "'Ducati Owners Group'" <ducati at ducati.net>
Subject: RE: [Ducati] 999 Exhaust
Date: Thu, 10 May 2007 11:02:31 -0400
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Hi Roger
The 999 is one bike that consistently makes more horsepower with a bigger
exhaust. I have heard of 56 and 62mm systems on the 999. In any case be
prepared to do some fuel injection tuning or don't do it.

Alex Ortner
aortner at comcast.net
www.alexortner.com




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