Ducati.org forum banner
1 - 2 of 2 Posts

·
Registered
Joined
·
54 Posts
Discussion Starter · #1 ·
I have an '03 999s with a M59 ECU and straight pipes (no O2 sensor) I have the VDST software and am trying to re-calibrate the lean/ rich fuel trim setting for it, as its now straight piped. it goes from -127 to +127 and ZERO being centered on the bar when I have the software running from my laptop. I am curious where the stock setting was.. it had to be near +35 before I messed with it. (I lowered it to +32) and now it idles respectively at about 1200 RPM, instead of 1500. but now it seems to have lost some initial throttle on take off from a stop light. what is ideal trim for the bike now that its running without the Termignoni muffler???
It won't even idle at ZERO, so it has to be upwards of +30's (richer). any input is greatly appreciated!!
 

·
Registered
Joined
·
2,127 Posts
Yea, I mean the more fuel you give it, the higher the idle will be to certain extent. You're probably fine at 35 or more. What I do is check the plugs and re-check after doing some hard riding to see if it looks overly rich. Sportbikes like to be rich because it helps keep them cool, there are no real benefits from running the lean and Ducati generally ships them lean, which maybe why the zero mark doesn't work. The moment you add a larger diameter pipe with less back pressure, it will run a bit leaner on it's own.

My advice is to raise it up and use the plugs for verification. You could also throw it on a dyno and check the AFR out the exhaust pipe. Good place to be is 12:1 across the board.
 
1 - 2 of 2 Posts
Top