Target A/F and tune questions for '08 S4Rs Tricolore

[vnmous1]

Hi. OK, so I have a great Ducati dealership locally (MCC in Villa Park IL) was going to use them to do a quick a/f check on my new (to me) 08 S4Rs Tricolore.
Short version; they just relocated and haven't got the dyno room ready so I went elsewhere to take a peek before I hammer on this thing.

Background; I do calibration on EFI (primarily forced induction) cars, so I'm, uh...at least somewhat knowledgeable in this arena.

Bike has a full (dual) DP Termi setup with airbox and ECU. All maintenance has been done. 8500 on the clock. Everything done around 7800.

My assumption was that I'd see +/- 125 at the tire since they claim 130@9250. I figured -7% as a standard driveline loss and maybe +5% for the mods. Yep, that's almost exactly what it was, BUT-

I knew it was fat at idle. You can smell it and the tips are pretty dark. I haven't pulled the plugs because I was going to dyno it anyway and they were only about 1k old so should be fine. It also felt a little weak in the midrange (3-6K) so I wanted to see what was up.

First of all, at idle, it was nowhere even near Stoich for 93 octane. We were using a tail sniffer, so assume 1/4 to 1/2 point lean, but it was like 11.7-12.1 at idle! Yep, fat.

First pull showed a sizable dip from 4-6k, then it shot up (and stayed at 13:1 from 6500 rpm on up! No detonation and nothing went boom so we did one more quick pull and it was literally identical. By the way, I assume it's the DP ECU upgrade that puts the rev limiter up to 11k versus what I'd assume it would be....like 9500-9700 given that they rate peak hp at 9250.

Anyway, I've spent the past couple of days searching the web...some forums...calling Ducati dealers that have dynos and therefore I assume do some performance tuning...I even called Ducati USA in CA (and found out it's two people answering phones and looking up stuff in manuals).

NO one has been able to give me a target a/f ratio for these engines, or if there are electronics that will help deliver a commanded a/f ratio. I'll assume it should be 11.5-12.0:1 at WOT like most internal combustion engines, but no one seems to know. Nor do they now why the DP ECU would deliver such a whacked out result.

Spoke to Dynojet about a Commander 3. Apparently it's the same for the '07 and '08, so they DO make one although everything only shows the '07.

I'm wondering how it will work with the DP/Termi ECU. Clearly it's designed to work with the stock one. And I assume you'd need to kill the O2 and everything would be in Closed Loop. So...by using the DP ECU, those two things should already be in place. I guess the only potential negative to using the DP ECU is that maybe it would place the adjust-ability of the Commander 3 outside of it's ability/parameters.

So....sorry for the novel, but at the end of the day, I'm curious as to what the a/f should be on this engine at WOT and if all assumptions are correct in that idle should be at Stoich for the fuel (93 @ 14.7 in this case).

And if anyone's used the PowerCommander 3 on the DP upgrade ECU or if you went back to the stock one.

Thanks in advance for your help and guidance. I knew when I got back on a Duc that it would be a freaking thrill   My last ones were SO simple. Couple of flatslides and a 1/4 turn throttle and life was good.

BJ
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2008 S4Rs Tricolore #145
2007 Shelby GT500 10.36@131.65

[Speeddog]

A good bit of specific info here:

http://www.bikeboy.org/s4rsmonstertermikit.html

He's got lots of dyno reports on other Ducs there, poke around a bit.

[vnmous1]

A good bit of specific info here:

http://www.bikeboy.org/s4rsmonstertermikit.html

He's got lots of dyno reports on other Ducs there, poke around a bit.

excellent.  Thanks!

[motoxmann]

11.5-12.0 is rich as hell for any naturally aspirated internal combustion engine under full load/throttle, especially more modern engines. Thats even crazy rich for an older carbed motor. 11.5-12.0 is what you'd tune for in a higher boost setup in a turbocharged setup. I dont even run my turbo honda that rich at almost 400whp.

Any decent n/a motor under wot, when tuning for af, you want 12.5-13.0 at lower rpms and 13.0-13.4ish at higher rpms, higher range of that will make more power but may det if the motor isnt efficient at exhausting heat well and/or if it has aggressive ignition timing. Lower range of that is safer, but a hair shy on power