Race baffles and tuning - 848EVO

[Logos]

I'm looking at ordering some A&R race baffles for my bike. Now I'm a bit uninformed regarding whether the bike will need a retune if I do this. I see a lot of bikes getting retuned after having slips ons installed, I assume this is done because bike motors are generally tuned pretty hard - where as most car motors seem to be tuned fairly safely. The Ducati Performance ECU from what I understand is a remap right? Will I need one of these?

I've got no intention of adding more power to the bike, simply just making it a bit nosier.

If anyone could shed some light on this it would be great.

[speed3]

Changing the pipe(s) alters the air/fuel ratio. Tuning gets it back to normal, you probably won't notice any extra power but you'll deinitely notice the smoother power delivery if you get it tuned.

You can either go ECU remap or piggyback fuel controller like a PC5 or Bazzaz to get the tune back to the desired A/F ratio.

[Logos]

Will I have any issues with the health of the motor or will it just run a bit richer?

[Evolution]

Fuel mixture shouldnt change all that much. The bikes run an O2 sensor so the bike is monitoring your AFR's and keeping it within desired paramaters...at least up to 5k rpm. It may go open loop above that I am not sure.

Dont think you will do any hard to it just putting slip ons on it and running it. But if you have the funds, a PC5 combined with a basic ECU reflash to turn off the exhaust valve and the 02 sensor so you can tune the entire rev range is a good thing. (Pro Twin can do this) You dont appreciate how much better the fuelling can get until you actully get it tuned.

[Logos]

Yeah I just wanted the baffles in for some extra noise, given a bit more time I'll get a proper exhaust and tune to go with it.

[ninjaa]

Will I have any issues with the health of the motor or will it just run a bit richer?

Slip ons should be negligible. You have it the wrong way around, exhaust will help flow = it'll run leaner. Put an airfilter on, leaner again

[Evolution]

^^^ Spot on.

[skatman]

Slip on cans or hi-flow air filter wont effect AFR if the bike has an o2 sensor to correct it. If you can increase the efficency of the air flow in and out of the engine
you are going to increase power and torque as the ecu will keep AFRs with in set limits, which will be to add more fuel.

[darkfibre]

Slip on cans or hi-flow air filter wont effect AFR if the bike has an o2 sensor to correct it.

An o2 sensor (narrow band like most bikes) will only adjust mixture on cruise and light throttle. It will not remap the top end to compensate for mods, particularly if the mods change the volumetric efficiency curve relative to RPM.

[Evolution]

^^^ That was my understanding as welll but I am not 100%. I think it is closed loop up to about 5k rpm and then goes open loop from there. I think its the reason why if you fit something like a PC5 to a late model duke you can only tune from about 5k up unless you turn off the 02 sensor with some reflash software, then you can tune the entire range.

On WOT you will get some change in the AFR's, but not sure where the factory bikes sit. If they are already a bit fat from the factory, leaning out a little wont cause you issues. If it is already a little lean, it might not be so good. Generally factories err on the rich side.

Seems there are plenty of people out there who have fitted slip ons other than the termis and havent had any issues. I wouldnt worry about it too much.

[darkfibre]

Forget the 5k rpm open/closed loop ideas you have. A narrow band sensor is only accurate in an extremely narrow window centered at 14.7:1 air/fuel ratio.
At 14.7:1 emissions are great but power is almost non-existant.

As soon as you open the throttle to accelerate (even at 1k rpm) the oxygen sensor MUST be ignored.

I am not saying installing a slip on will cause problems with mixture (each bike will be effected differently), what I am saying is that the oxygen sensor in a standard set up will not always compensate like a lot of people seem to believe.

[Logos]

Well I got the bike today and it has a fair bit of crackle and backfire on throttle off - I'm taking a bit of a wild stab but would the bike be running rich as it is?

[Hoddo]

Dont stuff around, give the Pattersons in Bunbury a call ( Bunbury Ducati ), book it in for some dyno time.
Todd will get the little bastard to boogie. At the very least, give them a call, even if it's just for a chat ( top people )