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Hi managed to get a hold of US spec underbelly exhaust for my euro 4 spec 959, the exhaust cable is different and was thinking running bike with exhaust valve open.Will this be ok.
 

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I'd be interested if someone dynoed the difference with the exhaust valve, because in a few of the cases I've heard you actually loose torque due to a lack of back pressure.
 

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Hi managed to get a hold of US spec underbelly exhaust for my euro 4 spec 959, the exhaust cable is different and was thinking running bike with exhaust valve open.Will this be ok.
You will feel much better if you get rid of it all together by chopping it out and welding up the hole.
 

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I removed the servo motor and have disconnected the cable, my question is how do I know if the flapper is open or closed withouht tearing the exhaust apart?
 

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Brought the Panigale in for the 12k service where the DDA showed a non-operational servo motor.
Get this: no service or check engine light ever came on the display.
My tech had to remove the faulty servo. What a shame. Still no CE light on display while riding home.
I'll be receiving a new servo motor under warranty in a box...where it hopefully shall remain.

I'd be interested if someone dynoed the difference with the exhaust valve, because in a few of the cases I've heard you actually loose torque due to a lack of back pressure.
I asked my tech the same question and he had two words for that: Hocus Pocus.
 
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Brought the Panigale in for the 12k service where the DDA showed a non-operational servo motor.
Get this: no service or check engine light ever came on the display.
My tech had to remove the faulty servo. What a shame. Still no CE light on display while riding home.
I'll be receiving a new servo motor under warranty in a box...where it hopefully shall remain.
Same here, except I disconnected mine on purpose, indeed no CEL. Dealer freaked out cause they couldn't find the cause so they had to put in a warranty claim and outright replaced mine without giving me an option.
 

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@DJ Shrug Have you since re-disconnected it? If yes, have you felt a difference?
My last DDA at the dealer was aprox last year at this time. I've been riding without an operational servo-motor for who knows how long?

I just remembered another thing to share: While attached to the DDA, the ECU got an update.
Before you ask, Ducati doesn't list, describe or identify the update. Consequently we don't know what it's for and there's no reference number for the tech to identify the update.
 

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I just left it connected - haven't felt a difference from before (or heard any different exhaust tones). If it does make any difference, its got to be at low revs (ie. between 0-3k RPM) at which we don't use unless its idling.
 

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Although the exhaust valve is easy to see in operation on a Monster, it's not as visible on a Panigale. On a Monster, it's open at idle then starts to close around 4000 rpm. Then it re-opens around 5500 and stays open up from there.
 

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I'd be interested if someone dynoed the difference with the exhaust valve, because in a few of the cases I've heard you actually loose torque due to a lack of back pressure.
Brought the Panigale in for the 12k service where the DDA showed a non-operational servo motor.
Get this: no service or check engine light ever came on the display.
My tech had to remove the faulty servo. What a shame. Still no CE light on display while riding home.
I'll be receiving a new servo motor under warranty in a box...where it hopefully shall remain.

@BullAnt , I asked my tech the same question and he had two words for that: Hocus Pocus.
Here's the dyno proof to the question and the answer you're looking for.
Spoiler: no low-end power gains when the valve is closed.

It all starts at the 7ish minute mark.
 
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