[mox]

Hi, my 1198sp was fitted with termi exhaust slip ons and ecu. Constantly backfires when i'm backing off the throttle. The dealer tried changing the ecu, even putting on the stock pipes and the stock ecu, checking the TPS, putting full system termis with race ecu, replaced sparkplugs, still backfires. Any input is greatly appreciated.

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[ZDM]

Is it backfiring in other words fuel being ignited in the exhaust or is it growling off throttle. If an experienced dealer can't fix it that's unusual.
...Bad fuel.....old fuel....sometimes w/ the changes in weather condensation will develop in the tank. Siphon or remove the tank and dump the fuel old fuel out. Also the advent of ethanol fuel doesn't help.
Did the dealer "zero out" the TPS (throttle positioning sensor) that's a must do when changing out ECUs...

 

[Mospeada]

We have extremely powerful Ducati Superbikes today. But they are severely restricted from the factory in their mapping.

Even with the DP ECU, that gets it near the ballbark. But you still need to map it in order to clean it up below 4500, and to clean it up and refine the map across the board.

Which, I recommend to everyone, to pick up a PCV or a Bazzaaz.

But you're having a backfiring issue, which means that it could be rich. Are you sure your throttlebodies are sync'd and opening up all the way?....causing a rich situation?

Still, I would recommend you get a PCV or Bazaaz.

 

[TomTom]

A lot of small bangs usually means its lean, a few big ones rich or a joint lets air in.
Id start with checking the exhaust joints.

 

[mox]

Thanks for the reply guys..
zdm- it's more of growling off the throttle. Like cooking popcorns when on low rpms and gets louder on high rpms when i get off the throttle. It is not the fuel, will find out though if they zeroed out the TPS when they changed the ecu

Mospeada- throttlebodies already replaced, i am assuming they sync'd it

Tomtom- dealer already checked exhaust joints for leaks



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[Sinner-]

hmm, put it on dyno, see the output, u might be surprised by some higher numbers than expected.

 

[ZDM]

A lot of small bangs usually means its lean, a few big ones rich or a joint lets air in.
Id start with checking the exhaust joints.

Learn something every day! His mechanic must of missed something. IMO today's fuel is a huge part of the problem. Hard starting, poor performance, gasoline goes bad very quickly. The lawn mower fuel in it's container turned that honey color just over several months( Late April-October). When you compare it to new it's startling.