Really?! On a V4? That sounds simple. No error codes if it doesn't close?
Full throttle Power loss after 9000 rpm
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Really?! On a V4? That sounds simple. No error codes if it doesn't close?
Hi Alex... Yeah that's what is next to check. Was it on a V4?
After checking the Termi Up map and put back the stock map the dyno looks better but the power cut is still there. See image.
Exhaust valve issue has also been exclude to be the problem.
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Does the shop with the dyno have a Ducati DDS or similar tool? There's a ton of data from all the various sensors on the bike, but you need a tool to read it all.
Don't know. But when it was at Ducati they could not detect anything wrong on their analyzer. Does it need to analyze at full power and therefore Ducati missed it?
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The Ducati DDS 3.0 is a branded Texa Navigator. I have a chinese knock off which is an OBDStar iScan Ducati. It can read all of the sensor values on the bike in real time. With something like that, you could record all of the sensors during the dyno run to get a better idea of what's going on.
Thanks! I'll ask the shop. But if a sensor can show something is wrong, wouldn't that trigger an error code?
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Maybe, maybe not. It's hard to know because it only occurs at about 8,500 RPM. I don't know how often the bike is looking for errors or bad sensor values, and at what RPM that would happen at. Could be all of the time, could be on start up and idle. More information is always better than less. You may see something you may not, but under the circumstances I think it's worth a try.
It's almost the exact same RPM. Very strange.
On the dyno do you have traction and wheelie control turned to the lowest setting or off?
I even used my OBDStar to reset the pin code on my bike. That saved me a trip to the dealer for sure. Since your bike is a 2018 it is fully supported. OBDStar is typically two years behind the current model for full compatibility.
It's almost the exact same RPM. Very strange.
On the dyno do you have traction and wheelie control turned to the lowest setting or off?
I even used my OBDStar to reset the pin code on my bike. That saved me a trip to the dealer for sure. Since your bike is a 2018 it is fully supported. OBDStar is typically two years behind the current model for full compatibility.
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No engine lights? Do you trust the Ducati dealer?
There seems to be a raft of bikes with fuel pump/fuel filter issues lately. Maybe your filter is dirty or the pump isn’t running optimally.
Does DDS or OBDStar have fuel pump voltage/amp values that you can cross check?
Could also be an issue with the secondary injectors. Maybe check the injector flow and make sure the tubing isn’t clogged
There seems to be a raft of bikes with fuel pump/fuel filter issues lately. Maybe your filter is dirty or the pump isn’t running optimally.
Does DDS or OBDStar have fuel pump voltage/amp values that you can cross check?
Could also be an issue with the secondary injectors. Maybe check the injector flow and make sure the tubing isn’t clogged
Yes... The problem is there with or without the aids switched off. Even QS off.
Hi SD...
No error codes. Tanks/fuelpump/filter has been tested twice by two different workshops. Was mentioned on previous page and was not the problem.
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Any chance you have the AFRs on the dyno runs?
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The bike measures fuel pressure and fuel flow.
I don't have the AFRs. They only connected the diagnostics when testing the throttle control on the Dyno. I have to assume they know what they are doing and that the diagnostic tool is not giving them any answers. And this concurs with why Ducati wasn't able to get any read on the problem either.
Fuel injectors are being tested now but I'm not very hopeful. Spark plugs after that.
Could it be something serious like the valve springs or valve clearance?
Again, Thanks for all your input!
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you don’t have valve springs in your motor.
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Did they test to see that the throttle grip when it’s rotated through its full range will output the correct voltage? It’s an electronic throttle, when you twist the grip a voltage level is generated and sent to the ECU as a throttle input. I suppose it’s possible that the throttle twist mechanism has gone bad, and won’t send out the right voltage to indicate a higher rpm level. They need to datalog this somehow. A good diagnostic tool should be able the read out what the throttle position sensor is outputting.
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If it were valve clearance, it would just run crappy throughout the rev range.
Has the intake trumpet assembly ever been off? That has a stepper motor that adjusts intake length relative to rpm. I’d assume that it would throw a code if that was the case but
Has the intake trumpet assembly ever been off? That has a stepper motor that adjusts intake length relative to rpm. I’d assume that it would throw a code if that was the case but
Yea that was the first thing they tested and even changed but no difference.
If it were valve clearance, it would just run crappy throughout the rev range.
Has the intake trumpet assembly ever been off? That has a stepper motor that adjusts intake length relative to rpm. I’d assume that it would throw a code if that was the case but
Don't know about the trumpet assembly. Yeah feels like all electronically moving parts should trigger a code if not working properly, similar to the exhaust valve.
Hope to get an update soon on the injectors.
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