Hi Guys I use my v4 100% for track-days and have been riding it on track from new since 2019 Apart from water pump issues, its been flawless. I now have 2 issues:- 1. Engine braking level changing at low speed/rpm. I always have this set to 3 - less engine braking. When approaching 2nd gear corner/hairpins - the bike approaching the apex and the engine braking will suddenly go from nothing to maximum right when your over on the edge of the tyre. This caused a front low-side at Jerez 2nd corner last year when the additional engine braking over loaded up the tyre. This weekend at Portamao, even after performing a tyre recalibration (just in case it had anything to do with the front/rear wheel sensors) - I still have the same issue and have to hold the throttle open slightly or just don't lean so far over. I cant figure out what is triggering this odd behaviour as i have never had this issue before. 2. Quick-shifter surging on upshift (race shift) This has always been fine in the past, before i had it annually serviced this year, now it seems there is a timing delay issue as it surges quite violently when up shifting, but is fine on the down shift Is there anyway to do a QS calibration on the v4 or is it a dealer job ? Anybody have any ideas on either of the above issues ??
Has this started following a dealer service where they may have potentially updated the firmware/mapping??
The Engine Braking issue started to be noticed last year The QS issue definitely after this years service
The QS behaviour change most likely linked to a firmware change. The engine breaking change sounds downright dangerous. Does your pPani have a CAT ?
Q: Ducati’s engine breaking reduction is achieved by putting a small amount of fuel in to the chamber when the throttle is closed? Have you a throttle spacer to take out the play? (one synopsis could be the spacer is possibly making the TPS read a value > than expected)
I noted on my 1299 with the engine braking set to as little as poss would add a pulse, like a run on just as i was tipping in.
From my understanding of how engine braking works, it should be stronger(more noticeable) at high revs and weaker at low. As is being said elsewhere on the thread, if you run low engine braking you could experience a “push” at low speed. If your engine braking came in stronger at low revs it would cause a “load” at the rear not the front! So the back would lock-up maybe? if it’s the opposite and it reduces by feeding a bit of fuel in (most noticeable if set in 3) then it would push the front. Try it in all 3 levels and see what you feel. The QS surge is possibly caused by bad foot position. Either just yourself if you’ve changed boots maybe, or the qs adjustment may have come loose and moved the lever a bit. Effectively your foot is not “releasing” the qs.
The QS issue has been diagnosed as a faulty qs by Ducati I do wonder if you can buy the cherry microswitch from somewhere rather than £285 for a complete unit !!! My results by Ducati 2.5v idle 3.19686v up 1.69529v down They couldn't find anything wrong with the ebs system or throttle bodies , so will learn to ride around it, or try a bigger rear sprocket on the rear to increase the rpm or even change it to level 1 and get used to it I think the front wheel explanation maybe that it is putting weight on the rear when leant right over, knee down, and taking weight from the front which caused the release of grip from the front , its either one of those, but a weird experience for sure. Also just to clarify, the ebs system works by letting AIR in the TB not FUEL as I understand from Ducati. This system was present on my MV 312R in 2008 ;-)
Maybe consider swapping to a HM Quickshifter. More expensive but (allegedly) much better quality. They do direct replacements for the OEM fitting https://hmquickshifter.com/
