A note on throttle spacers

[Alkhater]

Could be to avoid partial throttle opening during braking applications too.


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Just to be clear… I’m not a fan of the throttle slop, I have spacers installed on mine. I’m just throwing out an idea as to what may be behind Ducati logic.


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[endodoc]

You can fine tune throttle response in the software if you are so inclined to tinker with it

 

[Alkhater]

You can fine tune throttle response in the software if you are so inclined to tinker with it

That’s the proper way to do it imo.


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[Paul G]

Spacer wars lol!

I challenge anyone to show how having standard throttle freeplay affected their laptime.negatively.
This isnt a manufacturing defect, either in design or implementation, its on purpose. What I do know is that the TPS does not reset with the resting throttle position.

 

[Mick1976]

On the 99's the TPS resets every time the the ignition is turned on.

I challenge anyone to show how having standard throttle freeplay affected their laptime.negatively.
This isnt a manufacturing defect, either in design or implementation, its on purpose. What I do know is that the TPS does not reset with the resting throttle position.
[/QUOTE]

 

[Paul G]

are you sure about that Mick, when I reversed my throttle 180° which took out all the slop it would not start. Are you saying is that if you held the throttle half open and turned the key on, that position would now be reset to zero throttle?

Arguably the most important control on a bike is the throttle followed by the front brake. Ducati are not going to crown there very expensive flagship Superbike with a cheap and crappy throttle

 

[double0]

Maybe the ducati of old wouldn't have while on their way to bankruptcy but the new profitable company would and does.

 

[Paul G]

In the era of CAD, its it a few keystrokes to re-design and carry on production

 

[0260n25]

I think someone mentioned a possible reason for the play is to reduce manufacturing/inventory costs while complying with laws in multiple countries. I believe it is similar to the charcoal canister, which is installed on all USA Ducatis even though California is the only (pretty sure they are the only) state that requires the canister. This approach is what many car manufacturers use now rather than having a "California" model and then an "everyone else" model (Thanks CA for raising costs). Not everything is about safety or the "best" way to do something.

Either way, many people have them installed and use them without issues. I have them on my XDiavel and V2 and have no issues with throttle control or shifting. I love them. If you don't want them, don't buy them. If you install them and hate them, uninstall them. Simple.

 

[BP PanigaleV4S]

I doubt its a cost thing since its only a dimensional difference to have the grip fit tightly to the two lugs on the housing. I think its purely manufacturer preference. Other RBW homologated bikes don't have free play.

 

[endodoc]

are you sure about that Mick, when I reversed my throttle 180° which took out all the slop it would not start. Are you saying is that if you held the throttle half open and turned the key on, that position would now be reset to zero throttle?

Arguably the most important control on a bike is the throttle followed by the front brake. Ducati are not going to crown there very expensive flagship Superbike with a cheap and crappy throttle

Mick is correct. That info is in the DDS manual. When the key is switched the ECU does a POST and in the sequence the APS is synchronized to the TPS and throttle bodies but the APS/TPS is a known value voltage sync (0%, POT 1 1.011V for Siemens system)
(0% POT 1 0.505 for the Mits system) so having your throttle half open is not going change that however if you start the bike that way it will of course rev to whatever voltage the mechanical twist is providing.

As far as the throttle itself and the “flagship bike” comment, it’s the same throttle as on the 99s with different POT values for the Siemens ECU.
Throttle POT values:
Siemens POT 1 closed = 1.011v open = 4.566v
POT 2 closed = .505v open = 2.281v
Mitsubishi POT 1 closed = .505v open = 4.5v
POT 2 closed = .505v open = 4.5v

 

[BP PanigaleV4S]

@endodoc How did you get the DDS manual and is there one available for the V4?

 

[endodoc]

@endodoc How did you get the DDS manual and is there one available for the V4?

PM me

 

[0260n25]

I doubt its a cost thing since its only a dimensional difference to have the grip fit tightly to the two lugs on the housing. I think its purely manufacturer preference. Other RBW homologated bikes don't have free play.

Some companies reduce costs by simplifying inventory management. If some customers (i.e., countries or states) require a certain spec for a part (e.g., charcoal canisters or throttle play) it may be cheaper to supply all customers with the same part/spec rather than maintain multiple inventory groups. It is possible that Ducati chose to reduce costs by producing a single throttle that has play so as to satisfy some customers even if other customers prefer a tighter throttle. Inventory costs can and often do influence design, but Ducati would have to tell us if that is why they have play in their electronic throttles. My bet is on costs over safety.

 

[Paul G]

Mick is correct. That info is in the DDS manual. When the key is switched the ECU does a POST and in the sequence the APS is synchronized to the TPS and throttle bodies but the APS/TPS is a known value voltage sync (0%, POT 1 1.011V for Siemens system)
(0% POT 1 0.505 for the Mits system) so having your throttle half open is not going change that however if you start the bike that way it will of course rev to whatever voltage the mechanical twist is providing.

Thanks for the tech reply but Mick said "TPS resets every time the the ignition is turned on" which means something other than resetting the zero throttle position since that is a known value . Now I am curious, why did positioning the rheostat just of the stop cause it to not start? I'll clarify that as well, the throttle tube on the 1299 can be rotated so to pick up the lug on the rheostat in a manner which removes all freeplay, I did this when the spacer wars were all the rage a few years ago. Phil mentioned it in one of his posts that someone had success with it but it did not work for me.

Also I dont buy the narrative that this is a cheap piece of mass produced crap, everything is built to a price. If you want MotoGP or bespoke quality then you will need to pay MotoGP or bespoke prices. I have never had an issue with a Ducati throttle but plenty of people get enjoyment out of adding refinements or modifications to all aspects of the bike.