Fly by wire speed control in curves
Thread Starter
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Stage III
Joined: Apr 2020
Posts: 3
Likes: 1
From: Utrecht
Fly by wire speed control in curves
Hi,
I own a 2008 Road King with fly-by-wire injection. I love the bike but find it hard to control in taking curves. Especially when the bike hangs over (not sure that is good English :-) ) i a curve I like to have smooth control of the throttle However in the lower range dosing the throttle is hard. it feels like it jumps up in steps rather than an straight line. that makes the bike shock and extra challenging to take curves. Anyone has had the same experience? is it an adjustment issue or as designed?
Thanks,
Ron
I own a 2008 Road King with fly-by-wire injection. I love the bike but find it hard to control in taking curves. Especially when the bike hangs over (not sure that is good English :-) ) i a curve I like to have smooth control of the throttle However in the lower range dosing the throttle is hard. it feels like it jumps up in steps rather than an straight line. that makes the bike shock and extra challenging to take curves. Anyone has had the same experience? is it an adjustment issue or as designed?
Thanks,
Ron
HDF Community Team
Joined: Nov 2012
Posts: 6,191
Likes: 2,421
From: USA
FWIW, Ive three different vehicles, with throttle by wire. They all respond very differently.
The Saab is an off-idle dog. You have to nearly floor this car to make it go. Well known problem with them.
The Toyota is the complete opposite. Its so explosive off-idle that driving it in the rain or off-road is difficult. All the worse if one has been driving the Saab.
The Volvo behaves in a perfectly reasonable and linear fashion.
So no answer, just an observation that they are not all the same, by any means. There are various trimmers one can patch inline between the throttle control and the ecu. Quality of these varies. Almost none of the tunes to an ecu adjust response to the input.
The Saab is an off-idle dog. You have to nearly floor this car to make it go. Well known problem with them.
The Toyota is the complete opposite. Its so explosive off-idle that driving it in the rain or off-road is difficult. All the worse if one has been driving the Saab.
The Volvo behaves in a perfectly reasonable and linear fashion.
So no answer, just an observation that they are not all the same, by any means. There are various trimmers one can patch inline between the throttle control and the ecu. Quality of these varies. Almost none of the tunes to an ecu adjust response to the input.
Tourer
Joined: Sep 2011
Posts: 456
Likes: 205
From: Manchester, MI
The throttle sensor output is linear and you cannot change that. There is nothing you can plug in between the sensor and the ECU to change that. The way the engine or vehicle, whether a car or a motorcycle, responds is based on many factors. The engine configuration determines the power curve. Gearing in the vehicle is another factor.
I don't know if the sensor in your grip is Hall-Effect or contact. I was under the impression that Harley went from cable to Hall Effect throttle by wire.
I don't know if the sensor in your grip is Hall-Effect or contact. I was under the impression that Harley went from cable to Hall Effect throttle by wire.
Last edited by jimglassford; Apr 23, 2020 at 06:29 AM. Reason: added to the post
Thread Starter
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Stage III
Joined: Apr 2020
Posts: 3
Likes: 1
From: Utrecht
That is what I do but that doent allow me a smooth acceleration in and after the curve...but it does work better, I agree
Tourer
Joined: Sep 2011
Posts: 456
Likes: 205
From: Manchester, MI
I checked the part number and it is the same for multiple years (32305-08B). It is Hall-Effect so there is nothing wrong with the sensor in the throttle. With a hall effect sensor, it either works or it does not. It is just a characteristic of the motorcycle and riding style you have to deal with.
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Joined: May 2018
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From: PA
This is a good read and might be part of your issue. When I bought my 2008 he said the tbw issue has already been fixed. I didn't ask him what he meant but may have been the same thing.
https://www.hdforums.com/forum/touri...read-this.html
https://www.hdforums.com/forum/touri...read-this.html
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Thread Starter
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Stage III
Joined: Apr 2020
Posts: 3
Likes: 1
From: Utrecht
Thanks, I will see if I can read-out the tables in the ECM to see what the values are in the first rows of throttle position sensor
I assume if I shift that a little, it should be smoother.... yeah I know I have to be carefull with that
I assume if I shift that a little, it should be smoother.... yeah I know I have to be carefull with that
Road Warrior
Joined: Aug 2018
Posts: 1,307
Likes: 926
From: Squamish, BC
The TBW sensor in the grip does wear over time. Mine was getting 'sticky' at lower rpm as well, I replaced it when I changed the bars and now it is smooth once again. Not cheap and not fun, but it may just solve your issue.