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Old Mar 21st 2019, 06:15 PM   #61
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I just finished installing my DDA GPS kit to my 2018 V4S. I have not yet track tested, but here is my experience.

1. I had my dealer activate the GPS sensor. They had to have it plugged into the bike to activate. I hadn't yet looked too closely at the mounting options, but it was easiest for me to get to the front plug at the shop by pulling my upper fairing off with some Dzus fasteners and two screws (I have all race glass on bike).
2. With the GPS sensor plugged in the front, I would get a grey icon on the dash that would flash while in my garage. If I unplugged the GPS sensor, that icon would go a solid non-flashing red.
3. After looking at the mounting options, I thought about mounting the sensor in the tail. However, I was unable to get the dash to recognize the GPS sensor when plugged in on the tail. Best I can guess is that when they activate the GPS sensor, it is specific to location, maybe something to do with CAN bus addressing? I am speculating out my wazoo here as I barely know enough about CAN bus to be dangerous.
4. I switched gears and then mounted the GPS sensor in the front nose on top of the intake air scoop that I have with the aftermarket fairing stay. I trimmed the provided bracket so it sits flush. The sensor is on an angle, but I don't anticipate that creating an issue (famous last words).
5. I then used the other bracket and rubber strap piece and mounted that external in the tail so I can now access the diagnostic port easily, and plug in the DDA unit easily without removing anything. And it is tucked up out of the way. Again all, aftermarket race tail.
6. To do this, I only used two of the three provided wire connectors.
7. Once I get on track later in year, I'll report back on how it works.
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Old Apr 2nd 2019, 07:05 PM   #62
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Originally Posted by Rooki View Post
I just finished installing my DDA GPS kit to my 2018 V4S. I have not yet track tested, but here is my experience.

1. I had my dealer activate the GPS sensor. They had to have it plugged into the bike to activate. I hadn't yet looked too closely at the mounting options, but it was easiest for me to get to the front plug at the shop by pulling my upper fairing off with some Dzus fasteners and two screws (I have all race glass on bike).
2. With the GPS sensor plugged in the front, I would get a grey icon on the dash that would flash while in my garage. If I unplugged the GPS sensor, that icon would go a solid non-flashing red.
3. After looking at the mounting options, I thought about mounting the sensor in the tail. However, I was unable to get the dash to recognize the GPS sensor when plugged in on the tail. Best I can guess is that when they activate the GPS sensor, it is specific to location, maybe something to do with CAN bus addressing? I am speculating out my wazoo here as I barely know enough about CAN bus to be dangerous.
4. I switched gears and then mounted the GPS sensor in the front nose on top of the intake air scoop that I have with the aftermarket fairing stay. I trimmed the provided bracket so it sits flush. The sensor is on an angle, but I don't anticipate that creating an issue (famous last words).
5. I then used the other bracket and rubber strap piece and mounted that external in the tail so I can now access the diagnostic port easily, and plug in the DDA unit easily without removing anything. And it is tucked up out of the way. Again all, aftermarket race tail.
6. To do this, I only used two of the three provided wire connectors.
7. Once I get on track later in year, I'll report back on how it works.


So have you tested your setup yet?
Everything works?
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Old May 28th 2019, 11:37 PM   #63
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Cabling...
I trying to fit my DDA kit to a V4S with the original fairing and with the
tail guard from Rizoma. The kit comes with 3 peaces of cabling. One is obvious
because it's the extension to be able to have the stick where it should be. But the
other 2 is my headache. Is it meant that both cables should be used or is one
of them to be used if you don't have any lights on the bike?

I have also kind of hard to see that all cabling will fit in the small compartment
there is in the back of the bike. It was already hard to get the cables from the
Rizoma tail guard to fit.

Anyone know how it's done on a speciale? or have actually installed both a Rizoma tail guard and a DDA kit to a V4?
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Old Jul 25th 2019, 08:07 AM   #64
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Hi Guys,
Thanks for sharing real-life DDA experience here, since both prosa.com, DDA+ installation instructions and my V4s manual are quite basic, to put it mildly, refraining from clear, practical user instructions.

Using *.dda data for analysis after a normal street ride looks promising. I will need to find a way to export DDA data to join it with GoPro movie as overlay.

Somewhere on this forum I read about somebody who created an Android app to convert this?

Anyway, I was wondering if anybody knows the sampling rate of the DDA+ GPS module for the V4 for a fact?

Judging from the Ducati Link app using the 1Hz GPS of iPhone:



versus the more granular DDA Graphic Analyser data view of same corner:



…it looks like the DDA-GPS is still only around 5Hz.

I can imagine that if is indeed less then 10Hz this could very well be the problem of the DDA missing out of start-finish markers on (fast) straights: it simply overshoots your set lapmarker on high speed passings, before it is even able to recognise the set marker!

Originally Posted by thorny View Post
...If you set the reference GPS point/location in an easy corner apex that is easy to hit close every lap ..., it will be counting laps without any issues.
If you set it on the front straight, where you normally overtake people (on the V4, you WILL be overtaking people on the front straight!), it will not click off laps, so don't do it. It is a bit annoying, but not a big deal for me.
That's why Thorny practically set it to a slow apex instead to enable to allow the DDA-GPS to recognise the lapmarker and count the lap properly.

I also use the 20Hz* VBox Sport and never had problem missing lapmarkers on usually fast start/finish straights, if I allowed my 20Hz GPS to initialise long enough with fixes to at least 6-8 satellites prior to a track-session.
(* - Racelogic recently 'downgraded' the 20Hz satellite sampling-rate of the VBox Sport to 10Hz only in favor of a more robust reception: link with reasoning)

Doing this 'religiously' is crucial to proper GPS logging operation.
How to: you must leave the active GPS module enough time in a fixed place with a clear view to the sky initially for at least 5 minutes at start of each day/ 24hrs and about 2min. before each session during the same day, to achieve sufficient sat fixes and quality logging.

If you don't, you potentially miss out on lapmarkers and with my VBox I loose perfect granular flowing track-logs to allow lap2lap racing line comparison.

Additional issues preventing proper sat fixes are rain, heavy overcast and nearby magnetic fields from the bikes engine/ wiring. On my previous track-bike I even shielded the fairing underneath my VBox with aluminum tape to protect the reception of generally weak satellite signals.

I am looking forward during my next track-day comparing the DDA+ GPS to my VBox GPS!

Hope these practical tips help your DDA experiences?

Last edited by RdashP; Aug 8th 2019 at 06:37 PM.
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Old Jul 26th 2019, 12:07 PM   #65
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FYI carbon fiber blocks phone and gps signals. I bought a carbon fiber phone cover a few years ago and was having trouble with weak signals everywhere. Did some research took the cover off and problem solved. Got my money back too..... Why they even made them was beyond me

Now have a Kevlar cover with a similar look but no signal issues


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Old Aug 8th 2019, 11:09 AM   #66
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Originally Posted by MotoX183 View Post
I would think you would want clear line-of-sight for the GPS module for best performance. Installing in the tail would seem to hinder that a bit, yeah?
Indeed. Leaning over into/ towards the cockpit especially on the straights, a front mounted GPS antenna would have on par or even slightly less LoS compared to a tail-mounted satellite antenna:



Estimating the satellite receiver of the DDA(+) is only sampling at around 5Hz it needs all the LoS for as many satellite locks it can get to log tracks meaningful w.o. choppiness/ corner-cuts.

Practically at least a 6-8 sat-locks I would think.
This effectively means giving the receiver minimally unobstructed ~180o LoS (i.e. w.o. sitting on the bike!) for at least a few minutes before riding away for the track as explained in my previous lengthy post.

Last edited by RdashP; Aug 8th 2019 at 01:53 PM.
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Old Aug 8th 2019, 12:18 PM   #67
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Originally Posted by 1050er View Post
Yes, you're basically right. I think i will try the nose mounting tomorrow [...] That's why i considered the tail mounting option.
But as i wrote above, it did not work, no GPS signal...
Front- or tail-mount shouldn't matter too much for satellite reception quality, looking at available LoS with rider's body in race position blocking similar angled areas from the sky:


Last edited by RdashP; Aug 8th 2019 at 02:20 PM.
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Old Aug 8th 2019, 12:19 PM   #68
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Originally Posted by Trackmaniak View Post
... It seem like carbon fiber blocks the signal
[...] I tried the carbon fiber section again and GPS signal was not working .... again.
I'm pretty sure that's the reason why Ducati offers 2 locations for the GPS sensor, In case you use a carbon fiber bodywork ...
Indeed. Here's why:
"No, carbon fiber cannot be used as an antenna cover. [...] The RF signal will not pass through carbon fiber easily. Fiber glass, [...] can be used as an alternative."

In fact, make sure anything else which is diverting/absorbing/obstructing the weak satellite signals like (rain)clouds, vegetation, buildings, magnetic-fields (engine/ wiring!) is worked around where you can AND you provide ample 'initialisation' time for static satellite locks (>=6) prior to racing.

Last edited by RdashP; Aug 8th 2019 at 12:22 PM.
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Old Aug 8th 2019, 12:20 PM   #69
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Originally Posted by stealthblack View Post
GPS signal acquisition is almost immediate after Key turn on my R
Only true if properly initialised as explained above, else you get only a few satellite locks with strongest LoS signals but you easily loose them again during tracking around and therefore this is NOT sufficient for (smooth) track-logging as explained above.

Last edited by RdashP; Aug 8th 2019 at 02:18 PM.
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Old Aug 16th 2019, 12:19 PM   #70
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Originally Posted by RdashP View Post
Hi Guys,
Thanks for sharing real-life DDA experience here, since both prosa.com, DDA+ installation instructions and my V4s manual are quite basic, to put it mildly, refraining from clear, practical user instructions.

Using *.dda data for analysis after a normal street ride looks promising. I will need to find a way to export DDA data to join it with GoPro movie as overlay.

Somewhere on this forum I read about somebody who created an Android app to convert this?

Anyway, I was wondering if anybody knows the sampling rate of the DDA+ GPS module for the V4 for a fact?

Judging from the Ducati Link app using the 1Hz GPS of iPhone:



versus the more granular DDA Graphic Analyser data view of same corner:



…it looks like the DDA-GPS is still only around 5Hz.

I can imagine that if is indeed less then 10Hz this could very well be the problem of the DDA missing out of start-finish markers on (fast) straights: it simply overshoots your set lapmarker on high speed passings, before it is even able to recognise the set marker!


That's why Thorny practically set it to a slow apex instead to enable to allow the DDA-GPS to recognise the lapmarker and count the lap properly.

I also use the 20Hz* VBox Sport and never had problem missing lapmarkers on usually fast start/finish straights, if I allowed my 20Hz GPS to initialise long enough with fixes to at least 6-8 satellites prior to a track-session.
(* - Racelogic recently 'downgraded' the 20Hz satellite sampling-rate of the VBox Sport to 10Hz only in favor of a more robust reception: link with reasoning)

Doing this 'religiously' is crucial to proper GPS logging operation.
How to: you must leave the active GPS module enough time in a fixed place with a clear view to the sky initially for at least 5 minutes at start of each day/ 24hrs and about 2min. before each session during the same day, to achieve sufficient sat fixes and quality logging.

If you don't, you potentially miss out on lapmarkers and with my VBox I loose perfect granular flowing track-logs to allow lap2lap racing line comparison.

Additional issues preventing proper sat fixes are rain, heavy overcast and nearby magnetic fields from the bikes engine/ wiring. On my previous track-bike I even shielded the fairing underneath my VBox with aluminum tape to protect the reception of generally weak satellite signals.

I am looking forward during my next track-day comparing the DDA+ GPS to my VBox GPS!

Hope these practical tips help your DDA experiences?
Would you know how to delete/erase a finish line from the GPS/DDA ?
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