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Old 08-10-2007, 07:32 PM
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Question 1098S, Ducati Data Analyzer

Hi there,

The DDA system is quite fun to look at after a ride. The measured parameters (speed, water temp, etc) are quite obvious but I have some difficulties with the parameter "gear".
Any ideas about what the gear graph (rounds/km) is supposed to represent? Most of the time it shows values between 5.7 and 5.9 rounds/km (see screenshot).

Lets'go for brainstorm
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Old 08-10-2007, 07:58 PM
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Number of gear changes per Km?
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Old 08-10-2007, 08:02 PM
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Calculated overall gear ratio?
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Old 08-10-2007, 08:31 PM
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Looks like no Quickshift-System.
Sample rate of distance looks like 1/30 hz ,Temp 1/10 Hz ,Speed and Throttle I'd think its 20-50 Hz.
Dont know how much Time of Logging is inside the ECU of the 1098.
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Old 08-10-2007, 08:44 PM
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the temp graph is odd, i don't ever remember seeing a smooth temp like that in anything i've worked on (without a whole lot of curve-fitting)

could that be the gear one?
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Old 08-10-2007, 09:26 PM
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I like the one with the overall gear ratio.
That would produce following numbers:
6th gear: 24/23 (6th gear) * 59/32 (primary) * 38/15 (final) = 4.47
5th gear: 23/24 (5th gear) * 59/32 (primary) * 38/15 (final) = 4.87
4th gear: 22/26 (4th gear) * 59/32 (primary) * 38/15 (final) = 5.52
3rd gear: 20/28 (3rd gear) * 59/32 (primary) * 38/15 (final) = 6.53
2nd gear: 17/30 (2nd gear) * 59/32 (primary) * 38/15 (final) = 8.24
1st gear: 15/37 (1st gear) * 59/32 (primary) * 38/15 (final) = 11.52
If one would use mostly 3rd to 5th gear, that could produce some average numbers between 5 and 6.
Maybe I'll try to record a portion of highway with more than 1km with the same gear.
By the way there should be 3 hours recording available on the stick.
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Old 08-10-2007, 09:39 PM
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Quote:
Originally Posted by Aducated View Post
I like the one with the overall gear ratio.
That would produce following numbers:
6th gear: 24/23 (6th gear) * 59/32 (primary) * 38/15 (final) = 4.47
5th gear: 23/24 (5th gear) * 59/32 (primary) * 38/15 (final) = 4.87
4th gear: 22/26 (4th gear) * 59/32 (primary) * 38/15 (final) = 5.52
3rd gear: 20/28 (3rd gear) * 59/32 (primary) * 38/15 (final) = 6.53
2nd gear: 17/30 (2nd gear) * 59/32 (primary) * 38/15 (final) = 8.24
1st gear: 15/37 (1st gear) * 59/32 (primary) * 38/15 (final) = 11.52
If one would use mostly 3rd to 5th gear, that could produce some average numbers between 5 and 6.
Maybe I'll try to record a portion of highway with more than 1km with the same gear.
By the way there should be 3 hours recording available on the stick.
Hi about starting the recording before you move. Accelerate up in all gears to 6:th gear and decellerate down to first gear and look how it looks. You might found your all your gears then on the graf then.

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Old 08-10-2007, 10:11 PM
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It is gear position. If you look at the rpm trace you will note that it is in rounds per min. "rounds" are revolution. Rounds per km is engine revolutions per km basically, that is how most (if not all) data acq systems sense gear position without a gear drum potentiometer.

Also the temp is stair-stepped like that b/c the sampling rate is slow. It is actually varying as you would reasonably expect it would.

Will the DDA display the data in distance domain, rather than time domain as your post shows?
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Old 08-11-2007, 01:56 AM
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Quote:
Originally Posted by desmo11 View Post
It is gear position.
Nahh, doubt it - unless it thinks there's a gear between 5th and 6th called "5.86" in the box at that point-in-time vertical line of values.
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Old 08-11-2007, 03:33 AM
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It's gear dude. Don't necessarily pay attention to the numerical value. Look what the engine speed is doing, you can see where he is going through the gears, and yup there's step changes in the 'gear' parameter.

Aducated, did you change the gear ratio on the bike? Or is there a gear ratio entry in the software? And based on your speed trace you were shifting it like a tractor or maybe a Harley! Get on it man! Were ya trying not to spill your Starbucks or something?!
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Old 08-11-2007, 03:45 AM
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Ok, you think it's gear, I think it's gear ratio. If it was gear, there would be 6 clear and level steps on the log, and the numeric value would be integer, not fractional. Who REALLY knows?

EDIT: OK, it's not a simple gear ratio as I thought - otherwise it would reduce as the motor went through the WFO gear changes, not increase. My bad!
(But I still don;t think it's direct gear number )
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Old 08-11-2007, 09:07 AM
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Desmo11! It would nice if I could take some starbucks on board: I think the USB-stick is the only thing which fits in the backseat! I'm still running'in the baby so that's why the rev limiter has not been busy lately .
The gear ratio is standard and the software only allows to change the way the graphs look like (zoom, switch parameters on/off, etc). It's not possible to show the data in distance domain.
Anyway, we're getting closer to the thing. I will check on prosa's homepage (programmer of DDA) if there is additional hints.
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Old 08-11-2007, 06:39 PM
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OB, I see what you mean. Yes, of course it's not the correct gear #, but I think it's meant to be. The whole RPM/km thing is a common way to back out gear. I think they just boned the #. Not that the Italians would screw something up at launch....

Addy, unfortunately it doesn't look like there is a way to tune the stock ECU, but looks like the mmcompsys.com nemesis ecu has come out. Looks pretty cool for a plug-in ecu... Looks like they have some more software work to do though for the 1098.
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