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Old 04-15-2021, 11:08 AM   #43
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I also did not like the second speedo either as it is skipping many numbers and holding for a very long time. The other difference between the old and new is the type of readout. the old were red led's and had a slower rate and were not darkening as quickly.
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Old 04-15-2021, 03:02 PM   #44
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Just because it doesn't skip doesn't mean it's accurate. Increases in velocity are not necessarily linear. If you go from 0 to 60MPH in 3 seconds that does not necessarily mean you pass through every xMPH in between 0 and 60MPH.
With a 60 Hz display (commodity) you can show every single mph number during a one second 0Ė60 launch.
That's way faster than even a Tesla Roadster.

Even in km/h you can show every single km/h number in a 1.7s 0-100 km/h launch.

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you need to eat up cycles covering all the number between 0 and 10, so that by the time you show the 10, you have already accelerated past it, and the display is lagging.
Do the math and estimate what rate of acceleration is required to "lag" behind a 0...10 count?

I don't think anyone here specifically wants to see every single number during the acceleration.
I'm sure 10Ė20 Hz data refresh rate will be enough for everybody on this forum.

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However, if at the same time you are using an analog gauge, it will appear to go through each phase out of necessity [...] Now mind you we may be talking microseconds differences here, but there is a difference and programming choice has to be made.
Are you sure there's no latency in how an analog gauge works?
Any sensor, whether analog or digital, will have a certain "response time",
and then the needle in the gauge also has some inertia.

We are indeed talking about micro- or milliseconds here, and honestly I don't
think there's enough evidence to say whether analog or digital is going to be
more responsive. When was the last time you've seen an analog gauge in
an F1 car? Those guys surely care about both precision and latency.

There's nothing particularly inferior about what you can see on digital gauges,
other than just mediocre software engineering in this particular implementation.
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Old 04-15-2021, 03:27 PM   #45
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Are you sure there's no latency in how an analog gauge works?
I didn't intend to say there was no lag in an analog gauge, only that it can't "skip" numbers so it appears to show smooth measurement even though it may not be.

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We are indeed talking about micro- or milliseconds here, and honestly I don't think there's enough evidence to say whether analog or digital is going to be more responsive.
My note was strictly about the programming of the digital display not comparing analog to digital.

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There's nothing particularly inferior about what you can see on digital gauges, other than just mediocre software engineering in this particular implementation.
That was my point, its all down to the software, but that producing what appears to be a smooth increase in velocity on the speedometer does not mean it is any more accurate than the less smooth "skip number" method, and in the right circumstances could actually be less accurate.
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Old 04-15-2021, 03:47 PM   #46
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... producing what appears to be a smooth increase in velocity on the speedometer does not mean it is any more accurate than the less smooth "skip number" method, and in the right circumstances could actually be less accurate.
That would be a correct point if the underlying data was only 2 Hz,
the digital display was already doing the best it could do,
and we were talking about artificial smoothing.

But as I mentioned above, the data from the sensor is transmitted digitally at 50 Hz.
As this data is used by the ESC and ABS systems, I'm sure it's pretty high resolution both when it comes to timing and readings.
Based on a lot of data I collected at the track, it is definitely good enough to be displayed at 10+ Hz.
So they could totally avoid skipping numbers without introducing any artificial delays due to smoothing.
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Old 04-16-2021, 02:55 PM   #47
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Based on GPS data, my digital speedo is consistently 1 mph fast and my analogue is about 2 fast (GPS says I'm going slower than car indicates), so "eh". Even when I'm flying I'm held to +/- 5 kts. Anything closer than that is showing off

What I'm saying is: I've yet to hear why this refresh rate matters in any remotely practical way.
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Old 04-16-2021, 04:05 PM   #48
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Based on GPS data, my digital speedo is consistently 1 mph fast and my analogue is about 2 fast (GPS says I'm going slower than car indicates), so "eh". Even when I'm flying I'm held to +/- 5 kts. Anything closer than that is showing off .
That's about normal.

US regulations require the speedo to be accurate to within +- 5 MPH at 50MPH. However, UK and some other countries say the speedometer cannot show you going slower than your actual speed.

Because of this most cars have a bias where your speed is under-reported.
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Old 04-16-2021, 04:15 PM   #49
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Based on GPS data, my digital speedo is consistently 1 mph fast [...] I've yet to hear why this refresh rate matters in any remotely practical way.
As long as it is consistently off (based on my experiments, it is consisten), it can still be used as a pretty good reference when track driving.
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Old 04-17-2021, 09:33 AM   #50
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This has probably already been said but the current analog gauge is actually digital and driven off the same CANbus data that the new gauge will be. If anything I would think the new gauge would have less lag because it isnít physically moving a needle.
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Old 04-17-2021, 10:21 AM   #51
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This has probably already been said but the current analog gauge is actually digital and driven off the same CANbus data that the new gauge will be. If anything I would think the new gauge would have less lag because it isnít physically moving a needle.
If you look Here and zoom in, you can see a slow update of the instant speed, with no needle.

Hoping this is a pre-production version...
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Old 04-17-2021, 10:44 AM   #52
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Sounds like youíll have to look for a different car that has the exact digital speedo smoothing rate you want. Good luck.
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Old 04-17-2021, 11:00 AM   #53
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at that rate, it'd be easier to just run your own speedo cable off the drive shaft. every MFG is moving to canbus instrumentation because it's easier to implement, and allows them to run their own custom variation of code to protect odometer data. gauge refresh rate is an afterthought.
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Old 04-17-2021, 11:26 AM   #54
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Sounds like youíll have to look for a different car that has the exact digital speedo smoothing rate you want. Good luck.
Itís just a thread on a cons to pass the time waiting for more news.
Take it easy.

Iím still interested in buying it.
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Old 04-17-2021, 01:55 PM   #55
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If you look Here and zoom in, you can see a slow update of the instant speed, with no needle.

Hoping this is a pre-production version...

Oh sorry I was talking about the tach when the thread title says speedo. My mind said tach because who on earth would care about anything other than the tach.
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Old 04-18-2021, 07:54 AM   #56
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Quote:
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If you look Here and zoom in, you can see a slow update of the instant speed, with no needle.

Hoping this is a pre-production version...
Erm, not likely.

Its done on purpose (the rest of the display is real-time) to make it easier to read.

I can tell you that its very effective and not uncomfortable in practice - they strike a good balance.
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