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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04-15-2021, 03:02 PM | #44 | |||
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Quote:
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. Quote:
I don't think anyone here specifically wants to see every single number during the acceleration. I'm sure 10–20 Hz data refresh rate will be enough for everybody on this forum. Quote:
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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04-15-2021, 03:27 PM | #45 | |
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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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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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04-15-2021, 03:47 PM | #46 | |
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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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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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04-16-2021, 04:05 PM | #48 | |
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Quote:
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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04-16-2021, 04:15 PM | #49 |
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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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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 isn’t physically moving a needle.
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04-17-2021, 10:21 AM | #51 | |
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Hoping this is a pre-production version... |
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04-17-2021, 10:44 AM | #52 |
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Sounds like you’ll have to look for a different car that has the exact digital speedo smoothing rate you want. Good luck.
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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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04-17-2021, 11:26 AM | #54 |
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04-17-2021, 01:55 PM | #55 | |
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Quote:
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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04-18-2021, 07:54 AM | #56 | |
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Quote:
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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