Will the Digital speedometer have a fast refresh?

[Sport-Tech]

Originally Posted by surfwaxsmitty

I hope that dyno display can be removed.

Would be nice, but at least it isn't embarrassing any more.

[Sasquachulator]

Originally Posted by surfwaxsmitty

I hope that dyno display can be removed.

well its one of several options, so just scroll past it and display something else instead.
Might not be removable, but you can choose never to show it lol.

[surfwaxsmitty]

Originally Posted by Sasquachulator

well its one of several options, so just scroll past it and display something else instead.
Might not be removable, but you can choose never to show it lol.

Awesome! thats the goal. I am only familiar with the early gen 1 cluster so was not sure if that was an option.

[Sasquachulator]

Originally Posted by surfwaxsmitty

Awesome! thats the goal. I am only familiar with the early gen 1 cluster so was not sure if that was an option.

in the gen 1 refresh uplevel cluster you get to scroll between the power/dyno chart, a G meter, lap timer, additional gauges (like oil pressure and battery charge), trip computer (for mpg, trip odo, etc)
Obviously the additional gauges or the trip computer items would be far more useful than the other stuff, so those would be the most likely to be shown all the time.

I think the gen 2 cluster scrolls through the same things on the left side with the right side having fixed temp and fuel gauges.

[ng-86]

Originally Posted by Sasquachulator

in the gen 1 refresh uplevel cluster you get to scroll between the power/dyno chart, a G meter, lap timer, additional gauges (like oil pressure and battery charge), trip computer (for mpg, trip odo, etc)

Hopefully the G meter isn't so hopelessly useless in North America like it is on my 2018 BRZ.

[timurrrr]

Originally Posted by Tcoat

Just how much time do some of you guys spend staring at your dash to even register gauge refresh rates?

The point is that for some people the responsive speedometer is important. If it's not important enough for you, that doesn't mean it's not important for everybody.

It's like some people have outdoor thermometers at home and some don't need them. "Seat of pants" and all that stuff.

Personally I think it's important for a speedometer to be precise not only in what speed they're showing, but when they're showing it. I don't care what speed I was going up to 0.25 seconds ago, I care about what speed I'm going now. If it's up to 0.25 seconds late, it also means that it's up to 3 mph wrong when I'm braking; whether on the track, or on a highway when I spot a police car.

[timurrrr]

But I do agree that this is not worth 8 pages of a discussion lol.

I just hope that it's ~10 Hz from the factory, or at least that someone comes up with an easy tweak for the software.

In the worst case, I'll try to I find time to make a DIY speedo with blackjack and HUDers.

[Lelandjt]

Originally Posted by Tcoat

"OH cop ahead"
.005 second glance at speedometer
"I'm good".

Unfortunately Colorado cops are much better at hiding and tend to do it on downhills and in acceleration zones. If I'm accelerating I'm watching the speedo out of the corner of my eye so I let off near the speed limit. Any time I'm driving along and not using cruise control I check it every 30 seconds or so. Too bad cops around here aren't as vigilant about turn signal use as speeding. They could probably make more money and I could relax and keep my eyes entirely on the road.

[p1l0t]

Originally Posted by Lelandjt

Unfortunately Colorado cops are much better at hiding and tend to do it on downhills and in acceleration zones. If I'm accelerating I'm watching the speedo out of the corner of my eye so I let off near the speed limit. Any time I'm driving along and not using cruise control I check it every 30 seconds or so. Too bad cops around here aren't as vigilant about turn signal use as speeding. They could probably make more money and I could relax and keep my eyes entirely on the road.

laser jammer and a radar detector?

Sent from my SM-G975U using Tapatalk

[Dake]

Originally Posted by timurrrr

The point is that for some people the responsive speedometer is important. If it's not important enough for you, that doesn't mean it's not important for everybody.

It's like some people have outdoor thermometers at home and some don't need them. "Seat of pants" and all that stuff.

Personally I think it's important for a speedometer to be precise not only in what speed they're showing, but when they're showing it. I don't care what speed I was going up to 0.25 seconds ago, I care about what speed I'm going now. If it's up to 0.25 seconds late, it also means that it's up to 3 mph wrong when I'm braking; whether on the track, or on a highway when I spot a police car.

I don't think anyone is arguing that it's not important to you. I believe what most people are still confused by is why it's so important to you.

You're talking about quarter-second accuracy on a display that is legally allowed to be off by as much as 4 mph. This is combined with the fact that in any spirited driving, the speedo is pretty much the last thing you need to be spending enough time staring at to determine that it's a quarter-second behind.

So yeah, we all like what we like and we all have our weird things and I'm down with that too. It's not about kink-shaming here. I'm still just trying to understand in what way this level of expected precision is a) necessary and b) actually noticeable in anything outside of a laboratory environment.

[timurrrr]

Originally Posted by Dake

You're talking about quarter-second accuracy on a display that is legally allowed to be off by as much as 4 mph.

The law is written for all cars.
I don't mind if a Camry I rent on a business trip has a digital speedometer with a slow refresh rate.

We're talking about a sport car though, that is advertised as being able to carry four spare tires for a track day.

Originally Posted by Dake

I'm still just trying to understand in what way this level of expected precision is a) necessary and b) actually noticeable in anything outside of a laboratory environment.

See above my comment on this thread a few pages ago: track driving.
When I track out from T6 at Laguna Seca and I see 78 mph on the speedometer, does it mean that
I've nailed that corner (that's a pretty decent exit speed for GT Radial SX2s I use in 86DC) or does it
mean it's still showing the speed I had before the corner?

Any learning process accelerates by having high quality positive/negative reinforcement delivered ASAP
(as opposed to data analysis after the session, or even at home). When it comes to track driving, in
in certain types of corners the exit speed is a very high quality signal. Definitely higher quality than seat
of pants of most people I've talked to, if we exclude for very experienced track drivers and actual racers.
In some longer corners (such as T2 at Thunderhill), knowing your typical speed can help quickly you
sanity-check how close your are (or the driver is, if you're the coach) to the limit.

[Dadhawk]

Originally Posted by timurrrr

The law is written for all cars.
I don't mind if a Camry I rent on a business trip has a digital speedometer with a slow refresh rate..

The legal accuracy has nothing to do with refresh rate, as I explained earlier. A vehicle on the road is legally required to NOT show you driving slower than you are actually going, so manufacturers intentionally build in a bias that shows you going faster than you are.

You then have, on top of that, the fact that your speedometer is likely calibrated for a medium-wear tire of the size shipped on your car. This introduces further error.

So, in the end, all a faster refresh rate give you is the approximate speed at a theoretical faster rate.

But hey, you want what you want, and I hope you get it. I'd be good with a faster rate as well, but I truly had never thought about it until you brought it up.

[Dake]

Originally Posted by timurrrr

The law is written for all cars.
I don't mind if a Camry I rent on a business trip has a digital speedometer with a slow refresh rate.

We're talking about a sport car though, that is advertised as being able to carry four spare tires for a track day.



See above my comment on this thread a few pages ago: track driving.
When I track out from T6 at Laguna Seca and I see 78 mph on the speedometer, does it mean that
I've nailed that corner (that's a pretty decent exit speed for GT Radial SX2s I use in 86DC) or does it
mean it's still showing the speed I had before the corner?

Any learning process accelerates by having high quality positive/negative reinforcement delivered ASAP
(as opposed to data analysis after the session, or even at home). When it comes to track driving, in
in certain types of corners the exit speed is a very high quality signal. Definitely higher quality than seat
of pants of most people I've talked to, if we exclude for very experienced track drivers and actual racers.
In some longer corners (such as T2 at Thunderhill), knowing your typical speed can help quickly you
sanity-check how close your are (or the driver is, if you're the coach) to the limit.

Right. I'm saying the chances that you look at the speedo in that exact quarter second and that it makes any significant difference over all are negligible. You may be just that good, but we're not talking Formula 1 here.

[timurrrr]

Originally Posted by Dadhawk

... your speedometer is likely calibrated for a medium-wear tire of the size shipped on your car. This introduces further error. So, in the end, all a faster refresh rate give you is the approximate speed at a theoretical faster rate.

Yeah, but as long as your reference speed was set on similarly-worn tires (e.g. previous lap), it doesn't matter if both are off by X%.
I don't think a bald tire vs new tire will generate more than 1 mph off up to ~100 mph.

I actually did check my speedo against GPS a few times when debugging some other data longs,
along with the underlying data sent over the OBD and CAN bus.
Surprisingly on that occasion it was 100% accurate when driving at constant speed on a straight flat highway.
I'm not talking about a single sample, I'm talking about hundreds of samples across multiple drives on different sets of same spec tires.