dean29

I called American Honda today to ask about variance in the speedometer. They told me that the speedometer could only read above the actual speed you are going and never below.

I think this is BS myself as it seems like there is a lag when accelerating. Anyone ever tested the S2000 against a radar gun especially during periods of rapid acceleration?

Thanks,
Dean

Lips2000

Testing with my GPS unit seems to back up their claim. The GPS will read 100 mph and the speedo indicates my speed to 103 mph. Faster than I am really going. For the record: It's a known issue about the speedo's error. My testing revealed a 2.7% error factor from 50mph on up. Even in reverse!!

Mark

Swurvydel

thank you for that bit of information...now i will speed 3 miles over the speed limit =)

dean29

Lips2000:

Thanks for the idea. I do have a portable GPS at the house. I can check the speed with it.

However I did notice in my previous car that there appeared to be a little lag on the GPS speed calculation although I will do some testing to see.

Dean

scooby2

Why should we assume that tracking with a gps would be a good indicator of actual speed? According to the Garmin website, and I have a consumer quality Garmin, relative positional accuracy for their units is +/- 15 meters or 49 feet. This alone could account for the difference between speedometer and gps reading.

Tanqueray

Also, my pet peeve with the speedo is that it is doing a sampling or averaging algorithm, so it doesn't update continuously. At the track, accelerating hard down a straight, it will read 82, 86, 89, 92, etc. Are you saying that I am never going as fast as the speedo says, even though it is averaging the speed over some time period?

Tanq

TommyAmrani

so when a cop busts out w/that pointless question of,
"do you know how fast you were going?" right after he asks, "do you know why i pulled you over?"
should i answer,
A)"to get a better look at the car!"

B)"no sir, my speedometer is a bit off, you tell me!"

C)"60 if my speedo. read 63?"

Lips2000

You are correct, with respect to pinpointing your position, but if I am moving, the error plays less of a factor (assuming that the current position moves relative to the last known position). Basically, assume the error as a constant in both distance and direction. You would, then, get an accurate speed reading. Does this make sense to anyone with better verbal skills? Hope so...

Mark

Lips2000

[QUOTE]Originally posted by dean29
[B]

Lips2000

[QUOTE]Originally posted by Tanqueray
[B]Also,