Real MPH = variable

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Argee
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Posts: 44
Joined: Mon Sep 14, 2015 4:56 am
Location: SoCal

Real MPH = variable

Post by Argee »

I strapped my GPS on the Buddy 170i and recorded actual MPH from 20 to 65 BMPH. Not too bad at lower speeds, but drops off rapidly to over 5 mph too fast after around 60 bmph.

So, my top speed is...62.3 gps mph. No freeways for me.

NOTE: my tire pressure is a little higher than normal.

RAW DATA:
20 17.4 2.6
25 22.7 2.3
30 27.1 2.9
35 31.4 3.6
40 35.7 4.3
45 40.8 4.2
50 45.7 4.3
55 50.6 4.4
60 55.3 4.7
65 59.3 5.7
Indicated,GPS, & diff in MPH
Attachments
buddy speed error.pdf
graph of speed error from 20 to 65 bmph
(104.86 KiB) Downloaded 43 times
dasscooter
Member
Posts: 332
Joined: Sun Feb 14, 2016 7:01 pm

Post by dasscooter »

When my girlfriend rides the Buddy, she normally asks me how fast my '79 Vespa is going since it's accurate. :lol:
skipper20
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Posts: 836
Joined: Mon Dec 10, 2012 1:19 am
Location: Des Moines, WA

Re: Real MPH = variable

Post by skipper20 »

Argee wrote:I strapped my GPS on the Buddy 170i and recorded actual MPH from 20 to 65 BMPH. Not too bad at lower speeds, but drops off rapidly to over 5 mph too fast after around 60 bmph.

So, my top speed is...62.3 gps mph. No freeways for me.

NOTE: my tire pressure is a little higher than normal.

RAW DATA:
20 17.4 2.6
25 22.7 2.3
30 27.1 2.9
35 31.4 3.6
40 35.7 4.3
45 40.8 4.2
50 45.7 4.3
55 50.6 4.4
60 55.3 4.7
65 59.3 5.7
Indicated,GPS, & diff in MPH
That's about right. My 170i Hooligan's speedos are actually about 10% optimistic at higher speeds.

Bill in Seattle
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