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+--- Thread: New toy (/showthread.php?tid=5491)
New toy - peter altas - 08-07-2003
Just bought a Magellan Miridian GPS.
This thing is great. Tracks and displays speed (in real time) more accurately than any speedo, with a held top speed so you really know what you got to, along with plotting your course on a map with real time stamps.
Will be good when I get onto the track. They say they won't allow any recording/timing devices. This thing can be left in it's pouch and will record for as long as it's left on (up to 14hrs). Have been playing around with it, but is should be able to record/show corner speeds, straight top speed, altitude, and to a lesser degree, an approximate lap time.
I also know someone who used his Megellan GPS to win a speeding fine in court, as his gps showed he wasn't speeding.
If anyone in melb wants to check their speedo's accuracy, (even when they work, the speedo-checks never pick me up on my bike) or get a mapped and verified top speed run (keep in mind that these devices can be confiscated and used as evidence against you too) drop me a line and we can tee something up. Will cost you a latte though.
Looking at hiding it inside the hump space so that I can get away with it on track days.
Peter Altas
BUSA-1
Re: lap times - MaxPower007 - 08-07-2003
by the sounds of things you'd be better off with a sundial
Re: New toy - Slong - 08-07-2003
Hey!
That's just what I need! [a test]
When I'm going again, I'm not confidednt that I put all the gauges/needles in the same place. Been trying to figure out how I'd be able to check and that'd work sweet!
How much did it cost, and where from?
thanks,
-jon-
Re: New toy - Scott W - 08-07-2003
Quote:Will be good when I get onto the track. They say they won't allow any recording/timing devices. This thing can be left in it's pouch and will record for as long as it's left on (up to 14hrs). Have been playing around with it, but is should be able to record/show corner speeds, straight top speed, altitude, and to a lesser degree, an approximate lap time.
It has a lap timer? That's the only real use it will be for you on the track I think.
Nice purchase, hope it works for you Peter.
Re: New toy - peter altas - 08-07-2003
It's not a lap timer. Lap timer's need a reference transponder located somewhere on the track. The GPS plots your course with reference information (speed/time and distance/time) against mapping coordinates it recieves by triangulating at least 3 satellites. If the coordinates match up, you have a lap timer. But knowing your top speed around the course will be cool too.
Was primarily bought for navigational purposes, but this is a cool spinoff I wasn't expecting.
Slong, they're not cheap. I got the Platinium model from the boat show at 10% off, which was still $900. If you'd like to borrow it for a day, we can go for a ride somewhere and you can check your speedo with it. If all you want it for is a speedo readout, a $200 unit should be able to do that. Dick smiths and any 4x4 shop will sell them.
Peter Altas
BUSA-1
Re: New toy - GDYUP - 08-07-2003
I think if most Busa riders found out how far the speedo is out they might be dissapointed with their new toy.
Be interesting to see how it works out Pete.
Cheers, Phil. Riding the old fashoined way.
Re: New toy - busababy - 09-07-2003
not sure how accurate or reliable the electronic speed checker on the hume is, but last sunday it indicated 84 whilst my speedo showed 102... that is a pretty big discrepancy….. i run a 43 tooth rear sprocket… maybe it’s time for a yellow box?
43 tooth smile - Fast Freddy Gassit - 09-07-2003
Quote
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not sure how accurate or reliable the electronic speed checker on the hume is, but last sunday it indicated 84 whilst my speedo showed 102... that is a pretty big discrepancy….. i run a 43 tooth rear sprocket… maybe it’s time for a yellow box?
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End Quote
Last year when the busa was still alive I had a police officer zap me as I went past at different speeds (all within the speed limit naturally) and my findings correlate with the above. At 100kph indicated the actual (police) speed was 85kph. Obviously that works out to a 15% error but impresses some people when they say they reached 300kph+ on a public road. Of course another way to look at it is when your odometer shows 10,000km you have only done 8,500km.
Speedo's, the fools paradise (Not the swimming trunks) Ha! - GDYUP - 09-07-2003
Here, here FFG.
At least you pointed out a good side with the odometer. (I think? )
Cheers, Phil. Riding not mono ing.
odo - demeester - 10-07-2003
No, I think the odo is a negative. When you are selling, it shows more k's clocked up than in reality...
speedo error - hawkwind racing - 10-07-2003
yes you are right ,you will show more Km than you have really done
I use this method to give me a reasonably accurate estimate of my actual speed , I work out what the bike will pull in top gear at 1k RPM for a stock busa with a sprocket combo of 17/40 and a stock wheel /tyre these are the calculated kph for each 1k rpm for
1st =12 kph at redline 125 kph
2nd = 16 kph 169
3rd = 20 kph 215
4th = 24 kph 255
5th = 27 kph 288
6th = 30 kph 314
so check your speed at these RPM
60 kph = 2000 rpm
80 kph = 2700 rpm
100 kph = 3400 rpm
110 kph = 3700 rpm
from the above figures my own bike runs between 12% to 15+ % optimistic with the higher the speed the greater the error
Gary
Re: speedo error - busababy - 10-07-2003
should be a law against allowing motor vehicles to be registered with such inaccurate speedo devices