Good testing, idea was right, but keep in mind a GPS is no where near accurate for speeds unless your doing it for many many miles and even then it would only be plus or minus 20mph. Only way to get true speed is a calibrated speedo for that bike. You can take your bike to the state patrol and they can tell you how far your speedo is off. Apply that precentage to your displayed speed and you have an idea of your real speed.
Topped out a 2005 Hayabusa
- Thread starter Lucky34
- Start date
Lucky34
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Thanks guys! I AM pretty happy that I hit 188mph
- that's over 300kph GPS speed 
ZeF, I'll be expecting some reports from you too
. Btw, my speedo tops out at 185 mph (300kph), but when I hit 185mph on the speedo, I'm really only.. hehe.. "only" doing about 168mph. The busa's speedo is quite optimistic
Also, I know that the GPS is also not exact (if something, I think it shows a slower speed than your actual, because there seems to be a lag when you're accelerating). Up to know though, I think th eGPS is the most accurate device available to me.
ZeF, I'll be expecting some reports from you too
Also, I know that the GPS is also not exact (if something, I think it shows a slower speed than your actual, because there seems to be a lag when you're accelerating). Up to know though, I think th eGPS is the most accurate device available to me.
Mr Brown
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Start a thread on that topic, it's the proverbial can of worms. Everyone will have an opinion, prolly all different. My suggestion is try it with it, and try it without, back to back 5 runs w/ it, 5 w/o. See which average is faster.
1127 TO 1299
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already tested
better without it
better without it
SpeedyMick
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Get your speed checked by a speed trap, Try getting some bike speed loving cop to help you out in testing.
i read somewhere that the mirrors do not slow you on a busa because they are part of the aerodynamics or something (dont know how true this is)
i read somewhere that the mirrors do not slow you on a busa because they are part of the aerodynamics or something (dont know how true this is)
Lucky34
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HAHA, that's funny
so I try to stay away from them.
Cobra Steve
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Question...how does the busa know when to start limiting speed? I would assume it goes by whatever the speedometer goes by, so why doesn't it limit it about the time the speedo reads 185?...or is the speedo off because of a mechanical tolerance issue inside the mechinism?
flynjay
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Busa limits speed by knowing it's in 6th gear and what RPM it's running. The speedo has nothing to do with it.
To the best of my knowledge, the limiter works by restricting the fuel and ignition to 1 of the cylinders...effectively shutting it down.
That's why a TRE works...the ECU never sees the 6th gear input.
To the best of my knowledge, the limiter works by restricting the fuel and ignition to 1 of the cylinders...effectively shutting it down.
That's why a TRE works...the ECU never sees the 6th gear input.
Cobra Steve
Registered
Well, I was guessing that the speedo uses the same input, right? So how can it read 185, and the bike can still gain another 14 mph(from his 182 vs 168 gps readings) before it starts shutting off?
It doesn't use the same input.
The speedo is off the sensor on the sprocket/tranny.
The Limiter is off the ECU/RPM!
It shuts the bike down at 10,200RPM IN 6TH GEAR regardless of the speed or speedo reading. That's why even if you change sprockets you can go faster or slower depending what your speed in 6th at 10,200RPM's is!
The speedo is off the sensor on the sprocket/tranny.
The Limiter is off the ECU/RPM!
It shuts the bike down at 10,200RPM IN 6TH GEAR regardless of the speed or speedo reading. That's why even if you change sprockets you can go faster or slower depending what your speed in 6th at 10,200RPM's is!
Cobra Steve
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I didn't know this...thanks for the info!!
I ain't bustin' chops or anything, but what kind of fuel mileage did you get by doing those runs? I'm totally curious how the machine consumes fuel at high speeds.
That's the great thing about motorcycles: you can run them hard and fast, and they still deliver better fuel economy than most passenger cars.
Tell that to the next doofus who pulls up next to you at the pump in his Hummer H2 and asks, "What kind of mileage do you get on THAT?" Make this your standard reply: "40 MPG (I have a '98 Honda VFR800), 140 MPH (yeah, the 'Busa blows THAT to sh*t), cuts through traffic like a hot knife through butter, and I can fart all I want and will never smell it."
<!--EDIT|VFRGuy008
Reason for Edit: None given...|1119719442 -->
That's the great thing about motorcycles: you can run them hard and fast, and they still deliver better fuel economy than most passenger cars.
Tell that to the next doofus who pulls up next to you at the pump in his Hummer H2 and asks, "What kind of mileage do you get on THAT?" Make this your standard reply: "40 MPG (I have a '98 Honda VFR800), 140 MPH (yeah, the 'Busa blows THAT to sh*t), cuts through traffic like a hot knife through butter, and I can fart all I want and will never smell it."
<!--EDIT|VFRGuy008
Reason for Edit: None given...|1119719442 -->
social_engineer
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You have PM ;-)
Very nice run there. I just gps'd mine the other day and got a whopping 177 out of it and the only thing done is the reflectors are removed. Could prolly have gotten more out of it if i wasnt heading into the wind when i ran it. Oh yeah just dont try it in a baggy shirt it WILL beat the snot outta your sides from the sleeves.
c-notefosho
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where/'s a good place to purchase a TRE
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