| Author | Message | ||
     Preybird1 |
I was just wondering what top speed you guys are hitting with the race ecm and race intake and race exhaust. When we tested mine it would rev-limit @ 155 mph. Now how accurate is the speed o on these bikes and does anyone have a pic of the speedo at this speed. | ||
| Ochoa0042 |
my bike can go 200mph if geared right.. but I dont think 155 is acurate, I thunk 140mph is the max speed.. were you on a dyno when you hit 155? | ||
| Preybird1 |
No I WAS RACING A DODGE SRT-10 viper truck and he confirmed his speed o was at 153 mph so i was just wondering what yall thought | ||
| Zoedogg1 |
I think you both might need a speedo check. Its just not possible with stock gearing. Sorry, but VERY true. If you add a 6th gear you might be good to go. | ||
| M1combat |
Yeah... bout 138-140 is all you'll get unless you change the gearing and add power. | ||
| Petebueller |
The rev limit on an '07 XB12R with stock gearing is 140mph. You should find that the bike does 60mph at 3000 rpm. Straight multiplication gives 120mph at 6000 rpm and 140mph at 6800 rpm. Some of the earlier speedos particularly can read optimistically at high speed. I played with primary pulleys to gear up my bike and a friend's bike. The stock primary pulley has 38 teeth on an XB12. My friend's bike with a 41 tooth primary was doing 150mph at the rev limit (read from a GPS, but the speedo agreed). The bike was running a Micron, and open airbox and a map. I have a 42 tooth on mine. I've never maxed it out but theoretically it would do 155mph in top at the rev limiter. It pulled to 125mph in 4th on a dyno. It may need engine work or a downhill run to get all the way to 155mph. | ||
| Brumbear |
I being a portly lad can only get 137 flat out down hill 140 142 maybe get someone with a gps or get one yourself I believe they are much more accurate but I don't care for the straight out run I like the twisties to me that taxes your skills quite a bit more than tuch and twist | ||
| Diablobrian |
speedometers are terrible means for measuring true top end potential. Most are designed to be fairly accurate around the 55-70mph range. within that range it is legal for the speedo to have as much as 10% error plus or minus. Outside of the "normal operating range" the error can grow to more than 25%. If you want to know your true top speed do a dyno run, or do a timed run over distance measured by a recognized organization like SCTA, ECTA, etc. Because of other factors like aerodynamic drag you will find hitting 200mph on a partially faired or unfaired Buell a bigger challenge than you might expect. We have a bunch of dedicated LSR racers here on badweb that would be more than happy to talk to anyone interested in what it really takes to get a Buell into the record books at Bonneville. 150 is do-able with proper gearing, on a 100hp Buell, but from the factory 145mph is more realistic. You can gear it to run 300mph but if you don't have the HP to pull those gears to redline..... | ||
| 2008xb12scg |
Diablobrian-this just looked at your profile and this is going to be one of my favorite quotes so don't be mad if I use it. Oops, was that a thread jack? I am not afraid of dying anymore, I am afraid of not living. | ||
| Bads1 |
You first must be able to say it with truth and honesty to yourself. I'm willing to bet that I know Brian just touch enough that he can. | ||
| 2008xb12scg |
I don't have the pleasure of knowing him, but it was one of those silly little things that makes you think about stuff. So thanks for that. | ||
| Duff24 |
You should see how far off the speedo's are on metric bikes, from experience it's something like 15% off once you reach top speed. | ||
| Diablobrian |
If it brought a smile and made you think....mission accomplished. Thanks Dana, and I do mean those words with a sincerity that is hard to find without getting real close and personal with the specter of your own death. Anyway back on topic: speedometers are only designed to meet a minimum spec on accuracy over a very narrow range of speeds. If you want the truth you need to look elsewhere to find it. | ||
| New12r |
As stated above, with the current gears on a Buell and the redline at 6800rpm you will NOT break 140mph unless you raise the red line or change gears. I asked one of the engineers at Buell on a track day and that is what he told me. | ||
| 46champ |
The total number of bikes all manufactures that have received a timing slip over 200 MPH naked, and the fly screen on our bikes moves them to partial streamlined, is less than 20, This is from the organizations that measure these things SCTA,BUB, ECTA etc. Of those the total that have done 200 on gasoline with no power adders fuel, blower, nitros is 4. | ||
| Ochoa0042 |
I would say metric bikes are very accurate x<160mph, they are RR afterall |
