| Author | Message | ||
     Nm5150 |
Went for a ride in Nevada yesterday and they have some long flat straight rodes.Decided to let her rip.165 on the speedo was all I could get.I know if you do the math it is 177 but 165 was all I could get out of Peggy FWIW. | ||
| Barker |
on the dyno mine hit an indicated 172 @ just hair south of 6th gear redline | ||
| D_adams |
Mine's pretty much the same, 174 mph indicated on a dyno when it was stock. | ||
| Ogobracing |
No air resistance on a dyno, which is why it will always show a higher top speed. | ||
| Slaughter |
Douglas, was that 165 when you hit rev limit? Or was that just when you ran out of road and HAD to roll off? Hitting rev limit should be the same for EVERYBODY with unmodified limits on ECM. On the dyno you just get up to "speed" quicker. | ||
| Chevycummins |
So would 200mph be possible with an extra 500rpm with the ebr ecm? I don't think I will be trying it any time soon. | ||
| D_adams |
Not likely. I think it would take 1500-2000 rpm more to get anywhere close unless you go to a chain drive setup and select the gearing you need to get there. | ||
| Bob_thompson |
+1 on what John(Ogobracing)said from someone who has run speed trials at Bonneville. Wind(air)resistance is a great limiting factor for top speed runs. Eats H.P. on the square. Just ask a current rider at the flats, Fireman Jim and others, who post here. Bob | ||
| Kidder |
Nm5150, why do you say "if you do the math it is 177"? Do you have a different sprocket on yours? I've hit 141 (GPS indicated) on my CR and it had some left. | ||
| Froggy |
Nope. You will get only about 8mph more top speed with 500rpm on stock gearing. You would need to hit 12386 RPM according to my calculations with stock gearing to hit 200mph (actual speed, not indicated). | ||
| Drawkward |
Slaughter:
Not sure what you mean by this. Air resistance is a huge limiting factor. Top speed on a dyno is pure bullshit. You will NEVER hit that speed unless you are in a vacuum (and even then the bike won't run). | ||
| Duphuckincati |
I've seen 141 on my CR speedo and she was a-weavin' around pretty good and I lost one of my balls to testicular cancer so that apparently leaves me with not enough balls to go for more speed/weaving. Fun in any event anyway. | ||
| Buellerandy |
If your heavy like me (220+) you will never see 165:P | ||
| 07xb12ss |
i weigh about 220 and ive gone 160 on the R and 155 on the CR. took a while to get there and they didnt have much, if any, steam left at those speeds. | ||
| Juniorkirk |
Drawkward, what if it's in a vacuum but has oxygen tanks attached to the thottle bodies so it can get its air from there........LOL!! | ||
| Ridenusa4l |
im bout 200 and ive hit an indicated 172 then it hit the rev limiter....it was a cool night and a 6% grade down hill  lol Jake | ||
| Fastrichie |
I have hit the mid 170's. Its hard push from 160 on up if its hot out and if your not tucked in. Sometimes its like the last 1000 rpm its like hitting a wall. When it gets cold out in the 40's its a much faster rev to red. Since I put in new stacks it does seem a bit quicker at the top. I have done a few top speed after the stacks. Same deal about 175 but faster to the redline. Its not huge but its there. I think a good top speed on the road is about 140 not holding it. I think the only place you can reach top speed and hold it is on thruway. | ||
| Blake |
Bob, Drag increases with speed squared. HP required to overcome aerodynamic drag increases proportionally to the speed cubed. | ||
| Blake |
So it's even more challenging. Double the top speed requires eight times the HP. | ||
| Sparropie |
Got to 160 indicated this Labour Day up in Canaduh with my saddle-bags a flapin' like an Arceoptrix! Pretty sure I coulda gotten 5 more at least with out the extra drag. The guy on the R-1 behind me (a local cop!) couldn't get close in the twisties or the straights! The 1125R rules the streets that I'm on...  | ||
| Blake |
>>> Top speed on a dyno is pure bullshit. You will NEVER hit that speed unless you are in a vacuum (and even then the bike won't run). I'd like to make a wager against your claim. My vehicle of choice would be any vehicle that is geared such that it can smack into the rev limit in top gear, my '97 Buell Cyclone for instance.  With the right rider and setup a stock Buell 1125R will do 170 mph. | ||
| No_rice |
redline 6th gear front straight of road america. preproduction 1125r's repeatedly. i know one of their speedo's kept saying 172(rode a handful of them) running with tripp nobles for 2 days straight! Not sure what you mean by this. Air resistance is a huge limiting factor. Top speed on a dyno is pure bullshit. You will NEVER hit that speed unless you are in a vacuum (and even then the bike won't run). this confuses me also, so for example, the way that reads, a bike geared to hit say... 150, will hit 150 on the dyno, but could never possiably hit 150 on the street... i have had a blast on the dyno. it hit revlimiter in 5th. and it also hit revlimit in 5th on the street. one thing i have noticed is i cant hit 10,500 in 6th with my inner airbox lid off, but i can when i put it back on, do to the loss of the ram air effect i would assume. every buell i have will peg its top speed high gear rev limit. xb's and 1125's | ||
| T_man |
Hp to speed increase is not a linear equation. Air resistance increases exponentially with speed. Without crunching the numbers - given the 1125R's relatively poor aerodynamics (opposed to other sportbikes), I would estimate the 1125R to need 180rwhp+ to bust the 200mph barrier. Sorry to burst anyones bubble here! (Message edited by T_Man on October 04, 2010) | ||
| Court |
>>>Drag increases with speed squared. HP required to overcome aerodynamic drag increases proportionally to the speed cubed. Bingo. Start to plug numbers into that equation and you'll rapidly gain an appreciation for what is involved. When folks like Richard Nallin, Tim Horton and Jim Higgins go 200MPH at Bonneville . . . I'm convinced that less than 1% of motorcyclists really understand or appreciate what is involved. Try some ciphering . . figure you have a bike that goes 175 and you want to get a Red Hat like FMJH has . . .what do you have to do your horsepower? Scary, eh? By the way . . . . I am snickering here as I think back to the argument on Badweb about 10 years ago . . . it had to do with engineering . . . and some young pup spouted off about something . . . . and sakes Blake "what qualifies you to talk about how strong the frame is?" Of course, at the time, Blake was involved in the structural design of the B2 bomber. The other classic was the time when I shot my mouth off . . . . "What are you a Rocket Scientist?" and got the answer "Yes Sir, I work for NASA". He soon went to work for Buell. | ||
| Curve_carver |
I've had wind on my back going downhill and and only hit 162mph struggling.This was all stock. After a map and a exhaust I've tapped out at 179 flickering 180. This was done in flatland ohio with concrete barriers on both sides<< which also cuts wind. | ||
| Nm5150 |
Out here there are plenty of places you do not run out of straight road for MILES.That was just all she would pull and I didn't make it to red line.I did have a set of Buell bags on her so I might could have done 170 without them.I also have the Ohlins steering damper from Erik Buell Racing to keep things steady at speed.It was just one of those times the stars aligned and I couldn't see anyone ahead of me.I probably ran about 4 miles. | ||
| Slaughter |
drawkward:
That is EXACTLY what I meant. That is EXACTLY why you can get "up to speed" quicker on a dyno than out in the world - where there is air resistance. In either case, you CAN hit rev limit and it will be at the same speed. Rev limit STOPS acceleration and these bikes WILL reach their rev limit on open roads or race track or dyno. Same speed in each case... just different rate at which you get to that speed. | ||
| Smoke |
bouncing off the rev limiter at 166 at Daytona last year at the ROC with belt drive down the straight! this year didn't hit the rev limiter with the chain drive but had the speedo taped over. won't see Daytona again until next October. tim | ||
| 01lightning |
i've hit 155 on my CR with some left...if i could only come out of that last turn with more speed I should be at the limiter in 6th down the front straight of thunderbolt at njmp before I hit turn one. Dont hold your breath waiting for a number from me though, I never look...just happened to glance down when i saw the 155. | ||
| Blake |
I guess wheelspin does come into play, more so at higher speeds. |
