Buell Top Speed :-)

[TheStuffJMI]

I just bought an 07 XB12R and I also ordered the D&D Exhaust. I want to make sure I don't need an ECM right now when the exhaust gets here and I try and put it on. I want to make sure it's going to run properly, I'm not worried about perfmormance gains what so ever. Just sound and regular stock performance. I will eventually get an ECM in a couple months. Please let me know if the bike will run with the D&D and no new ECM.
Thanks,
Justin

 

[07xb12rblack]

yo justin let me how she sounds. I'm ordering one next week but I'm gonna just do the race ecm and k and n filter. I don't think you have to change them but I want it to run cleaner... No-one seems to have heard the d and d next to a drummer to compare the sounds exept on the exhaust shootout but I can't tell the difference on the comp.

 

[buellxb]

I'm in Carmel Indiana, right off of Michigan Rd (421). My Neighborhood is actually at 131st and Shelbourne Rd. My wife is from Fort Wayne. She lived in this little town called Poe. I think the town consists of one stop sign, one retired church, a biker bar, and an old mechanics shop.

 

[TheStuffJMI]

Dude, once I put the D&D exhaust on today I couldn't believe my ears. I honestly didn't expect it to be even close to as loud as it is. I absolutely love it and wouldn't give it up for anything else. D&D is the only way to go if you want a deep throat sound.
Justin

 

[slydwazer]

WOW!! Bench racing at its finest. Reality is as simple as math and purely dichotomous - right or wrong. Fact: maximum engine rpm (the speed where it hits the rev limiter) divided by primary ratio divided by transmission ratios (secondary ratios), divided by the final ratio (countershaft and rear wheel sprocket) equals rear wheel speed in rpm. Rear wheel circumference of a 180/55/17 tire when new is 77.896 inches, meaning that it travels 77.896" per rotation. Using the required data (primary, secondary, final, and overall ratios) published by Buell (factory service manual), for an '04 XB12S (which is the same for '05 XB12S & XB12R) the following is the maximum speed for all gears for this application.

1st 55.463 mph
2nd 80.647 mph
3rd 104.333 mph
4th 126.438 mph
5th 149.196 mph

The assumptions are that it hits the rev limiter in all gears at 6800 rpm, uses stock gearing, and the rear tire is brand new with no wear. If the tire's tread has worn 3/16" off, it will top out at 148.478 mph. Tire swell is virtually neglible and isn't considered.

Engine mods do nothing to increase top speed IF you are currently hitting the rev limiter in high gear. It will only get you there faster. If you went faster than this, you either - increased the rev limiter speed set point, changed the final drive to a higher ratio (numerically lower), or put a taller tire on the drive axle.

 

[maybebuell]

on the highway in 5th you wont pull redline... so that mph will be down...the higher rev will allow faster or quicker 1/4 mile time ..thats probably only in first three gears

 

[xb12Rider]

First off I live in new york state I travel to and from cohoes to brooklyn new york. The ny thru way I87 I took my bike up to at least 145mph. I had a go down last july ,a cager turned in front of me causing me to believe I was in peril.( I made the mistake of killing all my time braking points and distance) after the bike was (fixed!) meaning k&n air cleaner,race ecm which is not installed by the way.the bike needless to say goes 150mph exactly at the same time the rev limiter kicks in, for real. Just my two cents. oh going 145mph feels alot like free falling out of a plane it also means that the similarity doesnt end there you cant control any other variable except the speed quotient. meaning back off the throttle before some thing runs in front of your bike LIKE A DEER!

 

[Unekride]

138.4 TOP-SPEED. From the dyno at the harley shop I work at. It looks like 140 on the speedo but your full of crap if you think your bike goes 160-170. If you want top speed get a Busa. Otherwise enjoy your bike for what it is, a great handling STREET bike.

 

[TheStuffJMI]

I definetly agree with Unekride, I have seen constant dyno's of the Buell Firebolts and I have an 07 XB12R my self... none have gotten up to 150mph.

 

[maybebuell]

better chance on a dyno hitting 150.....once peak power is made they shut the bike down... it could be held open untill 150 but whats the point of that..there after hp reading...unless your saying the rev limmiter kicks in at 138

 

[xb12Rider]

Dyno... What,....Wait now I am not gonna record this moment because it's way too dangerous. but I will say this I was probably going down hill both time I got her up to speed. cause the bike did suprise me when it hit that speed. Another time I was sprinting past (dead spots) in traffic on the thru-way I passed a car and went on to the next rest stop. This guy walks up and says hey guy how fast were you going back there, I go" look officer"... getting ready to tell him that I got a bad case of the runs,the guy says he's not a cop I say "like 100-120" he goes more like 140-150 cause you passed me like I was standing still. I ask how fast were you going he said 100-110 we both kind smiled at each other like the uneasy smile when you almost get caught screwin your neighbors hot wife, dive out the back window only to land next to the twenty-something year old kid who's banging out the twenty-something year old daughter. We were both wrong and we knew it, so I kept it super legal the rest of the way home...

 

[mezap]

dude...are you sure you want to even post that? Forget the *ahem* less than savory analogy's about wives and daughters, but the "this guy told me so" rebuttal is gonna draw more fire than a preacher on oprah! (sorry, really really don't like her...)
slydwazer- you sound just exactly like my CTC instructor! He is a totally brilliant guy who also happens to ride an xb12s. He also used to race flattrack, which your name sounds like you do as well...

 

[Unekride]

FOR ANYONE WHO THINKS THEIR BIKE GOES 140+!! You are so full of it. Your last bike (probably a ex250) did stand-up wheelies at 110 mph because you have it on tape. I wish my bike was faster but if you want top speed don't ride a air-cooled pushrod motor. The only bragging rights a Buell has it it is a fun street bike that always puts a smile on your face when you ride it. I don't know if you will have time to read this because you are probably busy pulling away from Rossi in the straights but you need to pull your head out!!!

 

[Unekride]

XB12Rider: I was giving you the dyno numbers because they are more accurate then the guy at the rest stop. Plus going that fast on the street is SO dangerous. (I hope you can detect the sarcasm.)

 

[wijjiamxb9r]

one time my uncle hit 175 on his buell. he has a blast. he says he uses rubbing alcohaul for gas and olive oil for oil. i highly recomend doing this if u want to go over 130. and like brad said, proper tire inflation.

 

[mrdozer2you]

Wow, mine runs on Mountain Dew and only tops out around 165

 

[mezap]

wow mrdozer...have you tried sobe or red bull yet? surely good for another 5 mph... provided of course you ARE using the olive oil for oil. Wijjiamxb9r: Will baby oil work as a sub for the olive oil? I was planning to make a salad tonite...may not have enough...[smirk]

 

[Mace]

I have had my 07 xb12r bounce the check engine light on me because I had hit the rev limiter at 135 or so. I got scared... the bike was till pulling at that speed too... but the rev limiter was stopping me.

 

[slydwazer]

mezap ... thanks for the compliment.

 

[TheStuffJMI]

Yea I don't know what he was talking about having his blast up to 175. I was amazed he hit that top speed in his blast. I have only gotten my XB12R up to 220 in fifth gear, I run e85 gasoline in my 12R lmao who's he kidding