| Author | Message | ||
     Tonedeath |
just picked up my 1125r from the dealer after being down for a month. They replaced my instrument cluster and now i have a gear indicator. My bike is running great in this 55 deg weather. I think all the bugs are worked out for now. | ||
| Funktron |
zoooooooooooooooooom zooooooooooooooom seeeee?!?!?!?! just give it time, don't let the frustration set in. | ||
| Fresnobuell |
There is NOTHING like riding this bike. I dropped my bike off this morning and on the ride to work a co-worker said I should stop riding as it is too dangerous. I couldn't even fathom the thought of getting rid of my 1125r--maybe that's a bit overboard, but that's how I feel! | ||
| Chameleon |
There is NOTHING like riding this bike. Sex is close...  Hey, anybody else notice improved performance in cold weather? I used to hit 96 mph at exactly 6k RPM in 6th gear, now it registers 100 mph. Power wheelies are even easier, too... a co-worker said I should stop riding as it is too dangerous Must have been a woman... Or a gelding. (Message edited by chameleon on January 21, 2009) | ||
| Dalton_gang |
"Hey, anybody else notice improved performance in cold weather?" "Power wheelies are even easier, too..." Absolutely! I think that mine looses it`s ability to do 3rd gear power wheelies at above 65 degrees and it gets really tough to do 2nd gear power wheelies above 80 degrees. Does anyone know how much of a difference there is in power based on AAT. Lets say 50 deg F vs 90 deg F?} | ||
| Carbonbigfoot |
Just a thought, here, but IF there is communication between the ambient temp sensor and the computer, then when it's cooler it should richen the mixture. Maybe it's just getting a bit more fuel as well as denser air? Everything runs better in cooler temps, but this bike does seem to get an even more healthy kick than most anything I have ever piloted. Rob | ||
| Ron_luning |
Chameleon: Since your engine speed (rpm) alone is what drives the rear wheel via the transimission, there can be no change in speed based on power output of the engine given the same rpm. If the bike made 50hp it would propel the bike to the same speed at 6000 rpm as if it made 146hp. One possible cause of increased speed at a given rpm is if you got new tires. As your tires wear down, their circumference will decrease (rubber has been worn off) and that will produce slower speed at every engine rpm. If you replace the tires then all that missing rubber is restored, thereby increasing tire circumference and speed vs. engine rpm. | ||
| Dalton_gang |
"I used to hit 96 mph at exactly 6k RPM in 6th gear, now it registers 100 mph" I think that mine has always been 99 mph at 6k in 6th ever since the 1st ride home. I would think that only a tire change would affect the speedo unless you changed some parameters in the ECM or something. edit: Ron beat me to the point that I was trying to make (Message edited by dalton_gang on January 21, 2009) | ||
| Tonedeath |
well i been on my bike all morning and its about 45deg here in south louisiana. My third gear wheelies are alot easier i know that much.....but i had to put my bike back in the shed for a while for legal reasons. | ||
| Ccryder |
Raymond was someone looking for you? Anyway, one reason it might wheelie easier at low temps is the shock is actually stiffer due to the oil being thicker. When the power is not used to compress the suspension, it will raise the front wheel easier. Time4Food | ||
| Tonedeath |
maybee someone was looking for me ccryder. but i go offshore tommorow for two weeks so i had to get my riding done this morning. yea i never thought of the oil being thiker. | ||
| Zac4mac |
Ray - be safe and stay warm. I did a couple of stints in the Gulf, roustabouting for Zapata in the 70s. Belle Chase to Brownsville. I stayed off the floor as much as possible, I like having 10 fingers. | ||
| Chameleon |
I thought about the tire thing, but I have the same tire. The only change made was fresh oil & a filter. With over 20,250 miles on my bike, I think I know it pretty well by now... Mine has done 96 at 6k since day 1. I'd get 100 at just a hair over 6k. Now I get 100 at exactly 6k. Maybe I'll capture this on my VHoldR for y'all. | ||
| Tonedeath |
yea zac4mac i stay safe and warm in the wheelhouse i rarely go outside | ||
| Dalton_gang |
"Maybe I'll capture this on my VHoldR for y'all." You don`t need to prove anything. I was just offering info for comparison. Ccr is right too. I forgot that even small adjustments to the suspension and fluid viscosity will affect the ability to wheelie. But I can feel a loss in power when it gets warm outside. | ||
| Chameleon |
You don`t need to prove anything. I was just offering info for comparison. No, I don't, but I am very interested in why this change would occur. Could it be related to the colder temperatures producing more power and allowing the engine to turn the transmission with slightly more efficiency? Or is it simply NOT physically possible at all? i.e. If one were to turbo- or super-charge the motor, would it not be capable of higher speed at the same RPM? | ||
| Eaton_corners |
If the speed sensor is in the transmission, tire size will not change the speedo reading. If the vehicle has a manual transmission, the only variable would be clutch slip or gear clearance due to wear. Most likely it is just a misperception in reading the tach. | ||
| Ccryder |
"If the speed sensor is in the transmission, tire size will not change the speedo reading." Steve: I think you have a little mis-information here. Unless you were checking "air speed" or using a GPS, tire size/ wear (even though it is a small factor) will change your speedo reading. When I have brand new tires, my speedo and GPS read the same. When my tire gets near the end of it's life (the tire is spinning more RPMs relative to how far it travels/ rpm) my speedo is off from my GPS by 2-3mph. Later Neil S. | ||
| Chameleon |
OK, I forgot a few possible factors in this equation... I did also change the spark plugs at the last oil change. Two days prior, I snapped my 2nd final drive belt. It was replaced that day. I've used Shell fuel in the last two or three tanks. Previously I frequently used Costco fuel. This, along with the colder temperatures, are probably the most significant factors. I talked to a Buell specialist tech and he concurs. You can see my maintenance history here: http://spreadsheets.google.com/pub?key=pb2pblrkFXr 1vSGtGZ8HeJg The rear tire has approximately 3,312 miles on it with very little apparent tread-wear. | ||
| Eaton_corners |
Neil, I would expect the actual "road speed" (i.e. your GPS reading) to be different than the speedometer on a worn tire. But the tachometer and speedometer should maintain their calibration if the speed sensor is using the transmission output shaft to determine road speed. This would be why your reading differs from the speedometer with a worn tire. If I'm missing something in my logic, hopefully someone can help me understand how this works. | ||
| Chameleon |
Most likely it is just a misperception in reading the tach. I don't think so... My wife often [accurately] accuses me of being obsessed with minute details. I know what I am experiencing, just wanted to know why. Someone please answer this: If one were to supercharge a motor is it then capable of higher speed at a given RPM (example: the middle of the RPM range)? | ||
| Ccryder |
Steve: I can't argue with your logic that the rpm to speed ratio should stay the same. After all it is just a ratio of different "gear" sets through the engine and drivetrain. Paul: This same rational holds true for your question. If you add more HP/ Tq to an engine but, do not change any internal or external gearing compared to a "stock" engine, then the rpm to mph will not change. What will change is how fast you get to a given speed. Hopefully that makes sense. | ||
| Eaton_corners |
We must have been saying the same thing with different words.  | ||
| Pizzaboy |
i cant believe you guys are STILL trying to decide if a change in power output from your engine will result in a different RPM at a given speed and gear selection. at least most here understand that the RPM cannot change given a gear and speed. power output has no effect on RPM at a given speed and gear. period. my bike has been at 99mph while at 6k and 6th gear since day one. its the same today. it will be the same tomorrow. THE ONLY WAY IT WOULD CHANGE would be if i changed the gearing. yes your GPS will always be right. no your speedo will not always be right. your speedo will lie to you if your tire size changes. the bike still **THINKS** its going the same speed, but the bike also knows what size tire its calculating for. if the tire size changes because of wear, the bike will not compensate for it. its been said like 5 times already and ill say it once more for fun... it doesnt matter how much HP your bike is making.. its still going to go the same speed at the same RPM. ** ok, fine. if your bike is making 250HP, it has enough power to slip the clutch at any RPM it wants.. then you can argue that your bike was going at a different RPM with the same speed. with that kind of power, your can put your RPM needle anywhere you like regardless of whether the clutch is engaged in a gear or not.. but all you're doing is slipping the clutch. with that said, of course your bike makes more power at colder temperatures. colder air is more dense and holds more... oxygen. you bike needs air to work. the more air you cram into the cylinder the more power it will make. thus the invention of forced air induction AKA turbo's and super's. cram A LOT of air into your intake, and your making craploads of power.... however if you're trying to cram in an extra 15psi of 500 degree air.. doesnt that kind of defeat the purpose?? 500 degree air doesnt hold nearly as much oxygen as 40 degree air 90 degree air doesnt hold as much oxygen as 40 degree air... enough of a noticeable difference on a motorcycle that you can feel it on your butt dyno. ill confirm the turbo/super question for cameleon also. no. horsepower and torque only determine how FAST you get to a certain speed or RPM. it doesnt change anything else. (Message edited by pizzaboy on January 22, 2009) | ||
| Chameleon |
That all makes sense and confirms my thinking. Thread jack completed.  | ||
| Ron_luning |
For those of you having a hard time visualizing the rpm vs. speed thing, this will make it even more difficult: As you go around a corner, you lean the bike and since the outside circumference is less than the centerline circumference on the tire one of two things can happen. If your speedo pickup was off the front wheel (old bikes) as you went around a corner holding the same rpm, your speedo would increase because the tire would be spinning more for the same distance covered. Meanwhile, because of the same rpm, your speed over ground would decrease. I haven't checked, but I think that the circumference would change more rapidly on the front tire than the rear, therefore the speedo would go up a little even though you're slowing down over ground. If your speedo took its reading off the countershaft, then as you went around a corner your speedo would remain the same while holding the same rpm, but your speed over ground would decrease. It seems like that makse the transmission reading speedo a little bit better. Plus they don't say zero when the front wheel is off the ground. (Message edited by Ron_Luning on January 22, 2009) | ||
| Eaton_corners |
Pizzaboy, I'm guessing you're not a teacher. | ||
| Ccryder |
Steve: It didn't take you too long to see through him ;+} We just just throw another tolerate log onto the fires he tries to start, it usually brings the flames down to a dull glow. Time2Eat |
