| Author | Message | ||
     Rfischer |
So, for racers and track-day junkies the $64,000 question becomes, will the shorter CR gearing be interchangeable to the R model..? Other than speedo error, I would assume yes. However, it occurs to me there may be other ECU parameters affected by input from wheel/road-speed/rpm. Anybody care to opine? | ||
| Drfudd |
Technically yes, its just a wheel gear change, according to cycleworld its changing from a 70/27 tooth to a 76/27 tooth final drive. The speedo will read wrong, I don't think it'll be a major factor to the ecu. | ||
| Xl1200r |
I don't think the ECU cares how fast you're going in terms of engine management, with the exception of the ram-air effect. but that comes in so slowly, and the error would only be 8%, I don't think it would effect much. | ||
| Fresnobuell |
Is it possible to get something that might correct the speedo error? One of the cool things about the 1125r is that it tells the absolute TRUTH about your speed, unlike virtually every other sportbike. 8% error would be worse that most bikes. | ||
| Xl1200r |
8% error would be better than my XB, lol | ||
| Rfischer |
I would think [think is the key word here..] that a re-flash of an "R" ECU with the "CR" maps would take care of speedo and other errors, if any. But, as this ability [to re-flash] is restricted to the OEM for a variety of reasons, not the least of which is EPA OBD regulations, it is problematic whether that will be available. Until some enterprising hack breaks into the source codes, that is...... | ||
| Xb9 |
Until??? | ||
| Crazydiamond |
This should make the CR quicker through the 1/4 mile correct? | ||
| Dalton_gang |
"This should make the CR quicker through the 1/4 mile correct?" Yes and it should be a little easier to stunt too! | ||
| Jdugger |
I would argue the 1125r is geared too tall all around for the street, anyway. I know gearing has a lot to do with getting emissions and noise under control at the epa test points... but realistically, the 1125r is unusuable at legal speeds in both 5th and 6th... you are lugging the motor. (not that it's a problem for the bike, but you aren't in the middle of the faster revving power...) | ||
| Palerider |
"I would argue the 1125r is geared too tall all around for the street, anyway." I agree with Jdugger. Probably why I stalled my 1125 four times when I first took it out. I thought, this is what a twin is like? I've since gotten used to it but I've always geared my bikes a couple more teeth on the rear sprocket. Sales pitches were always touting top speed ,which is useless on the street. I couldn't believe the Buell was lugging in fifth at around 50-55 mph. That can't help mpg if you're always running hard in the lower gears. Though any bigger sprocket and you won't hardly see the rear wheel. | ||
| Slaughter |
Speedo healer (or some such name like that) can correct speedo errors. Think it's sold by a few of our sponsors. http://www.healtech-electronics.com/ Something like $110 suggested retail. | ||
| Fresnobuell |
but realistically, the 1125r is unusuable at legal speeds in both 5th and 6th... you are lugging the motor Would have to disagree emphatically. realistically, that is a ridiculous statement. Funny how none of this gearing criticism was EVER brought up until the CR came about.. (Message edited by fresnobuell on July 24, 2008) | ||
| Jdugger |
> Would have to disagree emphatically. realistically, that is a ridiculous statement. > Funny how none of this gearing criticism was EVER brought up until the CR came about.. Now hold on a sec... I've mentioned the tall gearing before on here. I just don't wanna go chasing down the post.  I think we can agree to disagree, but I don't think my statement is that ridiculous. The 1125r motor is smoother and accelerates faster if you keep it in that happy place around 6,000 RPM. 90MPH in 6th gear is just below 6k on the 1125r. So, yea, knock that off to 55 and you are looking at a 5th and 6th that have the motor in the 3,500 to 4k range where the surging is noticable. At 6k cruise, the motor is stable as gibraltar! The bike is much more willing to accelerate quickly if you roll on the throttle with the motor at 6k than it is at 4k. | ||
| Rfischer |
This thread started with the qualifiers, "for racers and track day junkies..". It was not to begin a debate about whether the "R" is over-geared for the street. knew I shoulda' kept my mouth shut... | ||
| Jdugger |
We always drag threads off road around here... no biggie! | ||
| Hughlysses |
If they're changing the gearing with the rear sprocket only, does that mean there are two different belts for the 1125? | ||
| No_rice |
unless they changed the size of the idler pulley on the cr it would have to have a different belt. more teeth means the rear sprocket will be bigger. | ||
| Jedipunk |
Buell extended the rear swingarm 5mm on the CR to adjust for the gearing/belt. You might have a hard time swapping it to the R. Maybe you can add a spring loaded belt tensioner? I'm happy with my R the way it is. | ||
| 01xjbuell |
the new gearing would be alot more fun up at NHIS, I hope they make it avail. to everyone -Nick | ||
| Rfischer |
"...extended the swingarm 5 mm..." Hmmmn....seems to me the swingarm would have to be shorter to account for the larger rear pully/shorter belt combo. The longer wheelbase could be to slow the handling down a bit rather than compensate for pulley size, which can be more easily accomplished with a different belt length. Or so M'thinks anyway.. | ||
| Fresnobuell |
So, yea, knock that off to 55 and you are looking at a 5th and 6th that have the motor in the 3,500 to 4k range where the surging is noticable. 75 MPH is about 4,500 RPM in sixth gear. The beauty of having 6 gears is that you can have your choice--and preferred operating RPM! Who realistically rides at 55 MPH in fifth OR sixth gear. I understand you trying to make a point as far as "legal" speeds, but 55 is definitely third gear territory. | ||
| Rfischer |
On 2nd thought.....the longer swingarm is more likely to be for taming increased wheely tendencies from the shorter gearing. (Message edited by rfischer on July 24, 2008) | ||
| Madav8tr |
On a bike like the 1125, "legal" speeds really aren't the point. | ||
| Ccryder |
Yeah and that 0.200" longer swingarm is going to keep the front end down, No worries  | ||
| Jdugger |
> I understand you trying to make a point as far as "legal" speeds, but 55 is definitely third gear territory. Right on. I'd make two comments about the gearing on the 1125: 1. First gear is too tall. For real slow speed stuff (like parking lots), the 1125r is a constant clutch feathering excercise. I do still stall it from time to time, too. <grin> Lower gearing would make the 1125r a little more docile and productive in town. 2. At legal speeds, the upper gears really don't provide much function/value. As you so correctly pointed out, legal speed cruising is done almost entirely in 3rd or 4th gear. (There are some posted 70s in Texas.) It's the combination of #1 and #2 that makes me say "hey, I'd be nice if I could make the gearing a little shorter... Because 1st is a bit to tall, and I'm not even using 5th and 6th on a common basis. I could fix both "problems" with a simple final drive re-gearing." I did this on my VFR800. My complaints #1 and #2 were very common among owners of that bike, too. | ||
| Josh_ |
I don't get it, I ride 65-75mpg in 6th all day long. What's the problem? | ||
| Ridenusa4l |
Yeah josh i hear ya, but some states have stupidly low speed limits... | ||
| Bobup |
JDugger said "Offroad" there is going to be an Offroad version??? an 1125OR ??? how cool would THAT be! hijack and rumor start | ||
| No_rice |
1125CR = Wheelbase (5) 54.5 in. 1385 mm 1125R = Wheelbase (5) 54.6 in. 1387 mm now what am i looking at wrong here? these are the wheel base specs right off of buells website. to me it seems as though the CR is a hair shorter, not longer. maybe i missed something somewhere else |
