| Author | Message | ||
     Skylerxb12r |
I made a few dyno runs today at work just to get a feel for running the dyno. I was pretty pleased with the results, 124.79 hp and 73.33 lb/ft of torque. All the runs were within 1.5 hp and lb/ft of each other. 124 hp at the wheel works out to about a 15% parasitic loss through the drivetrain which seems reasonable to me... The air fuel curve starts at 15:1 at 5k rpm and slowly dips down to around 13.5:1 at 9k rpm then starts rising to 13.8:1 at the rev limiter. I would post the printout but im a complete idiot and have no clue how to resize an image so i can post it. Im excited to fatten her up with the new tuning software to see what i'll get out of her. Hopefully next thursday (my next day off) will be spent on the dyno. Just for reference my only mods are a home hacked muffler with a 3" turnout tip, de-noided, removed inner air box cover and a K&N. | ||
| Hooliagn |
Excuse my ignorance being new to Buell an all but what happen I thought 135 +/- at the wheel for the 1125 model was the norm ??? | ||
| Zac4mac |
Somewhere around 130. Different dynos and operators will get different results. Not as much an objective view as it is subjective. Mine dyno'd 127 at 700 miles on a DynoJet 200 and 128 at 7000 on a DJ 250. Planning on getting with Buelliedan for some dyno time, soon. eg. my bike may run 125 on one set-up and 131 on another. Altitude and "corrections" play havoc with the results too, I'm at 5000'ASL. HUGE difference in power at Sea Level. Big benefit is direct comparison. Same dyno. same operator, baseline it. mod it. dyno it. repeat. Zack | ||
| Hooliagn |
Got it ! The guys at Liberty NJ told me that they haven't dyno'd an 1125 that got less then 136whp. | ||
| Cobradave93 |
Mine read 139.9hp on Dynojet at Battlefield HD in Gettysburg, PA this past April on the original ECM mapping. | ||
| Kttemplar |
Hooligan, I had mine dynoed at liberty 20SEP2008 DYNOd @ Liberty HD/Buell 128.92 HP/73.57 Torque 6047 miles on bike 81.42F @ 27% Humidity mike | ||
| Skylerxb12r |
Im not upset with my numbers because i know our dyno isn't the most generous... even if it is christmas time. I RARELY see any HD combo over 100hp and just for comparison we ran a Destroyer a couple of weeks ago that put out 140 at the wheel. My main concern is tuning for improvement, not the peak numbers, since numbers can vary so wildly between dynos. | ||
| Hooliagn |
Good point | ||
| Jerseyguy |
'08 1125R @Liberty this summer. 2nd reflash.  | ||
| Carbonbigfoot |
Poor Skyler... Slow at work, so he has to play with the Dyno to keep himself occupied... <grin,> BTW, if you need another bike to "get a better feel" for the dyno, you have my number! Rob | ||
| Hooliagn |
What is the crank HP on a VRod Destroyer ?? | ||
| Carbonbigfoot |
165+ (!)  Rob | ||
| Hooliagn |
Then 140HP seems about right. | ||
| Thunderbox |
Hey Jerseyguy, that dyno is not correct. If the people who did the dyno knew what they were doing they would know that something was severely wrong with that run. Here's why. Below 5252 rpm any engine's torque number will always be higher than its horsepower number, and above 5252 rpm any engine's horsepower number will always be higher than its torque number. At 5252 rpm the horsepower and torque numbers will be exactly the same, this is a mathematical formula and is not up for discussion. Seeing the lines cross at 9400rpm tells me something is not right and those numbers mean vertually nothing. If you don't believe this just google HP and Torque | ||
| Teach |
Oh boy, here we go...  | ||
| Jerseyguy |
I'm just the messenger. Possibly I printed it out incorrectly from the file? | ||
| Thunderbox |
Not a problem. I just see this all the time and maybe people should be aware of how it works. If we are getting ripped off or false info I think we should know the scoop. After all they don't do dynos for free. If we give them money to do it I think we should get the job done properly. | ||
| Pariah |
But they are equal on the graph... read it off: HP (@5252 RPM) = 68hp Torque (@5252 RPM) = 68 ft-lb The graphs don't intersect at 5252 RPM because they've shifted the torque scale upwards... it's just a plotting issue. | ||
| Carbonbigfoot |
+1 Horsepower on the left. Torque on the right. Rob | ||
| Thunderbox |
Ah ha I see said the blind man. Thank you. The trees were unseeable because that damn forest was in the way. Poor way to do a dyno chart but I will look at the big picture next time. | ||
| Jerseyguy |
I can take the blame for the scaling.  I plotted it using Winpep7 from the file generated at Liberty. |
