| Author | Message | ||
     Chopperboy |
I had my Uly on the dyno this past weekend and was somewhat disappointed in the readings - 86.04hp and 74 ft.lbs. of torque. My Uly has a Buell race kit along with an American Sport Bike open airbox kit. I would be curious to hear what others are seeing. My '02 S3T, similarly equipped produced 93hp and 80 ft.lbs. of torque, on the same dyno. Thanks for your input. P.S. - the correction factor was zero in both cases in similar conditions. | ||
| Lorazepam |
The dyno stuff must be a Vtwin thing. I have never cared as long as the bike does what I want. I can use the dyno money for gas. | ||
| Paochow |
Wonder if the tire (D616?) has anything to do with it? On bikes like my DRZ, trying to dyno them with a knobbie or even a Bridgestone trail wing gives lower than actual readings. | ||
| Chopperboy |
I would guess that the D616 would have very little effect on the HP / Torque readings. I agree with Lorazepam that my Uly does run very well but seems to be a little low compared to what others are seeing. | ||
| Aeholton |
I saw similar power numbers on my Uly. Since you are talking uncorrected numbers, here are mine: Special Ops exhaust/stock ECM & airbox - 80.73 hp / 71.88 ft-lbs Race exhaust, ECM & filter (airbox w/hole saw) - 84.27 hp / 75.27 ft-lbs | ||
| Whodom |
Maybe you've got misaligned exhaust gaskets as were mentioned in the original Cycle World test of the Ulysses? These supposedly knocked their bike's output by 7 or 8 HP IIRC. | ||
| Chopperboy |
Aeholton, Numbers are uncorrected as were my S3T numbers. Whodom, I had this thought as well but my bike is an March '06 production and I would thing that this would have been addressed?? Thanks. | ||
| Blake |
Chopperboy, Some factors to consider: 1. What gear? 2. How many miles? 3. What engine oil/viscosity grade? 4. Was the engine good and hot? 5. What air pressure in rear tire? 6. Did the tech sit on the bike during dyno run? If so, how much did he weigh? 7. Was the rear of the bike strapped down? 8. What was the shutdown engine speed? You know what we ought to do sometime? We ought to see how much one can affect a dyno run, meaning the percent difference between the best peak HP and the worst peak HP runs. That would be interesting. I'm thinking that we could get more than a 12 SAE RWHP variance. | ||
| Davo |
Don't forget the timing. If the timing isn;t correctly tuned it will kill the dyno numbers. | ||
| Opto |
XB12S 04 model 87 hp on "low-reading" dyno according to the dyno owner. The Uly doesn't feel any slower either. It just depends on what dyno you get on as to what hp it will spit out. When you leave the other bikes behind on the twisties the dyno figures don't matter much. Interesting that I dynoed the 12 a year before the last run and hp was still well within 1 hp between the best of 3 runs each time. Don't worry about it. I have seen XB dyno charts with 80+ ft/lb torque but I see 74 max on my bike. | ||
| Sanchez |
> Numbers are uncorrected Uncorrected numbers don't mean much unless you dyno tested the two bikes back to back on the same day, and you're only comparing the two of them. Weather conditions make a huge difference. SAE corrected numbers will give you a more fair comparison. | ||
| Chopperboy |
Thanks to all for your input. I agree that dyno numbers are totally subjective and I am totally happy with my Uly and its capabilities. I was a little suprised that my Uly did not produce at least the same readings as my '02 S3T. That is it. Thanks again to all. | ||
| Aeholton |
Uncorrected numbers don't mean much unless you dyno tested the two bikes back to back on the same day, and you're only comparing the two of them. Weather conditions make a huge difference. SAE corrected numbers will give you a more fair comparison. OK here are the same runs I posted above with SAE correction: Special Ops exhaust/stock ECM & airbox - 77.90 hp / 69.35 ft-lbs Race exhaust, ECM & filter (airbox w/hole saw) - 81.81 hp / 73.07 ft-lbs As you can see the #'s are even lower. | ||
| Ftd |
My ULY with std Drummer, KN, and race ECM vs DL tune. Supposedly a stingy dyno too. Frank  | ||
| Opto |
The DL tune sure lifted it nicely! I'm amazed at the 14.8 AFR from the race ecm. The stock ecm on my 04XB Lightning runs around 12.5 to 13 AFR on the dyno with standard Drummer and stock airfilter. Just goes to show how many differences there are between different models/years/individual bikes to have AFR's all over the place. Here I am saying a Drummer will be fine with a stock ecm, but then you were running lean with a race ecm. I never liked my race ecm, and never looked back since I got rid of it. But the point is I just learned a lot from you posting that graph, thanks. | ||
| Grimace308 |
i had my numbers done at buell homecoming when st super daves had the mobile dyno guy show up and i about crapped myself. i was running about 72hp and 60ft/lbs and i dont know if it was corrected or uncorrected. as we ALL were running low, it was determined that the dyno was uber-conservative and about 10-15% low...this did little to help my mood though. after the latest oil change to mobile1, i have noticed a HUGE gain in power and the front wheel comes off the ground with no effort when im not expecting and i looked like quite the asshat at a couple stop lights before i got used to the added ooomph. | ||
| Mb182 |
"after the latest oil change to mobile1, i have noticed a HUGE gain in power" i have a buddy that has dyno'ed Vtwins, changed oil to a full Synthetic and reran the dyno.. 1 to 2 hp is what he saw.. MB | ||
| Aeholton |
"after the latest oil change to mobile1, i have noticed a HUGE gain in power" i have a buddy that has dyno'ed Vtwins, changed oil to a full Synthetic and reran the dyno.. 1 to 2 hp is what he saw.. I thought Grimace was making a joke.  |
