| Author | Message | |||
     98s1lightning |
I put my bike on the Dyno today, it thru down an easy 120HP all stock. I start looking thru here an see a huge difference in numbers, what gives? My bike has 9000 miles, it was running 100 degrees, And the out side temp was around 80. Any ideas? | |||
| Froggy |
Your numbers sound about right. | |||
| Xnoahx |
They give different numbers. Dont worry about the numbers, just go ride | |||
| Reepicheep |
120 RWHP, or at the crank? Real RWHP, that sounds pretty good to me for a stock bike. My XB9 on an honest dyno came out at about 76 honest RWHP, which served me very well for 30k miles now. If it bugs you, have the dyno operator override ambient temperature to say it was a 120 degree day, and print it out again. That will make your numbers higher, if that's your goal. | |||
| D_adams |
Or if you really want to have something to be upset about, tell them to run it with a 25% load on the brake. See what you get then, I'll bet money you won't be happy with those numbers and the 120 hp at the wheel will start looking pretty good. | |||
| Mountainstorm |
I've seen runs here from 112 to 131 RWHP. Dynos never report the same figures even for the same bike on the same day. Heat dump in the dyno chamber yada yada. Fuhgeddaboudit | |||
| Dannybuell |
EBR ECM, a new pipe, and a K&N air filter. | |||
| Anonymous |
Dynos are all over the place in fact. The only way to compare is on the same dyno. I have seen the same bike make from 118 HP to 132 HP on different units of the same brand of dyno! There are differences in the units and there are always differences in the installation and the operator settings. Also there are differences between dyno brands: Superflows measure on an average significantly less than Dyno Jets, around 15% less. Both companies can defend their way of measuring, and will have proponents who will get enraged over which is right. But in the long run you simply have to compare bikes or settings on the same dyno to give you an idea where you are. | |||
| Guy_glover |
Never saw any posts regarding dyno runs verses different ecm downloads. My first 1125 #388 dynoed at 136.98 When the new downloads came out the dealer installed it and upon riding found the bike to be very smooth but way down on power. New dyno run showed 114 HP. I complained and the dealer told me they all make around 120 and my friends dyno must be wrong. I insisted power was waayyy down so they pulled the ecm off a floor model,installed and re-dynoed.Bike is now back to 134 and also back to running like crap around town.My other bike[track]#388 dynoed at 134 with the original download and also runs bad at low RPM.[under 4000] The two 1125's I bought last month have the newer download. Both bikes are much more rideable around town but dynoed at 116 and 120. | |||
| Glitch |
A dyno is for tuning purposes, use one for your ego at you own risk. | |||
| Kidder |
If you're going to compare dyno runs for tuning, then you need to do your tuning that day on that dyno. IE, swapping from stock ECM to EBR. Baseline the run, drop in the ECM and see the results. Dyno to dyno comparison are worthless. | |||
| Stirz007 |
Got 118 on my bone stock baseline @ 4500 ft. elevation. | |||
| Chevycummins |
Stock run a couple years ago.  | |||
| Kaotikevo |
Glitch hit it on the head, I couldn't have said it better myself. | |||
| Stirz007 |
Stock Run from two days ago.....
| |||
| Chevycummins |
Kinda hard get a baseline run, then swap the EBR race exhaust on the bike with the race ecm and get another dyno run all in the same day. Not impossible, I know someone who did but I could not. Stirz007, Interesting to see how similar our runs were with the exception of the flat spot my bike had from 8500 to 9500 rpm. The race ecm did correct that problem area though. | |||
| Redscuell |
98s, don't listen to these chaps trying to tell you to be satisfied with Erik's handiwork. There's nothing wrong with you being unhappy with the bike putting out ~120 hp when you paid as much as the chaps running around town on their CBRs. This is a fan forum; they don't like anyone to say anything other than "Hail Erik". Face it, he didn't get it right. | |||
| 98s1lightning |
Lets get one thing straight, I too am a huge BUELL fan but not a fanatic. Your weak ass 181 HP on a Busa thats over two hundred CC's larger does not impress me. However, my buddies ZX10 with 211 HP does, now take your bike to the track, either straight or curved and watch how you will get pounded. I can and have bought any bike I want and I chose the 1125R because I, unlike you, ride my bike to other places than the local bike night to show off my new billet mirror block off's and my extended swing arm with an 8 foot chain, NOT THE ONE AROUND YOUR NECK. I'll give you a full minute head start on the hiway off your choice, NEXT | |||
| D_adams |
wow | |||
| Froggy |
Redscuell, quit being a douche, I have no problem getting rid of you. | |||
| Puredrive |
Pffff ice on the manifold lol If it bugs you, have the dyno operator override ambient temperature to say it was a 120 degree day, and print it out again. That will make your numbers higher, if that's your goal. Reputable dyno facilities will have a separate weather station for comparison to the dynojet weather station. Always ask for the dynojet file so you can diagnose it later at home.. What I have noticed on the bike forums is that most people are given a STD correction factor dyno sheet. Which will typically yield a few ponies more then with SAE correction. I usually disregard STD dyno sheets mainly because they don't show the temp or the humidity in the dyno room. (Message edited by puredrive on April 12, 2010) (Message edited by puredrive on April 12, 2010) | |||
| Dannybuell |
Redscuell - Over the years, how many miles have you ridden on motorcycles? Twin owners tend to keep their bikes and ride more and longer than I4 owners. Do a google on 'suzuki hayabusa recall'. No brand is immune. When you give respect you receive respect. Think about it. | |||
| Kidder |
Dannybuell, Where did you get that interesting stat? | |||
| Sknight |
The question I ask guys when they're pissed about their dyno numbers has gotten me cussed out, pushed, walked away from, called a liar and sooner or later usually told I'm right. Were you happy with how it ran before the dyno run? Then what changed? The bike was advertised with 146HP at the crank. You're gonna lose 15% through the drivetrain I don't care if it's a Ninja 250 or a Top Fuel car, there's going to be losses. Usually I see an average of 125 RWHP, which is a 13% loss to the tire. I had a Hayabusa, advertised at 178HP at the crank usually stock they'll put down 150-155 at the tire. Buell advertised the bike at 146 at the crank, they seem to be right in line according to the dyno numbers. Is 120 low? Could be. Altitude, humidity, barometric pressure, air pressure in the tire, the compound of the tire, how long it's been since the dyno had it's bearings greased or a calibration done all play factors in results. In fact I could sit here for an hour rattling off the variables. A dyno run is best used to establish a baseline for future mods. So my question remains, were you happy with it before getting strapped to the dyno? If so then what's the problem? (Message edited by sknight on April 12, 2010) | |||
| 98s1lightning |
I was and still am happy, I just thought it would pull a bigger number. A TL1000 was only 12 under mine but he did have pipes and a Power Commander. Its not that I was really PIZZED, just had a different number in my head. I will do a retest right after I get the pipe on it. | |||
| Kidder |
Is pizzed madder than pissed? | |||
| Leechykyle |
I don't know what mine is putting down, but I'm proud of it no matter what. A friend of mine has a new GSX-R750 and is afraid to ask me to the drag strip because he's afraid he'll get beat. I chalk that up as a win. (Message edited by LeechyKyle on April 12, 2010) | |||
| Stirz007 |
Sknight - I think you're pretty close to spot on. If I figure 146 ideal Hp (sea level, 70 degrees, at the crank), and assume 15% loss through drive train, and another 2% or so per 1000' elevation, then the math says I should be at about 124-125 RWHP at sea level and about 113 at 4500' elevation (where I live). The machine says I'm making 118, which is within the 5% or so you would figure for variances between dynos. Am I dissatisfied? - NO (although more is usually better). Now I have a baseline to compare to when I start adding the cool gizmos I got from EBR. That's all I was looking for - not absolute numbers (my wanker is bigger than your wanker - it's not the size of the wanker, but how you ride it that counts - or so I've been told) | |||
| Sknight |
98 that's great to hear and totally reasonable. And frankly I'm a power nut myself, I genuinely miss the WOT pull my Busa had. Hell I miss the fact that it would easily roll away from 30MPH in sixth gear! I can tell you this, looking at the intake ports and RPM potential of these engines it would be easy to make big power. If you wanted to. Right now I'm still getting used to how a real super sport handles, maybe after the warranty is up we'll see about some enhancements. I've heard it's the motion of the ocean, not the size of the ship. Well, you're not getting to England very fast in a rowboat! | |||
| Dirty_john |
Anonymous is correct, when I was undertaking a mech engr degree here in the UK in the late seventies we did a lot of dyno runs of 4 cylinder engines Ford UK had given to the tech college I went to and it was surprising that even using correction factors for ambient air temp, barometric pressure etc - the same engines run on different days produced so much variation, even using the same fuel so I am not surprised that dyno test data is all over the place - it can only be used when tuning so see comparative effects and only when a short time interval occurs between dyno runs, how many dyno operators can measure specific fuel consumption and build those correction factors into the picture? |
