| Author | Message | ||
     Ds_tiger |
I said I wasn't going to dyno this pipe- but the hair got up me to do it. Not stealing Rob's thread thunder (Carbonbigfoot)- he has agreed to do before during and after with drive by audio/ video etc. Much more comprehensive than I would be willing to do... AF1 Racing (Apriliaforums.com) in New Braunfels, TX dyno'd the bike on their Factory Dyno- not a Dynojet. According to Micah at AF1, there is a 17% low read on his compared to a DJ. He (Micah) also took video/audio of the dyno run and he is going to post it on his web site in a couple of days or so - because, apparently there are a lot of people in the Rotax Aprilia world curious about the 1125 Buell. link where it will be posted is here> http://www.apriliaforum.com/forums/showthread.php?t=87119&page=181 If you do the math on the dyno numbers it works out to 143.9 RWHP at 10,500. Micah seemed impressed with the motor. He does not impress (dyno results) easily- from what I have come to learn. Bike is stock, with outer airbox lid removed, and a Drummer pipe. AF value F was 115.5 and rear was 100.0 Nice 80F day.  | ||
| Hogs |
WoW thats some GooD looking REar wheel horsePower Numbers... So are ya saying thee other dyno wd. be a lesser amount etc? ( couldn`t see it to me 17 PERCENT more ? ) Any Ideal on the Torque Numbers really interested in knowing them??? Nice to see the A/F ratio as well across the Board? Note: Never mind I just seen that is with doing the MATH...! Thanks (Message edited by hogs on March 06, 2009) (Message edited by hogs on March 06, 2009) | ||
| Ds_tiger |
The peak torque number was 69 ft -lbs, so that correlates to a 80.7 FT-LBs DJ number Micah says the dyno reads low compared to what a DJ dyno reads. If you want "Dynojet" numbers to compare- in this HP range - you need to multiply by 1.17 | ||
| Hellgate |
Micah is the sh*t! AF1 uses a Factory Pro dyno, eddy current. I'm not going to get into the FP vs. DJ war, but, FP and and a 4 Gas EGV is the way to go. http://www.af1racing.com/dyno_tuning.htm | ||
| Carbonbigfoot |
Ho Lee $***!!!! That's just awesome. How many miles since installation? Looks like mine will ship Monday, and I'll have the second round done late next week, UPS notwithstanding! R | ||
| Ds_tiger |
1000 miles since I put it on | ||
| Fresnobuell |
From af1 website: "Expect your HP numbers to be around 12-17% lower with our dynamometer when compared to inertia-type dynes commonly used in magazines and at other shops." Why 17% lower and not 12%? also, isn't a HP a HP? How can dynojet have one measure for HP output and Factory Pro have another? | ||
| Ds_tiger |
I don't know This is a dynamometer discussion at this point. Google "difference between DJ and Factory dyno"- or call Mark Salvisberg at Facory Pro in NO Ca Again, I am only reporting what I have been told by Micah. | ||
| Hellgate |
Fresno - Not all dynos are the same, and all operate within a range depending on environmental conditions; heat, humidity, etc. - hence the range. Eddy Current vs. Inertia yields two different sets of results. FP is EC, Dyno is typically Inertia. So, an hp is NOT an hp. http://www.factorypro.com/ And Buell rides are Kool Aide drinkers In a nutshell - it is the Vmax's fault, good story btw. http://www.factorypro.com/magazine/dynojet_dyno_in flated_hp_reason.html Good Sh*t. Micah is working on adapting a PC3 from an Aprilia for my 11. Of course dyno results will be posted. Give me three weeks or so, I've got several projects on the fire. | ||
| P_squared |
Or, instead of getting into the 'how accurate are the #'s from that dyno' why not focus on the curves instead? #'s can be very misleading if not taken in context. We don't know what the #'s were before the pipe was installed on THIS dyno & THIS bike, so there's no way for a baseline comparison. If I'm reading/interpreting the chart correctly, looks like there are 2 'dips', 1st at ~3k rpm and 2nd at ~7.5k rpm. Otherwise, it looks pretty smooth from what I can see. | ||
| Fresnobuell |
I understand this is a dyno question, but it makes about a 6HP difference from 12%-17%. I guess my point is SHOULDN'T a dyno jet and the Factory Pro have similar numbers given the same power input? | ||
| Carbonbigfoot |
Let the @ss-Raping begin! AAAaaaaahahahahahaha!!! | ||
| P_squared |
I guess my point is SHOULDN'T a dyno jet and the Factory Pro have similar numbers given the same power input? Nope. They both use different means of measuring. Inertia vs. Eddy. So trying to compare dyno runs between 2 different bikes, on 2 different dynos, will lead you down the path of insanity. Just look at the curves & 'be happy'. | ||
| Hogs |
I agree with P_Square, Would have been nice to see a before and after comparison... But even then its still   | ||
| Jmr1283 |
different companies use different ways of getting the power read out. different ways of converting information to what we see as hp and tq. im not a expert but some companies use different methods of braking. water is used in some. theres lots of info on the net about it. | ||
| Fresnobuell |
Let the @ss-Raping begin Questions about the validity of figures posted should not be considered ass-raping. When the error range is stated as 12% to 17% and the very highest figure of 17% is used (to show the highest possible HP output), YES I will ask the question. Or should we all sit by and cheer these awesome power numbers with no baseline run? | ||
| Ds_tiger |
This isn't internet science class 101, its a regular guy posting results from a non biased - in fact even Buell skeptical Aprilia dealer and dyno facility. Whom have used this same dyno to tune AMA factory bikes. View, behold, accept or dismiss and move on | ||
| Carbonbigfoot |
Easy, man, just havin' fun! R | ||
| Fresnobuell |
Thanks for the info. Has he ever dynoed a bone stock 1125r? | ||
| P_squared |
Not cheering the numbers. And for those who are or have been cheering #'s without a baseline comparison, it's a fool's errand, IMO. Stop focusing on the HP # and the 17% and look at the curve. It 'seems' to me it looks very similar in profile to a stock curve w/ the 2 dips ~3k & ~7.5k rpm. No abrupt 'cliffs' or 'gullies' on the curves, just dips. The goal being to smooth out the curves. In that vein, I'm curious to see what can be done w/ tuning for this pipe. The 'in depth' comparisons can begin when Rob has his 2 'after install' runs done. | ||
| Ds_tiger |
Carbon Just wait till your little post Bro. I am getting things warmed up for you! | ||
| Carbonbigfoot |
Bring it! R | ||
| P_squared |
BTW, I'm still miffed you 2 (Steve & Rob) are ahead of me, but I guess I can forgive you for the posting up your results.  | ||
| Carbonbigfoot |
Hey, I've invested a lot in this whole "cheerleading" thing! R | ||
| P_squared |
"Invested" in your post count maybe!  | ||
| Xl1200r |
Personally, because there was no 'before' dyno, I'm not even going to pay attention to the numbers, 17% or no 17%. They're meaningless. What I'm paying attention to is the curve, and my eyes say the TQ curve isn't near as flat as stock. That doesn't matter much as long as the curve is higher, but without a before picture, one can't know. I'm also paying attention to the AFI numbers, which looks much better than were last reported. That is good news. | ||
| Redbuelljunkie |
apparently there are a lot of people in the Rotax Aprilia world curious about the 1125 Buell. That's because in the Rotax Aprilia world the "1125" engine was the next RSV powerplant, but when Aprilia dumped Rotax and went in-house for engine design it left Rotax without a customer for the "1125". That's where Buell jumped in and became the new customer, but with many design changes to "make it their own". To many Aprilia fans, the "1125" is the child who was given up for adoption- and they like to follow it's progress in a curious "what could have been" sort of way. | ||
| Xl1200r |
Red - where are you getting this info from? | ||
| Anonymous |
"That's because in the Rotax Aprilia world the "1125" engine was the next RSV powerplant, but when Aprilia dumped Rotax and went in-house for engine design it left Rotax without a customer for the "1125". That's where Buell jumped in and became the new customer, but with many design changes to "make it their own"." None of the above is true. Buell approached Rotax for a V-twin, and the Helicon engine was the resulting clean sheet design. Rotax knew everything that was wrong with the Aprilia engine, and what they would do better if given another opportunity for a motorcycle V-twin. But the 1125 engine was never an Aprilia project, and Buell did not pick up a Rotax design intended for Aprilia. The most Buell got from Aprilia were the thoughts of a few Rotax engineers, "We'll never make that mistake again." | ||
| Carbonbigfoot |
The "castoff from Aprilia" story sounds like the gospel according to the Aprilista faction! Funny thing about the internet... R |
