120R update and answers
#31
09-20-2010, 03:53 PM
That's a helluva deal from Zanottis. Hadn't even considered the discount price. Does that include shipping?
Zach
#32
09-20-2010, 04:05 PM
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#33
09-20-2010, 04:14 PM
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You kind of lost me here. Dyno runs never start in 1st gear from a dead stop.
Most graphs start around 1800 - 2000 rpm in a high gear (5th or 6th, whatever gear gives a 1:1 ratio). There is also a time lag on the dyno's ability to sample the information and calculate the performance. If you were to run a bike in 1st gear on the dyno it would likely not have enough time to sample the data because the bike would rev so quickly.
While I agree the run the OP posted is not in the "normal" set-up of RPM rather than speed, it does accurately depict the curve of the power the motor is making. It would just be easier to relate to other builds if it was using RPM.
My best guess is that run start at 2000 rpm and ends around 6200. Would be nice to know what gear it was done in for sure though.
I have no idea what your experience level is, so don't take this the wrong way.... here is a video of my bike being run on the dyno. This is typical of the process to check WOT performance after some MAP modifications were made. This process repeats dozens of times or more throughout the process of a tune. The actual sampled run starts at about the 27 second mark. The gear changes leading up to that point were just to get up to speed in 5th gear. He always does at least 2 runs after every change.
http://www.youtube.com/watch?v=eGSLbbhELfs
Hope this helps
Zach
Most graphs start around 1800 - 2000 rpm in a high gear (5th or 6th, whatever gear gives a 1:1 ratio). There is also a time lag on the dyno's ability to sample the information and calculate the performance. If you were to run a bike in 1st gear on the dyno it would likely not have enough time to sample the data because the bike would rev so quickly.
While I agree the run the OP posted is not in the "normal" set-up of RPM rather than speed, it does accurately depict the curve of the power the motor is making. It would just be easier to relate to other builds if it was using RPM.
My best guess is that run start at 2000 rpm and ends around 6200. Would be nice to know what gear it was done in for sure though.
I have no idea what your experience level is, so don't take this the wrong way.... here is a video of my bike being run on the dyno. This is typical of the process to check WOT performance after some MAP modifications were made. This process repeats dozens of times or more throughout the process of a tune. The actual sampled run starts at about the 27 second mark. The gear changes leading up to that point were just to get up to speed in 5th gear. He always does at least 2 runs after every change.
http://www.youtube.com/watch?v=eGSLbbhELfs
Hope this helps
Zach
Yeah, first gear...I'm brilliant (LMAO) ...Okay, not so much. Meant to put something in that would give you more of what I was trying to say...meaning the normal start of a Dyno sheet is like 1500 or 1700 rpm or so.
So much for my brain being in-tact after the weekend. LOL
'nuf said, numbers look fairly good regardless.
#34
09-20-2010, 04:21 PM
5th Gear
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#35
09-20-2010, 04:27 PM
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You have to be a member for at least 30 days and have at least 25 posts I believe. Go over in the games section, it's an easy way to get your post number up. Please post up a dyno sheet asap.
#37
09-20-2010, 04:44 PM
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#38
09-20-2010, 04:45 PM
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The cross-over point in any power v torque curve is always the same, at around 5,250rpm. Can't remember the exact figure, but it is a constant for all engines.
This engine is geared at almost exactly 25mph/1,000rpm, which sounds like fifth gear to me. That is in line with using the gear that gives direct drive.
This engine is geared at almost exactly 25mph/1,000rpm, which sounds like fifth gear to me. That is in line with using the gear that gives direct drive.
Last edited by grbrown; 09-20-2010 at 04:48 PM. Reason: Added para.
#39
09-20-2010, 04:55 PM
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