Not Sure If Bike Was Dynoed In Right Gear
#12
10-20-2011, 06:28 PM
As I posted on Fletch's other thread, I have a hard time accepting that a 5th gear pull will yeild higher numbers than a 4th gear pull.
I called my local dyno tuner today, and made an appointment to test and tune my 96" Evo next week.
To expand a little on what I posted, my local guy explained that he normally tests in 4th gear because it's easier on the engine (less time at WOT), and for safety reasons, i.e.wheel speed, and he is generally testing for tuning purposes, to monitor A/F ratio, rather than max output.
He has never done a 4th to 5th gear comparison, but agreed to do one for me.
I called my local dyno tuner today, and made an appointment to test and tune my 96" Evo next week.
To expand a little on what I posted, my local guy explained that he normally tests in 4th gear because it's easier on the engine (less time at WOT), and for safety reasons, i.e.wheel speed, and he is generally testing for tuning purposes, to monitor A/F ratio, rather than max output.
He has never done a 4th to 5th gear comparison, but agreed to do one for me.
#13
10-20-2011, 06:30 PM
#15
10-20-2011, 06:46 PM
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#16
10-20-2011, 07:12 PM
Yes this supports what my tuner has told me as well. He uses 4th on 6 speeds due to tire speed, he has had a failure and is a little gun shy of more failures.
#17
10-21-2011, 08:25 AM
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I did more research last night, and realized that I've been looking at this from the WRONG perspective, and overlooking the fact that on an inertia dyno the computer ignores the mechanical advantage of a lower gear by computing power from acceleration and velocity...
Part of the problem is that all of the explanations I have read are different, and all have something that sets off my BS meter...
At any rate, I apologize.
There is a pretty good series of articles on dyno testing in American Iron magazine, written over the years by "Dr Dyno". His web site has links to the various articles. However, he sets off the BS meter by talking about adjusting the "back pressure" to correct torque curves
Part of the problem is that all of the explanations I have read are different, and all have something that sets off my BS meter...
At any rate, I apologize.
There is a pretty good series of articles on dyno testing in American Iron magazine, written over the years by "Dr Dyno". His web site has links to the various articles. However, he sets off the BS meter by talking about adjusting the "back pressure" to correct torque curves
Last edited by Panshovevo; 10-21-2011 at 08:28 AM. Reason: Correction in wording
#18
10-22-2011, 06:45 AM
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I did more research last night, and realized that I've been looking at this from the WRONG perspective, and overlooking the fact that on an inertia dyno the computer ignores the mechanical advantage of a lower gear by computing power from acceleration and velocity...
Part of the problem is that all of the explanations I have read are different, and all have something that sets off my BS meter...
At any rate, I apologize.
There is a pretty good series of articles on dyno testing in American Iron magazine, written over the years by "Dr Dyno". His web site has links to the various articles. However, he sets off the BS meter by talking about adjusting the "back pressure" to correct torque curves
Part of the problem is that all of the explanations I have read are different, and all have something that sets off my BS meter...
At any rate, I apologize.
There is a pretty good series of articles on dyno testing in American Iron magazine, written over the years by "Dr Dyno". His web site has links to the various articles. However, he sets off the BS meter by talking about adjusting the "back pressure" to correct torque curves
Dr Dyno, Fred Eno, lives in Conn.
American Iron Magazine is in Conn.
They like to keep things close to home.........we know.
Fred is a "Dyno Gypsey" going to large biker gatherings, and tuning.
OK guy from what we know of him when we have met, and imagine he has tricks up his sleeve.
Scott
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