[url=https://www.classicgoldwings.com/forum/viewtopic.php?p=99737#p99737:1kzbj20q said:
AApple » Sat Oct 12, 2013 2:28 pm[/url]":1kzbj20q]
I can't ride a dyno down the hiway.... :moped: :mrgreen:
You bring up an interesting point. I agree with you! People get too caught up in the "show me on paper" comments that just make everyone argue.
Running anything on the dyno can teach you many things:
air-fuel mixture from low to high rpm
rpm versus time (how long does it take to reach a certain engine rpm)
jetting versus torque (how your air-fuel mixture changes the torque curve)
coil or ignition failure (drop off in torque at high rpm due to points bounce or lack of coil saturation)
temp/pressure/torque relations (often we run a machine on different days. Changes in air temp, humidity, and pressure all have effects on torque)
What it does not show:
How quickly an engine starts...especially when cold
idle quality (does it have a steady idle, and how low will it idle without surging or coughing)
mileage
engine sound (yes, you can hear the difference. Individual cylinder firing can be heard. The tone changes with a true multi spark ignition...just ask Joe/Dan/Wilcoy/Skiri and others that are installing them right now.
Lastly - reaction to weather changes (does it run the same on a foggy day as it will when its dry? Cold or hot weather? For those of you thinking weather can't affect points or magnetic pickups, I would argue long and hard that you are mistaken)
What do you use dyno data for?
We study dyno charts, looking for things that make our ignition look better than the competition, right?
Sure that's fun...but the real study for us has been air-fuel mixture changes, and how timing relates to that curve.
More timing advance can improve slight rich conditions. Engines like to be rich for peak power, lean for peak mileage (to a point). Engines actually drop in horsepower when you pass a certain number on the air-fuel chart, and we look for ways to create timing curves that fix common cross over issues in carburetion. GL1000's run very lean until 3,000 rpm and run fairly steady to around 5,000 when there is a slight richness on many bikes, and the power dips. If we advance timing slightly in that area, we can smooth the power curve without expensive carb work.
Ignition improvements dont fix carb issues, but timing adjustments can be used to help inherent deficiencies in carb setup that can be "felt" when riding. A dyno simply helps us discover new ways to make Oldwings run better. That's why we are all here, correct?
So get off the computer and go for a ride already!!