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Dyno Run Question

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Local HD shop 1/3 mile from home, has a dyno that will do 3 passes & printout for $70. I personally would like to give it one go in it's stock form. Then complete my Yosh RS3, FCR MX, FC2000 mods. and see what I have gained. Would a Trail Wing be accurate enough for a dyno test, or woud I need a more street oriented tire?

HH

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$70! Geez that is pretty high. Three runs are $25 at a local shop near me. Hell I think Burned gives local TTers freebies as his standard operating procedure.

Trailwing would probably be sufficient.

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$70! Geez that is pretty high.

Yeah, but everything else in that store represents HD (Hundred Dollars) No matter what it is.

HH

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That does seem expensive. Then again I don't know anyone around here that has a Dyno so don't know how much they would charge. BTW why kind of tire does Burned use? On the pics of my CR on the Dyno it looked almost like a bald street bike tire or something I couldn't really tell.

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On the pics of my CR on the Dyno it looked almost like a bald street bike tire or something I couldn't really tell.

That picture is the very reason I posted this question.

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The trailwing would work fine. You'd have to use it again at the same pressure on the after-mods dyno run.

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It's $70 because it's at a Harley shop. They cost more because they give a higher reading to make the HD guys think they got 100's of hp with their screaming eagle mods. :thumbsup:

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The trailwing will not be accurate, there will be some slipping. At least that is what I've been told by a couple of dyno operators. A street bike tire is the best option if you can find one.

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The trailwing will not be accurate, there will be some slipping. At least that is what I've been told by a couple of dyno operators. A street bike tire is the best option if you can find one.

correct me if I'm wrong but won't tire size affect the final reading. Example: A 110/100-18 will give a different reading (higher or lower I don't know) than a 190/50-17? Not that a person would use these 2 tires they're just the 2 that I can think of.

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if you want a actual reading the trail wing doesnt cut it.to much slip.you need a smooth tire.

Would the trail wing give me a "Close enough" apples to apples test before & after?

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gearing and tire size have no effect on readings.for example they make the same power in every gear.

When I had my Z1000 dynoed they did it in 5th gear(it's a 6-speed). They said if it's a 6 spd they do it in 5th a 5spd 4th etc. You're saying they could do it in any gear 1st-6th and the reading would be the same.

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hp and torque would be the same yes, provided you could get the traction. That is one reason they don't do it in the lower gears I think.

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When I had my Z1000 dynoed they did it in 5th gear(it's a 6-speed). They said if it's a 6 spd they do it in 5th a 5spd 4th etc. You're saying they could do it in any gear 1st-6th and the reading would be the same.

except in the lower gears you will just spin the tire on the dyno.same power.

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