Dyno Run - Wrist Twisters
 
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post #1 of 9 Old 09-12-2009, 08:25 AM Thread Starter
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Dyno Run

So one of my customers owns a 919 and brought it to the shop this morning for a dyno run. He fabricated his exhaust by cutting and rewelding the single portion of the head pipe that runs to the y-pipe. turned it out and cut a scorpion can in half. Just to make everything clear he is running a 15 tooth front sprocket and premium fuel. No power commander.

His dyno numbers came out to 99.08 hp - 61.79 lbs torque and afr of 13. The afr and torque curve was flat all the way across the chart.

I thought that was pretty good numbers for a cheap exhaust mod.

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post #2 of 9 Old 09-12-2009, 10:56 AM
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that looks like a power loss to me...

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post #3 of 9 Old 09-12-2009, 11:04 AM Thread Starter
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in stock trim the bike is 96 rwhp and 60.7 torque.

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post #4 of 9 Old 09-12-2009, 11:17 AM
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Quote:
Originally Posted by Basspiece919 View Post
that looks like a power loss to me...
Unless that is a profoundly low reading dyno, I agree. Also, I don't remember seeing 96 rwhp as the stock number.

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post #5 of 9 Old 09-12-2009, 12:16 PM
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Just under a hundred seems to be where the stock ones fall.

Mine, basically stock, pulled 107 in the day with a few mods, but the differences in dyno's, weather, what "horsepower" (SAE, Standard, etc) you are using, a lot of variables.....

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post #6 of 9 Old 09-17-2009, 07:38 AM Thread Starter
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The stock numbers I supplied are from a dyno run on my bike a while back. It is completely stock. According to Honda the hp at the crank is 107. Taking into consideration an approximate 10% loss in hp from the crank to the rear wheel then 96 rwhp would be about right.

I'm no engineer but I'd say a 3 hp gain at the rear wheel is pretty good for a simple exhaust mod.

Maybe Lord Duckhunter is lurking around somewhere and can weigh in on this matter.

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post #7 of 9 Old 09-17-2009, 08:01 AM
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Another Dyno Thread? Let the Scrapping begin!

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post #8 of 9 Old 09-17-2009, 08:29 AM
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Wanna hear about my knee instead?

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post #9 of 9 Old 09-17-2009, 09:14 AM
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The numbers themselves mean nothing without the chart.

I've seen Two Mothers full systems put a decent peak number on the 919, but actually hurt the mid-range performance. It's all about the power curves on the graph...

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