How much power does an ST1300 lose after break-in miles?

dduelin

dduelin

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Location
Jacksonville
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R1200RT NC700XD
2025 Miles
009566
My ST1300 still pulls the same top speed it did when new and burns no measurable oil between oil changes but until I got a second dyno run today on my 2005 I wouldn't have believed it hasn't lost any horsepower or torque. I know that no two dyno runs are the same with variables of temperature, air density, fuel additives, etc. but these two are close and the second is actually more powerful by 3.8%. The runs are on the same dynometer (to my knowledge - it's at the same shop) and were done by the same tech as 6 years ago. 4th gear roll on.......20 to 128 mph in 7.7 seconds.

2008 @ 44,165 miles



2016 @ 158,187 miles

 
Welcome to the world of DYNO's LOL
Rules of thumb :
1. not all dynos are the same
2. see rule #1

years later maybe different fuel, different ambiant, different baro, different firmware, different drum, different program, etc
 
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thekaz said:
Welcome to the world of DYNO's LOL
Rules of thumb :
1. not all dynos are the same
2. see rule #1

years later maybe different fuel, different ambiant, different baro, different firmware, different drum, different program, etc
Click to expand...
Yes, I think I mentioned that.

Still, compared to these two on my bike 114,022 miles apart and the other published ones I have @ 106.1/81.6, 111.3/81.6, 111.1/83.1, 113.0/84.5, 114.7/84.3, 113.8/84.3, 114.1/83.5, 111.4/83.1 and 110.1/81.7 there are plenty of data points to infer for the mileage....... mine's not too shabby. :)
 
I keep my window up and door locked on my ST1300, so no one can Break In.......:)

ToddC


PS. I'm keeping my day job
 
Well with that I think there is only one thing to do and that is to go out and ride that ST some more.
 
I'm going to assume that a modern liquid-cooled motorcycle would be similar to a cage in this respect. Most long-term tests that I've read on various autos indicate improved performance at 30-40k compared to new, so my guess is that an ST would gain power after break-in, not lose it. Obviously, there is a point where this trend would peak and start to drop off, but I have no idea where that point might be, though I'm sure it would vary considerably from one bike to another based on how it has been maintained, abused, etc.
 
dduelin said:
Yes, I think I mentioned that.

Still, compared to these two on my bike 114,022 miles apart and the other published ones I have @ 106.1/81.6, 111.3/81.6, 111.1/83.1, 113.0/84.5, 114.7/84.3, 113.8/84.3, 114.1/83.5, 111.4/83.1 and 110.1/81.7 there are plenty of data points to infer for the mileage....... mine's not too shabby. :)
Click to expand...

I think I was in a way being sarcastic. Coming from a drag bike world my ZX12R can be more than 5% on the same day for a variety of reasons. When looking at dyno sheets the fun part is putting a ruler on the torque to see how flat it is crazyloco.gif
 
Hello Dave:

The first thing that I would suspect accounts for the difference (3.8%) is calibration of the dynamometer. You mentioned that 6 years have elapsed between the two runs - it is entirely possible that friction / resistance within the dynamometer has increased by 3.8%, and your motorcycle is more or less unchanged.

You might want to investigate how, exactly, the service facility calibrates the dynamometer.

Another way you could investigate (validate) the results might be to use the same dynamometer to measure performance of a much newer ST 1300 - for example, a 2012 model, if someone in your neighborhood happens to have one.

Michael
 
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