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Have an A model that has been dynoed in Houston. Will be riding 1500 miles or so through the entire state of Colorado over the next week or so. Am I looking at any appreciable performance differences due to altitude in excess of 10,000 feet?
 

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Barrister said:
Have an A model that has been dynoed in Houston. Will be riding 1500 miles or so through the entire state of Colorado over the next week or so. Am I looking at any appreciable performance differences due to altitude in excess of 10,000 feet?
I'm far from expert, but I would say no. This is not carburation - the EFI has a MAP (Manifold Air Pressure) sensor, and I would think that the pressure sensor would help the EFI compensate your mix for the thinner air...

I could be wrong, though...
 

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I'm in Colorado now with my Kaliforia spec 03 VRSCA and the only difference I see is better fuel economy. And the daily afternoon rain. Have a great trip.
 

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Check that P clamp!
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Barrister said:
Have an A model that has been dynoed in Houston. Will be riding 1500 miles or so through the entire state of Colorado over the next week or so. Am I looking at any appreciable performance differences due to altitude in excess of 10,000 feet?
I rode to the top of Mount Evans in CO a few weeks ago and didn't notice any difference. You can't get any higher than that(14,288')on pavement in the US.
 

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I regularly ride 7 to 10K feet. little less power, hardly noticable though.
 

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I suspect it depends a lot on how good your tune was. The factory tune works well at all altitudes. The ECM should compensate. If at high altitude,however, if your tune is lean or rich anywhere, it will likely be more noticeable. Its been my experience that gas mileage usually improves at altitude.
 
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