07-21-2017, 08:37 PM
I'm not really familiar with props, but my thoughts are that in the same water conditions, the prop shouldn't be affected by altitude.
Since you're running an EFI motor, there's not a ton you can do with it unless you had a way to remap the computer. Air is less dense at higher elevations and the computer should be able to compensate for it to some degree. The first thing you can try is to reset any learned trims by disconnecting the battery for a bit.
If your distributor or cam angle sensor has an adjustment, your biggest gains will be had by increasing the base ignition timing by 2-3 degrees. Do this with a timing light and be sure you know the procedure for setting base ignition timing for your specific application. There's usually something that needs to be either unplugged or grounded out to disable fluctuations in the timing map that are constantly being made by the ecu to adjust for load and whatnot. You'll also wanna set it back to more of a factory setting once you get back to a lower altitude, as it will be too aggressive and may exceed any safety margins built into the original timing map. Once you understand it, its a 5 minute procedure that I think is worth doing. Good luck.
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Since you're running an EFI motor, there's not a ton you can do with it unless you had a way to remap the computer. Air is less dense at higher elevations and the computer should be able to compensate for it to some degree. The first thing you can try is to reset any learned trims by disconnecting the battery for a bit.
If your distributor or cam angle sensor has an adjustment, your biggest gains will be had by increasing the base ignition timing by 2-3 degrees. Do this with a timing light and be sure you know the procedure for setting base ignition timing for your specific application. There's usually something that needs to be either unplugged or grounded out to disable fluctuations in the timing map that are constantly being made by the ecu to adjust for load and whatnot. You'll also wanna set it back to more of a factory setting once you get back to a lower altitude, as it will be too aggressive and may exceed any safety margins built into the original timing map. Once you understand it, its a 5 minute procedure that I think is worth doing. Good luck.
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