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High altitude timing

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Old Sep 22, 2012 | 06:03 PM
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From: Redstone, CO
High altitude timing

So where should I set the timing on my 460 if I live at 8000 feet? Also, I'm not exactly sure how the distributor should be lined up. Is TDC at 0 degrees or at the bigger line that is closer to 5 degrees? Where should I have the timing sitting when I drop the distributor in at the #1 position?
Thanks
 
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Old Sep 22, 2012 | 06:57 PM
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Leave it at 10* BTDC. The computer will make any necessary compensations for altitude.
 
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Old Sep 22, 2012 | 08:34 PM
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Yup nice thing about EFI, automatically compensates for altitude changes via its barometer.
 
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Old Sep 23, 2012 | 12:02 AM
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So drop the distributer in at TDC (timing mark 0) and then set the timing at 10 BTDC once I get it going? What's that other line that's on both sides of the scale at about 5 ATDC?
Thanks for the info...
 
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Old Sep 23, 2012 | 01:05 PM
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I lived at 7700' and played with my timing once. It pinged at hard throttle at 13* base timing...so it doesn't need to be changed over low altitude. Its now somewhere under 11* so it doesn't ping.
 
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