Over drive vs. corrected altitude?

If memory serves me right, there is an equation if you will, on how much more to overdrive your huffer to compensate for a rise or drop in corrected altitude. Am I right about this or just imagining this?


Thanks,
Bob

 

You're thinking down the correct lines. I don't know the equation right now. I don't do this, but I also only vary from about 5500 down to 2700 vs. if you were to run at Denver vs sea level.

The other reason I don't is because I keep the OD at the max permitted by the rules.