I think there are some mis-statements here...
QUOTE(70_914 @ Jun 24 2011, 06:49 AM)
Of course, then you need to worry that if you drive up a hill and the air gets thin your new engine may do another Chernobl reinactment...
As the air thins out you need
less fuel, so I would actually be safer.
QUOTE(70_914 @ Jun 24 2011, 06:49 AM)
14.7 is the best bet for a carbureted car you drive. Current cars are running direct fuel injection with baro sensors, lambda sensors, timing controls, alcohol injection to cool the combustion chambers and other tricks to make them survive at incredibly lean condiitons.
Not 100% sure about that. 14.7:1 is the theoretical best for pure gas. We have a mix of gas, ethanol, and additives. Ethanol needs to run
richer than pure gas.
QUOTE(70_914 @ Jun 24 2011, 06:49 AM)
"I know that 12.5 - 13.1 is great for WOT, especially considering we have some ethanol in our fuel." This is a little scary due to the variable amounts of ethanol you are likely to find- super unleaded isn't always regulated and may not have any ethanol, winter gas has different amounts of ethanol in most areas where it gets cold in the winter. It only takes one tank without the 5-10% mix of ethanol and you are losing your cooling effect and risking damage.
Again, take the ethanol away and I would be running too rich (on paper anyway). When I was drag racing and only tuning WOT I would shoot for 13.5:1. Now with the ethanol in the fuel I'm shooting more for 13.1:1 at WOT.
YMMV - Let me know if I'm wrong. Trying to learn all I can. I did run the 60's around town this morning and it felt fine. Head temps were fine. Gonna get it on the highway at lunch.
-Aaron