C4 Vacuum pump
Race Director
Joined: Apr 2003
Posts: 17,700
Likes: 1,667
From: moraga ca
Oh, part 2 of the question. In addition to Jim's answer, it is safe to run from a low altitude to a higher altitude. The motor will run slower and richer. If the car is set up for high altitude and ran down at sea level, the motor could run dangerously lean and kapow! 
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Melting Slicks
Joined: Mar 2002
Posts: 3,108
Likes: 126
From: S.L.C. UT
Exactly, I have no idea where my air/fuel is above 91kpa. That is as high as it reads here. Sealevel guys would see upwords of 107kpa. I would have to tune it before I raced at sealevel.
Burning Brakes
Joined: Nov 2010
Posts: 1,006
Likes: 2
From: Spartanburg South Carolina
Gottcha! thanks for that info. I finally found out how to calculate it. It's actually called Density Altitude. Found an app for my droid phone that calculates it. I'm sitting at 777 ft DA right now 
Race Director
Joined: Apr 2003
Posts: 17,700
Likes: 1,667
From: moraga ca
