In the off season it is a good time to reflect back on a specific\u00a0event that took place this last summer.<\/p>\n
At the last race at Pacific Raceways<\/em> on July 30, 2011, Paul made a pass at 12.54 @ 106.12 MPH\u00a0at a density altitude of 1673 feet in Torri’s Tempest.\u00a0Prior to him going to Boise, Idaho for the E.T. finals, we calculated<\/span><\/strong> and adjusted<\/span><\/strong> the main jets in the carburetor and the ignition timing to minimize<\/span><\/strong> the loss of power running at higher altitude.<\/p>\n In one pass at Boise he ran a 12.758 @ 105.770 MPH\u00a0at a density altitude of 3812 feet. And the highest density altitude he ran at Boise\u00a0was 5029 feet, and even at that high density altitude\u00a0went 104.68 MPH. [Only 1.44 MPH off the\u00a0above mentioned run at Pacific Raceways<\/em>]<\/p>\n Yet we know of many Pro and Super Pro cars that came to Boise from Pacific Raceways<\/em> and saw their performance drop off markedly by\u00a0.6 seconds<\/strong> and 6 mph<\/strong> in higher horsepower vehicles. Why? Because they failed to calculate or\u00a0make any adjustments to their air\/fuel ratio prior<\/strong> to going to Boise! They were simply running far too rich at Boise and their performance markedly suffered.<\/strong><\/p>\n I recommend that our fellow racers spend some time on our Tech Tip<\/a> page where we address the need for changing main jets when going from a low altitude track to a high altitude track or conversely, going from a high altitude track to sea level.\u00a0<\/p>\n The specific article dealing with this is: Air Density & Fuel Mixtures<\/a>\u00a0which I wrote in February 2004.<\/p>\n I have a lot of information on that page that may help your program and it’s all for free. You just might\u00a0learn something!<\/p>\n Roger Young – Edwards & Young Racing, <\/em>bear317@aol.com<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":" In the off season it is a good time to reflect back on a specific\u00a0event that took place this last summer. At the last race at Pacific Raceways on July 30, 2011, Paul made a pass at 12.54 @ 106.12 … Continue reading