Racecar Book.com » high altitude http://racecarbook.com Books and Information for drag racers Wed, 21 Mar 2012 17:41:58 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 Setup info for high altitude http://racecarbook.com/bobsblog/races/setup-high-altitude/ http://racecarbook.com/bobsblog/races/setup-high-altitude/#comments Tue, 16 Dec 2008 06:00:20 +0000 Bob http://racecarbook.com/?p=170 One of our customers ran 6.8 second quarter mile time in a match race funnycar at a racetrack that was 50′ above sea level (high air density).? Then he towed to a racetrack at 5,500 feet above sea level (low air density).? Using the math in the Fuel Injection Racing Secrets book and the 5000 Horsepower on Methanol book, his setup was computed for the high elevation track with low air density.? The setup from the computation was put into the racecar in preparaion for the high elevation event.? Then, off the trailer, he ran 6.8 seconds and was low qualifier for that match race event.

This illustrates the importance of tuning your car for it’s location. Higher altitudes have less oxygen in the atmosphere so the air-to-fuel ratio needs to be adjusted accordingly. Otherwise the same engine can perform extremely well or bad depending on the atmospheric conditions at the track.

]]> http://racecarbook.com/bobsblog/races/setup-high-altitude/feed/ 0 Bonneville Racing Tips http://racecarbook.com/bobsblog/races/bonnevill-racing-tips/ http://racecarbook.com/bobsblog/races/bonnevill-racing-tips/#comments Thu, 16 Oct 2008 01:09:31 +0000 Bob http://racecarbook.com/?p=141 We made the trek to Bonneville only to find it was rained out. Luckily, while we were there we learned a few things from racers in the area.

Tip #1 To go over 420 MPH, 4 wheel drive is probably necessary to overcome the air resistance.

Tip #2 One engine builder cautioned me that he put 20% nitro in his normally aspirated race engine that previously ran on straight methanol.? He said that he made numerous jetting adjustments and no matter what combination that he tried, the racecar slowed down.? (FYI: another experienced nitro racer said that he was successful at making more power with any percentage of nitro — high or low.? As a result, we are currently researching nitro for a possible future publication to reveal the cause of differences such as this).

Tip #3 The air is thinner and easier to go fast in. This is especially for forced induction engines that can use supercharging to overcome the loss in air density to the engine.

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