Discuss How much does altitude affect engine power? on AllFordMustangs.com, the place for Mustang enthusiasts.
Welcome to our Mustang forums where Mustangers come together to hang out, discuss and enjoy their favorite Mustang hobby with fellow Mustang enthusiasts. We invite everyone to read, post, and enjoy our Mustang forum as well as the many other sections of our site.
You are currently viewing our forums as a guest. By joining our community you gain access to post topics, communicate with members, upload your photos and access many other special features. Registration is fast, simple and free so why wait, join our Mustang community today! If you have any problems with registration or your account login, please contact support.
hey guys, i just recently moved from sea level to colorado springs (6000 feet) and my stang is running alittle sluggish, anyone heard of power issues from being at such high altitude? is there a way to reset the computer to adjust for the thinner air or will it adjust automaticly?
it adjusts to keep the AF ratio right (although the tables are always a little conservative, so you will usually run a tad more rich, nothing excessive though). However, thinner air has less oxygen, so despite the computer correcting the fuel table for less air, there is still less air to burn in the same volume, so unless you increase your displacement (ie bigger motor), or force more air in with a forced induction, you are always going to lose power. Even FI cars lose power, and nothing automatically restores it.. The "upside" is, with less oxygen, you can run lower octane on the same AF and spark advance.. Not much consolation, since you lose power either way, and don't fuel up in a high elevation area then drive down to sea level if your tune is for 93 octane..
Sold: 2006 GT Premium Vert, 5 spd, Tungsten Grey
New toy: 2001 Porshe Boxster S
stl by your calculation i am losing 52 hp at 6000 feet, didn't plan on going forced for a while but now i may look more deeply into it
But on the + side, you can drive faster and get the same MPG or you will get better MPG at the same speeds than you did at sea level.
Did you Join the Air Force? Pilots deal with the effects of altitude a lot. Its a huge performance factor for their machines.
2008 manual GT with deluxe trim, Edelbrock e-force, FRPP GTB Mufflers. 3.73 gears, Coast Ultralight Drive-shaft. 18" OEM Polished Bullitts, Webelectric Sequentials, XM built into the Shaker 500. Alarm and Escort RedLine.
General aviation piston engines are designed to run at 75% of max power at altitude. They have adjustable mixture controls that the pilot adjusts by using an exhaust gas temp indicator. It it generally accepted that it is no longer possible to get that 75% power above 5000ft. Outside air temp and humidity has an affect also.
I wonder if there is a tune that will adjust the mixture better for a high altitude area like Denver. Dont know if the stock Ford tune has that much adjustability built in. That would be worth a call to a tuner locally to see what they say.
05GT, 09 GT500 Drivetrain, 2.6 pulley, JLT intake, 18x9.5 GT500 wheels, 14" Brembos, Steeda: Front strut pads, rear Watts link, X5 ball joints, Vogtland GT500 L Springs, Tokicko D-Specs, GT500 Front lower control arms, BMR:K-Member, Tube rad support, adj upper third link, rear relo brackets,JBA long tubes and catted mid pipe, Stillen adj front & rear sway bars, Bump steer kit, Steeda shifter, Spydershaft Aluminum DS.
John Lund tune, 568 rwhp, 560 tq.
My experience is this: I live in Western Colorado at 4800'. Stock my car dyno'd at 255 while my uncles car (same basic setup) dyno'd at 265 in Texas. Several factors must be taken into account air temp, type of dyno etc. When I went SC (saleen via brenspeed) their Vetter killer package with a 3.4 (6-7 psi) pulley only dyno'd at 400 rwhp and 400 rwtq, went to the 3.2 (7-8 psi) pulley and the power jumped up to 430-440 (depends on tune) and 420-440 tq. I am now running a 3.0 pulley (9-10) psi but I have not strapped it down since switching to the smaller pulley. According the crew at Brenspeed the computer should adj for the altitude once a good tune is loaded. So far I have had zero luck finding a good tuner in colorado.
Altitude definetly had an effect on what the SC was able to put out.
Just my experience for what it is worth.