Slowbra302

As the title suggests, I am temporarily stuck at a high altitude. My 91 performance tune was written for Oceanside, CA and I am currently in Prescott, AZ..... Wife failed to mention her parents moved to the mountains, and I never even thought of asking. So now I am at 5300 ft above sea level as opposed to sea level. We are leaving on Wednesday morning....

My question is, how dangerous if at all, is it for me to drive / beat on my car this high up, or is there just going to be a noticeable loss of power? Anyone who has extensive knowledge pertaining to this feel free to give a huge reply. I do understand the basic methodology behind the thinning of air, just want to concrete reassurance!

Thanks again all!

speedycpu

If you look at your fuel trims you'll notice they're changing as you change altitude. So, assuming you're running the octane fuel your tune is set for you should be fine as your FT's are being auto-adjusted as the oxygen is reduced.

As far as HP loss, at 5300 ft vs sea level depending on temp, baro, etc, you're likely looking at around 80-82% of your original power. Thus, if you're 450 crank HP @ sea level you're at 360-370 crank HP now.

I wouldn't worry about it too much and have fun. Maybe while you're at it you could get an app that uses the accelerometer to test 0-60 times, 1/8th and 1/4 mile times so you could compare 5300ft vs sea level. If you have an SCT tuner it would be neat to see your logs too @ 5300 vs 0, and maybe you could have someone montior your STFT & LTFT's while you descend back down.

Dynolicious is pretty good for iOS devices, not sure about Android devices, still trying to find something good for my Nexus 7 & POS Galaxy S.

Slowbra302

Thanks, just the response I was looking for! Drove some today and the only thing weird besides the power difference is, the car doesn't engine brake at all. It coasts a lot like an automatic. I am equating this to the altitude though.

As for the 0-60 and other track times, I do have the track apps and want to test them. Probably be terrible due to the mickey thompsons I have on and the cold weather. I'll look around to see if there is a spot and report back.

As for the drive up, every turn was switch backs and hairpins and I was able to grip and run 2nd out a couple of times wih every turn being a 15mph and 20mph warning speed! Makes me want to auto cross this car bad!!!! Soooooooo much fun!

Thanks again!

Lethaldosage423

I'm in Fallbrook!
Glad you got your question answered. I can't belie how these new mustangs handle!

Slowbra302

Yea no kidding! I came from a 95 cobra to this. Huge amour of changes over 18 years! I for one am glad we have the last years of the live axle!