matyellott

Guys I have always wondered about this, when a mustang (v6,v8, shelby,etc) is delivered to a hihgh altitude market (I live in Denver) is that car tuned for the specific issues that arise with operating an engine with less O2? I am a pilot and a huge Mustang owner/fan, it seems to me that if an engine wasen't tuned for this type of thing that a number of issues could arise.

Thanks to all who reply
Semper Fi

danbevsv6rumbler

Good question... I know from previous motorcycles that altitude effects performance... but that's with the carburetors and jets and those fun things - all of which the EFI replaced in the modern car... my best guess would be that the computer compensates for this, but maybe one of the more experienced tuners could give you a better answer.

howarmat

no they dont......if you read in the manual it states some pinging might occur and to use higher oct gas....that is their solution

danbevsv6rumbler

If its in the manual... I stand corrected

Lifter583

I asked Seth at Brenspeed that exact thing, living in the mountains as I do. He said the cars are able to compensate to about14000 ft. Less O2 at higher altitude, less fuel added, less power. I certainly can tell the difference when running at 2000 ft as compared to 6000 ft and higher, ESPECIALLY on hot days! All has to do with the amount of O2 molecules in a cubic foot of air. I will have to check the manual, because as the altitude climbs, the octane of the gas is lower. I was running around in 6000 ft areas and 91 octane was the highest available, and 85 was the lowest. Where I live, 92 is the highest.In some lower altitude areas to the west (Columbia River basin) I find 93 Octane.

Riptide

I have a brenspeed 93 tune. Makes me wonder what the car was doing when I had it up over 10,000 feet last month.

bkid

Doug had to tweak my AFR to get it perfect,yet the mail order tune was very close to perfect.

jwog666

the maf sensor willgive the pcm a reading of thethe barometric pressure and the pcm will adjust accordingly

GidyupGo

Umm, Denver isn't high IMO. I go 10,200' everyday NOT running rich and getting 28 mpg. The car can handle it. I did have to rejet my 67 though.

abrush

We took one of our GT's up through the Rocky Mountain National park a couple months ago and it ran fine. Then again, don't ask me how our 86 Ford Coachman (carbureted)Class C motorhome did.