deurges05

I am planning on buying one of the kits that come with a CAI and a tune, but I'm wondering if the tune will work for me. Should the tune need to be different due to the location or altitude of where I live? I live in Mexico, and the place where I'm at is 5,141ft above sea level.

Is there a way to know if the factory tune is the same as in the cars sold in the USA?

38special

Air being thinner at higher altitude should result in less horsepower. I'm sure some motor head on this thread can pull a formula out of somewhere and let you know what the decrease is.

deurges05

Yeah, I believe that because there is less oxygen here, maybe the tune that works in most places of the U.S. won't work here.

I want to know for sure, before ordering a kit, and getting my engine killed because the air fuel ratio is off, or something like that.

RRRoamer

Worse case is you will be running rich. The ECU should compensate for this somewhat with the MAF sensor. Normally, you have to lean engines out as altitude increases. Fuel injected engines do a decent job of on this automatically, but carborated engines have to be jetted down as altitude goes up.

deurges05

But would that be a problem, or is it easily fixable? Can the Diablosport Predator fix something like this?

I know running lean might damage the engine, but what about running rich? And if the car is already tuned, does it still compensate?

rhoover2

I was told by the ppl that did my tune that the ECU can compensate for a 15% difference.

deurges05

Is there any formula to calculate how much oxygen is lost at what altitude, to somehow compare it to somewhere that is at sea level? or is there someone else here on this boards that might live at the same altitude that I am, and has already tried one of this tunes?