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Originally Posted by AtomicLabMonkey
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Originally Posted by sperry
but I can prolly run 16 or 17psi safely to make up for the lower oxygen.
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Exactly... basically you shouldn't lose any power at all with your car at altitude vs. sea level since you can adjust the amount of boost... you can turn it up to compensate for the loss of air and be back to exactly the same air density/pressure entering the engine as you would have at sea level. Mine on the other hand... even if I advance the timing to try to get some power back it will still never have the same power output as sea level. |
Almost... I can compensate, but there's no way to increase the ppm of 02... I still have to run a higher pressure to get the same amount of oxygen, and higher pressure is harder on the motor.
Think of it this way... at sea level I have X amount of O2 at 15psi. At 4200 feet, I have .8X O2 at 15psi. If I go up to 17psi, now I'm back to X O2, but the motor's running under higher pressure. Basically same, power, more wear.
Also, I'm not sure how the ECU will react to 17psi all the time...
The big issue is knowing how much I can turn the boost up. Really, to get it right, I'd need an EGT gauge and a wide-band O2 sensor... the O2 sensor is like $500, and the EGT for my Defi gauges is another $200. Ugh.
So I'll prolly run it at 1.1bar (16psi) and take it easy when I'm down at sea level, until I know for sure I can go more...