Quote:
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Originally Posted by sp00ln
Quote:
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Originally Posted by Dean
Until they generate enough knock to cause the ECU to "learn", and reduce the multiplier instead of just retarding the timing as it does on single instances of knock.
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Do WRX's have knock sensors? Im sure they do, right? If they do, your car should NEVER run well with high amounts of knock, and in the case of knock, you'll timing will be retarded.
And yes, my car pulls so much harder at sea level than up here.... damnit. |
"My car's knocking is retarded."
The point is that if you drive a Subaru up at high altitude, the lack of O2 means the ECU learns to advance the timing/lean out the fuel to stay stoic. Then, if you take a leaned out car (aka a car who's advance multiplier is high) back down to sea level, the car will run lean, making extra power, until the knock sensor starts telling the ECU to back the timing off and add fuel.
Normally if a "mountain" car gets driven down to sea level, the ECU is adapting on the drive so the effect isn't that pronounced. But if you take it easy on the drive, or say, trailer the car down the hill, the 1st time you get on it at sea level the car will not only make more power than it does at altitude, it will also make more power than it will after the ECU re-learns sea level timing/fueling.
That's why Matt's STi put down over 230hp at the wheels in Sac, which is way more than the local STi's were putting down... he had the "high-altitude mod". The only problem is that after a while the ECU will correct itself and the car will slow down... plus, there's the chance the car could blow itself up down there if you got a bad tank of gas or something, and drove around like a maniac.