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PA Performance 03-04 Cobra 170amp Alternator
**Pulley Not Included** Please choose the correct pulley size according to the specific combination you run on your car.
**THE 170 AMP ALTERNATOR IS ONLY USED FOR THOSE RUNNING HIGH WATT AFTERMARKET STEREO ACCESSORIES**
This is a very popular replacement where slightly increased capacity is needed. This unit will increase the charging capacity at all RPM Ranges with NO modifications.
To calculate the alternator shaft speed, which should be no more than 16,000 RPM do the following:
Alternator pulley size (ie 2.5")
Crankshaft Pulley Size (ie 5")
Ratio is 2:1 (5 / 2.5 = 2)
Max engine Speed = 5800 RPM
Multiply Max RPM x Ratio (5800 x 2) = 11,600 shaft RPM Max
Idle RPM = 1000
Multiply Idle RPM x Ratio (1000 x 2) = 2000 shaft RPM @ Idle
An alternator needs 1800-2000 at idle to make power and will make maximum output at 6000 rpm, and will start to fail at 16,000 RPM.