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.
- Common on Ford DOHC Applications in 2003 & 2004 only and 3.8L applications from 2001 - 2004
- This unit is a direct replacement with NO modifications
- 90 amps at idle @ 950 rpm
- 170 amps maximum @ 3000 rpm
- The stock belt can be used on original equipment vehicles
- Actual Alternator Weight is 12.9 lbs
- All units are 100% NEW and come complete with internal voltage regulator.
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.
