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3" Alternator Pulley Toyota Supra 2JZ 1JZ
3" Alternator Pulley Toyota Supra 2JZ 1JZ


 
Our Price: $85.00


Availability: Usually Ships in 3 to 5 Business Days
Product Code: BP-ALT-3.125PULLEY
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Description
 

1JZ & 2JZ 6 Rib 25% Underdrive Alternator Pulley

Spinning your alternator passed the factory limit often leads to failure. Extend your alternator’s life by reducing its maximum RPM while maintaining sufficient charge at idle.

Our underdrive alternator pulley will help keep the rpms within a more reasonable range when spinning past the factory limiter. Our pulleys are CNC machined from billet 6061 aluminum and are hard black anodized for a durable finish.


NOTE: If using Aftermarket Crank Damper (ATI 6.187" , Fluidamper 6" or TitanV2 6")
Please use our 3" or 3.5" for the ATI 6.187" Damper to correct Alternator speed.
Please use our 2.9" for the Fluidamper 6" and Titan V2 6" Damper to correct Alternator speed for High RPM / HP.
All alternators come with 2.4" pulley and is used with 8000RPM or less


Fitment Guide:

MakeModelEngine SizeYear
LexusGS3003.0L1993 - 1997
LexusGS4004.0L1998 - 2000
LexusSC3003.0L1992 - 2000
LexusSC4004.0L1995 - 2000
ToyotaSupra3.0L1993 - 1998


How to Determine Ratio and Rotor Speed

The alternator rotor RPM is not necessarily the same as engine RPM. To calculate the actual alternator RPM, determine the ratio between the two pulley diameters.

Ratio = Crankshaft Pulley Diameter/ Alternator Pulley Diameter

Now that we know the ratio, we can now determine the rotor speed:

Rotor RPM = Pulley Ratio x Engine Speed
(example; 2.1 x 870 = 1827 Rotor RPM)

Tech Tip
Generally, For drag racing, the alternator should be overdriven by a ratio of 1.75:1 or more. This will allow charging on the return slip and in staging. For street use, we recommend 3:1.

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