VG30 Race Damper is built around ATI's large diameter 6.325" inertia ring to control high-RPM harmonics (a larger/heavier inertia ring will control harmonics better at higher RPMs than a lighter one will).

• 8% overdriven AC and H2O/Alt pulleys
• 6% overdriven PS pulley
• Rated for 1000 HP engines
• Weighs 7.24 lbs (stock weighs 13.4 lbs)
• Aluminum outer/inner shell and pulleys
• Removable crankshaft hub
• Laser engraved 360° timing marks
• SFI 18.1 approved
• Black anodized finish
• Built in the USA

A note about fitment: This pulley's design was based off the 90-93 TT crank pulley, meaning it was designed to be used in conjunction with the 90-93 power steering pump. We've observed that running it alongside a 94+ TT, or NA style power steering pump can cause slight belt misalignment, which can lead to the belt flying off at high RPM. Here are some tips we've learned over the years:

• A belt being too tight will increase the likelihood of this happening, it tends to make it "roll over" and jump off
• It can be partially mitigated by running a 4-rib pulley (like UR or AMS) on the pump, but running a 3-rib belt aligned to the front of the PS pulley but the REAR of the crank pulley. It's important to note that this only applies to aftermarket 4-rib power steering pulleys for the NA pump; the 90-93 TT pulley does NOT fit the NA pump correctly, and would cause significantly worse misalignment.
• The pump can be moved forward slightly by grinding the inside of the pump bracket, and shimming it forward with a thick washer. We have also had reports back that slightly shimming the power steering pulley itself (with a thin washer) can achieve the same correction.

We've brought the issue to ATI's attention, but because it only seems to be limited to certain combinations of setups, it has remained unchanged. Please note that this is just the way they are, and we cannot accept returns for these once they are installed.