Blazin, if you didn't have to modify the torque axis mount, you didn't have a 10% underdrive.

TODAY'* update. I'm not happy. 103° outside, and the car runs at 220° with a 28000GVWR tranny cooler (trans was at 190°) in traffic at speeds below 45mph. With both fans on high. I had to turn the HEAT on full blast to get the temp to 200°. Keep in mind I have a 180° DRILLED thermostat and fresh coolant (6 mos old).

I think a lightweight 5% underdrive would be a much better option.

Willwren those pulleys were designed by me and made for me... I think I got a 10%. I have NEVER had a problem with my car running hot. My car stays right at 160-5* and never goes over 170*. 10% underdrive waterpump pulleys have ben used on 100'* of Series 2 and a handful of Series 1'* without a problem.

Well, dammit. Let'* pick this apart. My coolant system was entirely flushed 8 months ago (just checked the receipt), and flow tested at OEM specs. I don't use coolant, and I have a drilled 180° thermostat.

What do you run in 100° temps in slow city driving?

As a point of comparison, my 95 and 93 ran nearly identical temps prior to the JLAudioEcplipse pulley.

NOTE: The comment in this reply where I apparently say "I don't use coolant" was NOT my intended reply and was edited by someone after I posted. This is not a cool thing. No pun intended.

This is a serious topic that should not be edited for technical content.