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Jake Raby · 03-08-2013, 08:25 PM

I have found that cooling is better at higher speeds with the under driven pulleys. I've only been testing different diameters of them for over 6 years now.

I have driven a car 28,000 miles in one year with a 4" UDP on the street and track in winter and summer and had no adverse effects, even with every accessory on in traffic on a July day with a 95F ambient temp.

Results always vary.

03-08-2013, 08:25 PM	#8
Jake Raby Engine Surgeon Join Date: Aug 2008 Location: Cleveland GA USA Posts: 2,425	I have found that cooling is better at higher speeds with the under driven pulleys. I've only been testing different diameters of them for over 6 years now. I have driven a car 28,000 miles in one year with a 4" UDP on the street and track in winter and summer and had no adverse effects, even with every accessory on in traffic on a July day with a 95F ambient temp. Results always vary. __________________ Jake Raby/www.flat6innovations.com IMS Solution/ Faultless Tool Inventor US Patent 8,992,089 & US Patent 9,416,697 Developer of The IMS Retrofit Procedure- M96/ M97 Specialist Last edited by Jake Raby; 03-08-2013 at 08:27 PM.