| not sufficient "ram air" pressure at speed such that using bypass ducts becomes beneficial. There was no difference in coolant temperature on the test vehicle between the use of the non-ducted vs. ducted shroud. We are continuing to work on this and recently fitted the test vehicle with the Spal 3000CFM unit on a non-ducted shroud. It is working notably better than the Zirgo fans, keeping the coolant temps below 200F during 80MPH interstate cruise in 90+F ambient temps. The A/C system being used is adding a 10-15F penalty to the coolant temps. This is still using a standard EPROM upgrade program without the altered aux fan operation, but we will be testing the cooling system with adjusted aux fan parameters set to turn it on around 170F. That chip was supposed to be picked up this morning, but Roland (DAYTONAZ) was unable to make it by between getting a tire replaced and getting to work. We will be testing this in the next couple of days though. During in-town operation, the coolant temps are considerably lower with the Spal fan. It is the higher-RPM conditions (from the higher speed) with the A/C on in 90+F ambient temps that we want to get a little lower. This is still using an OEM water pump, underdrive pulley, and OEM thermostat, with Koyo radiator, side-mount intercoolers. There are still a few other ideas on the board that I want to test as well after the aux fan control change.
[ ashspecz.com ]
[ agpowers@bellsouth.net ] Enthusiasts soon understand each other. --W. Irving.
Are you an enthusiast? If you are out to describe the truth, leave elegance to the tailor.
Albert Einstein
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