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« on: August 20, 2020, 09:09:24 pm »
GTRS Fiero "How is progress?"
New alternator installed and suspension mods done. 43 miles on the car but it's back on the ramps this week due to cooling issues. Based on the data logs, it builds temperature up to 230 then the fan kicks in and it drops to 200 and cycles between those two points. The cooling system has an electric water pump and 3 row aluminum radiator but I found a few areas for improvement.
1) The inlet hose to the waterpump was non reinforced silicone and was showing signs of collapsing under suction. Replaced with wire reinforced hose.
2) The overflow tank was undersized and there was a small air leak in the overflow tubing so I think I was introducing air into the system on cool down. Doubled the overflow tank and resized the tubing.
3) A bunch of articles I read on air flow made me think the radiator was not getting clean or consistent air flow as there was no ducting on the car whatsoever. Spent the last couple of days trimming fiberglass and fabricating a sealed duct for the radiator inlet at the leading edge of the car. Lot of fun avoiding the rather large metal cross member in front of the radiator. Also, enlarged the exhaust vents in the hood. I should be able to get tons of clean cold air through the radiator now and from what I've read proper ducting can lower temps by 25-35 degrees so I have my fingers crossed.
Waiting on a small fitting to finish the overflow tank then it's back to testing.
Scheduled for Road Atlanta on September 12 (I'm gonna miss the September meeting) and 13 if testing goes well.