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Can you send a link to where they recommend the 1cm gap? I've mounted spals on my street cars flush, there's SPAL hardware that has zip-tie like prongs that go through the fins of the radiator to mount the fan flush, and all of the racecars i've seen have the fans mounted flush. IMO that gap greatly affects the cooling ability of the fan which could explain your issues since air takes the path of least resistance and will be sucked in from that gap rather than from through the core of the rad.The FXMD NSX has 1 (16"?) fan and it keeps it plenty cool at idle after coming in hot on track.You mentioned the radiator end tanks a few times. What's the issue with the top & bottom end tank configuration like a stock NSX? I believe the hot water goes in the top and out of the bottom like most production cars.
Can you send a link to where they recommend the 1cm gap? I've mounted spals on my street cars flush, there's SPAL hardware that has zip-tie like prongs that go through the fins of the radiator to mount the fan flush, and all of the racecars i've seen have the fans mounted flush. IMO that gap greatly affects the cooling ability of the fan which could explain your issues since air takes the path of least resistance and will be sucked in from that gap rather than from through the core of the rad.
The FXMD NSX has 1 (16"?) fan and it keeps it plenty cool at idle after coming in hot on track.
You mentioned the radiator end tanks a few times. What's the issue with the top & bottom end tank configuration like a stock NSX? I believe the hot water goes in the top and out of the bottom like most production cars.
