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@MB, in low range they control the heat rise beautifully on my installation. The simple solution is good radiator coverage and ample water for the right amount of time. The first two spray bars i installed failed miserably. The sprays were too fine and the volume too low. I ended up going to a local irrigation shop and buying brass spray heads at 1LPM rating and 180 deg spray pattern. I run 4 of them off a 4LPM diaphragm pump. They could be be described as a deluge nozzle, large water droplets. I don't know what the actual delivered flowrate is, and cannot tell if the pump is cycling or not when its on against any back pressure. I didn't bother trying at speed as my temps were totally under control.
Regards 'insufficient system', maybe a bit harsh for the poor old radiator. Its no doubt working a lot harder that Mr Nissan designed it for,(certainly the real estate area afforded for a radiator on the Nissan is a lot smaller than the US tanks) plus there would be a lot of motors and cooling systems out there that have been jinked around with and not running to factory speck anymore. My system does the job, costs under $100 and takes 4 hrs to fabricate and install. If you are running a vee belt drive i would guess the belts may not squeal like the shallow 8 rib, but this is a short lived interruption to my tranquility as the water quickly evaporates.
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