The 370Z Weight Reduction Thread

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No measurements on the plastic removal, just common sense. Anything that gets more air exchanged out of the bay has to drop temps in there, same idea as hood vents. FWIW, I removed the engine cover, but left the upper stuff all in place. I like the little bit of shield it gives to the two corner compartments from heat (brake master cylinder in one, and I have my PCV catch can mounted in what used to be the battery area - if it stays a little cooler than the surrounding stuff it condenses better).

Re: undertray, it's not a huge benefit really, but it's worth it to me all the same. I like that it adds a bit of rigidity to the front of the car (not driving/suspension rigidity - plastic bumper/underside rigidity against pressure deformation at speed), as it solidly affixes the bottom edge of the front bumper and the edges of the corner underside plastics to the hard frame. The older Version 1 of it that I have, combined with my no-longer-available AMPerf baffled oil pan sticking out a bit more than stock, also adds up to more cooling (as the aluminum oil pan is pressed into contact with the giant aluminum undertray). Probably some fringe benefits in scrape/impact situations over the stock plastic too, but I don't scrape much anyways.