Im running a 25 row oil cooler with thermostatic plate. I hit 120c on track in summer here in australia. Sits around 115c when ambient temp is 14 to 18c in winter on track. Brake fluid and clutch fluid and lines are a must to function properly in the heat. Dont forget about fuel starve issues of the 370z. Keep your tank full or check out CJ motorsports road race pump for a permanent fix. Also eventually your going to find the stock diff pretty useless on track as the viscous lsd overheats and starts behaving like a open diff pretty quick. Haha its never ending really. We are a twisted bunch of humans us track folk.
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