The final verdict: The radiator cap and the reservoir cap were reversed. Looks like when the shop installed my oil cooler they flipped the caps backwards. Caps look very similar, even took Nissan some time to figure it out. What happened was, the added pressure in the coolant lines from a track event caused the pressure to push fluid out of the overflow valved on the radiator instead of through the top of the reservoir. All fixed. Cars runs smooth and strong.
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308 rwhp | 252 rwtq | Fast Intentions CBE 18" Res | Stillen Gen 3 CAI | EcuTek Tune | Stoptech Slotted Rotors and Sport Pads | KW V3 Coilovers | SPL Upper Control Arms & Lower Rear Arms | Seibon CF TS Hood | Vossen CVT | SPC Toe bolts
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