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While the coolant system couldn’t have performed any better (thanks Koyo!), the oil system was not acceptable. Even though the air temp was only in the mid-60s; I still ran into oil viscosity and pressure issues using the standard weight 10w-30. The oil temperature wasn’t terribly bad at 121C (though measured after the factory oil cooler using the sandwich adapter from Ark Design, so the oil is hotter in the pan), but as I was pulling off track and popped the car into neutral, the alarm went off on the MFDII (gotta love the warning system!). In everyday driving with the oil fully warmed up to 90C-95C, the oil pressure is typically around 1.5 bar as measured at the sandwich adapter. I set the alarm to sound when the pressure dropped below 1.3 bar. So even after a cool down lap and the oil temp back below 110C, the oil pressure was only around 1.2 bar at idle. For all you S2000 guys with no additional oil cooling, I wouldn’t even think of running 10w-30 again for a track day.
The StopTech brakes, like the Koyo radiator, had no issues at all. Last time at the track, I used track pads up front with the StopTech street pads on the rear which shifted the brake bias forward and reduced the work load on the rears. This time, I ran the StopTech street pads front and rear. This had the benefit of rebalancing the brake bias and resulted in more neutral braking.
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StopTech pad wear on the fronts after one track day and about 10k miles of daily driving. There’s still a ton of meat on them.
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The only thing really worth noting is that the Stop Tech BBK with ghetto ducting on front ran much cooler than the rear brakes using the good ole hand pyrometer. I might come up with something to cool the rears one of these days.
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Rear StopTech pad wear with two track days and 10k miles. There’s still a lot of pad remaining, but they do appear to be wearing faster than the fronts.
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