I currently have a 22' GR 86 and have done three track days with it. Falcon RT660, Ferodo DS 1.11 pads, camber and good fluids and she has been great even for 30 min sessions at a test and tune day with a race team at full pace. The 86 platform is really solid for a track car that is also a decent little street car.
I have the #1 spot at my dealer for a new GRC, and instead of a track car that is a decent street car I believe it will be a great street car that can also survive limited track use. The engineering behind the GR-Four awd system is that the clutch coupling is always slipping since the rear diff is 1% overdriven. I suspect going to the 30/70 split most of us would prefer for track use is done by clamping the clutches tighter which in turn generates even more heat?
In the GR Yaris the problem seems to vary in severity, I believe because of the variables with how hard the car is being driven, wide and sticky tires seem to make it worse, and certain track configurations may contribute.
Either way I believe the aftermarket will eventually come up with a solution. It seems an external cooler for coupling or differential is the logical choice but since they are not widely available for the GRY yet makes me think it isn't just as easy as slapping an air to oil cooler on the back (space limitations, need for pump, access to fill/drain holes to get access to fluid, etc).
I have the #1 spot at my dealer for a new GRC, and instead of a track car that is a decent street car I believe it will be a great street car that can also survive limited track use. The engineering behind the GR-Four awd system is that the clutch coupling is always slipping since the rear diff is 1% overdriven. I suspect going to the 30/70 split most of us would prefer for track use is done by clamping the clutches tighter which in turn generates even more heat?
In the GR Yaris the problem seems to vary in severity, I believe because of the variables with how hard the car is being driven, wide and sticky tires seem to make it worse, and certain track configurations may contribute.
Either way I believe the aftermarket will eventually come up with a solution. It seems an external cooler for coupling or differential is the logical choice but since they are not widely available for the GRY yet makes me think it isn't just as easy as slapping an air to oil cooler on the back (space limitations, need for pump, access to fill/drain holes to get access to fluid, etc).