Ok so 5 track days now.
The front bake master was bad so its being replaced. lack of front brakes working overheated the rear, despite the bias being ever more dialed to the front. Something was bad with allt he masters, this is the last of 3 (rear and clutch) to be replaced. Maybe they sat on the shelf at the coast in Sa too long.
Been playing with shock settings, still too much power oversteer on corner exits. Reducing rebound ameliorates this but now anythign close to liftoff, like feathering and it spins.
Solutions to try are softening rear compression to ameliorate power on oversteer, Or adding compression to front shocks as a means of stoppign the front pitchign down. Will see.
Alignment sorted and tires heating evenly across. The Hoosiers lasted 4.5 days and about 16 heat cycles. teh reas are gone, possibly all that power on oversteer did them in.
Working with different engine mounting bushings as too much motor movement.
Sorted clutch and shift linkage, its now smooth as butter.
Car is already significanbtly faster, but the front end grip is so tenacious that sorting the rear should enable way higher corner speeds and stability.
Compared to my lotus elise on slicks the GT40 seems more forgiving at the limit, maybe more nervous below the limit. I would say once sorted cornering limits are higher than the lotus. Turn in though is slower and the Gt40 requires a firm hand. Brakes are good, less initial bite than the lotus but more tolerance for repeated use from high speed.
Steering very comunicative.
Power is of course a completly different league. One needs to get used to 150 mph approaches where it was 120 before, etc.
The key for more speed is going to be carrying more though the bends, need to work on getting more rear stability for that.
One last note, its all tremedous fun, whereas other cars may be less challenging but are for some reason more scary. The Gt40 also feels very rugged, like it can be tracked all day every day without suffering. Driving at speed on track requires more intense concentration than other cars and is very physical, but is more fun.
Getting to the point where the car would run reliably and strongly has taken effort. Lots of things needed to be tightened after the first two days. The brake issue is a master cylinder issue, they were both bad, why is this.
The car itself is just so adjustable and sensitive to adjustments, it took a professional team approach to baseline what it was doing and then measure very change in terms of feedback and temps to get to a workable base point.
In other words no different to any other race car. But compared to a production car its not plug and play.
Still even now it will eat a turboed winged and slick shod cayman, especialy on the corners.
My guess is a Hoosier shod SPF is going to be hard to beat with pretty much any street based car on track, unless maybe its a 918.