I recently did the Grand Valley 300KM in the '86 RUF BTR, and decided to try to shop for settings, came upon the Blackbird.
Wound up trying the Blackbird's suspension, wings, brakes, and limited-slip during practice runs, and then tried a 'mock' race, lapping right up till the first pitstop before cancelling the race. I like doing mocks sometimes, just to see if it's possible to use a certain car.
Great stuff as usual, but it just didn't feel right for this situation (an endurance at GV up against JGTCs and DTMs), but don't take this as a huge criticism. The car felt fine if I drove it casually, but since I was limiting power to about 436, I'd need to be pushing BTR to the edge of disaster often.
Had alot of trouble controlling this Blackbird (actually, it's really only a half-Blackbird, since the tranny was still stock, and power not official MFT) but I think it's partially because I was using super-hard R1s, while the Blackbird's set-up called for R3s. I also notice the caption, which says basically that this car WILL bite your head off if mistreated, and I was needing something a little more compliant.
Turn two (first hairpin) was a disaster! Couldn't control the Blackbird worth a dang here!
The blackbird was also set a bit too low for my style of driving, but only because I sometimes wind up going on GV's concrete pads and bouncing over an occasional rumble strip.
so yea, I wound up messing with the car till it did what I wanted, and wasn't even 10% Blackbird for this situation.
I even changed the wing settings from 30/30 to 25/30, simply because I needed the front-end to not be so grabby under braking into that first hairpin.
Does that qualify for a review? If so, how about making an '86 BTR that'll work for Grand Valley on super-hard tires?
Just curious, I wanna see what you come up with so we can compare notes.
Hint: I finally learned I'd need to brake TWICE into that first hairpin, even with my settings. My typical habit (with other autos) is to brake only once into this area, somewhere before (or perhaps at) 100 M. With the BTR, I'd need to brake twice....once where the shadow is (there's a shadow that runs across the entire track just before that first left-kink), and once somewhere between 100 and 50 KM. If I tried braking only once, the BTR would get way-squirrely. Even if I didn't spin, the damage control needed to contain the beast would wind up costing too much time. It was simply safer to brake twice.
That is my aim.
Weird, I know..), and has racing tranny to squeeze all that power out while maintaining traction. If you wish to beta-test it before I publish it some day, let me know.
I wasn't thinking!!! 
