The model's fatally flawed - It's not fast enough......
Timed over a 1.8 metre straight at max speed on a number of runs, time taken was averaged out at 2.25 seconds(note, variation from that average was no more than 0.04 seconds -/+). So...
1.8 x 76 = 136.8 metres scale distance. 136.8 divided by 2.25 gives a speed of 60.8 metres per second. 60.8 x 3600 seconds gives a speed of 218,880 metres per hour, which is obviously 218.88 kms per hour. 218.88 divided by 1.61 to give the mph equivalent gives a figure of 135.95 mph. Must be the first time a model has been slower than the prototype....
However, there IS a solution: if you pretend it's 1/87 scale then the speed works out at 155.63 mph!
Is yours faster than mine, mister???
Cheers! (must take my anorak off when I'm indoors..)