Hi pal, even a 6.5 turn motor will be way too fast for macctrack its only a small track in relation to Bury Metro, im a regular there and i run a zx-5 i still run the standard RTR 20 turn motor!! i think the most you would need is a 10 turn at Macc even that would be very quick for the tight layout!!
Your 6.5 will be interesting to see.......bring some spare wishbones and braces....you may be needing them...
See you on Friday hopefully pal.
Paul...