Hmmm, they're better than my times-is your car modified? I could only get a 16.7 @ 84mph from mine at the 'Pod on a dry but cold day-saying that my front tyres are well on the way out. What timing gear was used?
I'm finding that 15.87 a bit unbelievable though, especially as my mate in a 2.0 Focus running in the region of 150bhp at the wheels (dyno proven, just can't remember the exact figure) was only doing 15.9's on the same day as me at the 'Pod.
I posted about my day at the Pod in a thread further down.