Difficult to tell mate.
There are soooo many different factors that could affect your time..
- How your launches went?
- How dry was the strip?
- Was there a head/tail wind?
- How much fuel did you have on board?
- Was Traction Control on or off?
etc...
14.7 does sound quick though. I managed 15.0 and a terminal of 94mph in my ZS180 with exhaust mods a couple of years ago. I doubt any possible boost leak is hampering you that much if you are posting times like that.
Biggest factor on the strip at Pod is the DRIVER!
J