As for the use of nitro - I try to make note of any power adder used - but sometimes they keep it for themselves.     You know secrets everywhere.. 

Welcome here.  

The guestbook is now being archived, it will be linked somewhere at the bottom of the forum main page (http://timeslip.hu/forum.php?lang=english )

As for captioning of horsepower, it would be just a guesswork.    Although I logged quite a few cars they do change constantly, so even the a 1-2 months old HP figure could be false.  And there is a number of cars I'm yet to measure.
Those captioned time and speed figures are the actual official timing results from their timeslips.

As for your results - with good tires a high 13 is quite possible, but a low 14 sec is definetely there for grasp.