TT3D: Closer To The Edge has become the UK's highest weekend box office documentary opener since Michael Moore's Fahrenheit 9/11, grossing £312,998 over its opening weekend.
Financed, produced and distributed by CinemaNX, the film follows key riders before and during TT 2010.
In particular it focuses on Guy Martin's preparation for the event as well as the drama of race week.
Other riders featured include Ian Hutchinson - who at TT 2010 became the first rider ever to win five races in a week - 15-times TT winner John McGuinness and Ramsey man Conor Cummins.
It appears word-of-mouth seems to be a big factor, and daily box office is steadily growing - Tuesday's box office was the highest daily figure since the start of the bank holiday weekend.
Supported by the UK Film Council, the exit polls from last week show a groundbreaking 96 per cent top level favourable rating for the film from audience members.
CinemaNX chairman Steve Christian said: "This is a really good result that we're all proud of at NX and Isle of Man Film.
"A smart distribution campaign carefully targeting both the core audience and a wider documentary-loving demographic is working.
"From our online Facebook and iPad/iPhone game which had over three million interactions and boosted early awareness, to careful guerrilla marketing to pretty much anyone who has ever had anything to do with a motorbike, we’ve managed to get the attention of cinemagoers and get them into cinemas on the hottest weekend of the year so far."
The film was screened on 70 screens across the UK during its opening week.
That number will almost double from tomorrow, bringing the total number of screens showing TT3D Closer to the Edge to 135.
The film opened on April 22 and had its Isle of Man premiere on Monday, April 18.
Also see: TT3D Closer to the Edge review