If you are a gaming on the iPhone, iPod Touch or iPad and play Gran Turismo, wouldn’t it be great to be able to take advantage of all the customisable components in the racing game series? Well if you grab the Gran Turismo Tuning Guide app you can.

The Gran Turismo Tuning Guide app for iOS 4.0 and above devices delivers explanations on every tunable component including design, their purpose, how customising them will affect your vehicle, and the guide lays it all out for you.

In the Gran Turismo Guide app there is a theory section which talks about driving and tuning techniques along with step by step tuning instructions, a ride compliance tuning guide which delivers an explanation of shocks and springs, a spring rate calculator for optimised spring rate, and an ever expanding Q&A section which shows what questions Gran Turismo fans have submitted and you can submit your own.

So if you really want to be in the know when it comes to playing Gran Turismo, you need to download the Gran Turismo Guide which will cost you $2.99 from iTunes.