For car performance (ie driver development), you need a GPS/accelerometer based system that will log speeds/acceleration ('g') - these show when/how much you are accelerating/braking, and can also be used to show your lines through corners on a track map. These come in many forms, some in a 'digital dash' form (see Magpie's many posts on his Racepak system, which come in logging form like mine or display-only like his), some phone-based, some as a separate 'black box'. Some are cheap and nasty, some are horrendously expensive (to us, maybe not the pros). Ideally they not only provide the data not supplied by your ECU, but also integrate the ECU data so that you have a single source to interrogate/display ALL data. One way or another, you pull the data from the recorder (dash, phone, black box, etc) and use your computer and specialised software to create the graphs, maps etc.
Data can be overwhelming to the beginner - there is so much to look at, to understand, to play with. It is therefore important to know what you want to prioritise - in your case car speed (driver going faster).
I suggest a new thread along the lines of 'thinking about data to help me improve my driving, what system best for me' to get some input/advice on the options, costs etc.
Pro tip 1: Pick a system used by somebody you can easily consult with to help you along the learning curve.
Pro tip 2: Pick a system that integrates the ECU data - you have too much invested in that engine not to be monitoring what is happening inside it. It may not be your priority right now, but it will be good insurance.
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