This was already in the car when I got it(used car). Just curious about the accuracy of the 02 and a/f readings. Do you apexi TT owners rely on them for tuning?

Its a narrow band reading. Therefore not reliable, Take the readings with a grain of salt.

Its narrowband, I wouldn't really use it for tuning imho.

I wouldnt use it for tuning. It'll give you stoich acurately though

Have one and my friend has one too...we tested how accurate it is and everyone would be pretty suprised. We checked the apex aginst an innovative wideband and it was about 2 points +- off.. so its off but not by much

What about turbo cool down timer settings? What do you have yours set at? I have mine at 30 secs.

I use the 1:00 setting. I didn't hook up the A/F I got a wideband. But like said above it will give you an idea of where you stand. If it says lean then you are lean!

That depends on how hard you drove how soon to turning the car off... usually 30sec to a min is plenty if not overkill, if it was so important it would have one from

It comes with auto time detecting?
I set on 20 and let it read automatically(on high)

No, you just know to let it idle for a few minutes if you just got done doing a 0-250-0 mph run and then immediately park Vs letting it idle for 0-30 seconds after an easy (no boost) cruise to the gas station