Absolute throttle @ 78%

Last night I connected my Uncles "AutoEnginuity" software to my car to just run some basic diagnostics. I took the car out for a while and played around with the software.

I found that at idle my throttle position is 16% and when I floor the car my throttle position is at 78%. Could someone please explain to me why my throttle position wouldn't be 100% when I floor it.

Is there something I can do to get it there or does it not really matter.

Take off your intake and have a friend floor it (with the car off) and check the butterfly flap in your throttle body. If it opens completely horizontal I wouldn't worry about it.

thank you, I will look into this.