calibrate questions

[tempuras]

my speed is off rite now and i plan to calibrate it,
my rpm needle is never taken off so it's accurate and i test it with my friend driving next to me and found out my speed is off by 4mph. So the correct setting for my car at 5th gear @ 3000 rpm speed is 55mph. At 6th gear @3000rpm, the speed is 69-70mph.
I read a while ago, people say at 6th@3000 speed should calibrate to 65mph. i was wondering which one is correct? mine should be accurate becuase my rpm needle is never taken off and my friend has a new car. I have GT-S btw, thanks

[Pinoyspd17]

sup..

i was the one who said the "65mph at 3000rpms in 6th gear"....its right....

or according to an s-afc: "65mph at 2980rpms in 6th"

thanx

[tempuras]

does this mean my friend's speed needle is wrong? :confused:

[Pinoyspd17]

probably...those numbers are based on s-afc readings...just as long as yor a 6spd gts....