Dear Friends,

We all love our cars & like to improve our rides (if u're not, u won't come to ZTH, right?)

I would like to know how do u measure improvement of torque & hp without putting ur car to a dyno machine..?

Especially after u bolt on some simple performance part..

Let me share how i do it 1st.. i'm not a pro.. so, my method is not exactly correct..


IDLE SPEED
the 1st thing i would do is take note what rpm my engine idle before and after i bolt on the...