hey! when i drive my fc and shift, when i get back on the gas it sends out a decently large amount of whitish gray smoke out the back that i can see in my rearview. it only smokes like that when i shift and then acelerate. it seems to do it a little more at higher rpms but im not sure becose i am in the car. i have a s5 turbo II motor and am running premix. please help me to know whats wrong . thanks!

 

Bad oil control rings or bad oil seals on the turbo.

 

Most likely the turbo is going out as this is commonly the problem when there is smoke on deceleration.

A quick test for the oil control rings is to rev the engine 5000rpm (or so) and hold it there for a few seconds. If the car starts smoking then this is a good indicator your engine needs rebuilding.

You could also have an issue with your tuning if you have anything that is tunable or you could be using too much premix...