New to me 3500

[RipCord]

I purchased a 05 gmc 3500 6.6 lly( i believe)
i also purchased a superchip for it , now in performance mode it smokes like hell when i punch it,the chip is a huge difference, however it feels inconsistent, wasnt sure what to expect! the smoke bothers me what is it from??
Thanks fellas!!

[bigeasy]

What color smoke ???

[RipCord]

the smoke is black. the power is there but lots of smoke!

[bigeasy]

Over fueling bad..............
To much fuel can/will wash down the cylinders and cause all kinds of wierd things to happen till it melts down.

[More Power]

It's a somewhat negative side-effect of increasing fuel delivery without also increasing boost pressure. The stock Duramax runs with an excess of air, but add fuel beyond a certain point, and it'll smoke more. Lots more fuel - lots more smoke.

There are products that allow for more boost pressure in the LLY. The "Boost Stick" from www.kennedydiesel.com will help, as will custom programming.

Jim