Why would a truck smoke more at WOT with its fueling box turned down than it does turned up? ???

 

Timing? ???

 

Air flow ???

 

I recently added a Scotty 2 so airflow shouldn't be a problem because it sucks.....<br><br>Coooooooool air.<br><br>That one is for sheep boy of the north (Push_Rod) .

 

I've noticed that too. I have seen more smoke at 1x5 than 5x5. I thought it had something to do with how fast the truck is building boost at 5x5. The needle whips around in 5x5 building boost, which if I understand helps burn the extra fuel quicker meaning less smoke??

 

I noticed it at WOT and 30 psi.

 

Not many guesses.

 

I assume you didn't mess up levels and sublevels ;D <br>Do you run higher than 30psi with the box on 5 ?<br>Other than that I can only assume that you have more timing advance on the higher levels so the combustion is more complete. <br>Do you have smoke at part throttle on a high setting of the box while at boost? Then it could be that you have some injector dribble that will be cleared up under full fueling and full boost. <br><br>Just guessing based on the little information given..<br>AlpineRAM<br>