May 2015 Top Diesel Tech Questions - TruckTrend Magazine
When starting out, there’s a scary amount of lag before the truck gets going, which isn’t good if another vehicle is coming. Trucks equipped with turbodiesel engines usually experience a decent amount of turbo lag—even those with the newer variable-geometry turbos. While driving newer rigs, we often found ourselves needing to use the brake-boost technique (build turbo boost pressure while holding the truck still with the brakes) in order to make quick turns without getting run over by Los Angeles traffic. When you see a diesel that blows out a puff of black smoke when rolling on the throttle, often that extra fuel is added to increase the rate the turbo comes to life and makes boost. In factory form, LB7 Duramax-powered GMs have very little fuel off idle, and a good bit of rail pressure and duration can be added to spool the turbo quicker yet not produce much black smoke. Any type of basic tuner such as those available from Edge, Banks, or PPE can add enough fuel and timing to make the truck responsive, even if you just drive around on a “Tow” tune. It’s a tuning tool that allows an end user to access the engine’s computer via a laptop and change parameters like fueling duration, timing, rail pressure, and other engine functions that affect the rate at which a turbo spools up. These custom... Source: www.trucktrend.com
