Runaway Diesels, Diesel Supercar, and Turbo Matching - Top Diesel Tech Questions - TruckTrend Network
It’s a ’98½ Dodge Ram 2500 with a 5. 9L Cummins 24-valve and manual transmission. The truck is already equipped with a BorgWarner S300G turbo (57mm/64mm/0. 80 A/R), 4-inch Magnaflow exhaust, ATS Diesel Performance exhaust manifold, aftermarket air filter, 150hp Mach IV injectors, and a M. A. D. S. Smarty JR tune. Now the turbo shaft has some play, so I’m wondering which new turbo I should buy. It seems to me the S300G does not produce enough air for the 150hp injectors because there is a lot of black smoke when accelerating from less than 1,800 rpm with the higher Smarty programs. I want to take the next step up on the power ladder but don’t want to deal with slow spooling. Rosenheim, Germany Answer: It sounds to us like you have a common desire among diesel enthusiasts: less low-end smoke, better response, and more overall power. We’ll start with the smoke, since VP44 trucks like yours have a rotary pump that’s famous for fueling hard down low in the rpm range. First off, most of your low-end smoke issue is coming from the fact that you’re using tuning that adds a lot of fuel at low rpm to help spool the turbocharger (at higher levels), along with larger injectors, which also add fuel across the entire... Source: www.trucktrend.com
