Cummins Cooling Mods

KEEPING EGT AND COOLANT TEMPS IN CHECK IN A MODIFIED 6.7L CUMMINS

- Mike Mcglothlin

With 800 lb-ft of torque or more on tap and a stack of massive heat exchangers onboard, it’s no wonder modern diesels perform so well straight from the dealership. But what happens after we’ve doubled the factory horsepower rating? Are we still safe to tow the same 12-to-15 tons we did when the truck was bone stock? Believe it or not, the answer is both yes and no. While the factory intercooler can suffice, with hundreds more ponies in the mix, it usually means we’re watching gauges more than we’re watching the road or that we’re force