2008 RAM 6.7L Cummins Gains 23 MPG & Instant Power with Banks Monster-Ram
Bryan Payne initially set out to eliminate the dreaded heater grid problem from destroying his 2008 RAM 2500 6.7L Cummins, but the upgrade delivered far more than just peace of mind. “It upped my fuel mileage, and as soon as you touch the pedal, the power is right there. I don’t know how much horsepower it increased, but there’s more there. The truck is what you’d call mildly built, really, with 50-over injectors, some engine work, a built-up transmission, a tune, and a bigger turbo. The Monster-Ram just took all that and boosted it!”
“Not only does the power come down low, but before, I was averaging about 20 miles per gallon. Now I’m at 23. I’m not wasting fuel by dumping it out the exhaust pipe. With the additional air, I’m burning it all. The install was easy and straightforward. This truck has 240,000 miles, runs like an ox, is a daily driver, and I tow with it. I can sleep a little easier now knowing I’m not going to have a catastrophic engine failure. The Monster-Ram is totally worth it!”
Shop Monster-Ram® Intake and Killer Grid Heater Upgrade →
How the Monster-Ram Optimizes Air-Fuel Ratio on Modified 6.7L Cummins Builds
When heavy-duty diesels run 50-over injectors and larger turbochargers, they demand significantly greater air mass to burn that extra fuel. The pinched factory intake horn restricts airflow to just 38.6 lbs/min, leaving heavily fueled cylinders starved for oxygen. Without sufficient air mass, excess diesel dumps unburned out the exhaust as black smoke while spiking exhaust gas temperatures.
The Banks Monster-Ram intake elbow increases mass airflow by 88.3 percent, delivering 72.7 lbs/min of dense charge air. Replacing the restrictive factory heater with a high-flow billet plate routes incoming air directly into the cylinder head. This complete air-fuel combustion explains Bryan’s impressive 3 MPG gain and instant low-end throttle response. Most importantly, eliminating the factory grid heater bolt protects his 240,000-mile engine from fatal stud ingestion.
Related RAM 6.7L Cummins Monster-Ram Articles
- Explore 50-state legal airflow in the 2007-2012 Monster-Ram CARB emissions guide for working Cummins trucks.
- Review mass airflow gains in this Monster-Ram Cummins upgrade review highlighting throttle response and spool.
Discover why mass airflow beats CFM in this RAM 6.7L Cummins airflow science breakdown by Gale Banks.- Compare grid heater delete solutions in this FASS Motorsports Monster-Ram installation preventing engine ingestion failure.