kzspree320 wrote:
There are tuners designed to be used with DPF intact and tuners designed to work only with the DPF removed and generally say something like "for off highway race use only". Any removal of the DPF system could pose a big problem if you have emissions testing in your area. I spend a good bit of time on the Dodge Cummins Diesel forum. It looks to me like a high percentage of the folks reporting big problems are driving trucks with tuners. I realize many people that tune their trucks drive them hard. I know people that have tuned their trucks with no problems for many miles (no emissions testing here), but I think the best chance for getting the truck to go high miles with minimal issues is keeping it stock. Good luck. Keith
I'm one of the folks who had problems after installing a tuner. I put a Hypermax Econ tuner on my truck. On the plus side I got more power and better mileage.
The down side is that the increased cylinder pressures ended up blowing a head gasket and costing me $8000 in repairs. I have installed aftermarket head studs and reverted back to a safer tune.
It was an expensive lesson.
When manufacturers use the same engine in commercial vehicles that they do in pickups, they detune the commercial version for longevity and reliability. There's a lot of logic in this and you should consider it before you mess with your tuning.
Last year the Federal Government started cracking down on the tuner manufacturers for allowing consumers to bypass emission controls. One tuner manufacturer was sued by the EPA and they have since removed the option to bypass the emissions.