Mike Canfield wrote: > > GM says DO NOT use any chips and such on the DUramax. They say it is tuned > as good as it gets and any mods will burn out the catalyst from too high of > EGT's.
Do all DM have cats? If not, when did it start? My buddy's 2001 7.3 PS is catless, but it's the old 235hp version. On EGT: I believe NO mods should be undertaken without EGT gauge. If you reflash the computer on a Ford with the minimum (I think it's +30hp) program from something like a Power Programmer, you will add very little fuel, most of the power increase will come from the timing change, and I would expect the EGT decrease from the timing to roughly match the EGT increase from the fuel. On mods in general: Don't do any mods on any engine unless you want to take financial responsibility if it throws a rod or holes a piston. That should be a very unlikely problem if you don't go overboard. Most of the busted Fords I've heard of were running extreme timing advance plus propane. That particular combo can put a rod through the block in a month or two. I never spent any time reading Duramax forums, and I never heard of a blown up Cummins when I was reading Dodge forums, so blown 7.3 Powerstrokes are all I know anything about. Mitch.
