sum800mit

Bought my first cummins a month ago. I hear a lot of talk of the transfer fuel pumps going bad and trucks being stranded. A friend of mine was complaining about a loss of mileage and power with his dodge. Took it to the diesel shop and they put a new transfer pump in it and an led light sensor that will glow when fuel pressure gets to low.

I put a centerforce dual friction clutch in mine, 4" exhaust from the turbo back, and then I put an Edge comp chip in it. The 4" down pipe came with a port for the pyro, so that is where I mounted the pyro. I've read on here that pre and post turbo egt's can vary by more than 300 degrees. So that being said, I pulled my camper up a grade Memorial weekend, and the egt's got up to 950 degrees at one point, add 350 degrees for post turbo difference, so I was up to let's say 1300 degrees. Is that too hot or not?

Also, I have a boost gauge and a fuel pressure gauge on the way. What kind of fuel pressure should I see with a fuel system that is operating properly? And how much boost could I expect to be running safely? Any help is appreciated. Thanks.

phox_mulder

A good lift pump will put out 14-15 psi at idle, and shouldn't go much below 10-12 at WOT (Wide Open Throttle).

Boost, well, with your comp you need to be right at the edge of the effenciency range of the stock turbo,
30-35psi if you have the wastegate blocked somehow, the Comp should have come with a "boost elbow",
a brass elbow that replaces the stock elbow.
You don't want to push more than 35 psi with the stock turbo,
at that point it starts heating the air and runs the risk of overspinning and imploding.

j-fox

1300 is the limit for continued use. Keep it at or below 1200. They guys who run short times, like drag racing and sled pulling don't even watch the pyro!! It offen exceeds 1600 degrees!!
What mods are done to get more boost? A elbow or a turn buckle? Something needs to be done or you will get too hot.

jrs_dodge_diesel

Those turbine blades have an extremely large amount of force on them then it flies apart. Pieces go everywhere and the damage it causes is not pretty.