Engine/Transmission (1998.5 - 2002) Low Boost/EGTs/Power... what's up?

[Nate]

Well I was pulling a Suburban a few days ago to go up the the mud drags. Real bad headwind.



I had my truck WOT just about the whole way (60miles). What I don't understand is I was only able to hit about 24lbs of boost, EGTs were at most 1100*. For whatever reason, torque convertor was locked, trans in O/D as well... I didn't even realize it was on the floor cause it never came out of O/D.



With the Superchip programmer, I could hit 30lbs of boost. Now running the Smarty, which was on #9, also have a boost elbow... and it's lower? Does that make sense?



I was thinking maybe a boost leak, but my EGTs should have been getting HOT! I searched on here how to make a leak detector, but the couple writeups I saw didn't make sense to me. Does anyone have pics on how to make/use a leak dectector?



Fuel pressure is fine. I don't have a guage, but a dummy light that kicks on at 5psi, and it hasn't kicked on. The fuel pump is on the frame rail.



Does this whole situation sound right?

 

[Cummins724]

I don't have a camera to get pics, but I'll try to explain a hillbilly leak detector setup that I use. Get a 4" rubber fernco fitting from lowes etc. This fitting is used on 4" sewage pipes to join them together [coupler with 2 hose clamps]. Get a 4" screw in style schedule 40 cleanout cap [threaded type] & install it in the end of the fernco & clamp it down real tight & double clamp it. Find a air fitting [male] like one that you would use to hook to a compressor line for pneumatic tools. Drill a hole in the end of the cleanout cap & screw in the air fitting [no tap needed. . It will make its own threads] Then put the fernco onto the turbo [air intake side] & double clamp it tight. Set air compressor regulator to 5-8 psi. Attach the air line to the fitting & check for leaks. I know that it sounds like a idiotic setup, but it works great for me & it is cheap.

 

[Nate]

Ok, well that makes sense! Thanks!