Jack Owen

After boost leak repairs i am getting 25lbs of boost. Had the turbo off when I did the big exhaust and all seemed well.

stock turbo

Just got off the phone with Quadzilla and was told that a tuner wouldn't help my EGTs? WTF?

I zip tied my boost gauge next to my pyrometer so I could watch them both and not die ...lol

Hmmmmmm....some evening testing. I secured my boost gauge next to my pyrometer and made some hard passes, no trailer. My egts hit 1100 before my boost gauge even moved. At 1400 I only had 10 psi. Could my turbo be crapping out???

Can't thank everyone enough for the help. Let me review just a bit. This truck always ran EGTs on the high side when towing. Even with a new VP44 (thanks DAP) they still ran high. Without a trailer I could get then pretty high if I drove like a maniac. When I put the +50 injectors in is when I started to notice the smoke. I noticed the EGTs climbing the first time I pulled the trailer. Obviously I induced a couple of boost leaks when I put the big exhaust on. Before I fixed the boost leaks I could hit 1500 while driving very, very carefully. After boost leak fix the smoke is much less and I can hear the turbo spool faster. Without a trailer EGTs 900 or so 75mph. Pulling a trailer I am now seeing 1350, steady cruise 70 mph. It is MUCH better after the boost fix. I am beginning to think that time and mileage is beginning to take it's toll. My home brew fuel is known to leave more carbon deposits than regular fuel. I'm afraid that tuning the problem away doesn't fix the problem. I am going to try water injection to see what happens. The boost leak fix has made a big difference and I thank you guys for the advice.

I think my next decision os going to be water injection or a tuner? Thoughts?

Nope, cruise

Well...found 2 boost leaks. Clamp on the turbo outlet and broken bolt on the intake manifolc. Spools faster, less smoke, but EGTs just a little bit better. 1350, loaded, 75mph. Next ideas? Thanks!

I have some pvc in the lathe right now to make plugs. Thanks for all the ideas.

MAP appears fine. My scanner reads MAP in inches of HG. 1 inch of HG = .491 PSI. my MAP reads 29 static which is 14.2 PSI (atmospheric pressure). 75 inches of HG = 38.825 PSI. Subtract 14.2 and we have 22.6.... darn close to what my boost gauge reads. SOOOOOOO.... certainly appears that my boost is appropriate. Pump or injectors???

MAP reading is 29 at idle and as load is applied

Yep. Real time. What are the units of measurement for the MAP?

That my friend seems to be the question. How do i know?

Alright! Got some real time data. Boost gauge attached. Rolled into it as hard as I dared. Boost was 24, EGT was 1500, and MAP from code scanner was 72!

I will check thr EGT wires ect... Thanks

Fuel pressure is never less that 20. No trailer, 75 mph 900 -1000. Loaded, it well peg a 1600 gauge but I can usually keep it around 1200 if I drive VERY carefully. No difference between Diesel and home brew. 10 MPG loaded. 18 - 20 unloaded. Water temps never exceed 190. I know, the home brew scares everyone BUT, it's close to 20,000 gallons of diesel that I have not purchased. Thanks for the ideas.

Yep, stock turbo. I was reading the MAP from a code reader under various loads. I thank the actual boost is 15 below MAP. I cleaned the waste gate but that didn't seem to change anything. I did not check to see if the accuator worked.

Hahaha! The fuel has been on long experiment. I always run at least 80% WVO. I cut it in the winter depending on temp. My VP has 230,000. The smoke didn't bother me too much but when I started pulling the race trailer this spring I noticed the EGTs climbing fast. I wonder if the turbo is worn out IE wont spool fast enough?

put new DAP injectors in last summer. Have been fighting High EGTs and black smoke since. Didn't think +50 injectors would cause this much trouble. MAP 48 when pulling hard. Is there ANYTHING in the VP44 that can make it overfuel with no codes?