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I've been crazy busy at work the past couple weeks. I'd like to try that air cleaner housing if you still have it. Ran 100 gallons of fuel through with no issues so far.

The stock air filter and the Wix 46664 are not enough cfm. Both are bringing the air filter restriction gauge up to the red line with a new filter. So next I'll be looking for a new air cleaner and installing a fuel filter restriction gauge. My truck seems to run better on the right tank than...

Pulled my M348 yesterday. Still about 17 psi boost. Hit 1000° pre turbo on a long steep hill before dropping a gear Fuel pressure peaked about 185 psi I was at 225 psi before I had the injectors flowed. I did not adjust the pt pump. I feel more comfortable with 185 than 225. I recommend...

Hit 17 psi boost @2150 rpm Should make it about 335 hp

I sent my injectors out and had them flowed 30cc over stock. Antrim Diesel in Greencastle Pa did them. Feels like it has more power. I feel like I'm not holding the pedal down as far to cruise. Pyrometer stayed about the same. 900° max, but was only bobtail. I'll get pt pump pressure and boost...

Definitely an improvement. Seeing 225 psi, I may turn the screw down a bit. The pressure comes up faster. I didn't really notice more boost, still around 13 max. Maybe 800° exhaust pre turbo. I was able to accelerate up hills that previously could barely hold my speed on. I have a #12 button...

Just put a #20 button in. Had a #37. #27 should have been stock. Haven't driven it yet. I'll get pressure, egt and boost #'s in the morning

I got a used manifold but this is the same one but new. http://www.agkits.com/cummins-nt855-old-style-small-cam-big-cam-i-ii-iii-exhaust-manifold-3801322.aspx

I installed a block heater too. But sometimes I stay at work overnight and it makes it easier to start when it's 10° outside.

You 939 guys have a lot more room under the hood. I used the factory intake manifold. I wanted to keep my cold start. Are you planning on bumping the pressure or changing the button? I have a couple of buttons to try out but haven't had a chance to do it. I hope to get the stack on this week...

http://www.steelsoldiers.com/showthread.php?95070-NH-250-lifter-housing-shims Changing the timing is not required. I think it may make better power at a lower egt and make the engine last longer though.

I just got the turbo install finished. Took it for a ride. Still 200 psi at pt pump and about 12 psi boost. EGT's stay a lot colder. And I kept it in 5th on a hill I normally would have dropped to fourth on. I replied in an old thread about retarding the timing a degree or two. Upping the...

I wasn't planning on putting the muffler back after the turbo install. The turbo acts as a muffler and really shouldn't make it any louder. You would probably be better off finding an air filter assembly off a big truck in a junk yard. The high flow replacement filter for our stock housing...

Any updates? I ordered a couple of buttons to experiment with, should be here Monday. I hope to get started on my turbo install soon too. I pulled a trailer last weekend with my wife's trailblazer on it. On a hill a few miles long my exhaust temp got up to 1100° I'm hoping to see if changing...

102635 is a 0 button

https://quickserve.cummins.com/qs2/pubsys2/xml/en/tsb/2012/tsb120174.html?q=+category:service%20language:en^2TSB120174 Pt Fuel pump calibration parts http://transportation.centennialcollege.ca/oduffy/fuels/level3fuels/Cummins%20pt%20Systems.pdf good read

patracy posted this in another thread -pyro button installDP-141623 IDLE PLUNGER (5) DP-141624 IDLE PLUNGER (7) DP-141625 IDLE PLUNGER (10) DP-141626 IDLE PLUNGER (12) DP-139894 IDLE PLUNGER (15) DP-140417 IDLE PLUNGER (17) DP-141629 IDLE PLUNGER (20) DP-141630 IDLE PLUNGER (22) DP-141631 IDLE...

It's a good idea to replace those plastic lines even of you are keeping the hand pump. They get very brittle, the dot air brake line seems to last longer. I also ran a 3/4" hose from the filter to the pump, trying to reduce restriction.

That's what I was thinking. Stock for some of the big cams where 180 - 190. I've heard of them being turned up over 200 but that's awfully hard on the cam and rods. I have a turbo coming to help the egt. Then I guess I'll be looking for a button!

I got 160 - 165 psi. Stock with dual lines. 1/4 turn brought it up to 175. Still running about 1100 ° egt. I'll probably play with it some more after I drive it a little. Hit some hills and make sure my numbers are good.