NHC-250 turbo installed on M923A1

[crewcab454]

I thought I would post some pics of my turbo install. After reading several post on here I wanted to add power to my 250 cummins. I salvaged all the main parts from a local big truck wrecking yard. The turbo alone made very little difference to me. Just a nice whistle. I installed my egt gauge and I was only seeing 800-850 pre turbo. I pulled my pump apart and it had a 30 button in it. I slowly stepped down to 20 then 17 then 10 and I am at a #5 button now. I see 1150 pre turbo on a long pull with the 5. It has 5" exhaust to a 6" stack and sounds mean. It runs like a total different truck. Very little smoke, 15-16psi boost, and actually has some power now. the air filter is temporary and I am fabricating the tubing to hook up to my original air filter now. Anyway, thanks for all the information and I hope my pics can help someone as yalls have helped me.

 

[Stein12501]

Excellent looking setup. Love to try that on mine. Maybe next year.

 

[wreckerman893]

250's do not like heat. When you turn the fuel to them you have to know how to drive them. You do not want to keep your foot in the fuel on a hard pull. Back off the throttle and let it pull in a gear it's happy with. Even with a turbo and pyro you can get it hot before you know it.

 

[crewcab454]

thanks stein, and i understand wreckerman. there is no longer a need to put your foot in it.

 

[jdknech]

this is the same intake and crossover that i have on my truck.. have you fabbed your intake piping yet?

 

[crewcab454]

 

[trukhead]

Nice fab work! Some place in PA about 10 years ago talked of how the modded 400 big cams to put out 800 hp for the over the road rigs. The truckers talked of not needing to down shift for most hills. Things like Moly coated pistons and cams and such. Maybe the 250 needs a little hot rodding?

 

[jdknech]

very nice! is that exhaust pipe that you used for the piping?

 

[crewcab454]

Thanks trukhead and I agree. And yes jdk it is 5" exhaust pipe. A short straight piece , a 45, and a 90. The rubber elbows I picked up at a local truck salvage yard.

 

[doghead]

When/if you ever load the truck and drive it, I think you'll be melting down.

 

[jdknech]

Thanks trukhead and I agree. And yes jdk it is 5" exhaust pipe. A short straight piece , a 45, and a 90. The rubber elbows I picked up at a local truck salvage yard.

this is the only thing lacking on mine.. thanks for the info.. only thing i have to figure out now is my heater core box.. the turbo sits right in the way of it..

 

[jdknech]

When/if you ever load the truck and drive it, I think you'll be melting down.

i agree IF he loads it down much.. this is why I'm not turning my fuel up as much...

 

[crewcab454]

That's why I installed a pyro. I pull a car hauler occasionally now that I finished my hitch and trailer lighting. 99% of the time it is empty. I never see over 900 running around town. My heater box is in the stock location. It is very close to the turbo.

 

[jdknech]

good deal... did you get your buttons online, or local?

 

[crewcab454]

the local pump shop we use for all our small truck (1 ton and down) diesel parts has them in stock.

 

[l3oss]

What turbo did you end up using? ....Holset HT3B HT4B HX60?

 

[crewcab454]

what turbo did you end up using? ....holset ht3b ht4b hx60?

ht3b