hx-40 has bigger compressor wheel, spools slower.

 

With a 3200 RPM spring you can easily run 70 in 4th. If you are running 60 in 5th uphill when loaded it is gonna get hot. Drop a gear and let 'er eat.

Crewcabxlt got the turbo question.

 

I think I understand. Turbines are almost the same size, then spinning the compressor at the same RPM. With a larger compressor wheel (HX40W) it moves less air at slower RPMs? That's why a 16cm is needed it spins faster?

70 in 4th......WOOW. I usually shift to 5th around 50 to 60. I really need a tac. What is my max speed, I think I have 3.53 gears? Before my mods she did about 75mph floored in 5th.

 

Mash on it. Don't be afraid to stay against the governor. On a steep hill and you start losing RPMs drop a gear and mash on it. More power=more fuel and air-more turbo will cool you down to some extent with what you have now but you probably need a 16cm housing for your HX40 or I think so IMHO. You keep running at 1500* your going to need pistons and maybe a bore job. It's a fine line kinda like adjusting a torch-too much fuel and not enough air equals smoke, to much air and not enough fuel equals no power, when the two are correct equals horsepower. Lugging it will create the egt heat and put premature wear on the GETRAG 5sp. So mash on it and make the lil cummins work and earn it's keep. Good luck with it.

 

Jer12377 ask crewcabxlt about the turbo he runs. He runs a HE351cw on his truck and does a great job for him. I think he has stated it runs alot cooler than some of the other turbos with a load, but talk to him about it because I may not have the facts correct. Good luck.

 

What would be the max safe sustained rpm if you were pulling a long grade towing . There's a big difference between 3rd and OD with an auto. I try to stay around 2500rpm when I'm out od OD but I'm getting the impression I can go a higher.

 

As long as it's still pulling, let it wind up. You will not over-rev it with a load behind it.

 

My only fear about always holding it at the gov is floating a valve, or something worse. I definitely need more air. With the smoke and the EGTs I think I am getting enough fuel.

I will thanks.

 

I have hit 3600 and not floated the valves. Must have been close.

 

Not to meantion the turbine is also bigger measuring 65mm.

I've run 2700/2800 rpm pulling hills with mine before, I usually don't shift into OD until I'm doing at least 65/70. Trying to keep the egt's down below meltdown with POD's and a WH1C turbo, the trick was to keep the rpm's up and the boost below 30.

I've said this before and I'll say it again, for all you guys with the timing advanced a little and towing with sustained egt's in the 1200F range, even though your temp looks safe the extra timing keeps the heat in on the piston and rings longer and you can scuff a bore. My engine has some very small scuffing in #1 cylinder from that. Not enough to feel, but enough to see.

 

Ive got a small timing bump. I have seen substained egt's of up to 1250, not cool at all. But when you are all loaded up at 10 ton gross, your w/m shuts off for some odd reason and your on a 8% grade, whats a guy supposed to due? I just kept downshifting, ended up in 2nd doing 22mph. it was sweet. I had just had a look at my cylinder bores a couple weeks before, looked new still. Now I try not to think about it. How can you tell, performance wise if you have scuffed something? Im not about to pull the head.

 

When I am, I will go as high as 1350, I try not to keep it there very long but I will get there and start to roll off the throttle. Today towing the gooseneck and tractor I saw 1200 pulling some good hills in 3rd. The heat doesnt bother me, I just want to be able to pull these loads with a lot less effort and a lot more speed. I think its time for a bigger turbo and maybe a better A2A. I eill hopefully post some pics tonight yet.
DS79

 

There is no way you are gonna spin it tight enough to hurt anything pulling a load uphill in 4th. The governor will defuel it before then.

To go along with JD730's post - Lots of timing plus lugging is going to crack a piston. Don't let these things bog down, keep them wound up when you are working them. When you hit flat ground then you can run 5th and loaf - assuming you don't have a bad headwind.

 

Ok here are some pics of my truck loaded down and Dads D600 kinda loaded





I have some more of us pulling but those can go somewhere else.
DS79

 

We don't have any hills to speak of down here. What we have is some long grades nothing compared to other parts of the country but these grades we have may be 3 to 7/8 miles from start to finish. Knowing where they are I'll ease into my ole rides and get steam built up and work the daylights out of the engine. Don't be scared to run against the govenor that's what it is on there for, when the pyro starts going up toasty back off or drop a gear, if you drop a gear mash on it and just repeat the above till you top out the hill. The only thing to worry about is the EGT, don't lug, don't be afraid to run against the governor. I've seen diesels in irragation setups that run against the governor for days with no problems. Ya just gotta get over the gasser mentality and stand on the skinny pedal and drive by your gauges, let the engine work and let the gauges tell you what to do next. I'm not raggin on anybody but the ole diesels just have to have a different driving style to perform like they should.