Well I got the intercooler back on the truck this morning. Pressurized the system and can't hear any leaks. The pinhole I found and repaired is holding but there was no increase in boost pressure. In fact it may be one lb less. What's up? I can only get 17lbs of boosts at wot 1200*.

The exhaust is pretty clean once the boost comes up. Does that mean I need more fuel to increase boost? My goal was to decrease my temps while pullin my fifth wheel. Didn't try that yet so no infor there.

Thanks for the help

 

I'm baffled. I thought for sure the boost leak was what was holding you back. I think you should be making more boost with the temps you are seeing.

You still have the exhaust dumping right in front of the RR tire, right? What kind of muffler is on the truck, is it a diesel muffler (straight through) or a turbo muffler (reverse flow)? I'd consider replacing the muffler with a diesel muffler or a glasspack, and maybe going to 4" once it gets past the transfer case. If you can get the muffler off without doing surgery, take it off and do a test run before you spend money. I don't think the E-brake has anything to do with it, it didn't build much boost when I drove it before you got the E-brake.

More fuel is just gonna make it hotter at this point. Have you bumped the pump timing back up yet, I remember that helped your temps some before.

 

Yeah I thought so too. I was really lookin forward to seeing at least low 20's boost. The hole was a pretty good size pinhole.

 

Maybe a Blown Hose somewhere .. I say go ahead and TURN -UP the Fuel screw and See what happen's..if there's still no Boost ,Then I would think that would narrow it down to the "Charge Air System"..somewhere along the line.WATCH the TEMP's if you do this..I think that it's worth a Try

 

What I am trying to accomplish here is more pulling power. To tell ya the truth she is doin pretty well now the way it's set up.

This is my thinking, tell me if I am off base.

The reason for the boost is to help burn the fuel and keep the egt's down. When looking at the exhause under a pull at lower rpm she will smoke pretty good but not to the point where the car behind ya is invisible. As the rpm and boost increase the smoke clears and when pullin she is almost clear maybe just a bit of a haze. I should think this means the turbo is doing it's job in puttin enough air in the cylinders to burn the fuel. If I increase my fuel supply my temps will go up and the smoke will get worse do to the face not enough air is being introduced to the cylinders. I don't want my egt's to get any higher. I have to watch them now while pulling. If my exhause is "clear" that means the fuel is burning. I could increase the fuel supply but that would only create smoke and higher egt's. In other words I very well may be set as close as I am going to get with my setup.

Is this right or am I all wet?

 

thumbs...how does the turbo feel? Pull the inlet pipe off and grab the compressor wheel. Move it up/down/side/side, spin it, and check in & out play. Also check the inlet pipe for leaks.

Have you tried a different boost gauge?

I'd check the gauge tubing, the fitting on the intake, and try another pressure gauge...just a cheapy psi guage.

 

You are right about boost and adding more fuel -- you can only add fuel until your EGT gets too hot, and you are already there.

The way I see it: You had a good sized leak in the aftercooler. You have now fixed that leak. If everything else had stayed the same, you WOULD have an increase in manifold pressure.

The first thing that I would do is go over all of the connections from the turbo to the manifold. If you can't find anything, I would hook up your test set-up again, and do another pressure check -- maybe boost, heat, and vibration killed your patch on the first go ( I hope not! and don't really think so, but you never know until you look).

There is something wrong, and most likely it is something leaking. It might be something new, or it might be the same old thing that you just haven't found yet. All I can suggest from far away is that you be methodical, and keep at it until you find it.


Good luck,

Alec

 

I agree, your theory is sound. The only problem is your truck is not making the boost it should from the mods listed. I get 25psi @ 1000* or so pulling with a pretty similar setup I think. Alec's advice is good, triple check all the way around the hoses and connections.

 

Well I'll take it out under load for the next couple of days and see what happens.

 

Hey,
Thinking outside the box, have you checked the air filter and other help-wind-the-turbo-up-early things? If you have restricted input to the turbo, or a kink in the exhaust (mine was over the rear axle) this will keep your temps up and your boost down (or slower to increase boost).
-Jim-

 

Yep the exhaust is cleanedup and exits before the rear wheel. The filter is a new AFE about 8K on it. I tried to get the muffler off this afternoon to check it without it but I couldn't get it to budge. Since I will be on the road for the next couple of days I really didn't force the issue.

 

What I was talking about earlier was just for TESTING purpose's ONLY..Just to see if it made a change in boost..

 

My 2 cents worth:

It takes fuel and air to create exhaust pressure which makes boost pressure. I have a non-intercooled CTD which has large injectors stock. Normally I can get about 30 or more pounds boost. Whenever my fuel filter gets old, I find that boost drops off when I flog it hard (fuel starvation). My EGT's also remain quite low. I would guess that the bottleneck in your system is injector size as you have a new fuel filter. It might be that your injector pump is not up to snuff but I suspect it is just your smallish injectors that keep your boost low. By the way, even when my higher speed/load boost is low(due to fuel filter restriction), I can lay down a lot of smoke at lower rpm's

I think larger injectors would solve your problem.

Are your EGT's low

 

Yeah I'm out of ideas. In fact after I fixed the IC leak I lost two pounds of boost!!!!!

I just got back from a trip to NY with the fifth wheel. It ran good but I couldn't get the boost over 15 lbs. I'm not upset with the way it runs but I would like to get the boost up. Like I have been saying I have a lot of throttle left but I run out of temp.

Yes my temps run high. I don't let it get past 1200*. When I shift most but not all the time I can run it as hard as I want and it will stay under 1200 when pullin.

 

There's gotta be something restricted or leaking somewhere. Is the turbo original to the truck? Maybe some weekend I can swing by and we can swap my old H1C on to see what it'll do.