Show me MAP at 2500rpm while driving down the road, sitting in the driveway is no load at 2500rpm. That's why the map is still at 14.8 and EBP is 16.8.

Is your IPR always 25% at idle? What is the most HPOP you've seen, should be near 4000?

 

Are you tuned?
If your truck can only make 3000psi, then it will never call for full boost... 28lbs, if 20lbs is what's needed for 3000psi... follow me?

That 25.5% at idle is high, indicating a high pressure leak.

 

No IPR will come down to 23.6 HPOP will hit 3900psi but haven't been watching it. Let me toss my shoes on and I'll run down the road.

 

This is where the IPR and HPOP usually are at ever since I've owned the truck.

 

MAF at 2500rpm and the HPOP hit 3980 at full throttle.

 

And you've never gotten the P0299 code? Under/over boost of 4lbs or more and for 5 seconds or more.

You've cleaned every sensor, shown that they have movement and appear to work. The only thing that seems to remain unanswered and a reasonable assumption, at least in my mind.... that the turbo is not capable of achieving full boost because the vanes are physically restricted from moving to the fully open position. VGT is a commanded value, displayed on the screen as VGT, but the only real value of vane position is the boost number from a gauge. Your gauge shows 20lbs... so it says you never get to 28lbs, which would be a full commanded 15-20% VGT.

Are you getting turbo farts? If you step down hard and then let off fast, just as the boost starts to come on strong, the pressure relief really shouldn't be noticeable... but a fart would indicate stuck vanes.

 

No codes. Yes on the turbo farts. I can watch the VGT gauge go from 15 to 80 and the exhaust tone changes. I've been running Matts tow tune for years. When my problem started the turbo would squeak at start up and I started getting turbo farts. I purchased a NEW not rebuild turbo from Garrett. I figured that was the problem. Then after I replaced it I'm still having same issues just no squeak. I took old turbo apart and the unison ring was stuck to turbo and I had to pry it off. Air temp in the intake is the only one that I haven't touched. EBP I didn't clean but I did clean the tube twice. Did you get a chance to look at the data log file I posted? See any thing? I'm going to try and post a video tomorrow morning of the boost gauge.

 

At high idle 1200rpm the truck will make 3psi it did that with with the old one about the time the problems started. Sometimes if I just barely push the gas it will build 26psi real fast then fall to 20 and other times I floor it it will only build 20psi.

 

EBP tells the turbo how fast to respond
MAP tells the turbo how much to respond
and the VGT say's ... this much.
the gauge shows that it responded by how much.

If you haven't cleaned the IAT and EBP sensors, I would do so. If the turbo is farting, it isn't responding fast enough because something is either keeping it physically from doing so or not commanding it. AND even if it was new last year, not exercising the vanes to the full motion eventually will effect operation of full motion.

I jump on mine hard, not just on the freeway or going up hills. And I let off fast to see if I can get a fart, if so, I know I'm not exercising the vanes enough to keep them loose... clean the EBP and IAT sensors.. then consider a turbo cleaning. I think were about to the point we've exhausted all other options.

You replaced the turbo and it was still doing it... kind of points to a sensor. What's the VRef reading, should be right about 4.8-5.0v?
Without a real load, it won't build any real boost, idling in the driveway, you could floor it and get 3.

 

The turbo has less than 500 miles on it. Can I spray electrical contact cleaner in the EBP sensor?

 

could probably use a cleaner that removes carbon, like MAF cleaner or something. Probably the same stuff for all 3, EBP, MAF, IAT.

 

Cleaned all 3. My last ditch effort before I have to take it to the dealership and probably put a second mortgage on my house to fix it. I data logged this morning and shot video of the gauges on my last 6 minutes home. If you go to 6:40 in the video I floored it and I'm not sure but VGT never got to 15% I'm just assuming it should have.

 

Link to video.

 

Will,

I've looked at the data again and watched the video from front to back.

Your EGR is deleted... that in itself reduces restrictions in the intake. It makes it easier for the air to flow, which equates to more air. A small tube or a bunch of bends in the tube would increase restrictions and in turn... increase boost, which is really a measurement of back-pressure. If we used a tube with no bends, boost pressure would decrease as the air would more easily move down the tube. Hope that makes sense.

Matter of fact... 100 cubic feet of air at 10 psi is moved more efficiently than that same 100 feet of air at 20psi. The tuners write the tunes to fool the truck's PCM to prevent it from seeing more than the set point required to trip the CEL. In this case the wrench for over boost, more than 28psi.

The MAP and EBP numbers are responding to throttle in a timely manner. Both showed numbers in excess of 38 psi... which would indicate 38-14= 24lbs boost. The video showed 25.8lbs and numerous time +24lbs. The sample rate of Torque may be slower, why the numbers don't show it as easily, they change fast and the gauge may not be able to display it fast enough to show you.

In the data log @ 470-476 EBP was 47.6-50psi... boost showed 14psi, would have been an over boost condition near 35psi.
In the data log @ 776-786 EBP was +42 psi. 42-14=28lbs ... boost was 24.6- +23 psi

And as the truck speeds up, the demand for high boost drops as the load decreases, even though you have the trucks throttle pinned to the floor.

Do you tow? I'd bet if you hooked something to the truck, then put the peddle down it would hold the boost much longer as it would take more time to reach the point of decreased load the peddle is commanding.

Unload the tune, put the truck back to stock and then stomp the crap out of it a couple times, lets see if you hit more than 25.8lbs boost. If so, which I think you will easily...You and I will pick a good time and date and together...hoist one to the Corps and your truck!

 

The truck is running the stock tune. Have been since I replaced the turbo. All of the data logs that I have posted are stock. Before my problem started my truck would hit 28psi running the tune with the tune now I only get 20psi.No I don't tow much 3 or 4 times a year.