6.0L Power Stroke Engine and DrivetrainDiscussion of the 6.0L Power Stroke diesel engine and drivetrain in the 2003-Up Super Duties and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.0L Power Stroke engine.
I have an 05 6.0 PSD just got it outta tha shop, new head gaskets, arp head studs and egr cooler bypass kit. I cant buil over 21 pounds of boost. I know this is low and should be higher. The truck still feels strong and runs great just my boost levels are not what they were before all the work. All my sensors are good, MAP 14.7, Barao 14.7 & EBP 14.6. Also took control of the VGT at 85% once this was done it went all the way to 30 PSI. It went to so high it started fluttering due to high back pressure. but when I drive my truck and mash it i am only gettin 21 PSI. Even with a bully dog down loader in extreme performance i only get 21 PSI with it to tha floor. At high speeds it will hit about 25 but thats goin over 90MPH (i really dont drive that fast). My turbo still spools up quick but wont go no higher than 21 PSI. I dont get it, pulled the IPR cleaned the screen. Checked all my charge piping and everything is tight, I even have the new updated blue ford couplings for my intercooler piping. Also swapped out the right bank charge pipe (the one that feeds the EGR cooler on passenger side) with an 04 charge pipe that dont have the scoop to the EGR cooler, its just a smooth shot to the exhaust side of the turbo. But still low boost. I talk to all kinds of guys who put on these bypas kits a swear they get 30 to 35 pounds outta there stock VGT. Why cant i be one of those guys, some one hit me back if they have some good info to help me out thanks.
I am far from an expert. Just guessing. I saw there were no posts yet for you. I am also not sure if your 6.0 has this or not. But if it does i would check the wastegate. I can just imagine while all that was apart, your wastegate getting some exhaust junk stuck in it, keeping it open. Either that or a leak somewhere else. Just a guess from a noob.
you sure there are no leaks coming from the manifold to up pipe joints and up pipes to collector? and yes, 21lbs is low for sure on a 6 liter, I've got a buddy with a noisy turbo'd '03 that will peg out a 35 lb boost gauge no problem. Weird though, you'd think it's be the vanes, but as your test proved if that was the issue, it'd be making more boost because they'd be stuck closed. is it as quick off the bottom? or does it act like the vanes aren't moving at all?
you sure there are no leaks coming from the manifold to up pipe joints and up pipes to collector? and yes, 21lbs is low for sure on a 6 liter, I've got a buddy with a noisy turbo'd '03 that will peg out a 35 lb boost gauge no problem. Weird though, you'd think it's be the vanes, but as your test proved if that was the issue, it'd be making more boost because they'd be stuck closed. is it as quick off the bottom? or does it act like the vanes aren't moving at all?
Evan,
Yeah it pulls thru the power band great and about mid range (2500 rpms) thats when it max's out boost. Now my boost is starting to drop I barely hit 20 PSI until about 60 MPH after 60 I will mabye get 21 PSI until i hit 80 MPH + then i am lucky to get 23. So from take off it still pulls strong, before even when I had my bully dog on the low setting I would blow black smoke no it hardly blows black only if I am in extreme performance. Now my MPG is starting to go south. With my programer before all the work I had got done my message center would tell me that i would get 20.8 MPG at 70 MPH. But now I do good to get 15!!! My tabs on the intake manifold are pointing up so i know they were correctly installed. The been trying to get the tech I am working with to pull my turbo for inspection. He does not think it the turbo he is leaning more to something that controls my boost is the cause but we are both stumped. I didnt think that the EGR cooler bypass kit would cause low boost, if you think about it I know have more exhaust going to it than before due to no flow thru the EGR cooler. The tech even installed an 04 charge pipe that does not have the scoop to the egr cooler so i get mam exhaust to the turbine. Seems like its getting worse. The only thing the tech and I have not done is install a mechnical boost gauge to verify boost pressure but my truck is starting to feel like its just making a lot of nosie and goin no where.
Thanks for the reply,
I am far from an expert. Just guessing. I saw there were no posts yet for you. I am also not sure if your 6.0 has this or not. But if it does i would check the wastegate. I can just imagine while all that was apart, your wastegate getting some exhaust junk stuck in it, keeping it open. Either that or a leak somewhere else. Just a guess from a noob.
not trying to punk you out but there are no waste gate setups on these engines. When EBP (exhaust back pressure) is higher than the intake manifold pressure the EGR induces exhaust gases to the intake manifold. So insense the EGR valve acts like a waste gate. but this would not apply to me sense I have the EGR cooler blocked off at both ends that prevents exhuast gas coming back thru the cooler to the manifold. FYI but thanks for the input it would make sense but the 6.0 PSD dont have a waste gate.
Where are you testing it? I've noticed (only on my factory gauge) that I will only break 21-22 if I'm climbing a hill, towing or both. My max is 27-28ish. General around town driving - it doesn't matter what I do. The numbers are not going very high. It could just be the latest flash if you just had it in the shop. Mine was tamed down a bit after it's last visit to the dealer.
Does it make the same peak boost stock vs. with the programmer? If there are no turbine side or compressor side leaks, and it's not smoking of making boost, that sounds like (although rare) it may be a fueling or hpop issue. Have you run more than a tank of fuel through it? When we're your fuel filters last changed?
Does it make the same peak boost stock vs. with the programmer? If there are no turbine side or compressor side leaks, and it's not smoking of making boost, that sounds like (although rare) it may be a fueling or hpop issue. Have you run more than a tank of fuel through it? When we're your fuel filters last changed?
I am testing it on the highway goin up hill, I did just get it outta tha shop sense i just hogt all this work done to me engine. Evan u say ur friend has an 03 that gets 35 PSI, does he stock exhaust? Even when i run my programer in extreme performace it does the same thing, same boost levels. Of course i brought my truck back to the dealer and let the tech look at it. We were trying everything, he even replaced my fuel pump due to my fuel pressure was a little low and we were thinking that this may be a cause. I was a little worried that when the tech reprogramed it that may tame the engine a little. But a programer should be able to trick the vgt to get those higher boost levels right? If an engine can sense no no flow thru the EGR will it deregulate the engine fuel delivery or just prevent it from running harder? My filters are clean and I have already ran 4 tanks of fuel sense the work. The tech is in my back pocket and were working on this together he is also looking for a solution.
not trying to punk you out but there are no waste gate setups on these engines. When EBP (exhaust back pressure) is higher than the intake manifold pressure the EGR induces exhaust gases to the intake manifold. So insense the EGR valve acts like a waste gate. but this would not apply to me sense I have the EGR cooler blocked off at both ends that prevents exhuast gas coming back thru the cooler to the manifold. FYI but thanks for the input it would make sense but the 6.0 PSD dont have a waste gate.
David
That's good to know. I appreciate you telling me that. I love problem solving and this site is a lot of fun to read. Thanks!
Yup it has a full 5 inch, an aem brute force intake, and a bully dog programmer. It's the best runnin 6 liter I've piloted! Ran a 13.8 with those mods listed above. Trans is broke now so it's getting the works. And I'm stumped on your truck but will ask my other diesel buddies.
Thanks buddy forthein put, man i would figure 5" would be to much for a stock turbo. I am thinkin that sense the tech reprogramed my PCM to the lastest calibration it tamed it down a bit. But he is tellin me that there is a way to reflash it back to "as built data". Were still gonna tear into tha turbo this weekend and go from there. Does ur buddy bypass his EGR cooler?
On other forums a epa limp mode has been discussed which when low or no colant is sensed by the egr it will not actuate the turbo correctly and thus causing the low boost. The problem is 05+ trucks. The 03-04 were flashed to the new programming but not all 03-04 trucks got the flash so for them it is hit or miss. At this point there isn't a tuner that can access the epa limp mode to remove it your ficm has to be retuned. I would do a google search for "epa limp mode" "6.0" and see where that takes you for more info on the problem
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2006 f250 4x4
crewcab short bed
lariat 6.0psd
auto, electric tcase
soon to have isspro
fire/air/trans/fuel
stock suspension and
pretty much everything
else
I had an issue with my 05 6.0 that sounds like it may have been the same. My boost would not go over 20 even in extreme mode on my edge juice box and I had difficulties passing anyone on the highway. I had taken the truck to the shop and found that nothing was wrong. Turns out where I had been buying my diesel they were pumping B20 Bio without marking it on the pump and this was my problem. Once I got rid of that Bio and ran a tank of good stuff in the tank I never had the problem again.
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