Talking about 6.0 Turbo problems,,,,
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Posting Guru
Joined: Jan 2003
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From: Eastern CT.
Talking about 6.0 Turbo problems,,,,
Now this is just a thought,,,Seeing one of the issues on the 6.0's is the rusting up of the variable vanes on the exhaust side,,,Just thinking here,,would'nt it have been a smarter design to have the varible vanes on the air intake side of the Turbo ? I mean it is always clean air,,and it seems that alittle bit of oil residue is usually present which would also help keep the vanes in working order.
Now I know someone will say it would never work,,but why could'nt the varible vanes, with the acuator, and unison (spelling) ring be enginered to work on the clean side of the Turbo,,controling the Boost PSI, and letting the dirty exhaust side just spin it up like on most turbos.
I mean it seems to me,,that having variable vanes that need to move and slide should not be in the hot exhaust dirty side, but on the clean air oily side for things to work freely with much more reliability. Lets hear it !,,,,,Mark
Now I know someone will say it would never work,,but why could'nt the varible vanes, with the acuator, and unison (spelling) ring be enginered to work on the clean side of the Turbo,,controling the Boost PSI, and letting the dirty exhaust side just spin it up like on most turbos.
I mean it seems to me,,that having variable vanes that need to move and slide should not be in the hot exhaust dirty side, but on the clean air oily side for things to work freely with much more reliability. Lets hear it !,,,,,Mark
Junior User
Joined: Feb 2005
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I really don't know, but I would venture a guess that it has something to do with turbine rpm. If you had the same amount of exhaust pressure driving the exhaust turbine and lessened the load of the compressor turbine, it would seem that this would increase the overall rpm due to the decreased resistance on the compressor vanes yet still having the same pressure on the exhaust vanes..
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Joined: Jan 2007
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Vgt
I think of it like a compressor that you can vary the volume amount by reducing or increasing the surface area.
Likewise, in a Turbo application you can increase or reduce the exhaust air path volume, which directly increase of reduces the speed of the compressor wheel, by regulating the angle of the vanes relative to the turbine wheel.
If the compressor side of the turbo was used to regulate the speed of the turbo then the volume of air would be proportional as well.
Likewise, in a Turbo application you can increase or reduce the exhaust air path volume, which directly increase of reduces the speed of the compressor wheel, by regulating the angle of the vanes relative to the turbine wheel.
If the compressor side of the turbo was used to regulate the speed of the turbo then the volume of air would be proportional as well.
Postmaster
Joined: Sep 2005
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From: Florence,SC
if the vanes would be on the compressor side, then you would have compromised your power. if you set the turbo up on the exhaust side for a one size turbine housing, you will have one of two things, if the housing is big you will have major lag but great boost pressure and if it is small then you will have no lag and little boost. the vanes help spool the turbo up qicker and makes the one vv turbo act like 2 turbos. besides if you adjusted the compressor side it would cause all kinds of turbulance which we all know kills power. i know there are issues where the turbo sticks, but 95% of my turbos that i have replaced have been on low mileage "grocery getters", or once in a while 5er pullers. these trucks were not ment to sit, no diesel is. they are work trucks and today america want big and bad so the crew cab diesel came about with all the options. you drive these trucks for what they are intended and alot of he issues would probably dissapear. plus if people dont drive them because they are worried about there warranty expiring, they should have never gotten a vehicle that they cant afford to start with.
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Joined: Jan 2004
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From: northern,california
Originally Posted by BowTieHatr
if the vanes would be on the compressor side, then you would have compromised your power. if you set the turbo up on the exhaust side for a one size turbine housing, you will have one of two things, if the housing is big you will have major lag but great boost pressure and if it is small then you will have no lag and little boost. the vanes help spool the turbo up qicker and makes the one vv turbo act like 2 turbos. besides if you adjusted the compressor side it would cause all kinds of turbulance which we all know kills power. i know there are issues where the turbo sticks, but 95% of my turbos that i have replaced have been on low mileage "grocery getters", or once in a while 5er pullers. these trucks were not ment to sit, no diesel is. they are work trucks and today america want big and bad so the crew cab diesel came about with all the options. you drive these trucks for what they are intended and alot of he issues would probably dissapear. plus if people dont drive them because they are worried about there warranty expiring, they should have never gotten a vehicle that they cant afford to start with.
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Originally Posted by BowTieHatr
if the vanes would be on the compressor side, then you would have compromised your power. if you set the turbo up on the exhaust side for a one size turbine housing, you will have one of two things, if the housing is big you will have major lag but great boost pressure and if it is small then you will have no lag and little boost. the vanes help spool the turbo up qicker and makes the one vv turbo act like 2 turbos. besides if you adjusted the compressor side it would cause all kinds of turbulance which we all know kills power. i know there are issues where the turbo sticks, but 95% of my turbos that i have replaced have been on low mileage "grocery getters", or once in a while 5er pullers. these trucks were not ment to sit, no diesel is. they are work trucks and today america want big and bad so the crew cab diesel came about with all the options. you drive these trucks for what they are intended and alot of he issues would probably dissapear. plus if people dont drive them because they are worried about there warranty expiring, they should have never gotten a vehicle that they cant afford to start with.
WOW right on point! Start to finish you just summed it up It is a Diesel TRUCK ment for work not gettin groceries..
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Elder User
Joined: Apr 2004
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From: Wickenburg, AZ
There's definitely something to that. 6.0 horror stories are pretty limited out here in Cowboy Country.
Navistar has used VGT technology for years on their trucks without a whole ton of trouble (They call it EVRT).
Navistar has used VGT technology for years on their trucks without a whole ton of trouble (They call it EVRT).
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I agree with you that the 6.0 needs ran almost everyday and also needs worked very hard. But I feel a diesel that only fits those requuirements only will comply with about 20% of the people that bought them. Ford knew how these trucks get used and should have designed them to last no matter how you use them when spending that much money on a truck. My dad is on his third turbo in his 03 6.0 excursion with 54,000 miles because he only uses it for vacations and trips and sits for days at a time. The techs even told us they ordered a turbo from Ford that had rust from the factory. I feel what he does with his excursion shouldn't be hard on a diesel. JMO Do not mean to offend anybody 
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Posting Guru
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From: Eastern CT.
Ahhh we got some good explenations now !,,Thank you BowtieHatr,,I agree with you 100%,,these trucks and turbos need to be worked,,,sitting alot or just putting around town,,does not exercise(if you will) those vanes to keep them freed up,,When I drive my 06',6.0 after warmup I dont baby it,,make that boost come right up,,and she pulls hard.
I talked to a guy a few weeks ago with a 05' F350,6.0 it's on the 2nd turbo,,only 7,500 miles on the truck,,he said it sits mostly,,I said I think thats the problem ,,the turbo is getting rusted, stuck, etc,,you need to drive it Hard, bring that boost up,,make it work when you drive it,,he said,,you maybe right ! Anyway I was hoping this post would get some replys to what others Ideas were on these turbo issues.
I talked to a guy a few weeks ago with a 05' F350,6.0 it's on the 2nd turbo,,only 7,500 miles on the truck,,he said it sits mostly,,I said I think thats the problem ,,the turbo is getting rusted, stuck, etc,,you need to drive it Hard, bring that boost up,,make it work when you drive it,,he said,,you maybe right ! Anyway I was hoping this post would get some replys to what others Ideas were on these turbo issues.
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Joined: Mar 2007
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From: Qld Australia
Originally Posted by joelykool20
The techs even told us they ordered a turbo from Ford that had rust from the factory. I feel what he does with his excursion shouldn't be hard on a diesel. JMO Do not mean to offend anybody