Variable Vein Turbo problem - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 01-09-2008, 09:45 AM Thread Starter
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Variable Vein Turbo problem

Ok I was told that the turbo in my 05 F250 is a Variable Vein Turbo ( I dont really know much about it) and I was told that the variable vein is one of the first things to go wrong with the turbo. I was told that when it goes bad that you get no low rpm boost so when leaving from a stop you get a bad lag and then the high rpm boost kicks in. Does anybody know what I am talking about and have any suggestion on what to do because i have 80k miles and if it is a problem i need to get it fixed soon. Thanks for your help.
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post #2 of 11 Old 01-09-2008, 10:11 AM
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If it isn't broke then there's nothing to fix. If you have 80k on the truck and your tubo is working fine then I think you have a good turbo.If I were you I would keep doing whatever you've done to the truck for the last 80k.

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post #3 of 11 Old 01-09-2008, 12:13 PM Thread Starter
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well the truck runs good, but it does have a big lag before the turbo kicks in. So that is what I am thinking might be the problem with the lag is the variable vein?
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post #4 of 11 Old 01-09-2008, 12:37 PM
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Be sure you put yer foot in it once everytime you drive it and really work that turbo...thats what makes them last.
All the 6.0s in stock mode have a lag at low RPM - thus the reason for the dual turbos on the new 6.4
Get a tunner like an SCT and that lag will disapear.

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post #5 of 11 Old 01-09-2008, 02:35 PM
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Quote:
Originally Posted by hatcher1105 View Post
well the truck runs good, but it does have a big lag before the turbo kicks in. So that is what I am thinking might be the problem with the lag is the variable vein?
I think your fine.
BTW your turbo has vanes your forhead has veins.

-2003 F350 6.0 Fx4 Lariat w CLOUDRIDER grill
-12/02 build
-Toyo Open Country AT2 Xtremes 285/75/18
-4.30 gearing
-SCT current tune: Quick Tricks 40hp tow w/ Jake Brake
-Banks turbo back exhaust
-CFM+ largemouth intake kit
-DJs Fuel Intensifier
-Dieselsite coolant filter
-BD Diesel CCV filter
-Fumoto drain
-Autometer Cobalts in woodgrain pillars.
-Powerslot Cryo rotors & Hawk LTS pads
-KYB Monomax & Ride-rite airbags
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post #6 of 11 Old 01-09-2008, 03:00 PM
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The Variable Geometry turbo uses oil pressure to turn a unison ring within the turbo, thus changing the pitch of the turbo. The problem is that the unison ring seizes to the turbine housing, sometimes open mostly closed though. If it sticks open, it will overboost and blow up the CAC. If you remove the turbo, the 11mm nut and split the turbo in half, you will see what im talking about, just clean the ring with die grinder/sanding pad, coat with Never seize, and perfect for another 25000 miles.Dont forget to reinstall oil drainpipe and tighten the CAC to 103in/lb.
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post #7 of 11 Old 01-09-2008, 03:03 PM
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I had to do 2 of them today. it's easy.
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post #8 of 11 Old 01-09-2008, 06:08 PM Thread Starter
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Quote:
Originally Posted by snoboy View Post
I think your fine.
BTW your turbo has vanes your forhead has veins.
LOL I was never really good at using words or even spelling them correctly
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post #9 of 11 Old 01-09-2008, 06:41 PM
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Quote:
Originally Posted by snoboy View Post
I think your fine.
BTW your turbo has vanes your forhead has veins.
hahahaahahahah

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post #10 of 11 Old 01-09-2008, 06:43 PM
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Quote:
Originally Posted by snoboy View Post
I think your fine.
BTW your turbo has vanes your forhead has veins.
BWAHAHAHA!!

that's too funny! make sure to get into the go pedal a little bit mang, don't be afraid, live it up a little! these trucks are made to be pushed!
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