VGT% question
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Laughing Gas
Joined: Sep 2006
Posts: 1,097
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From: Minnesota
VGT% question
Ok, so on my way to Atlanta, two weeks ago I removed the turbo and cleaned the unison ring and the vanes, my VGT% seems to be good but pulling a small hill today at 15 to 18 lbs of manifold pressure and when I let off at the top of the hill the VGT percentage wold drop to 15 to 20% and stick there til I got back into it a little and then go back up to around 40 to 50%, I am thinking the unison ring is binding and when I get back into it, it free's up the ring and back to normal.
One other question,how is the % value measured, is it possable for a value to show on my CTS and the unison ring not correspond to the % shown?
Thanks
PS: drove through Mt Vernon Il and down I64 to I24, 58 cars in the ditch/median and about 10 semis out in the ruhbarb ;(
One other question,how is the % value measured, is it possable for a value to show on my CTS and the unison ring not correspond to the % shown?
Thanks
PS: drove through Mt Vernon Il and down I64 to I24, 58 cars in the ditch/median and about 10 semis out in the ruhbarb ;(
Posting Guru
Joined: Jun 2012
Posts: 1,171
Likes: 2
The way to tell if the vanes are moving is to monitor your boost. If it goes to zero at idle, you have decent low end throttle response and it goes above 20 but not above 28 psi if you hop on it, it is probably working right and not sticking. 2005 should have a wrench light that will come on if the computer detects over/under boost compared to what it wants, which is the symptom of vanes sticking. VGT% is, as noted above, what the computer is asking for, not what the turbo is doing. There is no way to directly monitor what the actual VGT is.
Brian
Brian
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