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oil pressure? if so oil viscosity should have an effect on vane timing. Right?
Mitch
Mitch
what controls turbo vane angle?
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ok, but then it would effect how fast it opens. The amount of oil that passes is dependent on viscosity
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5,464 Posts
[ QUOTE ]
oil pressure? if so oil viscosity should have an effect on vane timing. Right?
Mitch
[/ QUOTE ]
If you want to get precise I suppose you could make that assumption. There is not a large volume required to move the actuator and to be honest, I don't think that any change in oil viscosity will make any notable or even detectable change in VGT timing or speed... but in theory, it is possible.
[ QUOTE ]
ok, but then it would effect how fast it opens. The amount of that passes is dependent on viscosity
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There is an upgraded turbocharger drain tube with a larger inside diameter to reduce any restriction that might cause the actuator to move slowly or with reduced force. The drain is not only for the actuator but for oil that lubricates and cools the bearings as well. We are advised to use the new tube when reconditioning turbochargers on the 6.0L engine. The main issue for these turbos is sticking, either due to rust or carbon build up. I would be more concerned with that having an effect on performance than viscosity... or are we talking about something else? /ubbthreads/images/graemlins/shrug.gif
oil pressure? if so oil viscosity should have an effect on vane timing. Right?
Mitch
[/ QUOTE ]
If you want to get precise I suppose you could make that assumption. There is not a large volume required to move the actuator and to be honest, I don't think that any change in oil viscosity will make any notable or even detectable change in VGT timing or speed... but in theory, it is possible.
[ QUOTE ]
ok, but then it would effect how fast it opens. The amount of that passes is dependent on viscosity
[/ QUOTE ]
There is an upgraded turbocharger drain tube with a larger inside diameter to reduce any restriction that might cause the actuator to move slowly or with reduced force. The drain is not only for the actuator but for oil that lubricates and cools the bearings as well. We are advised to use the new tube when reconditioning turbochargers on the 6.0L engine. The main issue for these turbos is sticking, either due to rust or carbon build up. I would be more concerned with that having an effect on performance than viscosity... or are we talking about something else? /ubbthreads/images/graemlins/shrug.gif
Joined
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106 Posts
My truck has a new turbo in it installed at a dealer in TX. I want the truck to last as long as possible. I am thinking that running 40w oil might be a cause of premature hpop failure and also a cause for intensified turbo lag. I think I am going to use the 30w oil from now on. Any suggestions on which will hold up the best against shearing. I don't believe oil is designed for use a hydraulic fluid. INTL would have been better off designing a small hydraulic system to power the injectors. It would have lasted forever. I really like my truck and plan on working through any issues that may arise. Is changing a HPOP very difficult? I am an aircraft tech and am pretty handy with a set of tools. My truck is not chipped or tuned and the exhaust and intake are stock for now. I will probably upgrade the exhaust and possibly intake. I am Leary of chips and tuners.
Mitch
Mitch
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159 Posts
Sorry to revive an old thread but I have experienced the EXACT same issue today.
I just changed my oil back to Delo 15W40 (from 5W40 Rotella Syn) and the first drive I noticed the truck lagging badly and boost would only hit 20lbs instead of the normal 27lbs when accelerating hard.
The truck drove this way all the way into town (10 miles). When I came out of the store the truck ran perfectly normal. Now it may be a coincidence but we just reached the end of a long streak of warm dry weather and the day was rainy and cool. Could the humidity effect the VGT control valve or was it the thicker oil? The truck never ran better than when it had the 5W40.
Also, how much is a VGT control valve? I am not about to try and get the truck to do it for the dealer as I dont have that much time.
I just changed my oil back to Delo 15W40 (from 5W40 Rotella Syn) and the first drive I noticed the truck lagging badly and boost would only hit 20lbs instead of the normal 27lbs when accelerating hard.
The truck drove this way all the way into town (10 miles). When I came out of the store the truck ran perfectly normal. Now it may be a coincidence but we just reached the end of a long streak of warm dry weather and the day was rainy and cool. Could the humidity effect the VGT control valve or was it the thicker oil? The truck never ran better than when it had the 5W40.
Also, how much is a VGT control valve? I am not about to try and get the truck to do it for the dealer as I dont have that much time.
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856 Posts
<font color="blue"> ciscofreak ,
That is an interesting post. The last oil change, I switched to Rotella 5W-40 and didn't notice any improvements, so I was going to switch back to Delo 15W-40 (engine has used this all it's life - 65,000 miles - oil change every 5,000 miles). Now I kinda wonder if I will see the same results. I'll will be sure to check that!
Thanks, </font>
That is an interesting post. The last oil change, I switched to Rotella 5W-40 and didn't notice any improvements, so I was going to switch back to Delo 15W-40 (engine has used this all it's life - 65,000 miles - oil change every 5,000 miles). Now I kinda wonder if I will see the same results. I'll will be sure to check that!
Thanks, </font>
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159 Posts
No problem Joey. I am thinking of switching back to Rotella 5W40 and running it all year around.
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