VGT Open at idle... What am I missing?

CT9AIX

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Got back into the MCC thing here recently and I've made plenty of changes to my tune successfully... But I can't for the life of me get the vanes to open at idle? I changed all 3 vane tables, changed all 12 EBP tables, verified the VGT works with other tunes and the rod itself moves freely. I unplugged the VGT and the vanes open right up, plug it back in and it goes back to 50-60% or so and that's about as open as it will go at idle. After I flash the truck the VGTDC will hover around 50ish, I give the truck some throttle and as the RPM's come down so does the VGTDC, but then the VGTDC slowly climbs back up to the 50ish area. Am I missing another table that needs to be modified here?

Thanks in advance from the rusty weekend warrior tuner lol
 

ckrueg

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Got back into the MCC thing here recently and I've made plenty of changes to my tune successfully... But I can't for the life of me get the vanes to open at idle? I changed all 3 vane tables, changed all 12 EBP tables, verified the VGT works with other tunes and the rod itself moves freely. I unplugged the VGT and the vanes open right up, plug it back in and it goes back to 50-60% or so and that's about as open as it will go at idle. After I flash the truck the VGTDC will hover around 50ish, I give the truck some throttle and as the RPM's come down so does the VGTDC, but then the VGTDC slowly climbs back up to the 50ish area. Am I missing another table that needs to be modified here?

Thanks in advance from the rusty weekend warrior tuner lol

I also have had some issues with this. My truck will start out with the vanes at 2% but they always slowly climb up. When I give it some throttle the vgt functions normally, then when the rpms drop below 1000 the vanes open up but then immediately start closing again. Never figured out the problem.

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CT9AIX

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What I can't figure out is a year or so ago when I was playing with MCC I did this mod and it worked perfectly with no issues. I don't have that file anymore I wrote last year to compare, but it doesn't make sense to me.

Your truck drives normal and everything else is fine correct? This is the way mine is which is what's driving me crazy
 

ckrueg

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What I can't figure out is a year or so ago when I was playing with MCC I did this mod and it worked perfectly with no issues. I don't have that file anymore I wrote last year to compare, but it doesn't make sense to me.

Your truck drives normal and everything else is fine correct? This is the way mine is which is what's driving me crazy
Yep everything works perfectly, the vanes just slowly close as it idles. I can't think of why it would do that but I'll look at the tables to see if I'm missing anything.

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ckrueg

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What I can't figure out is a year or so ago when I was playing with MCC I did this mod and it worked perfectly with no issues. I don't have that file anymore I wrote last year to compare, but it doesn't make sense to me.

Your truck drives normal and everything else is fine correct? This is the way mine is which is what's driving me crazy
So I've been making quite a bit of changes to my tune and noticed that the actual ebp seems to be .4-1 psi higher than the desired. Like when my truck idles for some time the vanes close to about 70 % and stop. The ebp at this point is about .8 psi. Also my tables command 3psi when coasting from 1000-1800 rpm but the actual psi stays around 3.4-4 psi. I might try putting a negative number in the ebp tables and see if this works. That way even when the vanes are open the ebp will be well above desired ebp

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CT9AIX

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Have you modified any of the back pressure deviation tables? I was talking to Cody @ ATP and he had mentioned possibly changing those... but I honestly cant remember changing those last time?
 

ckrueg

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Have you modified any of the back pressure deviation tables? I was talking to Cody @ ATP and he had mentioned possibly changing those... but I honestly cant remember changing those last time?
I have not. From the description in mcc they just say max pressure deviation before throwing a code so I didn't think those mattered

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CT9AIX

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I read that as well, but none the less at this point I'm open to all ideas
 

ckrueg

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What is your "minimum torque to allow back pressure monitoring" at? At least I think that's what the value is called. Mine is at zero maybe that has something to do with it

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CT9AIX

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I believe it's whatever the HD300 file has it set at... That's what I'm using for my base file. I'll confirm tonight as I should have some time to mess with the truck
 

CT9AIX

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Tried adjusting the "Min Torque to Monitor Back Pressure" and tried playing around with the deviation tables for back pressure and no change. Whats really killing me now is the fact that something appears to not be right with either the VGT actuator, or a sensor is screwy or something if I cant make this work. The hell with the sound of open vanes at idle... why is this not reacting to my changes is my concern.

Its almost as if something is stopping it from working only at idle. If I rev the engine, or hold it at an RPM above 1000 and just let off the vanes open all the way for that 1 or 2 seconds then slowly start to close as it idles
 
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ckrueg

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Tried adjusting the "Min Torque to Monitor Back Pressure" and tried playing around with the deviation tables for back pressure and no change. Whats really killing me now is the fact that something appears to not be right with either the VGT actuator, or a sensor is screwy or something if I cant make this work. The hell with the sound of open vanes at idle... why is this not reacting to my changes is my concern.

Its almost as if something is stopping it from working only at idle. If I rev the engine, or hold it at an RPM above 1000 and just let off the vanes open all the way for that 1 or 2 seconds then slowly start to close as it idles
Mine seems to do the same thing. I also modified the ebp tables in other places and they changed. It's just around idle I have a problem

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CT9AIX

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Yup, same thing here. I'm going to continue to play with things and see what changes vs what doesn't and hopefully get something figured out. Cody is helping me try to figure it out also now so we will see. I running a 98% unmodified tune from the HD300 files so I don't have to worry about any changes I was trying to make on other things would affect trying to figure this out.
 

Dzchey21

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My race truck did the same thing too. I never could figure it out. My 6.7 works well but at idle it cycles the vanes every so often. I think to keep them from sticking.
 

7.3powerstroke00

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I had a file I built for mine with mcc that had the vgt open at idle. I can't remember everything I adjusted. I know I dropped the ebp tables at low rpms to 0 and slowly ramped them up to about 1700 rpm range. I also adjusted the percentage tables to about 1-2% in the lower rpm range and slowly ramped them up. I'll get the computer out tmoro and look at what else I adjusted and post the rest tmoro night.

Hopefully you are talking about 6.4 lol

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CT9AIX

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I thought I was going to have time this weekend to play around with this, but the wife is pregnant and due in 6 days and has been having fake contractions all weekend. Lol needless to say I've been awake for just about the past 48hrs trying to figure out if she's going into labor or not! Hopefully things will be back to normal soon and I can start to try and figure this out again
 

7.3powerstroke00

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I think these are all the tables i adjusted and how...

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CT9AIX

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Yeah those are the same ones I adjusted as well. I'll be back to playing with the truck hopefully this weekend and will try it again. I'm starting to wonder if my EBP sensors is screwy. I know when my I was not running a Wastegate, my EBP tube would freeze sometimes and the VGT would react super slowly kinda like it does at idle now. I have a spare sensor that I might try throwing in and see if it changes anything
 

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