Guide vane position and turbo noise questions - Chevy Colorado & GMC Canyon
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post #1 of 84 (permalink) Old 01-11-2017, 10:52 AM Thread Starter
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Guide vane position and turbo noise questions

I am trying to find a suspected leak as I have some additional turbo noise that I didn't have before. But around the same time I installed a tune and haven't been able to return to stock yet (new to the Spade (autocal) and the directions provided doesn't include a way to return to stock. I've requested the stock file from the tuner as well as my purchased tunes (as I'll need those later to modify when I delete).

In my reading of this forum yesterday I read something about a "whislter" tune and wondered if that could have been possibly implemented into my tunes and is causing the sound. I would be fine with this as I am only concerned if there is a leak.

Here is some videos of what I am experiencing:

https://youtu.be/SlfrdZpvsKY

https://youtu.be/A46EVbusiTs

Here is a picture of the guide vane arm (I am assuming this is the arm and servo motor) position at idle: (I realize this is a crap picture with the shadow, but you can see the arm is "fully extended" if you will, meaning, looking from the front of the truck, it is in the furthest counter clock wise position it can go).




So here are my questions:

Does the guide vane position look like it is "open" creating the whistle that I am hearing in the videos?

I can here this on start ups too, it isn't just under load, so this leads me to think this is still a leak I am chasing.

I have pulled both the hot and cold side pipes post turbo and inspected them and didn't see any signs of leaks. I realize though that this sound could be from a very small leak.

Another thing I notice, on cold start up, I see signs of a very small leak were the "guide vane control arm" goes into the exhaust side, can anyone confirm if this is normal? Water drips out when it first starts up (condensation), also, you can see some small "exhaust marks, black" on the turbo housing.

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post #2 of 84 (permalink) Old 01-11-2017, 11:44 AM
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When I get mine back I'll check for the water marks. What kind of boost are u seeing? Would a datalog confirm if you are losing boost if you start to see a linear drop? I haven't played with the minimax yet.

I could see stuck vanes causing the sound and maybe not a leak. Have you checked the turbo for shaft play?

What can tell you... mine doesn't sound like that, my EcoBoost never sounded like that, my WRX didn't sound like that, etc. sounds more like a SC than a turbo.... which would make me want to check the shaft and bearings to make sure it was free turning. It sounds like you already checked all the clamps.

Last edited by 16_MidnightRider; 01-11-2017 at 11:50 AM.
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post #3 of 84 (permalink) Old 01-11-2017, 12:01 PM
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I know nothing about the VNT function but I know @hacklerjason knows a bit.

Any ideas, bro? Definitely not something I've heard before
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post #4 of 84 (permalink) Old 01-11-2017, 12:29 PM Thread Starter
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When I get mine back I'll check for the water marks. What kind of boost are u seeing? Would a datalog confirm if you are losing boost if you start to see a linear drop? I haven't played with the minimax yet.

I could see stuck vanes causing the sound and maybe not a leak. Have you checked the turbo for shaft play?

What can tell you... mine doesn't sound like that, my EcoBoost never sounded like that, my WRX didn't sound like that, etc. sounds more like a SC than a turbo.... which would make me want to check the shaft and bearings to make sure it was free turning. It sounds like you already checked all the clamps.

I haven't check shaft play yet, if I am unable to find a leak I was going to return to stock and take it to the dealer and have them look at it. It started making this noise at 300 miles. I will be installing my AFE air box soon and will check then (assuming I can see the turbo fins and shaft at that time.

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post #5 of 84 (permalink) Old 01-11-2017, 12:30 PM Thread Starter
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Originally Posted by lqdchkn View Post
I know nothing about the VNT function but I know @hacklerjason knows a bit.

Any ideas, bro? Definitely not something I've heard before
Yeah, I was kind of hoping @hacklerjason would chime in, seemed very knowledgeable about what I am asking.

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post #6 of 84 (permalink) Old 01-11-2017, 12:41 PM
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Originally Posted by mrpositraction View Post
Yeah, I was kind of hoping @hacklerjason would chime in, seemed very knowledgeable about what I am asking.
Give me a little bit to get to work and I'll come back... Get me turbo desired vane position at idle please, while running...


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post #7 of 84 (permalink) Old 01-11-2017, 12:45 PM Thread Starter
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Originally Posted by hacklerjason View Post
Give me a little bit to get to work and I'll come back... Get me turbo desired vane position at idle please, while running...


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I'll work on getting that, I am very new to EFI Live and Autocal and learning so I am likely a little slower at getting this stuff. Have been a Ford guy and SCT user for years and have that stuff pretty well figured out.

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post #8 of 84 (permalink) Old 01-11-2017, 12:52 PM
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Originally Posted by mrpositraction View Post
I'll work on getting that, I am very new to EFI Live and Autocal and learning so I am likely a little slower at getting this stuff. Have been a Ford guy and SCT user for years and have that stuff pretty well figured out.
We just have to determine if it's making noise by design or flaw...

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post #9 of 84 (permalink) Old 01-11-2017, 01:07 PM
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I watched your videos... How much boost is indicated by your scan tool?

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post #10 of 84 (permalink) Old 01-11-2017, 01:21 PM
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I will say that don't sound normal.. can I see a pic of the intake

When did you first notice the noise and what was done just prior?
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Last edited by hacklerjason; 01-11-2017 at 01:46 PM.
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post #11 of 84 (permalink) Old 01-11-2017, 01:42 PM
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Here is what mine sounds like... Nothing like yours and I have what I consider to be a large intake
https://youtu.be/13voHN2wDk4

Also... When you idle and then key off... Do you hear the arm cycling end to end for about 2 seconds then stop?

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post #12 of 84 (permalink) Old 01-11-2017, 03:11 PM Thread Starter
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Originally Posted by hacklerjason View Post
Give me a little bit to get to work and I'll come back... Get me turbo desired vane position at idle please, while running...


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Desired at idle is 100%

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post #13 of 84 (permalink) Old 01-11-2017, 03:21 PM
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That doesn't sound normal sounds kinda like a bearing noise I could be wrong.Mine is tuned and doesn't sound like that it could be the tuning you have thats weird.
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post #14 of 84 (permalink) Old 01-11-2017, 03:26 PM
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Quote:
Originally Posted by hacklerjason View Post
Here is what mine sounds like... Nothing like yours and I have what I consider to be a large intake
https://youtu.be/13voHN2wDk4

Also... When you idle and then key off... Do you hear the arm cycling end to end for about 2 seconds then stop?

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That's how mine sounds at idle minus the intake I was thinking about getting one for the mini max how do you like it and is yours oiled or is it the pro dry filter.
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post #15 of 84 (permalink) Old 01-11-2017, 03:31 PM
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Originally Posted by Duramax_canyon View Post
That doesn't sound normal sounds kinda like a bearing noise I could be wrong.Mine is tuned and doesn't sound like that it could be the tuning you have thats weird.
It does sound like something in the CHRA... That's a whining sound and not a spooling sound... Could be bearing, wheel touching the housing because the bearing went... Just speculating right now, need more details

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Last edited by hacklerjason; 01-11-2017 at 03:35 PM.
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post #16 of 84 (permalink) Old 01-11-2017, 03:32 PM
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Originally Posted by Duramax_canyon View Post
That's how mine sounds at idle minus the intake I was thinking about getting one for the mini max how do you like it and is yours oiled or is it the pro dry filter.
It's the pro dry s... I never liked oiled filters... I've gone through too many mafs with older K&N 77 series intakes

I do like it! At WOT you can really hear the turbo

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Last edited by hacklerjason; 01-11-2017 at 03:38 PM.
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post #17 of 84 (permalink) Old 01-11-2017, 03:34 PM
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Originally Posted by mrpositraction View Post
Desired at idle is 100%
And that is ok if you are going for a whistling tune... Can you make a datalog of a short drive

Record desired vane position, actual vane position, engine speed, throttle positon, and manifold absolute pressure please...

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post #18 of 84 (permalink) Old 01-11-2017, 03:37 PM Thread Starter
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I watched your videos... How much boost is indicated by your scan tool?

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Wasn't able to determine this, after getting the guide vane desired it would no longer data log. Looks like I need to update firmware on the device but waiting for my stock file from the tuner. I'll get my stuff updated and retry.

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post #19 of 84 (permalink) Old 01-11-2017, 03:38 PM Thread Starter
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I will say that don't sound normal.. can I see a pic of the intake

When did you first notice the noise and what was done just prior?
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I noticed it around 300 miles. Right after I installed the tune, probably within 40 miles, but I think that is coincidence to be honest. I have nothing else done to the truck.

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post #20 of 84 (permalink) Old 01-11-2017, 03:39 PM
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Originally Posted by mrpositraction View Post
Desired at idle is 100%
What about while you drive around? Is it pegged at 100% all day? I need that recording I requested in my post to help further

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