Lets talk wastegates.....

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Dec 30, 2011 | 09:10 AM

#16

Kert0307

Senior User

Joined: Nov 2010

Posts: 419

Likes: 1

From: Iowa

Mine's still running fine with plenty of miles on the trans... I like it's features over others on the market. I feel a lot safer with the ability to defuel it automatically on a non studded truck than an "alarm" like everyone else.

Dec 30, 2011 | 10:19 AM

#17

SteveBricks

FTE Leadership Emeritus

Joined: Aug 2007

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From: Lakewood, Ca.

Quote:

Originally Posted by bodabdan

My most apparent options are either a wastegate on the exhaust side, or a BOV on the intake side to control the maximum boost regardless of what the variable geometry does.

A blow-off valve has no application on a diesel. Strictly a gasser thing, since they're actuated according to the pressure differential on either side of the throttle plates.

Dec 30, 2011 | 12:50 PM

#18

69cj

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Joined: Jul 2005

Posts: 13,834

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From: Middle Tn.

Quote:

Originally Posted by Kert0307

Your truck, not mine. Good luck to you.

Dec 30, 2011 | 05:15 PM

#19

bodabdan

Thread Starter

Fleet Mechanic

Joined: Feb 2004

Posts: 1,816

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From: River Valley AR

Although I honestly appreciate the input from everyone, I have found it very difficult to even mention the Edge without the thread turning into what a poor product the Edge is. I am very comfortable with the performance that the Edge has given me, and it is an essential part of the nicest truck I have ever owned.

So let's assume for discussion purposes that I have an SCTDIABLOBULLYDOGXGUAGEZILLA2000 and my boost is running higher than I want it to. I have seen safety valves of every style and configuration over the years, and I find it hard to believe that someone can't install a BOV that is referenced to atmospheric pressure so that it can be set to a certain PSIA. Yes it is a diesel and not a gasser, but then again it is also a pipe with more pressure in it than desired.
I feel a quest coming on.........

Dec 30, 2011 | 05:33 PM

#20

bpounds

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Joined: Aug 2006

Posts: 17,398

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From: Whittier, CA

Okay, you're aware of the community opinion of Edge. So let's play what-if.

Lets say you build a blow-off valve. In its simplest form that is simply a spring loaded flapper valve. The elbow into the intake manifold appears to be a very convenient place to build something up.

Now, your PCM is monitoring the boost, and varying the turbo geometry to make a programmed level of pressure. Your Edge is intercepting the sensor input, and reporting to the PCM that you only have =xx amount of boost, when you really have +xx. I think that is how the Juice works anyway. I don't think it uploads any changes to the PCM.

So, when your PCM/Edge commands 30psi, but it is only seeing a maximum of 26psi (or whatever your blow-off setpoint), what is going to happen?

Dec 30, 2011 | 05:53 PM

#21

bodabdan

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Fleet Mechanic

Joined: Feb 2004

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From: River Valley AR

Quote:

Originally Posted by bpounds

I can't say for sure, but I would guess that the PCM will continue to drive the VGT to reach the desired setpoint. If it can't reach that setpoint it will send the VGT to the maximum setting (if it's not already there). This may or may not cause a DTC, but my goal of not lifting the heads will be met mechanically, not electronically. I think that worst case it will throw a DTC, but as I mentioned before, it's just a guess.

Dec 30, 2011 | 06:14 PM

#22

High Binder

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Joined: Sep 2009

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Quote:

Originally Posted by bodabdan

I find it hard to believe that someone can't install a BOV that is referenced to atmospheric pressure .

I said it before, you can do it and it would be pretty easy/cheap to do... There's just no need for the reasons others here have outlined.

Dec 30, 2011 | 06:22 PM

#23

dchamberlain

Lead Driver

Joined: Sep 2007

Posts: 8,180

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From: Scio, OR

Quote:

Originally Posted by bodabdan

So let's assume for discussion purposes that I have an SCTDIABLOBULLYDOGXGUAGEZILLA2000 and my boost is running higher than I want it to.

Your SCTDIABLOBULLYDOGXGUAGEZILLA2000 is either broken, really poorly designed or whoever wrote the tunes for it screwed up. Get it fixed, re-tuned or replace it, so that the PCM can control the engine the way it was designed and within the parameters for which it was designed.

Sorry, I couldn't help myself.