VGT anti scream switch - Ford Powerstroke Diesel Forum
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post #1 of 12 Old 07-03-2013, 03:13 PM Thread Starter
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VGT anti scream switch

** THIS IS NOT A SMOKE SWITCH THREAD**

This isn't so much of a problem as it is a how to. As the name insinuates, I have a 2003 and it screams pretty loud. Loud enough that I have been getting negative attention from the gate guards at work.

As I understand, defeating the VGT will eliminate the screaming at idle. This would be useful as it would make the gate guards happy. There appears to be two wires, which one would I interrupt? Would I simply wire in a switch that keeps the circuit open for normal operation (ON) then breaks the circuit to defeat the VGT (OFF)?

If you can't tell, my electrical skills are such that I ask before doing the simplest of tasks.

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post #2 of 12 Old 07-04-2013, 10:48 AM
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i wouldnt alter my truck to appease gate guards.

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post #3 of 12 Old 07-04-2013, 10:51 AM
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Quote:
Originally Posted by powerstrokeshellback View Post
i wouldnt alter my truck to appease gate guards.
I agree.



Also, what could the negative side effects be from doing this to your truck?


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post #4 of 12 Old 07-04-2013, 11:03 AM
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If you are military, they have zero reason to be giving you any negative attention over the scream of the '03 whistle. Its like that stock, they can get over it.

Now for the negative, anything you do to have a cutout so to speak is going to have points of failure, which could cause a lot worse damage to the truck than annoying the gaurds.

Lets say you do this electronically, without a butterfly valve, just altering the VGT cycle. Most likely you'd create a overboost condition, or an excessive backpressure condition. Overboost, of course could cause a number of issues (boost leaks, boots blowing off, etc.). High exhaust pressure, and you could lift the exhaust valves enough to strike the pistons (same as a jake brake can).

I wouldn't alter this in the manner you are proposing. At any time you hit that switch by mistake, say on the interstate or when towing, and its hard to say how much damage you'd cause.

The only thing I know to deaden that whistle is a restrictive cat, and muffler. Your other option is swap to a later turbo, and have tunes written out to cover it.
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post #5 of 12 Old 07-04-2013, 11:38 AM
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I would never alter my truck with possible damage to appease anyone especially if its stock

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post #6 of 12 Old 07-04-2013, 02:10 PM
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I have a "smoke switch" on my truck. I have used it a lot, not to smoke but to quiet the truck when I need to. I used a relay and an upfitter switch. Doesn't matter which wire you use. My worked perfect until my 03 turbo install.

Which brings me to this question are you sure you have a vgt turbo. The idea of the 03 turbo is that it isn't electronically controlled.

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post #7 of 12 Old 07-04-2013, 02:12 PM
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I have a good condition 06 turbo I'll trade you that would be quieter if you'd like.







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post #8 of 12 Old 07-04-2013, 02:16 PM
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I would probably pull mine down into fist gear and really let them hear my straight pipe scream. Stupid guards.

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post #9 of 12 Old 07-04-2013, 02:17 PM
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Not a good idea. This is a pcm output.


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post #10 of 12 Old 07-04-2013, 02:27 PM
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Funny a lot of people want to go the other way just to get back that kool turbo whistle.
They buy a 03 and refurbish it and install on the newer trucks.


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