Waste gate

Hoss 350

My GSP, Dutch
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black_cloud_stroker00 said:
mine doesn't do it when I shift. just when its at higher boost.
You are getting confused, which is very common with these issues. The fluttering noise you are hearing is NOT your wastegate. The fluttering noise is TURBO SURGE. You will never hear your wastegate. It does not make any noise.

YOu said it cannot be surge because it doesn't happen at shifts. Two different, distinct things. At shifts, you hear turbo STALL, not SURGE. Turbo surge happens at sustained high boost levels (usually in the 7-15 psi range) at 3.4 to full throttle. It is a stuttering, fluttering pst pst pst pst sound just like you described. It happens because the boost map of the turbocharger no longer fits the fuel curve of the engine once you chip or modify. It is an oscillation caused by the boost pressure overcoming the drive pressure, and causing air to "backwash" out of the turbo.

As was stated in the first post, to fix the problem, you need to install a wicked wheel or an ats housing (each of these re-map the boost curve of the turbo in such a manner as to hadle the new fuel curves in the chipped engine.)

Do not disconnect your wastegate. It won't accomplish anything besides maybe lowering your fuel economy a little bit, and it certainly won't help with surge.

Just so you know, every time you hear that surge sound, you are slowly destroying your turbocharger, so either don't let it do it (downshift, let up off the throttle, etc) or get it fixed.

The STALL you referenced as being the sound "at shifts" has nothing to do witht he discussion.


we I get a chance I will uplug the wastegate and see what happens.
Don't waste your time. It won't fix it, as the wastegate is totally unrelated to what is happening and the sound you are hearing.

Bottom line, is it bad to unplug the wastegate?
No, but it really doesn't do much to do so other than lower fuel economy in my case, so why do it? The wastegate is there to control exhaust backpressure to boost ratios. Unplug it, you can get more boost, but you get so much higher exhaust backpressures that you end up wasting your time. Add the higher backpressures and similar power levels fighting against it together, and all you get is no apparent gain, bigger boost numbers on your gauges, and lower fuel economy to do the same job you were doing before. Just MHO....
 

black_cloud_stroker00

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Thank you for that explantion HOSS. That must have taken some time. Part of my 'PMS' is to buy a new Turbo. I'm leaning towards the High-Tech or the Turbonetics. Hoping to pick one up in the spring. Will that fix the problem?
 

CSIPSD

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Yes it will, but both turbos are the same... So pick the one you get the best deal on... Or the GTP-38r
 

seanyounk

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Question

I bought a 99 F250 Superduty PSD with 130K miles last winter and had stacked Edge with Attitude, AFE intake, and full stainless exhaust (no muffler) all put in rite away.

I also had the ATS turbo housing put on it. I immediately noticed an awfull noise when I mash the throttle and it shifts. It sounds like a tremendous amount of pressure or some type of surge on the turbo. In fact it was not long before I blew out the seal in my turbo and had to replace the whole thing (for $750.00 not $3,000). The problem still continues and I am certain I will be replacing the turbo again unless I choose to stop mashing on the throttle. I had it built so I could drive it hard. How do I correct this problem? Yeah I know, stop romping on it, but I also pull a toy hauler and it does this when it shifts on hills as well.
 

Hoss 350

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seanyounk said:
Question

I bought a 99 F250 Superduty PSD with 130K miles last winter and had stacked Edge with Attitude, AFE intake, and full stainless exhaust (no muffler) all put in rite away.

I also had the ATS turbo housing put on it. I immediately noticed an awfull noise when I mash the throttle and it shifts. It sounds like a tremendous amount of pressure or some type of surge on the turbo. In fact it was not long before I blew out the seal in my turbo and had to replace the whole thing (for $750.00 not $3,000). The problem still continues and I am certain I will be replacing the turbo again unless I choose to stop mashing on the throttle. I had it built so I could drive it hard. How do I correct this problem? Yeah I know, stop romping on it, but I also pull a toy hauler and it does this when it shifts on hills as well.
What you are describing is turbo stall. It is normal, and it is not what blew out your seal (totally unrelated). Don't worry about it, keep mashing on it, you're not hurting a thing.

Just so you know, the noise you are hearing is boost backwashing out the intake when you let off the throttle or the tranny shifts. No more drive pressure, turbo stops compressing, and so the compressed air left in the intake equalizes with ambient by blowing back out the intake. Turbos do this, it is part of their makeup. There is no way to avoid it. Gasser turbos have a blow off valve to release this pressure, because the throttle plate won't let it release. Diesels don't have throttle plates, so they don't need BOV's, and the pressure just backwashes out.

So, the moral is, on't worry about it. It is a cool noise. Enjoy it, don't fear it!
 

dboyw

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The best way is to ajust the wastegate to where is vents at 22-24#, You will do no harm in doing this.

Can you adjust the stock one? If so, how?

Thanks
 

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