is it safe??
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Senior User
Joined: May 2007
Posts: 241
Likes: 0
is it safe??
to disconnect my wastegate with the mods i have? disconnected it today and the truck runs like mad! thing feels like an airplane taking off. really dont want to blow stuff up though. ive done the search route and didnt come up with much, i know this has been covered but i just cant find it. thanx guys
Senior User
Joined: Jan 2009
Posts: 419
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The wastegate controls the amount of boost that your turbo puts out by metering the airflow through the exhaust portion of the turbo. Not only can this save your engine, it reduces the turbine speed of the turbo to make it survive longer.
Elder User
Joined: Oct 2007
Posts: 935
Likes: 1
From: Bowling Green, KY
I have mine disconnected right now and i am can see up to 33-34 pounds of boost. Thats not safe on a stock turbo. The stock turbo should only see about 25-27 and on occasion 30 but anything over 30 is just taking away from the life of the turbo. I have had mine disconnected for about 4 months and i seem to be getting better mileage with it unplugged
Cargo Master
Joined: Jan 2001
Posts: 2,726
Likes: 5
From: Slatington, PA
Gene must be tired. This is the shortest post I've ever seen from him!
The turbo really hates to see more then 25psi because it puts lots of stress on the bushings. The pressure ratio on a stock turbo is about 2:1, so when you see 25 psi of boost, your exhaust is seeing around 50. Unhooking it while stock is ok, but I'd personally hook it back up if I had a DP-Tuner.
The turbo really hates to see more then 25psi because it puts lots of stress on the bushings. The pressure ratio on a stock turbo is about 2:1, so when you see 25 psi of boost, your exhaust is seeing around 50. Unhooking it while stock is ok, but I'd personally hook it back up if I had a DP-Tuner.
Tuned
Joined: Oct 2003
Posts: 390
Likes: 0
From: Maine
I recently did some towing, and I usually plug in the wastegate while towing to prevent surge. I stopped for fuel, and reconnected it, and the truck had NO power. None. Could hardly make it up hills! Do you suppose the in-line valve crapped out? I had to stop and disconnect it again. I did try to go easy on it, however, after that.
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Senior User
Joined: May 2007
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yeah, ill check the numbers with it off, then ill put it back on and see the difference. sure does seem to have a ton of power with it off though. sure is fun.
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Fleet Owner
Joined: Jun 2004
Posts: 25,090
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From: Rio Rico, AZ.
I run with my wastegate connected, but with the control rod tightened up to where the WG will not open until the boost hits 12 psi.
For me it's a perfect combination of fast spool up and control from overboosting.
For me it's a perfect combination of fast spool up and control from overboosting.
Hotshot
Joined: Jul 2003
Posts: 12,177
Likes: 40
From: Newport, WA
Good point- my control rod is full tight adjusted.
Postmaster
Joined: Jun 2006
Posts: 2,647
Likes: 0
From: Fulltime RVer
Stock and Modded Boost Numbers... This thread is located at:
https://www.ford-trucks.com/forums/s...1&goto=newpost
I figure that by now many people know that if they search the 7.3L section using my username and a key word for almost any topic they'll find plenty of reading material!
BTW whatever became of the "Hippocratic oath"? I just cringe every time I read all the bad advise that's given out to members in this forum!
Postmaster
Joined: Jun 2006
Posts: 2,647
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From: Fulltime RVer
Not exactly because it's more complicated than that, but I've not seen any good data for a stock GTP38 turbo. However I have seen data for upgraded turbos and I'll pull together what data I've got and post it later, or maybe I'll wait until I finish the post I mention below!
Here's a "mouthful" from a post I'm preparing on turbos. I've come up with the term AFHP=Air Flow HP to define the "turbine shaft HP" that needs to be applied to the turbine wheel by the hot exhaust gas to power the compressor wheel to pull a given VAF=Volume Air Flow ft^3/min=cfm through the restriction of an air filter element, and then pressurize this ingested VAF, and push it through the restriction of an intercooler, and into the intake manifold to produce a given MAP=Manifold Air Pressure psi, which corresponds to a given BP=Boost Pressure psi, and then through the intake valves with a given VE=Volumetric Efficiency, and into the cylinders to produce a given CAP=Cylinder Air Pressure psi, where VE=(CAP)/(MAP)?
So would anyone like to offer up an estimate of the AFHP that's required to develop a 28 psi boost at sea level?
Here's a "mouthful" from a post I'm preparing on turbos. I've come up with the term AFHP=Air Flow HP to define the "turbine shaft HP" that needs to be applied to the turbine wheel by the hot exhaust gas to power the compressor wheel to pull a given VAF=Volume Air Flow ft^3/min=cfm through the restriction of an air filter element, and then pressurize this ingested VAF, and push it through the restriction of an intercooler, and into the intake manifold to produce a given MAP=Manifold Air Pressure psi, which corresponds to a given BP=Boost Pressure psi, and then through the intake valves with a given VE=Volumetric Efficiency, and into the cylinders to produce a given CAP=Cylinder Air Pressure psi, where VE=(CAP)/(MAP)?
So would anyone like to offer up an estimate of the AFHP that's required to develop a 28 psi boost at sea level?