wastegate? - Diesel Bombers



Chevy/GMC 6.2L and 6.5L Discussion of Chevy and GMC Trucks with 6.2L and 6.5L Diesel Engines

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  #1  
Old 10-12-2011, 05:20 PM
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Default wastegate?

I was just surfing the web and saw that people were unplugging the vacuum line going to the wastegate. What exactly does this do and is it safe for your engine?
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Old 10-12-2011, 05:47 PM
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Default Re: wastegate?

They do it for more boost,it keeps the waste gate closed.
It will increase the drive pressure not a good thing or if a stock turbo work it to hard a break the shaft.

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Old 10-12-2011, 09:26 PM
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Backwards. If you unplug the line you will have no turbo. They use vacuum to close the waste gate on the 6.5. It wont hurt anything but the the truck will smoke like a trash fire and have the power of a moped.
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Old 10-12-2011, 09:40 PM
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what?... it cant work on vaccume if its under pressure!

lets say your wasegate is set at 15psi until your intake manifold reaches 16psi the gate stayes closed. vaccum has NOTHING to do with a wastegate. by -unplugging- it you eccentially delete your wastegate and drive pressures will be higher because the wastegate -hole in the turbo- wont ever open to let excess pressures out thus making your boost numbers go up. a boost regulator would be a better chose because you could fine tune your wastegate. trick it to boost to 20 before it released excess pressures. hope that helps
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Old 10-12-2011, 10:19 PM
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It has a vacuum pump on the front of the engine and uses a waste gate solenoid on the driver side of the engine to hold it shut until it reaches a certain amount of boost. The best thing you can do is get rid of it all together and go with a spring controlled wastegate.

---AutoMerged DoublePost---

You are in chevy 6.5 world now everything is backwards. They don't open the wastegate with vacuum they hold it shut. The turbos on these things are lucky to reach 15psi. Factory is only 8psi and if you get past 20psi you better be carrying spare parts with you.

Last edited by 2MuchJunk; 10-12-2011 at 10:19 PM. Reason: Automerged Doublepost
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Old 10-12-2011, 11:28 PM
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Quote:
Originally Posted by turbo2332 View Post
what?... it cant work on vaccume if its under pressure!

lets say your wasegate is set at 15psi until your intake manifold reaches 16psi the gate stayes closed. vaccum has NOTHING to do with a wastegate. by -unplugging- it you eccentially delete your wastegate and drive pressures will be higher because the wastegate -hole in the turbo- wont ever open to let excess pressures out thus making your boost numbers go up. a boost regulator would be a better chose because you could fine tune your wastegate. trick it to boost to 20 before it released excess pressures. hope that helps

Thanks I did not know they worked that way.
Darryl
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Old 10-12-2011, 11:37 PM
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i understand your argument. silly to have all the B.S. on there, when there is no need. and i figured your guys psi was lower i was just throwing numbers out there. lived another day-learned something new-success
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Old 10-18-2011, 04:29 PM
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it'll just make your truck smoke, and smoke from a 6.5= unhappy engine
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Old 10-19-2011, 04:55 PM
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NO SACK with no vaccum.get a boost controller from heath. worth every penny
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Old 07-11-2012, 08:00 PM
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Default vacuum question

ok I am new here. Previous diesel 6.2 cucv m1009 sold it and now own a 6.5td 2500 chevy

here is the question I have after replacing the vacuum pump I still had no boost so I bypassed the waste gate selinoid and ran the vacuum straight to the waste gate controler. now I have boost but I think way too much. I am getting around 7lb of boost cruising at 65 ish and if i step on it it will hit 15 which i know is bad!
help new to the turbo and what numbers do i want to stay with in
Jon
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