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Discussion Starter #1
i know our truck dont have these, but is there a conversion kit we could run.
 

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bd power makes one but it is not cheap , $650 . unless you are running a big hp tune most likely you wont need one .
 

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bd power makes one but it is not cheap , $650 . unless you are running a big hp tune most likely you wont need one .
OK, stupid question here.
What is the difference betwen a blow-off valve and a wastegate?
 

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wastegate controls the amount of boost the turbo will build to ,(some are adjustable) , a blow off lets that pressure off the system as soon as you let off the throttle, thus you dont have @ 35 lbs of boost with no where to go but back on the turbine impeller thus creating ,whats known as turbo bark, which is bad on the turbo
 

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OK, stupid question here.
What is the difference betwen a blow-off valve and a wastegate?
Plus they are on opposite sides of the turbo. Wastegate diverts exhaust gasses to control drive to the compressor. Blowoff is on the compressor side to blow off excess boost to the engine when load is suddenly decreased.
 

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exactly what CAP and idle chatter said
 

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nope, 75+ sled hooks and 35 drag strip passes with the aurora and stock studs.
 

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makes ya feel al warm and fuzzy now BEN , dosent it !!!!!!!!!:hug: :chevy: :drop_mout
 

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with big turbos and high boost the immediate let off the compressor wheel will fight the air in the system and bark the turbo , usually the higher the boost the more likely the need for one , they are big in the pulling circuit, as they have lots of immediate let offs, you can feather off the pedal with out a bark but they do help
 

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do the lb7's have a BOV? if not, why not?


at what point is a BOV needed on a duramax?
None of them have one - it's an aftermarket add-on. Stock LB7s have a pressure-actuated wastegate and rarely bark. The stock LLYs have the VNT turbo and you can hear most of them bark on some of the pulling video clips here on the Place. Just as they stop the pull and chop the throttle. (Makes a strange "whoop-whoop-whoop" sound). Like CAP said, only a problem in certain special situations - made worse if you've got a big turbo on there and pushing big boost.
 

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Mine barks on TC lock up at 30/32 LBS of boost that I backed down from 40 that would bark the shifts.I aint got Ryan's :eek:

Or a turbo :)
 

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why do they chop the throttle like they do?
Well, you're pulling a sled with every ounce of power your truck can develop until it just can't pull any more. At that point stress has been building and has reached a maximum deadlocked against the weight of the sled. If it's stopped moving, you want to relieve that stress as quickly as possible before something in the engine and driveline snaps! No time to feather it down.
 
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