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Power Strokes
6.4 Aftermarket
Resurrecting a pile of crap.
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[QUOTE="Tree Trimmer, post: 870350, member: 716"] when i let off, i can, at will, get it to do the slow "sh-uh sh-uh sh-uh" sound. i was told that that sound is bad, as its the wheel stalling out and then spinning again. hard on the shaft. its the air trapped by the compressor wheel coming out backwards through the turbo. if i'm stuck or getting stuck, and i'm floor board deep and have to let off to throw it in reverse, it will sound just like a pulling truck at the end of the track. think the same sound, just real fast and real loud. if you been to a truck pull, you will know the sound. the over speed, this is the way it was explained to me. its a sound, when your again floor board deep and sometimes when you let off, sometimes when your just floor board deep. its a straight zzzzZZZZZZZzzzz. think when a flies buzzing around your ear, but loud as fk. its also a sound like one of the wheels is hitting one of the covers. but i have no contact. i was told that when you get to boost levels higher than a particular turbo should run at, and/or shaft speeds faster than a particular should spin it can create a "pocket of stale air" around the compressor wheel. it's trying like hell to shove air in and there is simply no room left for it, so it starts coming back out, bleeding around the wheels etc etc. when this happens it allows the wheels to "free spin" and over speed. i was also told that that is one of the worst conditions for a turbo to be in as well. there is probably more to it, but i didnt need a scientific explanation on specifics, i just needed to understand what was going on, to better help myself to not let specific conditions happen in the future, till i get my gate, bov, and larger turbo's in the future. [/QUOTE]
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Resurrecting a pile of crap.
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