Attention: TDR Forum Junkies I think I've figured it out, but lemme think out loud for a second. .
turbo is a stock 200k mile HX35w12 making 35lbs of boost... just got the truck last night...
today I noticed a loud "RING" noise when letting off at high boost... not sure if it was doing it last night or not because I wasn't driving the truck as agressively, but today I'm more comfortable with how the thing drives, and I've been hot rodding it a little. :-laf
the noise isn't turbo "barking"... I know what that sounds like... I've heard it at the track a number of times. this sounds more like someone rubbing their finger around the rim of a crystal wine glass...
now, I pulled the inlet hose off the turbo and inspected the play... a little wiggle... nothing out of the ordinary, but probably a little on the loose side... zero end play. BUT... I DID notice a few aluminum specks... looks like a spark plug on a nitrous injected gasser that's experienced some detonation (molten aluminum from the piston deposting on the plug electrode) nothing major... just a few specks...
AND, I inadvertantly flicked the compressor wheel with my fingernail and heard a very familiar "RING"
replicated the sound a number of times... I was surprised to hear that little compressor wheel ring like a friggin' bell!!
anyhow, my theory is when letting off at high boost, the shaft is deflecting causing the compressor wheel to contact the compressor housing ever so slightly, thus producing the "RING"ing (which is pretty loud through the 5" stacks!!
) and causing the aluminum dust to deposit itself on the housing...
sounds like I need to develop a different driving style till I can afford a B1, right?
:{
Forrest
turbo is a stock 200k mile HX35w12 making 35lbs of boost... just got the truck last night...
today I noticed a loud "RING" noise when letting off at high boost... not sure if it was doing it last night or not because I wasn't driving the truck as agressively, but today I'm more comfortable with how the thing drives, and I've been hot rodding it a little. :-laf
the noise isn't turbo "barking"... I know what that sounds like... I've heard it at the track a number of times. this sounds more like someone rubbing their finger around the rim of a crystal wine glass...
now, I pulled the inlet hose off the turbo and inspected the play... a little wiggle... nothing out of the ordinary, but probably a little on the loose side... zero end play. BUT... I DID notice a few aluminum specks... looks like a spark plug on a nitrous injected gasser that's experienced some detonation (molten aluminum from the piston deposting on the plug electrode) nothing major... just a few specks...
AND, I inadvertantly flicked the compressor wheel with my fingernail and heard a very familiar "RING"
replicated the sound a number of times... I was surprised to hear that little compressor wheel ring like a friggin' bell!!anyhow, my theory is when letting off at high boost, the shaft is deflecting causing the compressor wheel to contact the compressor housing ever so slightly, thus producing the "RING"ing (which is pretty loud through the 5" stacks!!
) and causing the aluminum dust to deposit itself on the housing... sounds like I need to develop a different driving style till I can afford a B1, right?
:{ Forrest
