Turbo..I think
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Turbo..I think
My 2001 7.3 is making a noise when you get after it and then back off just a little bit ...sounds like a scraping noise .... just had a a cold air intake added to it and a 5 inch exhaust system....i'm wondering if the bearings in the turbo could be going out
Hotshot
Joined: Dec 2006
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From: Melbourne, Ky
Dittos on the other 2 posts. It's natural. Mine does it too. It makes a scraping sound. Nothing to worry about. Don't know exactly what causes that sound, but someone on here could probably answer that question.
Postmaster
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same noise mine made when i did the open element intake, almost chitttt myself thinking somethings broken, then found out its normal!!
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Hotshot
Joined: Dec 2006
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From: Melbourne, Ky
I'm sure someone out there will correct me, but my guess, and it's only a guess, is what is happening is that boost is being built up under a load, and when the tranny shifts, the rpm's drop, and the turbo can't hold the boost built up and as a result, it backs up through the turbo. I would also assume it only happens with trucks with automatic trannys. Am I right, or am I lost?
Post Fiend
Joined: Jun 2004
Posts: 9,293
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From: Parker, CO
The "Darth Vader" exhale and the scraping sound are two different things.
The scraping sound that the OP is describing is when you have higher boost levels, then suddenly let off the pedal completely. This is when the turbo gets a really quick compressor stall, harsher than you get on an upshift. The stock turbo makes this noise, as well as the 38R. It is normal to hear it on both of those Garretts.
The scraping sound that the OP is describing is when you have higher boost levels, then suddenly let off the pedal completely. This is when the turbo gets a really quick compressor stall, harsher than you get on an upshift. The stock turbo makes this noise, as well as the 38R. It is normal to hear it on both of those Garretts.
Hotshot
Joined: Jul 2003
Posts: 12,177
Likes: 40
From: Newport, WA
The "Darth Vader" exhale and the scraping sound are two different things.
The scraping sound that the OP is describing is when you have higher boost levels, then suddenly let off the pedal completely. This is when the turbo gets a really quick compressor stall, harsher than you get on an upshift. The stock turbo makes this noise, as well as the 38R. It is normal to hear it on both of those Garretts.
The scraping sound that the OP is describing is when you have higher boost levels, then suddenly let off the pedal completely. This is when the turbo gets a really quick compressor stall, harsher than you get on an upshift. The stock turbo makes this noise, as well as the 38R. It is normal to hear it on both of those Garretts.
Tuned
Joined: Nov 2004
Posts: 444
Likes: 1
From: Nelson, BC, Canada
Turbo stall. When the turbo is pressurizing the intake system, there is A LOT of air moving. If you are gunning it and then let off the pedal, all of a sudden the engine doesn't need all that air and the pressure wave routes back through the intake system to the turbo and starts to stall it. When it's spinning at 90,000 - 100,000 rpm and gets hit with a breaking pressure wave, the turbo talks back a little. The problem with this is as you stall the turbo, you have to wait for it to spool back up to give you some PSI again. In comes a blow off valve. On gassers, the blow off valve relieves the pressure in the pressurized intake tubes to help dissipate the pressure wave and reduce turbo stall.
I ran my twin turbo 5.0 without blow off valves and it does sound cool when the turbos break so quickly, but you gotta know it's putting unecessary pressures on parts. I installed blow offs on my TT 5.o and what a difference, under heavy foot manual shifts, I don't loose too many RPM's in the turbos as the pressure wave doesn't break the turbos.
I ran my twin turbo 5.0 without blow off valves and it does sound cool when the turbos break so quickly, but you gotta know it's putting unecessary pressures on parts. I installed blow offs on my TT 5.o and what a difference, under heavy foot manual shifts, I don't loose too many RPM's in the turbos as the pressure wave doesn't break the turbos.