turbo boost chatter
11-02-2009, 04:56 PM
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turbo boost chatter
Hi all, new to this forum. Plenty of useful information here.
I have a 1989 3/4 ton 4x4 5 speed manual trans. I recently bought.
The truck runs good but when its under a good load in 5th gear and the boost hits 15 the gauge chatters and I hear the turbo chatter as well. When I'm just blowing out the cob webs so to speak, the boost hits 35 with no problems. Any idea's?
I would like to pull a horse trailer but I'm a little apprehensive due to the boost issue.
Thanks!
I have a 1989 3/4 ton 4x4 5 speed manual trans. I recently bought.
The truck runs good but when its under a good load in 5th gear and the boost hits 15 the gauge chatters and I hear the turbo chatter as well. When I'm just blowing out the cob webs so to speak, the boost hits 35 with no problems. Any idea's?
I would like to pull a horse trailer but I'm a little apprehensive due to the boost issue.
Thanks!
11-02-2009, 05:43 PM
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its because you have no mwe slot any truck with excessive fuel or in your case a load on it will do it. like recamended above a gds kit will solve the problem cause there kits have mwe slots. or an hx35 will be a good step up from your baby h1c and they also have a mwe slot.
11-02-2009, 07:04 PM
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Hi all, new to this forum. Plenty of useful information here.
I have a 1989 3/4 ton 4x4 5 speed manual trans. I recently bought.
The truck runs good but when its under a good load in 5th gear and the boost hits 15 the gauge chatters and I hear the turbo chatter as well. When I'm just blowing out the cob webs so to speak, the boost hits 35 with no problems. Any idea's?
I would like to pull a horse trailer but I'm a little apprehensive due to the boost issue.
Thanks!
I have a 1989 3/4 ton 4x4 5 speed manual trans. I recently bought.
The truck runs good but when its under a good load in 5th gear and the boost hits 15 the gauge chatters and I hear the turbo chatter as well. When I'm just blowing out the cob webs so to speak, the boost hits 35 with no problems. Any idea's?
I would like to pull a horse trailer but I'm a little apprehensive due to the boost issue.
Thanks!
http://en.wikipedia.org/wiki/Wastega...e_chatter_myth
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11-02-2009, 07:43 PM
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11-02-2009, 09:26 PM
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straight from the wiki link:
There is confusion in the automotive world about so called "wastegate chatter" or "turbo flutter". A noise created on lifting off the throttle in a turbocharged car, commonly described as a chipmunk or a rattlesnake, is often stated incorrectly as being a result of the turbo's wastegate closing.
The noise is in fact the air compressed by the turbo passing back through the compressor wheel of the turbo after the airflow is abruptly halted by the throttle plate closing, called compressor surge. However, in some cases, i.e. where the throttle plate doesn't open fast enough or is set up to only react to high boost, some chatter will remain. Surge can occur on diesels when the turbo is attempting to pressurize the air at a higher pressure ratio than the compressor wheel can flow at a given speed. Diesel engines have no use for a blow off valve as they do not have a throttle plate.
The chatter noise is very noticeable on World Rally Cars, where anti-lag is used.
A compressor stall like this can cause excess stress and wear on the turbo's shaft or bearings under higher load applications of the turbo (around 15 psi (1.0 bar) and greater depending on the trim and flow rate of the compressor side).
Actual wastegate flutter occurs instead under partial boost conditions such as partial throttle near the boost threshold. It sounds like FftFftFft not ShuShuShu and is caused by the rapid opening and closing of the wastegate at boost levels near the spring pressure. It is commonly heard more clearly and may be more prominent on cars with modified intake silencers, up-pipes, and or downpipes, and is not harmful.
There is confusion in the automotive world about so called "wastegate chatter" or "turbo flutter". A noise created on lifting off the throttle in a turbocharged car, commonly described as a chipmunk or a rattlesnake, is often stated incorrectly as being a result of the turbo's wastegate closing.
The noise is in fact the air compressed by the turbo passing back through the compressor wheel of the turbo after the airflow is abruptly halted by the throttle plate closing, called compressor surge. However, in some cases, i.e. where the throttle plate doesn't open fast enough or is set up to only react to high boost, some chatter will remain. Surge can occur on diesels when the turbo is attempting to pressurize the air at a higher pressure ratio than the compressor wheel can flow at a given speed. Diesel engines have no use for a blow off valve as they do not have a throttle plate.
The chatter noise is very noticeable on World Rally Cars, where anti-lag is used.
A compressor stall like this can cause excess stress and wear on the turbo's shaft or bearings under higher load applications of the turbo (around 15 psi (1.0 bar) and greater depending on the trim and flow rate of the compressor side).
Actual wastegate flutter occurs instead under partial boost conditions such as partial throttle near the boost threshold. It sounds like FftFftFft not ShuShuShu and is caused by the rapid opening and closing of the wastegate at boost levels near the spring pressure. It is commonly heard more clearly and may be more prominent on cars with modified intake silencers, up-pipes, and or downpipes, and is not harmful.
11-03-2009, 06:09 PM
#11
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"Surge can occur on diesels when the turbo is attempting to pressurize the air at a higher pressure ratio than the compressor wheel can flow at a given speed"
That's exactly what you have going on. The fix is what several people have said, a compressor housing with a MWE slot.
That's exactly what you have going on. The fix is what several people have said, a compressor housing with a MWE slot.
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