turbo stall explanation please
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Freshman User
Joined: Sep 2005
Posts: 46
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From: Houston Texas
turbo stall explanation please
Ok after the installation of the napa 6637 and the 4 in. MBRP exaust I am getting the feeling and sound of the turbo either fluttering or stalling on hard acceleration. It happens on stock mode and on tow mode. I remember reading about the wicked wheel helping the situation, but would appreciate if someone could explain exactly what is happening. I understand that I am drawing more air and have less back pressure,but dont understand , is the compressor wheel turning too fast or not fast enought or just what.
I dont need this when running from these hurricanes. Appreciate all the help and good info. you guys have sent my way.
I dont need this when running from these hurricanes. Appreciate all the help and good info. you guys have sent my way.
Elder User
Joined: Aug 2005
Posts: 763
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From: Dallas, Texas
Let's see.....
The turbo is pushing air into the heads.
The valves are opening and closing.
When the intake valve closes, the pressurized air "stacks" up.
Multiply that times the number of intake valves that are closed at any one time and the air has no where to go but back out of the runner, throught the compressor and out the air cleaner. That would be the flutter that you hear. Is it bad, well yes and no. Running stock or neglegable amounts of boost won't do much harm. When you get into the big boost it can become a big problem. The shaft that connects the turbine to the compressor goes through enormous stress. Two different forces opposing eachother (exhaust pressure/boost ramp) can cause the shaft to flex, crack, etc. The Compressor wheel and or turbine can come into contact with the respective housings and things just go wrong at that point.
The turbo is pushing air into the heads.
The valves are opening and closing.
When the intake valve closes, the pressurized air "stacks" up.
Multiply that times the number of intake valves that are closed at any one time and the air has no where to go but back out of the runner, throught the compressor and out the air cleaner. That would be the flutter that you hear. Is it bad, well yes and no. Running stock or neglegable amounts of boost won't do much harm. When you get into the big boost it can become a big problem. The shaft that connects the turbine to the compressor goes through enormous stress. Two different forces opposing eachother (exhaust pressure/boost ramp) can cause the shaft to flex, crack, etc. The Compressor wheel and or turbine can come into contact with the respective housings and things just go wrong at that point.
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Freshman User
Joined: Sep 2005
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From: Houston Texas
ok If I understand i am producing too much air or boost and is it the same and what is the proper way too correct it and will it do it on a hard uphill pull with my 5th wheel. i hear about the ww wheel helping to a certain extent but what is the best way to go and why? thanks
Postmaster
Joined: Sep 2004
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From: Bellingham, WA
I just had the wicked wheel put on and have run up to 85hp on my predator and I can not get it to stall at all. And oh man does it sound good. Kwik has a sound clip on here somewhere. From the research that I did there is no other way to make it go away and the WW is the cheapest and most efficient fix. (either that or never hold the pedal to the floor!!!)
Fleet Owner
Joined: Jun 2004
Posts: 25,090
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From: Rio Rico, AZ.
Elder User
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From: Dallas, Texas
You are not producing "too much". I have a friend, who also is our head technician (engine builder) that went to Garrett for training. I am being told that the stalling, or back up of air cannot destroy a turbo. There has not been any documented proof that the turbo incurs any dammage even after long periods of time. - THIS IS WHERE YOU START YOUR ATTACK FTE-
I respect the information provided here, I also respect the word of qualified technicians. It's the balancing of the two that I find hard.
The damage is caused by poor lubrication, and or high EGT's. Nothing else...is what I am being told. I asked if he could bring in his workbooks so I could examine them. When I get them, I will post what I can without getting intimate with a lawyer.
I respect the information provided here, I also respect the word of qualified technicians. It's the balancing of the two that I find hard.
The damage is caused by poor lubrication, and or high EGT's. Nothing else...is what I am being told. I asked if he could bring in his workbooks so I could examine them. When I get them, I will post what I can without getting intimate with a lawyer.
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Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
I agree with you BuickTurbo. Maybe after years of running in a stalling situation you MIGHT get some cavitation on the house and/or blades. It sure sounds terrible when it happens though.
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Fleet Owner
Joined: Jun 2004
Posts: 25,090
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From: Rio Rico, AZ.
Originally Posted by BuickTurbo
Kwik, you should hear the Buicks when you let off the throttle. They scream at you. Sounds like a short burst from an airhorn.
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