stall question for tranny builders only!!
stall question for tranny builders only!! Have any of you heard of "blowing through a stall" i.e. slipping. Is it possible for a stall to "slip". I know if it unlocks it will jump 2-3 hundred rpm's. But can it "slip" and cause rpms to spike??
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My Favorite Subject Your actually not blowing thru the converter, or blowing over the converter, your just not going thru what is called the coupling phase (or in other terms "locking up" << Not talking about the lock-up clutch ).
In general, the coupling phase of any converter starts about 1700-2000 rpm's above the "SET" stall speed.
For example: Set stall speed at 5000 rpm's, The coupling phase wouldn't start until approx 6700 rpm's, Now the customer shifts at 6500. The tach would never fall back on a shift, it will stay pinned at the higher rpms, and the customer complaint would be: Blowing thru or over the converter.
When in reality the customer just needs to spin the engine faster or get the converter stall speed brought down to where it really needs to be.
This is a simplified version, the math model for fluid flow thru a vortex is crazy!!!!
Mike.
In general, the coupling phase of any converter starts about 1700-2000 rpm's above the "SET" stall speed.
For example: Set stall speed at 5000 rpm's, The coupling phase wouldn't start until approx 6700 rpm's, Now the customer shifts at 6500. The tach would never fall back on a shift, it will stay pinned at the higher rpms, and the customer complaint would be: Blowing thru or over the converter.
When in reality the customer just needs to spin the engine faster or get the converter stall speed brought down to where it really needs to be.
This is a simplified version, the math model for fluid flow thru a vortex is crazy!!!!
Mike.
Last edited by Vortech Converters; Sep 29, 2008 at 08:43 AM.
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"Blowing through the stall"
This happens when a converter is not matched to a particular engine combination such as an 8" converter behind a 706 C.I. motor. The converter will constantly slip and will not meet peak efficiency of 8% or less. Basically, a converter too small or stall too high for you engine, weight, gear combination. In simple terms making more power than the converter was designed to work with. With this being said a converter rated at 5500 stall behind a 355 C.I. motor with 500HP. When placed behind 540 C.I. making 900HP will stall 6800. This is providing the converter is in good working order. I hope this helps answer your questions. If you need further explanation please feel free to give us a call toll free 1-866-726-8358.
Thanks,
Greg
FTI COMPETITION CONVERTERS, LLC
This happens when a converter is not matched to a particular engine combination such as an 8" converter behind a 706 C.I. motor. The converter will constantly slip and will not meet peak efficiency of 8% or less. Basically, a converter too small or stall too high for you engine, weight, gear combination. In simple terms making more power than the converter was designed to work with. With this being said a converter rated at 5500 stall behind a 355 C.I. motor with 500HP. When placed behind 540 C.I. making 900HP will stall 6800. This is providing the converter is in good working order. I hope this helps answer your questions. If you need further explanation please feel free to give us a call toll free 1-866-726-8358.
Thanks,
Greg
FTI COMPETITION CONVERTERS, LLC
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FTI COMPETITION CONVERTERS AND TRANSMISSIONS
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1-866-726-8358
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FTI COMPETITION CONVERTERS AND TRANSMISSIONS
"IT'S NOT CHEATING, IT'S THE COMPETITIVE EDGE."
1-866-726-8358
info@ftiperformance.com
FTIPerformance.com
FTI Converter build sheet
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