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#11 | |
Veteran Member
Join Date: May 2006
Location: Murfreesboro TN
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I know I went from another builder's setup, where they had bypassed the cooler in the case and the pump, to an unmodified case and pump, with a simple steel 5/16" line loop between the two cooler fittings, and saw over 400 less RPM for the same MPH, in a GM automatic with an 8" ATI converter in a Stock Eliminator car. But it did not seem to change the flash RPM, leaving off a two step set at 3200, the converter flashed to 5700 RPM regardless of whether the cooler was bypassed inside the transmission, or externally.
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Alan Roehrich 212A G/S |
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#12 |
Senior Member
Join Date: Feb 2002
Location: Southeast Michigan
Posts: 909
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Typically the converter charge pressure is regulated, this is what goes into the converter. The outlet of the converter goes first through the cooler, then all of that is plumbed through the lube system (gears, and clutch plates). If changing the case and pump affected the restriction in the cooler loop, it could change the converter charge pressure which could change the efficiency , that might get you the 400 rpm. The problem is you are getting less lube to the gears and clutches, which means more transmission maintenance, might be a good trade off if the on track performance is improved.
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#13 | |
Senior Member
Join Date: Nov 2007
Location: Div. 6, Eastern, WA
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Dave Noll, EF/S ,?/SA 6526 |
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#14 |
Senior Member
Join Date: Feb 2002
Location: Southeast Michigan
Posts: 909
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The problem with too much converter charge pressure is it will lead to a ballooned converter, and also pushes hard on the crankshaft, which could lead to crankshaft thrust bearing problems. Converter charge pressure is usually limited to around 100 psi.
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