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zonker · 02-23-2011, 07:34 PM

well besides the 90 mile trip at 50-55mph, i have another thought... there is a substantial uphill grade for approx 1 mile on the I-15 near my home. I will see how slow i can lug the car before it wants to shift out of TC lockup, so basically i'll try it at 50mph (1850 rpm) and then try at subsequently higher speeds until the trans will not unlock the TC. That should give me an idea about the motor's torque efficiency at lower rpms.

UPDATE: did the I-15 hill climb. Set the cruise control for 50mph. The white rag would lose speed and downshift from TC lockup. At 55mph, she climbed without a speed drop and kept in TC lockup. So... I think my magical hwy speed rpm is greater than 1850 and less than 2050 rpm.

02-23-2011, 07:34 PM	#28 (permalink)
zonker 500 Mile Metro Traveler Join Date: Jan 2011 Location: Sun City, CA Posts: 183 '89 Dakota LB - blue - '89 Dodge Dakota V6 LE 90 day: 19.8 mpg (US) '17 Fiat 124 - SunFiat - '17 Fiat 124 Spider Classica 90 day: 30.51 mpg (US) '89 Metro - The Egg - '89 Geo Metro Base 90 day: 50.71 mpg (US) '94 Alto - The Box - '94 Suzuki Alto Ce-L 90 day: 39.5 mpg (US) Thanks: 14 Thanked 13 Times in 10 Posts	well besides the 90 mile trip at 50-55mph, i have another thought... there is a substantial uphill grade for approx 1 mile on the I-15 near my home. I will see how slow i can lug the car before it wants to shift out of TC lockup, so basically i'll try it at 50mph (1850 rpm) and then try at subsequently higher speeds until the trans will not unlock the TC. That should give me an idea about the motor's torque efficiency at lower rpms. UPDATE: did the I-15 hill climb. Set the cruise control for 50mph. The white rag would lose speed and downshift from TC lockup. At 55mph, she climbed without a speed drop and kept in TC lockup. So... I think my magical hwy speed rpm is greater than 1850 and less than 2050 rpm. Last edited by zonker; 02-23-2011 at 08:31 PM..