Turbo in 2007 5.4
12-23-2013, 06:48 PM
#41
12 Second Truck
I don't have a stock converter. I have a Circle D converter rated at 3000rpm.
As for the specs on the stock converter I'm going by Darrin Burch of BC Automotive who built my transmission.
"For reference, the factory stall on his truck is rated at a minimum of 2404 and a max of 2842 on a completely stock engine. With the extra torque he has with that blower it's going to push a good amount past that already and I wouldn't want to back him down performance wise with a lower stall converter.
Darrin"
Heres a link to the thread.
http://m.f150online.com/forums/showthread.php?t=405315
Last edited by Blown Ford; 12-23-2013 at 07:02 PM.
12-23-2013, 10:22 PM
#47
12 Second Truck
Ok. So you were at 1700 and you do realize that when doing the foot brake method you should add between 500-1000 rpms to get close to the approximate. That puts you any where from 2200-2700. But the foot brake method is meaningless as described here as is the better way of doing it. http://www.protorque.com/torque-converter-faq.html#5
"What is stall speed and how do I determine what stall I have now?
Stall speed is a term used to describe the rpm at which the torque converter transfers the power from the engine to the transmission. There are different ways to test stall speed. "Foot brake stall" is when you press the brake pedal and then press the gas pedal. When the engine rpm doesn't go any higher or the tires start to spin that is "brake stall". (DO NOT TRY THIS! THIS MEASUREMENT IS MEANINGLESS AND POTENTIALLY DANGEROUS TO YOU, THE TRANSMISSION AND THE TORQUE CONVERTER!) "Flash stall" is when you, from a dead stop, press the gas pedal to wide open throttle (wot). Watch your tach needle, you will see the needle jump to a certain rpm, that is "flash stall". A drag racing-style trans brake will give you closer to the true stall speed of a torque converter."
"What is stall speed and how do I determine what stall I have now?
Stall speed is a term used to describe the rpm at which the torque converter transfers the power from the engine to the transmission. There are different ways to test stall speed. "Foot brake stall" is when you press the brake pedal and then press the gas pedal. When the engine rpm doesn't go any higher or the tires start to spin that is "brake stall". (DO NOT TRY THIS! THIS MEASUREMENT IS MEANINGLESS AND POTENTIALLY DANGEROUS TO YOU, THE TRANSMISSION AND THE TORQUE CONVERTER!) "Flash stall" is when you, from a dead stop, press the gas pedal to wide open throttle (wot). Watch your tach needle, you will see the needle jump to a certain rpm, that is "flash stall". A drag racing-style trans brake will give you closer to the true stall speed of a torque converter."