CLASS RACER FORUM - View Single Post

ss3011 · 07-07-2015, 11:31 PM

A good formula to know is K=R/(square root T) R is RPM T is Torque The way this formula works is each converter has a "K" factor, which classifies the converter. This number is usually figured at stall, or no output . So if K is a constant, you can figure the stall speed at various Torques. As long as a converter is not cavitating the K is constant.

example: if the converter has a K of 250 and T = 400 ft lbs then R will = 5000 rpm change the T to 500 ft lbs and R will be 5590 rpm.

K factors are usually figured out by testing on a converter dyno, but if you have a very accurate engine torque curve you can figure it out by doing a WOT stall using a transbrake to figure out the WOT rpm, then plugging the numbers into the above formula.

07-07-2015, 11:31 PM	#2
ss3011 Senior Member Join Date: Feb 2002 Location: Southeast Michigan Posts: 909 Likes: 70 Liked 239 Times in 114 Posts	Re: Science behind building a converter A good formula to know is K=R/(square root T) R is RPM T is Torque The way this formula works is each converter has a "K" factor, which classifies the converter. This number is usually figured at stall, or no output . So if K is a constant, you can figure the stall speed at various Torques. As long as a converter is not cavitating the K is constant. example: if the converter has a K of 250 and T = 400 ft lbs then R will = 5000 rpm change the T to 500 ft lbs and R will be 5590 rpm. K factors are usually figured out by testing on a converter dyno, but if you have a very accurate engine torque curve you can figure it out by doing a WOT stall using a transbrake to figure out the WOT rpm, then plugging the numbers into the above formula.