Peak torque is one of many points to consider when setting up a racing or performance torque converter. We have a page on our website, mikestransmission.com that we use to gather as much information as possible about the customers combination. That, along with dyno sheets which a lot more customers have today really gives us a good idea of the needs of the vehicle/engine combination.
When we look at those dyno sheets we look at how wide or broad the torque curve is, for instance: Good torque over a 3000-3500 rpm band within 20-30 ft lbs of peak torque, or only 1000 rpm band within 20-30 ft lbs. of peak torque. This is what we call a peaky motor, power and torque in a small rpm window. These peaky engines are more challenging to set up a torque converter for.
You can also email Mike Stewart at firstname.lastname@example.org