Transmission Questions Answered With ATI Performance

If there is one thing we like to do, it’s help people with their cars. One way we can do that is to show you how things work, how they get installed, or simply answer questions. Typically, when you ask us questions, we have no problem answering them. But sometimes, we need to get help to get the right answer(s). Recently, we got a few questions about transmission stuff, and who better to get the right answers than ATI Performance?

Over the years, ATI has earned a reputation for its cutting-edge technology, attention to detail, and rigorous testing under race conditions. By staying true to these basic principles, ATI has built a loyal customer base; many of whom still use parts purchased from ATI in the 1980s.

Today, ATI manufactures a multitude of high-performance parts including competition transmissions such as the incomparable Superglide, Treemaster Converters, Super Dampers, Compu-Flow Valve Bodies, Flexplates, and Adapter Kits. So without further ado, let’s get to those questions.

How do I determine what stall I need?

There are many factors that determine what RPM the converter will flash stall after it is installed in your car. When discussing converters that are race car specific, they are not built with such a wide range of stall speeds. In most cases, manufacturers will rate the stall of a converter at flash stall, which is slightly different than footbrake stall.

In essence, a torque converter will never be able to footbrake stall up to where it is actually flash stalling. It’s very difficult to tell customers what they can look for as a footbrake stall, simply because of the variables that can cause it to either hit the mark, or way undershoot it. There are basic factors and variables that can dramatically sway the amount of footbrake stall someone can see from a converter.

We previously put together this article about torque converter selection

What happens to the torque converter if I change anything in my combination?

A: Something as simple as a change in tire size can affect torque converter performance. Gear ratio, engine stroke, and cam timing are the three major changes that will alter flash characteristics. If you purchase another car, engine, or transmission, your torque converter can be sent back to ATI to update it to the new specifications. If you switch from a Powerglide to a Turbo or Turbo to Glide, the splines can be changed inside the converter. You will need all the specifications on the new combination before ATI…