If you ever look at a dyno sheet and see that most hot performance and race engines build their torque and power at higher RPM's, you'll understand why a higher stall converter is needed.
If you want to launch the car hard and it makes its peak torque power at 5, RPM or so, you wouldn't want to select a 3, RPM stall converter where it might make half of its power would you?
It's like trying to take off in 3rd gear in a car with a manual tranny. Does any maunal tranny car launch hard off the line in 3rd gear? It would literally stall and fall on its face unless you rev it up and slip the hell out of the clutch to get moving. Performance and race engines don't make much power at 1, RPM, in fact, most of the idle at or above that, so a car with a stall that low will bog down and launch slower than mom's SUV will when it's full of kids.
Performance and race cars use lower gears and higher stall converters for a reason. You can have the biggest, baddest engine in your car but if your gearing is too tall and your stall isn't high enough, it WILL be a comlete turd off the line and it won't accelerate very well. Most guys who THINK they have bad to the bone cars but don't perform very well at the track usually have carbs that are too big, gears that are too tall, and a stall converter without enough stall.
Whenever you install a higher stall converter, be sure you use some sort of an external tranny cooler. Close menu. Close cart. What does a high stall converter do? Lot of the this was found in the article below. Back to News. Torque Converter for Ford. Torque Converter for Chevy. More Info. Related Articles. Speedway Motors employee Pat O. Check out these tips on T-5 transmissions! We can teach you some of the major differences between the Ford and GM-style T5 Flathead transmission adapter kits.
We'll also walk you through choosing the correct parts in order to make this installation a breeze! Lucas P. You will find specific recommended parts to use from Speedway Motors. Learn about how aftermarket transmission coolers can help keep your transmission cool and the different options available for cooling with our expert guide.
Some people believe that "stall" means the car won't start moving until the engine reaches that particular RPM, and that isn't even close to being true. We build race cars with 6, RPM stall converters and when you put the car in gear and let it idle, it WILL roll along at 5 - 10 MPH, just like any other car will when put in gear and with the brake off.
Stall means when the car is on the starting line, with say a 4, RPM stall converter , and the trans brake is on, which locks the transmission in first and reverse at the same time , and you hit full throttle, the engine will wind-up to 4, RPM with the car just sitting there, so when you slip your finger off the trans brake button and the tranny engages out of reverse, the car instantly launches at 4, RPM, and a race motor at 4, RPM is pretty close to its peak torque curve when leaving the line, hence the big wheelies you see on some drag cars or the incredibly low 60 Ft.
Race engines make no power at low RPM's, and are usually shy on torque, so the nastier the engine, the higher the stall speed needs to be in general anyway. Again, cubic inches, torque, vehicle weight and gear ratio have a big factor in this. Now, this doesn't get into the "flash" effect which is where a stall converter will "flash to" when your finger comes off the trans brake button.
It's a bit more complicated and I am trying to keep this simple for you, so we'll skip that area right now. A 6, RPM converter behind a stock engine might not even get to 6, RPM because the engine can't make enough torque power to spool-up to that RPM because of the load of the converter.
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