How does a stall convertor work?

A torque converter has three stages of operation: stall, acceleration, and coupling. Stall is when the transmission is in gear, but the brakes prevent the car from moving. At stall, the torque converter can produce maximum torque multiplication, called stall ratio, if sufficient input power is applied.

What are the benefits of a stall converter?

A stall converter is a bit more gentle on those parts because of the “slip” it has. Stall converters allow the car to launch in it’s torque curve and get off the line much harder than a car that has much less stall.

Does a stall converter add horsepower?

An automatic transmission in general has a way of soaking up horsepower, but the torque converter can take a potent combination and turn it into a pig when the rubber meets the road. … And while stall speed is important for a good launch, it’s also a place for horsepower to swirl down the drain.

What is the purpose of a high stall torque converter?

A higher stall torque converter will let your car accelerate better because the car will be taking off at the rpm range where it is making the most power.

How do you drive a car with a stall converter?

Do you need a stall converter with a cam?

Most street performance cars running your typical “performance” cam should be running a stall converter in the 2,800 – 3,000 RPM area. … The basic rule of thumb is; if your engine “comes alive” at say, 3,500 RPM, then you want a stall converter with about 3,500 of stall to it.

What happens if stall speed is too low?

Converter stall speed must be high enough to put the engine into the torque range where it can most efficiently launch the car. If converter stall speed is too low, the car will be lazy leaving the line; if too high, there’ll be excessive high-gear slippage—either case adds time to your e.t.

How do I know what size stall converter I need?

When choosing the stall speed that is right for your application, a rule of thumb is that the advertised stall speed will need to be at least 500 rpm higher than the beginning of the camshaft’s powerband. All aftermarket camshafts are delivered with a recommended RPM operating range.

What’s the difference between a stall converter and a torque converter?

Stall speed is the speed at which the converter holds back or limits the engine speed if the transmission output is prohibited. When your torque converter prevents the power transfer from your engine to your transmission, it increases the engine’s RPM stalls.

How do I choose a torque converter stall speed?

Ideally you want the stall to lock up somewhere close to the peak torque of the engine. Typically engines that produce more low-end torque will increase the stall speed. The same converter will stall at a lower rpm behind a less torquey – higher rpm engine.

What stall converter do I need for towing?

If your motor generates more power in the lower RPM range, you’ll want to select a converter that stalls at the beginning of that RPM range. If you use your vehicle for towing, make sure your torque is around 1800 RPMs.

What is the stock torque converter stall speed?

around 1,800-2,000 rpm Stock torque converters generally have a stall speed around 1,800-2,000 rpm. Higher stall speeds become necessary when horsepower and torque happen at higher rpm ranges.

What is the stall speed on a stock th350 torque converter?

Stock GM units have stall speeds in the area of 1400-1600 unless it’s from a GM diesel which is lower still. Simply keep in mind two things … high stall converters were designed so that engines could develop more torque while still sitting on the starting line. For trails this really isn’t an issue.

How do I know if my torque converter is locking up?

How do you spec a torque converter?

How do you perform a stall test?

Start the engine and place the transmission in drive while holding the brake pedal under firm pressure so the vehicle does not move. Then push the accelerator to the floor while holding the brakes on. Note the maximum rpm the engine reaches. This is the stall speed.

What is the stock stall converter for Turbo 350?

Turbo 350/400 Torque Converter 1350 Stall.

Will a torque converter fill itself?

As soon as you start the engine, the transmission will start circulating fluid and automatically fill the converter.

Will I fail my test if I stall?

While it’s not impossible to fail your driving test as a result of stalling, it’s highly unlikely. Most people who do so only pick up a minor fault for their mistake. So, if it happens to you, the most important thing is to respond to the situation quickly and safely, and focus on the rest of the test.

How do I know if my stall converter is bad?

When the torque converter starts malfunctioning, you may feel shuddering and even slipping in overdrive. You usually notice your car shuddering because it feels like it’s vibrating. Your car will vibrate even when you’re not going very fast. The shuddering makes the car lag and is very noticeable.

What is the purpose of a stall test?

Stall test consist of determining maximum engine speed obtained at full throttle in “D’ and “R” positions. This test checks torque converter stator overrunning clutch operation, and holding ability of transaxle clutches and low-reverse brake. During this test, make sure that no one stand in front of or behind vehicle.

Can you stall in neutral?

More specifically, driving in a gear that is too high for the speed you are travelling will cause the engine to die. … You should to be extra precise when changing gear, as even accidentally sliding into neutral can cause the car to stall if you are moving at a slow pace.