Torque Converter Stall Ratio

Most converters multiply torque by a ratio of at least 21 improving vehicle acceleration substantially. In this case the stall speed is too high it is literally impossible to get.

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The one-way clutch allows the stator to rotate in one direction only with the engines crankshaft and converter impellershell.

Torque converter stall ratio. This flow produces a maximum torque increase of 21 when the turbine is stalled. Within the stator is the one-way clutch splined onto the transmissions stator support shaft. The range listed will tell you what you can expect from the converter.

If you are unsure about these modifications the experts at RevMax Performance Torque Converters can help. It is used to move vehicles with automatic transmissions by allowing the engine to spin without being tied to the transmission. So if you are in a stall condition you have a speed ratio of zero.

If you were to have a perfect lockup with no difference between a torque converters input and output the number would be 1. The torque ratio is the torque multiplication number. The reason that a stall converter works is easy.

Your stall speed MAY vary in your specific application. Stock Torque Converters Most stock cars will have between 1000 1400 RPM stalls. If your dynamometer operator refuses to alter the software to give.

A torque converter multiplies the stall torque ratio of a normal torque device. The high rpm transition problems. By redirecting fluid flow the converter multiplies the torque produced by the engine enough to propel a vehicle down the road.

This ratio will go down as the speed ratio goes up. When enough torque is developed by the engine and the converter the turbine begins to rotate and turns the transmission input shaft. In general the desired stall speed should be 500-700 RPM below the engine RPM at peak torque.

The main factors that go into calculating the stall speed for any car include the weight of the car the circumference of the rear tires the gear ratio and of course the engines performance level. If we had changed the 373 gear to a 456 gear ratio the torque converter would in fact stall less due to the lower resistance needed to move the vehicle. This chart is ONLY a guideline.

Torque Converter Stall Chart. The action of the converters stall is what helps the car accelerate at a peak level once the driver applies the power to the driveline. Leading provider of high performance automatic transmissions torque converters and drivetrain components for race streetstrip hot rod street rod and towing TCI Racing Calculators JavaScript seems to be disabled in your browser.

Therefore worrying about what the dynamometer numbers are is a total waste of time. But both the Ford and Dodge torque converters stall between 2000 and 2500 RPM so with a heavy load the torque converter wont start turning the rear wheels until well beyond the engines torque peak. Most torque converters multiply torque in a 251 ratio over actual engine torque at stall speed.

The following chart shows the expected stall range for TCI Torque Converters. The stator incorporates a one-way clutch which has the ability to redirect the fluid flow inside the converter. Your actual stall speed may vary.

Never occur when the vehicle is being driven or raced normally. Torque converters with a low STR or low stall are not as adversely affected by this phenomenon. This ensures a margin for application for the torque converter to take off.

With the 373 ratio if we went from a 26-inch-tall tire to a 275-inch tire the roll out of the tire will give us 355 rear gear output and performance. Everything is based on the speed ratio of the converter Combs says. 2500 to 3500 rpm.

This is at a converter stall or speed ratio of 0. In you select a 2700-3000 converter it should be able to footbrake stall the torque converter to about 2700 rpm considering the. 8 rows This chart is a guideline.

When discussing street-use torque converters stall speed is typically listed as a range example. The range level will tell you a lot about what to expect from the torque converter. That is one whole gear ratio less.

450 x 18 810 ftlbs of torque at the trans input shaft when the car flash stalls to 4200 RPM from a dead stop. TCI Torque Converter Series. 450 x 25 1125 ftlbs of torque at the trans input shaft when the car flash stalls to 4200 RPM from a dead stop.

Stall speeds are a great way to rate torque converters performance level. The torque converter is designed so the fluid flows from the impeller to the turbine then back to the impeller through the stator. An engine that has 1200 RPM will only have about 80 horsepower but at 2500 RPM it could be up to 200HP.

For example if a converter has a torque ratio of 185 then for every 100 lbs of input torque the converter will deliver 185 lbs of output torque.

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