What causes a torque converter to lock-up?
However, when the engine turns more slowly it causes the torque converter to slip, creating heat. Slipping reduces fuel economy and heat can damage the converter and the transmission. The solution is to lock the converter. Lock-up eliminates the slippage, which reduces heat and improves fuel economy.
What happens when torque converter locks up?
Torque converter lock-up is engaged through a solenoid mounted inside the transmission. This clutch acts just like a clutch disc in a manual transmission application. When the converter is “locked up” this clutch is forced against the front of the converter creating a direct drive from engine to transmission.
Can a torque converter lock up an engine?
There are basically three ways a torque converter lockup clutch can fail: It can stay locked up, stalling the engine when the car is braked to a stop; it can never lock up, which shows up as an increase in fuel consumption and radiator temperature; or it can slip when engaged, allowing engine speed surges at a constant …
What would cause a torque converter not to lock up?
1. Engine temperature too cold – most converters will not lockup until the coolant reaches about 120°F. 2. Overdrive unit locked out – when an automatic overdrive is “locked-out” the torque converter lockup feature will also be locked out.
Do all torque converters lock up?
How does a lock up torque converter work?
The Working Of Lock Up Torque Converters A lock up clutch is engaged as soon as the engine and the transmission run at the same speed approximately. The speed at which a lockup mechanism automatically activates is about 64 kph. For transmission to lockup, however, some requirements follow.
What is a lock up converter on a GM transmission?
The lock up converter was introduced many years ago but due to the extra costs, it never gained popularity until the late 1970’s when the energy crisis demanded a more efficient operation of automatic transmissions. The GM 700-R4 & 200-4R transmissions utilize a lock up converter to help create a more efficient transmission.
What are the factors that affect the performance of a lockup converter?
Coolant temperature, lockup threshold speed, cruise control, and gears are some parameters that affect the functionality of lock up converters. If all the factors have fallen into place and the lock up activates, the impeller and the turbine hook-up.
How do you lock in the converter?
Based on this information, and using your software of choice, set the mph or RPM goal, as well as the gear for the converter to lock in. Locking the converter can be done in 1st through all forward gears, depending on what your transmission supports.