The Torque steer

Torque steer is a phenomenon that mostly affects front-wheel-drive cars where heavy acceleration causes the vehicle to veer to the left or right.
Take a front-wheel-drive car to a wide, open space where you can test acceleration from about 0 to 15 mph without hitting something or someone (perhaps a big empty parking lot). Take both hands off of the steering wheel and give the accelerator a brief but firm squeeze. What did you notice? For most FWD cars, you likely saw the steering wheel twisting to one side and the vehicle lurching to either the left or to the right. Some cars pull more than others, but what you just witnessed is torque steer.
Torque steer can be scary because it can be unpredictable, particularly for novice drivers. However, because you have to be on the throttle to even experience torque steer, it's not something that most people ever have to deal with. From an enthusiast's standpoint, you want less torque steer simply so that you can go faster in the direction your car is actually pointed.


How it is caused?
In a rear-drive vehicle, the half-shafts are equal in length and react identically to a load.
(Credit: Antuan Goodwin/CNET) Torque steer can be caused by a number of factors, such as a difference of traction available beneath the two drive wheels, or a difference in the inflation levels of the tires causing the two sides to grip unequally. However, the most common cause of torque steer is a compromise that is inherent to the front-engine, front-wheel-drive configuration: the transversely mounted engine.


In most rear-wheel-drive vehicles, the engine, transmission, driveshaft, and differential sit in a nice line that runs down the center of the vehicle. The central positioning of the differential means that the half-shafts that connect the wheels to the differential are of equal length. This means that the half-shafts should ideally react to forces and deform in a roughly identical manner to one another.
In most front-drive vehicles, there is no driveshaft. The engine, transmission, and differential are combined into a single package. Because this package has to still fit in an engine bay with its weight more or less centered between the wheels, the transmission and differential end up hanging off the end of the engine block to one side of the vehicle. This configuration results in half-shafts that are of unequal length.

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