Torque Stear?
Team Owner
Joined: Jul 1999
Posts: 65,492
Likes: 230
From: Orange Park Florida
Re: Torque Stear? (Scudd)
Torque steer is usually seen in a FWD car...for some reason I don't understand clearly...the differant length?? driveshafts somehow make the wheels react differantly under hard acceleration....I would think that a good posi setup woud cure the problem....but posi is not available in a FWD car with damn few if any exceptions....
so that affect is making the car go 'sideways'....kinda like say a posi unit seems to kick out going up a slick hill....
GENE
so that affect is making the car go 'sideways'....kinda like say a posi unit seems to kick out going up a slick hill....
GENE
Melting Slicks
Joined: May 2002
Posts: 2,508
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From: Wisconsin
Re: Torque Stear? (mrvette)
A decent amount of FWDs have a LSD really. The torque steer is caused by having unequal length axles. Might be from twisting the axles, the shorter one will twist less and go forward before the other one which twists the axle more and takes longer to get going. I don't know for sure, just a guess, but I know it is caused by the unequal length shafts.
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SPARTAN
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Re: Torque Stear? (Scudd)
Torque steer in a FWD vehicle is generally induced as a result of having unequal length halfshafts. With this setup, 2 things can happen.
First of all, the shafts might have unequal stiffnesses. Thus, one will wind up faster than the other and one wheel will see torque faster than the other. This torque acts on the spindle length about the kingpin axis inducing a torque.
The other thing that happens is the vehicle has unequal drive axle angles. If the halfshafts aren't perfectly level and straight (which they're not) there is a moment induced about the kingpin directly as a simple component of the total torque in the shaft. This component tries to steer each wheel toward center, but with one shaft inducing higher moments, an overall steer moment is induced in the vehicle.
To alleviate this, it's not uncommon for one side of the engine to be shimmed higher than the other (engine put in crooked essentially to even out these moments).
Is it good or bad? Bad. You want to go straight. The car wants to turn to one side.
Hopefully that answers your question. :cheers:
[Modified by ddecart, 10:28 PM 4/10/2003]
First of all, the shafts might have unequal stiffnesses. Thus, one will wind up faster than the other and one wheel will see torque faster than the other. This torque acts on the spindle length about the kingpin axis inducing a torque.
The other thing that happens is the vehicle has unequal drive axle angles. If the halfshafts aren't perfectly level and straight (which they're not) there is a moment induced about the kingpin directly as a simple component of the total torque in the shaft. This component tries to steer each wheel toward center, but with one shaft inducing higher moments, an overall steer moment is induced in the vehicle.
To alleviate this, it's not uncommon for one side of the engine to be shimmed higher than the other (engine put in crooked essentially to even out these moments).
Is it good or bad? Bad. You want to go straight. The car wants to turn to one side.
Hopefully that answers your question. :cheers:
[Modified by ddecart, 10:28 PM 4/10/2003]
