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lca angle

This is a discussion on lca angle within the Suspension and Handling forums, part of the General Help category; While trying to to figure out what my vibration above 70 mph is, Im guessing it's coming from my rod ...

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    Member RealLiveMD's Avatar
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    lca angle

    While trying to to figure out what my vibration above 70 mph is, Im guessing it's coming from my rod end adjustable LCA's. So I'm considering replacing them. Anyway. I noticed that my adjustable LCA's which I measured at 19.25 inches (identical to stock length) angle downward at the connection to the chassis. My car is a stock height 2002 WS6 with tokico rear shocks. Is this normal. I thought LCA's were supposed to be parallel to the ground.

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    Slow'er'Ass Mr. Luos's Avatar
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    I have never checked the LCA angle on my car.
    I adjust the pinion angle using the torque arm.

    If I remember tomorrow I will take a look and let you know.

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    Senior Member bills98ta's Avatar
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    The LCA's should be slightly upward towards the motor. You need the relocation brackets to do this. That will help your traction, but won't cause the vibration. The pinion angle could cause it. Do you have an adjustable torque arm ?

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    Have you checked your tire balance? We bought our car with fairly new tires last year and had a vibration at speed. Re-balanced all the wheels and it disappeared.

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    Member RealLiveMD's Avatar
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    had them rebalanced today. If the stock arms are 19.25in from bolt to bolt, theoretically my pinion angle should still be the same. However, this is the second time that I've heard something about the pinion angle. The local shop didn't know how to test it. What should I look for. I still have a stock torque arm. How do I measure, What do I need to adjust.... and again my Lca's definitely lean down as they conect to the chassis.

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    Senior Member bills98ta's Avatar
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    The stock torque arm isn't adjustable... Maybe a tight spot in a U-joint ?
    As far as the LCA's go, If you're drag racing it, then I would do some upgrades. If it's a DD, I wouldn't worry with them.

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    Quote Originally Posted by RealLiveMD View Post
    had them rebalanced today. If the stock arms are 19.25in from bolt to bolt, theoretically my pinion angle should still be the same. However, this is the second time that I've heard something about the pinion angle. The local shop didn't know how to test it. What should I look for. I still have a stock torque arm. How do I measure, What do I need to adjust.... and again my Lca's definitely lean down as they conect to the chassis.
    Some of the experts will post up on this -- my understanding is that you want to set the pinion angle so that it is slightly negative, meaning that the pinion points toward the ground and not up at the tunnel. The actual angle is very slight, only a few degrees. Under power, the force of the tires against the pavement acts to rotate the housing upward slightly, thereby giving you proper alignment.

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    Senior Member bills98ta's Avatar
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    Yep !!! And you need the adjustable torque arm to accomplish this. The pinion & DS should be down 1 1/2* to 2* for the A4 and 2* to 3* for an M6....

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    Member RealLiveMD's Avatar
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    Quote Originally Posted by bills98ta View Post
    Yep !!! And you need the adjustable torque arm to accomplish this. The pinion & DS should be down 1 1/2* to 2* for the A4 and 2* to 3* for an M6....
    I'm a car novice.. so what does the * mean.

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    Quote Originally Posted by RealLiveMD View Post
    I'm a car novice.. so what does the * mean.
    Degree(s)

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    King 0f n00bz shady milkman's Avatar
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    Quote Originally Posted by pajeff02 View Post
    Some of the experts will post up on this -- my understanding is that you want to set the pinion angle so that it is slightly negative, meaning that the pinion points toward the ground and not up at the tunnel. The actual angle is very slight, only a few degrees. Under power, the force of the tires against the pavement acts to rotate the housing upward slightly, thereby giving you proper alignment.
    Quote Originally Posted by bills98ta View Post
    Yep !!! And you need the adjustable torque arm to accomplish this. The pinion & DS should be down 1 1/2* to 2* for the A4 and 2* to 3* for an M6....
    you guys are right on the money.

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    Senior Member bills98ta's Avatar
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    I'm an A4, but I have mine at 2 1/2 - 3* because I launch harder than most... 4600 stall convertor flashes real good !!!

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    King 0f n00bz shady milkman's Avatar
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    Quote Originally Posted by bills98ta View Post
    because I launch harder than most... 4600 stall convertor flashes real good !!!

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