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JustinL's Avatar
 
Join Date: Aug 2004
Location: Edmonton AB
Posts: 278
Torsion bar delete / mount failure

I've been considering going with a rear coilover kit for my 951S, but I can't seem to get an answer to this question. Is there a risk of damaging either the rear arm or the upper shock mount if the torsion bars are deleted? The car would be primarily for street and autocross with street tires and 17" wheels.

If there is a risk of damage, what kind of risk am I running? Has anyone had a failure or even know of a failure happening? I imagine the highest loading would be from harsh bumps like potholes and train tracks. Is there any way to modify the chassis to allow a torsion bar delete?

The rear coilovers I'm considering are the bilstein escort, but I'm undecided on what spring rate.

Thanks guys,
Justin

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Old 10-21-2004, 04:32 PM
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I dont think there would be any problems, There wouldnt be any more stress there then there would be with torsion bars, In fact I would thing the coil overs might supper it better depending on where it mounts to the control arm. I say go for it. Why dont you try E-mailing Bilstein about what srping rate to use for your setup
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Old 10-21-2004, 06:16 PM
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Koni makes a rear coilover kit for our cars so my guess is that it is safe.
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Old 10-21-2004, 06:25 PM
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Yes it can be done, though it is safer to use a stiffer spring weight, which may make the ride a little too harsh for a daily driver.

The upper shock mounts should be adequate, but if you wanted an extra margin of safety, you can weld in some reenforcements.

You could also use a lighter torsion bar in place of your current one, then the coil overs are doing most of the work rather than all of it. That would also allow you to use a lighter spring weight

The torsion bar carrier is integral to the car (it helps support the torque tube) and it is not recomended to remove it.

AFJuvat
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Old 10-21-2004, 08:38 PM
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Upper shock-mount is very well reinforced, so no problems there. It's the single-shear lower mounting that you'll have to worry about. Get the Racer's Edge lower-mount and you'll be fine.

Old 10-22-2004, 12:08 AM
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