Anti-roll bar or not? - Team Camaro Tech
Brakes, Suspension & Steering Conversion questions, Steering & Handling

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post #1 of 6 (permalink) Old Jul 24th, 17, 11:03 PM Thread Starter
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Thomas
 
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Anti-roll bar or not?

I got a 68 with qa1 control arms a 1.25 sway bar coil overs front rear with a 4-link. Trying to decide if a anti roll bar will help or hert the handling on the street. What do you guys think?
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post #2 of 6 (permalink) Old Jul 25th, 17, 05:33 AM
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Greg
 
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Re: Anti-roll bar or not?

Handling it will help immensely. No brainer.

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post #3 of 6 (permalink) Old Jul 25th, 17, 05:48 AM
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Don
 
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Re: Anti-roll bar or not?

What is the front suspension etc? What is the rear spring rate? I've had a few pro-touring first gens and none of them needed a rear sway bar. If you are running a high rear spring rate you will degrade the ride. This has been discussed before. Search rear sway bar....

Maybe David Pozzi will weigh in here....

Don

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post #4 of 6 (permalink) Old Jul 25th, 17, 08:44 AM
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Dave
 
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Re: Anti-roll bar or not?

In Drag Racing they use a huge anti sway bar to counter act engine torque. In road racing the anti-roll bar is used to counteract the Newtonian forces encountered when turning (his second law governing acceleration). The bar has to be stiff enough (high enough spring rate) to keep the wheel on the ground despite the car body lifting in response to inertia.

It is better to design the suspension from the frame up to counteract these forces, but we don't build cars that way. We take what the factory gives us and modify them to meet our desires. In this regard a sway bar is a Band Aid; but it can still be effective.

The spring rate of the sway bar is controlled mostly by it's diameter. As such a large hollow bar will be a much better choice than a large solid bar as the solid bar adds mass that has to be counteracted by the shocks, and springs. Though the shape and attachment points also affect the leverage the bar can apply.

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post #5 of 6 (permalink) Old Jul 25th, 17, 04:46 PM
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Steve
 
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Re: Anti-roll bar or not?

Adding a rear sway bar should be part of a planned suspension upgrade. Back in the early 70's I read the catalog info, got a bar and installed it on the car i am working on still, then took it out for a beating to assess my improvement. Spring rate? Wazzat??? Shock type settings and/or rates.... huh? Slammed it into a corner, the inside wheel came up and i thought i was going over. Dunno which i changed out first, the bar or my briefs but they were both gone shortly. I would do it again today but as part of a package not pot luck.
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post #6 of 6 (permalink) Old Jul 26th, 17, 04:19 PM
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David Pozzi
 
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Re: Anti-roll bar or not?

I assume you are asking about adding a rear bar?
I've worked on a bunch of cars so far. All but one have had a rear sway bar. The one was Bad Penny, with the help of Global West Suspension, the setup was different on that car. A lot was done with the rear shocks to give the effect of a rear bar. In the end, we did put a smaller rear bar on the car to get the car balanced. Even with the shock tricks. Too much rear bar hurts on corner exit so you don't want to go crazy with rear bar rate. IF the rear roll center is high enough, you hardly need a rear bar, but that would take a very special suspension. If you have a suspension with watts link or Panhard bar, then as you raise them, the rear get's stiffer in roll. On Bad Penny, we raised the rear watts bellcrank which raised the rear roll center.

If you drive at max cornering G's around a fairly large sweeper, like a Freeway on ramp and find the front is understeering, then you need a rear bar or bigger rear bar. Or higher Panhard bar or Watts setting. If your rear tires are wider than the front, then more rear bar is needed.

Check my web page for First Gen Camaro suspension info:
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Last edited by davidpozzi; Jul 27th, 17 at 06:44 PM.
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