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Discussion Starter #1
Gotta keep my car in A Street which means I'm not allowed to switch from a bushing to a bearing.

Most of the discussions I've seen on the topic have lead to the consensus being "Use Monoballs".

But if you can't, what bushing is best?
 

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Our Self-Lubricating Bushings are a great way to go. I prefer them to Monoballs as I think they hold up better over time. Oh and they are less expensive. There are hundreds of cars running them as well as 2 of our Lotuses. The directness and positivity of the suspension is very noticeable at the limit. The rubber bushings move underload and the dynamic toe is disconcerting. These eliminate that feeling completely.

Cheers,

Fred

Self-Lubricating Bushings
 

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In A Street, you can not install any bushing other than OE and remain legal. There is no provision for bushing replacement in Street class.
 

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Discussion Starter #4
My understanding is that you don't have to use OEM specifically.. The rule about bushings is:

Suspension bushings, including but not limited to those which carry the weight of the vehicle and determine ride height, may not be replaced with bushings of a different material or dimension.
 

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Right, but the different material or dimension part is going to rule out any reason to not use OEM bushings. You can't use polys or metals/etc .
 

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It doesn't say that you have to keep all the same materials, just that you have to use a bushing that uses the same material as original. Does that rule mean that you can replace the plastic/rubber/plastic sandwich that makes up our bushings with a straight plastic part of the same material?
 

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It doesn't say that you have to keep all the same materials, just that you have to use a bushing that uses the same material as original. Does that rule mean that you can replace the plastic/rubber/plastic sandwich that makes up our bushings with a straight plastic part of the same material?
Don't torture the rule. Just put OE back in. I would protest you if you had aftermarket bushings that didn't match the materials and dimensions of standard... and I don't protest.
 

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It doesn't say that you have to keep all the same materials, just that you have to use a bushing that uses the same material as original. Does that rule mean that you can replace the plastic/rubber/plastic sandwich that makes up our bushings with a straight plastic part of the same material?
No, it's come up before. There's actually been clarifications that even having metal sleeving/etc around an otherwise stock material bushing is no go, even if there is no perceived stiffness benefit. It does indeed mean that you must keep the same materials, including the same hardness of otherwise same materials (rubbers), and can't change proportions of bushings that have metal sleeves/etc to have more or less. You also cannot poly-fill bushings that have gaps, which was another common loophole "But I kept the stock bushing! I just filled all the empty space with poly.."

Sandwiching things or adding additional parts equates to changing mounting points/geometry, which is also prohibited.

I haven't read the rules in some years, but there is an overall clause in them or always was before that says something to the effect of "All other changes than explicitly listed are prohibited."
 

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No, it's come up before. There's actually been clarifications that even having metal sleeving/etc around an otherwise stock material bushing is no go, even if there is no perceived stiffness benefit. It does indeed mean that you must keep the same materials, including the same hardness of otherwise same materials (rubbers), and can't change proportions of bushings that have metal sleeves/etc to have more or less. You also cannot poly-fill bushings that have gaps, which was another common loophole "But I kept the stock bushing! I just filled all the empty space with poly.."

Sandwiching things or adding additional parts equates to changing mounting points/geometry, which is also prohibited.

I haven't read the rules in some years, but there is an overall clause in them or always was before that says something to the effect of "All other changes than explicitly listed are prohibited."
The rule wording is too ambiguous if that's the case. It should just state something to the effect that unmodified, stock suspension bushings are required.
 

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The rule wording is too ambiguous if that's the case. It should just state something to the effect that unmodified, stock suspension bushings are required.
It's meant to allow for OE-replacement bushings that are not from the OEM, as tends to be required for many vehicles where you can't necessarily get original parts any longer. The rules are very clear on the "unless explicitly stated, it is not allowed" on every single category.

All that said, unless the car is a dedicated autox car, don't let your class define you! Do what you want with the car, and just drive the appropriate class that results. Unless you're actually going out to nationals and trying to finish in the top 10, it's not going to change your experience significantly. I ran what should have been a very not-competitive Subaru in ESP for a few years just because it had a modified ECU tune - not for power, just because the stock tune had detonation, so I actually ran lower boost and a bit less timing. It was still a ton of fun, just made you want to drive that much better.
 
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