bgoetz

I am thinking I will need to replace some mounts in the near future. What are the rules, stock mounting but no stiffness requirement? And what compliant mounts are the best value?

Fokker

Any engine or transmission mount is allowed provided it attaches only to the original mounting points, does not relocate the engine/transmission (other than incidental to changes in compliance material), and weighs no less than the OE mount. All components between the engine/transmission and the mounting structure are considered to be part of the mount assembly.

Differential mount bushings may be replaced but must attach in the standard location(s) without additional modification or changes. Differential position may not be changed. The amount of metal in a replacement bushing may not be increased relative to the amount of metal found in a standard bushing for the particular application. Solid metal bushings are specifically prohibited.

In the case that it comes up:
Suspension bushings may be replaced with bushings of any materials (except metal) as long as they fit in the original location. Offset bushings may be used. In a replacement bushing, the amount of metal relative to the amount of non-metallic material may not be increased. This does not authorize a change in type of bushing (e.g.,ball and socket replacing a cylindrical bushing) or use of a bushing with an angled hole whose direction differs from that of the original bushing. If the standard bushing accommodated multi-axis motion via compliance of the component material(s), the replacement bushing may not be changed to accommodate such motion via a change in bushing type, for example to a spherical bearing or similar component involving internal moving parts. Pins or keys may be used to prevent the rotation of alternate bushings but may serve no other purpose than that of retaining the bushing in the desired position.

bgoetz

So like Megan Engine mounts and really most non full metal rear diff mounts should be fine?

sillyboybmxer

What is the deal with the Rigid Collars for the subframe.....thats not really considered a "metal bushing" is it??

Fokker

As long as you're not adding any additional metal, anything will work. I plan on trading mine out with polyurethane at some point soon.

I believe technically they would fall under bushing material and at the very least you're adding metal where it doesn't come as OEM parts. It would be one thing if there was already metal material in that location that you were replacing, but you're adding something that didn't exist from the factory. Locally you could get away with it since they'll probably not be sticklers about it, but at nationals I'm pretty sure it would disqualify you from STR.

sillyboybmxer

What exactly is the "longitudinal(fore-aft) subframe connectors"?

Fokker

Something like this, minus the cross brace. It minimizes opposite direction flexing between the subframes. The S2000's frame is already plenty stiff and it would just be additional weight for autocross.

http://www.gotuning.com/product_info...roducts_id=356

sillyboybmxer

gotcha.
Im reading these rules and just like