I installed mine back in feb/march of last year. Really changed the feel of how the car puts the power down. I have innovative 75As for diff/motor/trans and love them. I really dont think the vibration is that bad but they have been on for over a year except for the diff.

 

i'm wondering that as well. My other solution (if theses aren't legal) is to fill my stock mounts with 75A Urethane from McMaster Carr.

 

i'm wondering that as well. My other solution (if theses aren't legal) is to fill my stock mounts with 75A Urethane from McMaster Carr.
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I believe Jake (NMRADO) has done that in case you have any questions. I have never done anything like that and would be interested in seeing how it's done.

 

I bought spare mounts with the intent of modifying them, but never got around to it. I've seen images of modified mounts on S2ki...somewhere in this forum, I'm sure. Can't seem to find those images now.

 

I plan on doing this sometime this month before my first event in Feb (PCA el Toro). I'll try to remember to take pictures. Im going to drill the mount to get all the oil out then fill the entire mount with pourable urethane. Probably going to use the harder stuff like 80-95A.

 

14.8.D Differential Mount Bushings
Differential mount bushings may be replace but must be attached in the factory 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.

Actually after reading the 2013 rulebook it looks clear to me that replacement mounts are not legal as the rule clearly states the mount's bushings may be replaced. Also the OEM part is labeled the differential mount as the bushing is not available for replacement. Hmmmmm

50730-S2A-013 RUBBER ASSY., R. DIFFRENTIAL MOUNTING
50740-S2A-023 RUBBER ASSY., L. DIFFERENTIAL MOUNTING

 

I'm not sure that's how the rules suppose to be read. The bushing/mount is all one piece. Therefore if you really want to have a play on words you could refer to the items as either bushings or mounts. The point of the rule is you are allowed go change the bushing material in the mounts. On our cars such item is made as one piece. Just like the motor mount BUSHINGS that most everyone has. Ill write a letter asking for clarification but the point of the rule is you can change the bushing material via the diff mounts. That's it. Why have some stupid play on words to try and argue they arn't legal? They also weight more then the stock bushings so the weight saving thing isn't a issue. You're adding 1 lb 4 oz.

 

its just one way of looking at the rules. Rules are always open to interpretation. I'm not going to buy a part then try to argue that it is legal. I'm looking for an improvement within the ruleset.

Also you need to read the rules because it states for engine/transmission mount (not bushing). This has been changed as well if you guys have not noticed. I haven't weighed the innovative transmission mount yet but if it is heavier than the stock mount then it is legal now. We can replace the entire assemblies because they allowed for mount replacement. The diff is for bushing replacement only as the rules are written as of now and are considered separate from the engine/transmission mount allowance.


J. 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.

 

I haven't read the rules for this coming year so I'm not sure what got changed. I was under the understanding that we could replace the diff mount/bushings. With my OEM ones leaking looking at the prices the aftermarket ones are cheaper then buying new OEM ones. So I didn't go buy a part then try to argue it's legal, I brought the part with the understanding it was legal.

Honestly whats the difference between a OEM bushing/mount filled with 75a poly and a aftermarket mounts filled with the same exact 75a poly? Oo besides I added 20oz to my car with the aftermarket ones. I'll write a letter tonight.

 

I will write one as well... hmmmm... Perhaps a rules change/alteration is in order for re-clarification. Clearly the intent is to be able to change the bushings due to wear with a somewhat performance item.