I just found out that Z1 developed a cost effective alternative rather than dropping the whole rear subframe to replace the bushings, just add these collars with stock bushings and you are good to go. Cheaper alternative in both labor and cost to stiffen the rear subframe without costing an arm and leg.

 

Curious to see how the performance compares to the standard bushing replacement. Definitely convenient not having to remove the entire sub-frame.

 

I love Z1, they make a TON of good stuff for the G that you can't find anywhere else.

 

Interesting as I have a blown sub frame bushing on my G. Need to check this out.

 

Very functional product at a good price. I have the Spoon rigid collar kit which ran closer to $400.

 

For those who are curious like me, here is the review link. I will be ordering them soon and will update this thread with my own observations. Based on this thread, It was noted that the feel will be more noticeable if the oem diff bushing is also replaced which I did last month so I am beyond excited. I could imagine having an aluminum driveshaft plus these z1 collars and upgraded diff bushings on hard launches, that is why I opt-in with the ARC license = more fun!

https://www.myg37.com/forums/brakes-...g-collars.html

 

Hmm neat. I'm starting to enjoy my car again. Will look into this!

 

Highly recommend these. Great improvement in handling. Minimized my wheel hop on launches and car is more predictable at speed. Breeze to install. Well worth every dollar.

 

All these really should be doing is preventing the power shimmy, right? Maybe a little stiffer when transitioning because of all the bushing flex. I'm confused on how it's necessary on a stock car.

 

For the record I have full Energy poly bushings all the same durometer if that is what it's called. 130k stock springs and shocks, car isn't showing they are blown .

 

This video does a good job of showing how collars improve handling. Check out 2:30.

 

Any reports on these?

I was getting the penguin wiggle (shimmy) this weekend but don't want the car to be harsh (hence why these bushings were air Gap bushings in the first place).

Wanted to know from an owners perspective how they like them. Currently NVH is low.

 

I'll be filling my subframe bushings with poly next week to remove the last vestiges of delay in putting down the power after my poly engine mounts. I'll update in this thread on NVH impact as well as effectiveness, seems like a cheap fix without any disadvantages compared to the Z1 inserts, and its been done with successful results on many other performance cars. Theoretically doing this would produce less NVH than the Z1 inserts as well although like you I have no idea how much that actually is.

I have a feeling it will be significant, especially if you've already done your diff bushings as currently we've got blown rubber bushings isolating us from the noise created from the poly diff bushings.

Honestly, I'm loving the whole Honda-ifcation of the G/Z scene, it's more fun janking together DIY fixes than dropping big $$ on brand name parts as long as it's not in critical areas. All we need is a step-by-step LS swap DIY and somebody with cheap solutions for wiring and the G/Z is well on its way to becoming the new 240, which is what I was hoping for when I bought it.

 

After 3+ months I'm still loving these inserts. Car is more predicable at speed. IE 100 mph corner and hitting a bump. I agree with csqlighting that poly bushings would work as good, maybe better. However, the collars are a 30-60 min install job. Think you have to drop the rear subframe to do poly bushing. Much more labor involved.

As for NVH, you'll notice a little more transmission noise. Not much at all but it is louder.

 

You're hearing the diff noise I guessed at in my previous post, and maybe some transmission noise transmitted through the driveshaft, into the diff, through the diff bushings, though the subframe bushings, through the frame, and into your @ss! Do you have poly diff bushings too by any chance?

You can get poly in a liquid form from a variety of sources, I'm looking for something between 60a-80a hardness so I'm waiting for responses from various product engineers for poly adhesive products from home depot, etc. What I'm going to do is the exact same install procedure as the Z1 mounts, except I'm going to seal off the bottom of the bushing with contact cement and duct tape and pour liquid polyurethane into the top of each bushing to fill the voids and keep it all together. Wait 48 hours, poly bushing inserts with no disassembly!