Rear Suspension Movement

[racerb]

Is there anyone making a replacement bushing for the trailing beam on these cars? I ran a Nissan several years ago with a simular rear set-up and the Nismo replacement bushings for that car made a world of difference.

[NJ Drive]

Originally Posted by racerb

Is there anyone making a replacement bushing for the trailing beam on these cars? I ran a Nissan several years ago with a simular rear set-up and the Nismo replacement bushings for that car made a world of difference.

I have the Delrin sitting here just for that reason, but I'm uncertain if it will provide more gains over headaches in terms of bind. Perhaps something of a softer durometer to merely fill in the voids is the approach I may take.

[xnamerxx]

From what I've seen the suspension moves in a sideways arc so you'd need a ball and cup to accommodate the movement. Look at the mustang rear control arm bushings to understand what I mean. Going to a solid 1 piece would be a really bad idea.

[CTScott]

Originally Posted by racerb

Is there anyone making a replacement bushing for the trailing beam on these cars? I ran a Nissan several years ago with a simular rear set-up and the Nismo replacement bushings for that car made a world of difference.

There is a TRD set:

48726-NP900 Rear suspension arm seat inner
48726-NP910 Rear suspension arm seat outer

Each side requires an inner and an outer. They are one of the standard upgrades for the Netz Cup Vitz race cars.

http://www.trdparts.jp/english/parts_bush-vitz90.html

Resin Cups.jpg

Resin Cups 2.jpg

[CTScott]

Actually a third part is needed: 48752-NP900 (one for each side {part 4 below}).

Resin Cups 3.jpg

[racerb]

Originally Posted by CTScott

There is a TRD set:

48726-NP900 Rear suspension arm seat inner
48726-NP910 Rear suspension arm seat outer

Each side requires an inner and an outer. They are one of the standard upgrades for the Netz Cup Vitz race cars.

http://www.trdparts.jp/english/parts_bush-vitz90.html

Attachment 49934

Attachment 49935

Those would probebly work best since in all likelyhood they are only about an 80 durometer bushing material. A urethane based mount would have enough give to not create so much bind. Or am I seeing them wrong and they are a delrin type material?

[NJ Drive]

Originally Posted by xnamerxx

From what I've seen the suspension moves in a sideways arc so you'd need a ball and cup to accommodate the movement. Look at the mustang rear control arm bushings to understand what I mean. Going to a solid 1 piece would be a really bad idea.

Exactly my thoughts as well.

[NJ Drive]

Originally Posted by CTScott

There is a TRD set:

48726-NP900 Rear suspension arm seat inner
48726-NP910 Rear suspension arm seat outer

Each side requires an inner and an outer. They are one of the standard upgrades for the Netz Cup Vitz race cars.

http://www.trdparts.jp/english/parts_bush-vitz90.html

Attachment 49934

Attachment 49935

You are my hero Scott. LOL, that's all I want. Now who can import these the fastest?

Originally Posted by CTScott

Actually a third part is needed: 48654-NP900 (one for each side {part 4 below}).

Looking over the part#s though, part #4 looks to be a front control arm bushing.

[CTScott]

Originally Posted by racerb

Those would probebly work best since in all likelyhood they are only about an 80 durometer bushing material. A urethane based mount would have enough give to not create so much bind. Or am I seeing them wrong and they are a delrin type material?

Toyota lists them as "Resin", but I would suspect they are either Nylon or Delrin.

[Yarflana]

Perhaps I totally missed it, but what is the OP trying to correct, or improve? I completely saw the video and didn't notice any problem, but I am not well versed in suspension so I likely am missing the obvious to you track/racing guys.

[NJ Drive]

Just an FYI, JapanParts estimates $250 shipped to NJ for those white torsion beam bushings. Steep price to pay over an afternoon and some 3M window weld.

[xnamerxx]

Originally Posted by Yarflana

Perhaps I totally missed it, but what is the OP trying to correct, or improve? I completely saw the video and didn't notice any problem, but I am not well versed in suspension so I likely am missing the obvious to you track/racing guys.

I was looking for lateral movement and found it.

So your asking why is that bad???

Well lateral movement is bad because you decrease the tractive capacity of the tires when there is deflection. What that means is during turn in when the rear suspension deflects the total amount of traction the tires can hold is reduced, when the suspension settles in mid turn you get more total traction, and then a decrease in traction during corner exit. So during transitional elements, think moose test or NATO test or Slalom, deflection in the rear suspension is really bad as it makes the rear want to walk away and makes the car unstable.

[Viperoni]

Originally Posted by NJ Drive

Just an FYI, JapanParts estimates $250 shipped to NJ for those white torsion beam bushings. Steep price to pay over an afternoon and some 3M window weld.

Window welding the stock bushing would likely introduce bind... That JapanParts bushing is built such that it won't bind.

[xnamerxx]

Originally Posted by NJ Drive

Just an FYI, JapanParts estimates $250 shipped to NJ for those white torsion beam bushings. Steep price to pay over an afternoon and some 3M window weld.

Here is a link to some real poly mix just as an FYI.

Poly Mix

[NJ Drive]

I'm no stranger to Forsch casting urethane. Thank you though. Window weld isn't anywhere remotely close to even a 50A, as it has the consistency of silicone when it's hard. There'd be no risk of binding but in hindsight probably not worth the effort. Guess I just need to plunker down the dough for something TRD already engineered correctly.

[CTScott]

Originally Posted by NJ Drive

You are my hero Scott. LOL, that's all I want. Now who can import these the fastest?




Looking over the part#s though, part #4 looks to be a front control arm bushing.

That's right - The correct part number for the rubber piece for the center of the resin pieces is: 48752-NP900 (Rear suspension support stopper)

[DeathBeard]

I installed the trd rear swaybar on my car on saturday and took it off on Sunday, made my car feel weird and didn't like the added oversteer made it feel sketchy on the freeway

[NJ Drive]

Originally Posted by CTScott

That's right - The correct part number for the rubber piece for the center of the resin pieces is: 48752-NP900 (Rear suspension support stopper)

Scott, out of the parts listed, only the two white resin rings are applicable to the torsion beam bushing. 48752-NP900 pertains to a replacement bushing that resides on the shock shaft, just above the dust boot.