CABs: Delrin vs. Solid

[CabbE30]

Anyone have any review on delrin cabs and how they compare to solid cabs like treehouse's. I currently have oem cabs and I was interested in getting solid ones until I found offset delrin inserts for cheaper.

[bmwguy325is]

Derlin is pretty stiff. I am almost sure they will ride and handle like the treehouse bushings.

[Roysneon]

What are the THR ones lined with? I always assumed they were Delrin. They can't just be metal on metal, except in the case of the UUC adjustable rod end style ones.

[CabbE30]

What are the THR ones lined with? I always assumed they were Delrin. They can't just be metal on metal, except in the case of the UUC adjustable rod end style ones.

I thought the were delrin as well.
Which begs the question, why not just use delrin inserts in oem lollipops?

[Holland]

The treehouse ones are lined with delrin.

Here is the thing though. The treehouse bushings have maybe a quarter inch of delrin? Then it's all steel. Using delrin inserts will give you much more bushing material.

I'm on treehouse. I love them but they are certainly not for everyone. Harsh doesn't even begin to describe it.

[Cronopoulos]

Harsh doesn't even begin to describe it.

Amen to this right here. I run I.E.'s delrin bushings. They are harsh as well, if you want a plush ride, look away.

[CabbE30]

I was interested in the delrin inserts to remove the shimmy under heavy breaking. Im assuming its from my CABs because they're pretty damn old.
So now I guess I must choose the delrin inserts vs polyurethane since the treehouse's are out of my budget/desire.

[jlevie]

I was interested in the delrin inserts to remove the shimmy under heavy breaking. Im assuming its from my CABs because they're pretty damn old.
So now I guess I must choose the delrin inserts vs polyurethane since the treehouse's are out of my budget/desire.

While worn out control arm bushings can result in shimmy under braking. But that can also be from worn shocks, upper strut bearings, control arms, or tie rods. New OE parts would eliminate that.

Delrin bushings (Treehouse or other) are probably not you what on street car or one that isn't a dedicated track car. There is quite a bit of an increase in NVH. Solid M3 rubber control arm bushings are a reasonable compromise between the OE parts and Delrin. Better handling and little increase in NVH.

[CabbE30]

While worn out control arm bushings can result in shimmy under braking. But that can also be from worn shocks, upper strut bearings, control arms, or tie rods. New OE parts would eliminate that.

Delrin bushings (Treehouse or other) are probably not you what on street car or one that isn't a dedicated track car. There is quite a bit of an increase in NVH. Solid M3 rubber control arm bushings are a reasonable compromise between the OE parts and Delrin. Better handling and little increase in NVH.

Thank you, this really helped me out.
Quite a few of my components are new so I know what I need to change.

[MR 325]

I would really consider the OEM M3 bushings if I were you. I've run them in many cars.

I believe they're about $45 for the pair.

[shiboujin]

Wow you guys are fucking pussies. Really? that much more road noise? I shoved some on a basically stock car. No real difference other than handling got shit tons better. I noticed no extra road noise. I put solid subframe and diff bushings in the rear, I can hear the diff now at highway speeds. That's it.

Now, the THR ones are nylon. Not delrin. Nylon is slightly stiffer than delrin. The advantage to the THR cabs is that you have extra clearance for things like a kick assier exhaust. It also flexes that much less. IE THR with the nylon insert will flex less than a nylon CAB for the stock lollipop.

Also keep in mind that it's M3 offset. You can get a stock delrin insert.

From my point of view, you're a moron if you don't go at least delrin insert. I prefer the THR one as it's that much stiffer. Ideally, however, I want these bad boys. Yea I'd rock them on the street: http://www.akgmotorsport.com/catalog...Control%20Arms

[MR 325]

Well, good to know that I am a moron.

I'll stick with my OEM E30 M3 bushings.

[shiboujin]

Well, good to know that I am a moron.

I'll stick with my OEM E30 M3 bushings.

There there, you aren't a moron. For $45 and a street car, it's probably the most economical choice. Just isn't getting the best performance out of it. I drove an E30 around with the solid M3 ones (forget if that's OEM or not) and it was kinda... meh. Did the trick but not as good as the nylon/delrin ones.

*hug*

[burkey001]

I just bought another E30. 100% standard 318is.

I swapped the THR CAB's off my other E30 (with AST4210, etc quite 'over the top' suspension) to see how they affected NVH on an otherwise standard E30.

Well gee, they really make the front end go *bang* over bumps. Quite startingly harsh given I have about "50 inches" of suspension travel on a stock iS and the car is otherwise super comfy and compliant.

Sharp bumps really make themselves known with THR.

Steering feel is better sure, you feel a lot more vibration and such through the wheel as you go over different surfaces. For a daily car, I don't know you'd want THR CAB, as good as they are for a DE / track car.

[Holland]

Wow you guys are fucking pussies. Really? that much more road noise? I shoved some on a basically stock car. No real difference other than handling got shit tons better. I noticed no extra road noise. I put solid subframe and diff bushings in the rear, I can hear the diff now at highway speeds. That's it.

My car is my DD, I have THR cab's, gc spec plates, aluminum subframe bushings, the whole shot. I personally like it but most don't.