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      02-24-2019, 10:44 AM   #1
Phil_M_Robinson
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Rear Trailing Arm - ECS vs OEM

Hi all

What is the consensus on rear trailing arms?

Is it worth upgrading to the sturdier ECS variants, or is it worth keeping the weaker OEM unit in place, thus keeping the sacrificial component in place?

I am in the process of doing a rear subframe rebuild and I'm unsure which direction to take

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      02-25-2019, 01:49 PM   #2
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Buy fall line Motorsport, I wouldnt Trust anything Ecs branded.
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      02-25-2019, 09:52 PM   #3
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Buy fall line Motorsport, I wouldnt Trust anything Ecs branded.
Fall-line doesn't make that arm as far as I know. Plus I have not had the best experience with the couple of Fall Line parts I have had. I switched over to SPL. I have been trying to convince SPL to make that particular arm but no luck so far. I believe that ECS has the only product available.
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      02-25-2019, 10:32 PM   #4
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Quote:
Originally Posted by slicer View Post
Fall-line doesn't make that arm as far as I know. Plus I have not had the best experience with the couple of Fall Line parts I have had. I switched over to SPL. I have been trying to convince SPL to make that particular arm but no luck so far. I believe that ECS has the only product available.
What issues have you had Iím curious?
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      02-25-2019, 11:53 PM   #5
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Quote:
Originally Posted by amrazM View Post
Quote:
Originally Posted by slicer View Post
Fall-line doesn't make that arm as far as I know. Plus I have not had the best experience with the couple of Fall Line parts I have had. I switched over to SPL. I have been trying to convince SPL to make that particular arm but no luck so far. I believe that ECS has the only product available.
What issues have you had I'm curious?
The dust boots on the rear camber arm disintegrated after 2k miles. The locking nut design is not easy to use and tends to loosen on its own. If you want the track version which corrects both issues it's cost prohibitive. Their pricing is almost double SPL (for the FL race arms) and the quality isn't at that level.

In all fairness I have not been happy with the Ti bolts on the locking clamps from SPL. However the locking design is superior and I'm replacing with Stainless hardware to correct. SPL offers more arms and excellent customer service.
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      02-25-2019, 11:58 PM   #6
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What arms have you done slicer?

We have them fully on all the race cars but have yet to drive any on the street
Was considers doing all my rear arms

And yes the ti hardware stretches sadly :/
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      02-26-2019, 10:46 AM   #7
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Quote:
Originally Posted by StripclubDJ View Post
What arms have you done slicer?

We have them fully on all the race cars but have yet to drive any on the street
Was considers doing all my rear arms

And yes the ti hardware stretches sadly :/
I have the full SPL package front and rear. I had Fall line LCA monoball, sway bar end links, and rear toe link. Toe link is all I have remaining and it's getting replaced with SPL this week. All the SPL hardware is getting converted to stainless.
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      02-26-2019, 11:01 AM   #8
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Quote:
Originally Posted by slicer View Post
Quote:
Originally Posted by StripclubDJ View Post
What arms have you done slicer?

We have them fully on all the race cars but have yet to drive any on the street
Was considers doing all my rear arms

And yes the ti hardware stretches sadly :/
I have the full SPL package front and rear. I had Fall line LCA monoball, sway bar end links, and rear toe link. Toe link is all I have remaining and it's getting replaced with SPL this week. All the SPL hardware is getting converted to stainless.
How does the setup feel on the street ?
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      02-26-2019, 01:26 PM   #9
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Quote:
Originally Posted by StripclubDJ View Post
Quote:
Originally Posted by slicer View Post
Quote:
Originally Posted by StripclubDJ View Post
What arms have you done slicer?

We have them fully on all the race cars but have yet to drive any on the street
Was considers doing all my rear arms

And yes the ti hardware stretches sadly :/
I have the full SPL package front and rear. I had Fall line LCA monoball, sway bar end links, and rear toe link. Toe link is all I have remaining and it's getting replaced with SPL this week. All the SPL hardware is getting converted to stainless.
How does the setup feel on the street ?
Great! I love it. No annoying noises and amazing handling. I don't drive the car much and never in the rain. That being said i can't comment on longevity.
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      02-27-2019, 08:12 PM   #10
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I second everything Slicer said. I too have the full SPL arms/links etc. No problems or issues either. One of my titanium bolts did strip, so I'll have to replace. That said, I do have my Fall Line Race Toe Link Kit I need to sell.
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      03-05-2019, 12:21 AM   #11
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M24 makes this part. But looks like only for a full coil over conversion and I'm betting it's spendy.

I don't know whom does it but I saw someone boxing the OEM stamped arm.
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      03-05-2019, 01:46 PM   #12
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Quote:
Originally Posted by MasterP View Post
M24 makes this part. But looks like only for a full coil over conversion and I'm betting it's spendy.

I don't know whom does it but I saw someone boxing the OEM stamped arm.
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Last edited by M43S7RO; 03-05-2019 at 01:53 PM.
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      03-05-2019, 02:39 PM   #13
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Quote:
Originally Posted by MasterP View Post
M24 makes this part. But looks like only for a full coil over conversion and I'm betting it's spendy.

I don't know whom does it but I saw someone boxing the OEM stamped arm.
I tried to buy the Aluminum lower control arm, but M24 said it's part of their GTR arm kit and they won't sell as a stand alone. Yes I'm true coilover in the rear and have all F and R arms from Bimmerworld, I also have the part the OP is inquiring about and have had zero issues.

Car barely sees street anymore tho
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      03-05-2019, 02:47 PM   #14
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Quote:
Originally Posted by M43S7RO View Post
Malek's car:

Quote:
Originally Posted by MasterP View Post
M24 makes this part. But looks like only for a full coil over conversion and I'm betting it's spendy.

I don't know whom does it but I saw someone boxing the OEM stamped arm.
Yeah that's it. I think that would be fine for me. The dimple die is a nice touch.
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      03-05-2019, 06:06 PM   #15
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Quote:
Originally Posted by MasterP View Post
M24 makes this part. But looks like only for a full coil over conversion and I'm betting it's spendy.

I don't know whom does it but I saw someone boxing the OEM stamped arm.
I tried to buy the Aluminum lower control arm, but M24 said it's part of their GTR arm kit and they won't sell as a stand alone. Yes I'm true coilover in the rear and have all F and R arms from Bimmerworld, I also have the part the OP is inquiring about and have had zero issues.

Car barely sees street anymore tho
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