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Old 08-06-2018, 01:09 PM   #1
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TRW GT3 Control Arms

Price is reasonable, what is the prevailing opinion on track use?
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Old 08-06-2018, 03:31 PM   #2
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Since TRW made the "regular" Porsche LCA I would imagine these are the same way, and probably the same thing as the Porsche arms. But I have no first hand experience.
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Old 08-07-2018, 08:13 PM   #3
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TRW makes good quality parts. Definitely a go.

What price are you finding?
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Old 08-08-2018, 02:59 AM   #4
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The arm is cheap, roughly 200 each. The inner bushing/monoball is not though
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Old 08-08-2018, 03:27 AM   #5
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Thanks! Going to give them a try.
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Old 08-08-2018, 08:48 AM   #6
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+1 on TRW and beware of EBay copies which do not have part numbers. Porsche puts numbers on just about everything.
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Old 08-10-2018, 11:01 AM   #7
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Links in this thread for where to purchase would be awesome
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Old 08-10-2018, 01:25 PM   #8
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Try summit for best price. And there is a more inexpensive brand of inner bushing end on e c s tuning, no experience with it though.
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Old 08-10-2018, 01:45 PM   #9
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i did a quick add and the erp product is less $ once you add a solid thrust arm bushing and monoball end to the cost of the trw unit.
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Old 08-11-2018, 02:34 AM   #10
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Do you get the Eibach adjustable arms over there?
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Old 08-11-2018, 03:17 AM   #11
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Fcp euro for purchase. Eibach is rebranded spc unit, correct?
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Old 09-03-2018, 03:48 PM   #12
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Quote:
Originally Posted by Quadcammer View Post
The arm is cheap, roughly 200 each. The inner bushing/monoball is not though
200???? Where and how is this possible??
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Old 09-03-2018, 04:46 PM   #13
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https://www.****************************.com/products/porsche-adjustable-control-arm-99634112290insert fcp euro where the asteriks are
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Old 09-03-2018, 07:15 PM   #14
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alright....yes thank you. The inner section is not included.
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Old 09-04-2018, 05:44 AM   #15
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Do you get the Eibach adjustable arms over there?
Those are rebranded SPC control arms, so in the US we can get them as SPC control arms. I am running them on the back. The threaded cap is supposedly pre-set at the factory for the ball joint turning torque, but since I have installed them in March, I have had to tighten them up several times, they were finger tight at one point.

I have also seen several reports of the cap totally falling off. Naturally I didn't see these until after I had bought and installed mine.

Unfortunately, there is no procedure for tightening them with the arm installed on the car, you have to remove it, and spin the ball joint with a torque wrench while tightening the cap until you get the specified torque. They suggested I use loctite, which I did.

This past weekend, both of the caps became almost fully unthreaded, which I discovered on my first warm up lap on Saturday. When I rolled into the first left hand turn of the track, the back end of the car really started wandering around, it was very scary. I reduced speed (even more, as I was on a warm up lap) and prepared to pit. When I hit the second left hander, the back end started wandering ever more. It felt just like when I did some suspension work a while back and then drove to the alignment shop when my rear toe was way off. I believe that the caps were loose, which meant there was low clamping force on the ball joint and I think it moved, reducing camber and changing my toe right in the middle of the corner.

I pitted in, jacked up the rear of the car, check the caps, both were nearly off. I tightened them (with my best guess, as remember there is no approved procedure for setting the cap except with the arm removed) and marked them with silver paint and checked them after every session, and and to tighten them again on Sunday.

I've got an idea for safety wiring the caps via the grease zerk, but if that doesn't work they are going in the trash, that will be a $700 ouch but I am going to Daytona in October and if this had happened at 150+ on the banks, I might not be here writing this. They might go in the trash anyway as I am not sure I can trust them at this point and I don't want it in the back of my mind every time I am on track...
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Old 09-04-2018, 08:44 PM   #16
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I got these inners for $120 each. You just have to know where to look.

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Old 09-05-2018, 03:43 AM   #17
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Score!!!!!!!!!!!
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Old 09-05-2018, 10:02 AM   #18
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Dang.......!
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Old 10-04-2018, 12:34 PM   #19
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Those are rebranded SPC control arms, so in the US we can get them as SPC control arms. I am running them on the back. The threaded cap is supposedly pre-set at the factory for the ball joint turning torque, but since I have installed them in March, I have had to tighten them up several times, they were finger tight at one point
.....
I've got an idea for safety wiring the caps via the grease zerk, but if that doesn't work they are going in the trash, that will be a $700 ouch but I am going to Daytona in October and if this had happened at 150+ on the banks, I might not be here writing this. They might go in the trash anyway as I am not sure I can trust them at this point and I don't want it in the back of my mind every time I am on track...
The safety wiring worked, (but is kludgy) had a good weekend at Sebring with them, and I just learned that they have revised the design and there is a positive locking mechanism designed in to prevent the caps from unthreading. Outside of the cap loosening, I have been satisfied with the arms. They are going to warranty exchange my old arms for the new design, as soon as they get some of the new ones in stock. I will report back with pics when I get them.
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Old 11-08-2018, 07:28 AM   #20
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Hello Gents,

Any news on the adjustable LCA-frontier? The season is over now here in Stockholm and one of the planned Winter Projects are adjustable LCA.s.


Found those bad boys: https://www.ebay.de/itm/For-Porsche-911-Pair-Set-of-2-Front-Lower-Suspension-Control-Arms-Ball-Joints/361980347873?hash=item5447b5c5e1:g:dnIAAOSw~FJZGZW-:rk:22f:0

It states that it doesn´t fit the 986, however being 996 341 122 90 I Believe they are the correct ones, right?

So now need to find the inner part 99634144190 for a reasonable price...

Last edited by Robert986; 11-08-2018 at 07:30 AM.
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