09-12-2018, 11:24 PM
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#1
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Pathological Tinkerer
Join Date: Mar 2017
Location: Utah
Posts: 197
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GT3 LCA Build
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09-13-2018, 09:33 AM
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#2
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Registered User
Join Date: Sep 2009
Location: toronto
Posts: 2,668
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Nice work man! Don't forget the Litronic linkage.....some may want that.
For something like this, folks will want to see loads of testing..
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986 00S
Last edited by jaykay; 09-13-2018 at 09:36 AM.
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09-13-2018, 11:05 AM
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#3
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Certified Boxster Addict
Join Date: Nov 2010
Location: Los Angeles
Posts: 7,669
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Very cool! I love innovation and someone trying do something new.
With that being said, have you done a cost breakdown yet? Materials + machining setup & hours + quality checks/inspection + assy + etc, etc.
I would send out the drawings to machine shops to get formal quotes (not estimates or ROM's, but real quotations) before investing much more time into anything. In my experience, I am always surprised at the (high cost) quotes that I get back.
__________________
1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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09-13-2018, 11:21 AM
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#4
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Registered User
Join Date: Apr 2010
Location: Canada
Posts: 3,149
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09-13-2018, 01:23 PM
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#5
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Pathological Tinkerer
Join Date: Mar 2017
Location: Utah
Posts: 197
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A more custom or radical LCA design for the build was something I was not prepared to do from a time and testing perspective. Maybe after successfully building these a tube syle could be possible.
For this reason the inner/outer are modeled directly from the stock GT3 LCA dimensions to leverage Porsche factory engineering with the only difference being a larger 14mm spherical bearing in both ends. Fasteners will be 12.9 grade. 4340 spacers will be hardened.
From a cost view I am designer, machinist for the simpler parts (thrust bushing/monoball spacers), and assembler. Both my next door neighbor and my best friend's brother both own local machining shops where we will build the inners/outers for a few cases of beer and pizza.
I will also model different thickness spacers when I get my hands on a stock one to get the profile dimensions. Do any of you have knowledge of what the most useful thicknesses would be?
Jay, to incorporate a Litronic sensor, wouldn't one just need to get the a Litronic spacer?
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09-13-2018, 04:53 PM
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#6
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Registered User
Join Date: Dec 2016
Location: Clifton, NJ
Posts: 1,135
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Quote:
Originally Posted by The Radium King
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Im installing a set of these right now. Nice pieces with endless adjustment
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09-19-2018, 04:27 PM
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#7
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Pathological Tinkerer
Join Date: Mar 2017
Location: Utah
Posts: 197
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12-18-2018, 09:53 AM
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#8
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Registered User
Join Date: Feb 2017
Location: Stockholm
Posts: 375
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Quote:
Originally Posted by Quadcammer
Im installing a set of these right now. Nice pieces with endless adjustment
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Nice stuff, but what the heck do they mean by: " this no compromise design the center geometry can also be adjusted to correct for lower ride heights."
On McPherson, when ride hight is lowered beyond the point where the LCA are vertical you will get a positiv (not good) effect on camber, also the roll center will become higher.
How will those Tarrett control arms compensate for that, Idonīt see that it is possible.
Educate me..
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12-18-2018, 02:03 PM
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#9
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Registered User
Join Date: Sep 2009
Location: toronto
Posts: 2,668
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Quote:
Originally Posted by Robert986
Nice stuff, but what the heck do they mean by: " this no compromise design the center geometry can also be adjusted to correct for lower ride heights."
On McPherson, when ride hight is lowered beyond the point where the LCA are vertical you will get a positiv (not good) effect on camber, also the roll center will become higher.
How will those Tarrett control arms compensate for that, Idonīt see that it is possible.
Educate me.. 
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I believe they are referring to roll centre. I have not reviewed the component or its adjustments but you would have to be able to change the position pivot (up or down) points to affect roll centre position.
No one ever talks about this adjustment but theoretically it will have a massive influence on a vehicles handling during cornering as it is essentially the roll axis of the vehicle. Its position relative to the CG is what is critical. You want to aim the arm such that the roll centre is closer to the CG. This will yield a reduced roll moment.
Edit: I just had a look and they do mention roll centre at the very end of the description; I cant quite see but I would think the pivot position adjustment would some how be incorporated at the outboard end with a spacer of some sort
__________________
986 00S
Last edited by jaykay; 12-18-2018 at 02:12 PM.
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10-25-2019, 01:41 PM
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#10
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Pathological Tinkerer
Join Date: Mar 2017
Location: Utah
Posts: 197
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Long over due update.
I am getting close. Everything is done but the inner bearing housing. Starting to cut them this weekend hopefully.
Outers/Inners are 7075-T651 with FK Com12T-F1 spherical bearings. All bushings are 4340 which along with fasteners I will nickel/cobalt plate and relief bake. The outers are modeled directly from stock 996 GT3 arms incorporating spherical bearings with one additional stiffening rib on the under side between the thrust bushing and bearing bore. Outers will be hard anodized black with the inners hard anodized red and blue.
Outers incorporate 14mm hardware.
Shims are hard anodized 6061 aluminum.
Thrust bushings are hard anodized red/blue and have 1/4" drive holes to use to rotate the bushings for caster adjustment.
Some pics.
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12-05-2018, 07:09 PM
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#11
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Pathological Tinkerer
Join Date: Mar 2017
Location: Utah
Posts: 197
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Finally getting some parts built. 1mm, 2mm, and 3mm shims waterjetted and now needs deburring and anodizing. 10mm and 15mm sheets going on next week with 5mm, 7mm, and 8mm to follow.
I sourced decent sized metric sheets to cut and have quite a few shims after anodizing if anyone needs some cheap.
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12-17-2018, 05:48 PM
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#12
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Pathological Tinkerer
Join Date: Mar 2017
Location: Utah
Posts: 197
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More shims...
15mm, 10mm, and 8mm...
Spherical bearing insert adapter bushings starting next week..
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12-18-2018, 10:01 AM
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#13
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Registered User
Join Date: Apr 2010
Location: Canada
Posts: 3,149
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not sure, but if your camber is controlled by extending/retracting the control arm, then you can use the inner eccentric to raise/lower the control arm inboard attachment point to compensate for changes in coil over length.
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12-18-2018, 01:27 PM
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#14
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Registered User
Join Date: Dec 2016
Location: Clifton, NJ
Posts: 1,135
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they may also be referring to the use of shims to control anti-dive/squat on the diagonal control arms. perhaps some marketing fluff in there
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11-02-2020, 02:36 PM
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#15
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On the slippery slope
Join Date: Mar 2014
Location: Austin and Palm Springs
Posts: 3,798
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WOW!!! Looks great
Are you going to sell them?
__________________
2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY
2004 996 Targa Tip
Instructor - San Diego region
2014 Porsche Performance Driving School
2020 BMW X3, 2013 Ram 1500, 2016 Cmax, 2004 F-150 "Big Red"
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11-02-2020, 02:56 PM
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#16
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Pathological Tinkerer
Join Date: Mar 2017
Location: Utah
Posts: 197
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Quote:
Originally Posted by JayG
WOW!!! Looks great
Are you going to sell them?
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Jay, I have a couple sets to sell as I always make extras and made some for some friends' cars also but they now no longer have the need of them.
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11-03-2020, 08:49 AM
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#17
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Registered User
Join Date: Dec 2009
Location: Orange County, CA
Posts: 1,981
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Quote:
Originally Posted by P_Carfahrer
Jay, I have a couple sets to sell as I always make extras and made some for some friends' cars also but they now no longer have the need of them. 
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Carfahrer,
Beautiful pieces, how much would you sell a set of these for?
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11-03-2020, 12:08 PM
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#18
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Pathological Tinkerer
Join Date: Mar 2017
Location: Utah
Posts: 197
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Quote:
Originally Posted by Gilles
Carfahrer,
Beautiful pieces, how much would you sell a set of these for?
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Gilles,
Let me get them on the car in the next weeks to verify final fitment/instructions and I will message you.
Please note the LCA has a 14mm bolt for the upright connection which likely will require a little clearancing. This replaces the OEM 12mm stud which has a backcut on the threads and is a known weak failure point. A friend of mine tore up his 996 cup left front when this stud broke last year on his car.
Here are a couple of pics of the caster fork on the LCA.
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11-03-2020, 03:08 PM
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#19
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Who's askin'?
Join Date: Mar 2018
Location: Utah
Posts: 2,448
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DOOOOOOOOD.......
So Beautiful!!!
(and don't think I don't know who you were tlaking about when you said you built a set for a friend who no longer needs them..... hahahaha)
However: Onethenaton; he NEEDS A SET OF THESE. He TOTALLY needs a set of these.
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11-03-2020, 07:54 AM
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#20
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01 Seal Gray 986 S
Join Date: Sep 2019
Posts: 167
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amazing craftsmanship!
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