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Old 12-18-2020, 05:32 PM   #1
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Full Suspension Design/Build/Install

Merry Christmas everyone!! I wanted to document my suspension update for anyone interested with the parts I have built and decided to start this thread to separate it from my LCA discussion as there will be a bunch of parts other than the LCAs that are going to be installed that I will also share. For transparency, the parts I will install have all been modeled with detailed drawings by myself, taking reference dimensions from the car, OEM parts, a few aftermarket parts, and machined working with buddies’ in their shops. A few parts are still to be built.

I will note materials used, if anyone is inclined to know about that stuff. All parts have been subjected to FEA through Solidworks simulations to analyze potential functional loads on various load axes/directions. I won’t go into detail as any given part will have many scenarios simulated.

The inner monoballs and outer arms are machined from 7075-T6 with the outer modeled after the OEM 996 adjustable LCA. Bearings are Teflon lined FK COM12T with F1 fit. Bushings are 4340 with metric grade 10 fasteners with the outer bolt upsized to 14mm. Grade 12.9 threaded rod is permanently Loc-tited into the monoball end with M8 jet nuts connecting the inner and outers with 6061 aluminum spacers to increase arm length and also take up threaded rod extension. All aluminum is hard anodized.

Both bearings are interference press fit and utilize bearing retaining compounds and heavy-duty Spiro-loc type internal snap rings.

Here are some shots of the installed arms from various perspectives.








Here is a shot using an adjustable hand reamer to enlarge the upright hole to accommodate the 14mm fastener. I could have bought a 14mm drill with a shank small enough to fit a hand drill but had this and it sufficed fine. The family was not happy having to pick aluminum shavings out of the pizza.



Adjustable hand reamer set.


Last edited by P_Carfahrer; 12-18-2020 at 05:34 PM.
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Old 12-20-2020, 09:11 AM   #2
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Wow outstanding work!!!!
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Old 12-21-2020, 06:56 AM   #3
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dood.... you always impress.
BEAUTIFUL!!!
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Old 12-26-2020, 04:08 PM   #4
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Some other parts ready to install after anodization.

Pinch style toe arms, tie rods, and toe lockouts. Arms are again 7075-T6 with 17-4 stainless spacers and cone inserts. Toe lockouts are 4340. Rod ends are FK JMX/L 10T with F1 fit. Grade 10/10.9 hardware with ARP 12 point screws for the pinch point.







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Old 01-17-2021, 04:46 PM   #5
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Parts anodized and installed. Thrust arm forks built. Working on the thrust arm center links.














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Old 01-18-2021, 07:02 AM   #6
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Wow nice stuff!
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Old 01-18-2021, 04:16 PM   #7
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Wow nice stuff!
Yeah! +10000000000
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Old 02-23-2021, 05:44 PM   #8
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Very Nice!!

Are you going to be selling these?
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Old 02-25-2021, 06:21 AM   #9
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I'd be interested in lower control arms that had raised ball joints to allow you to lower the car without effecting the roll center (you'd be able to lower the car more without the control arms pointing up). These are common on older 911s but no one is making them for newer 911s...yet.
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Old 03-09-2021, 08:22 PM   #10
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I'd be interested in lower control arms that had raised ball joints to allow you to lower the car without effecting the roll center (you'd be able to lower the car more without the control arms pointing up). These are common on older 911s but no one is making them for newer 911s...yet.

Porsche offers tapered studs of varying lengths to accomplish this in their racing parts catalog though I can’t seem to find where I had the document saved.

Once I get everything buttoned up I will play around with making some tapered bushings of different neck lengths and longer bolts to lower the upright attachment point to improve roll center geometry.
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Old 03-10-2021, 09:49 AM   #11
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Porsche offers tapered studs of varying lengths to accomplish this in their racing parts catalog though I can’t seem to find where I had the document saved.

Once I get everything buttoned up I will play around with making some tapered bushings of different neck lengths and longer bolts to lower the upright attachment point to improve roll center geometry.
Keep us posted I would be interested in a set if they can improve the roll center.
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Old 04-09-2021, 04:52 PM   #12
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Finished some thrust arm center links and am finalizing rear monoball mounts with an adapter plate to facilitate mounting the Ohlins coilovers.

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Old 05-25-2021, 07:26 PM   #13
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Holy Good golly my friend!
BEAUTIFUL work!
Incredible.
Truly.

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Old 06-21-2021, 02:51 PM   #14
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Ready for install...



Setting spring pre-load by myself was a royal pain. I couldn't keep the assembly fixed to turn the nut for the last few millimeters

I kind of wish I had not installed anything yet and put everything out together for a full build picture.

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Old 06-21-2021, 03:53 PM   #15
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You need some helper springs. No need to preload the mains. You still need to set ride height.

Is there anything you can't reverse engineer ... better than the original?

Everything looks great.
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Old 06-21-2021, 05:28 PM   #16
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You need some helper springs. No need to preload the mains. You still need to set ride height.

Is there anything you can't reverse engineer ... better than the original?

Everything looks great.
No. The answer is no: nothing he can't improve on.
Beautiful work!

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Old 06-23-2021, 12:16 PM   #17
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You need some helper springs. No need to preload the mains. You still need to set ride height.

Is there anything you can't reverse engineer ... better than the original?

Everything looks great.
Ohlins kit for the Boxster only has the main spring. Height is adjusted with the nut riding on top of the hub upright.

I should come down to your garage at the track for the MaxD ride height, alignment, and corner balance special.
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Old 06-27-2021, 12:41 PM   #18
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A few installation pictures..



1/4” anti-dive thrust setup



1/4” anti-squat setup








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Old 08-25-2021, 02:47 PM   #19
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Intall and alignment are completed with 245/40 and 275/35 Hankook RS-4s mounted on Cayman S II wheels Hyperdipped black. Ready for first track event at the PCA event at Utah Motorsports Campus on 9/11.

Car is set at -3.2F and -2.8r and is a blast driving through the canyons and mountain passes in my area. I can't wait to get it on the track.


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Old 08-26-2021, 09:50 AM   #20
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Nice stand, your car looks awesome!
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