Rear lca for autocross? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

bleox · 09-19-2016, 08:40 AM

Okay so I called an alignment shop in Glendora CA and they recommend me the spl lca... But im curious if their is a cheaper alternative.... and clearly stated that he didn't recommend the spc lca any opinions?! Thanks in advance

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smg1138 · 09-19-2016, 09:21 AM

What class are you running in? Some LCA's aren't legal for certain classes.

Shankenstein · 09-19-2016, 09:42 AM

I don't believe there are any recalls or major issues with SPC's rear lower control arm. Plenty of serious drivers use them.

It's designed similar to the OE arm with a slot and eccentric bolt. Personally, I like the design for daily drivers and salty environments. Rod ends (heim joints) are tough to do engineer properly/reliably (just check Velox's development thread).

Also, if you need more than 2 degrees of adjustability in either direction (beyond the natural camber that you get from lowering the car), the SPC arms aren't the best choice. Whiteline is good for ~2.5 degrees. If you plan to have limited travel, go with Stance or Voodoo13. Otherwise, SPL, ISC, Velox, and Cusco are great options.

Since your title refers to autocross... SCCA C-street doesn't allow this modification, but STX class does (as long as you're using a rubber/urethane outer bushing). I can't speak for other autocross organizations.

smg1138 · 09-19-2016, 09:56 AM

I use the newest Whiteline LCA and have no complaints. It's basically the same as the SPC, but the bushing is legal for STX class. It does everything I need it to do.

wparsons · 09-19-2016, 09:56 AM

I think SPC and Racer X (if you get the bushing instead of the heim joint) are the only STX legal LCA's?

strat61caster · 09-19-2016, 10:38 AM

Velox has a urethane rod end for stx legality. And iirc there's one more, maybe rsr that has the right rod end.

The off the shelf SPC lca isn't technically legal as it's a lubricated spherical bearing in a rubber joint and it has to be pressed out and replaced with a legal bushing. Only a pedant would call you on it though, go for it and spend the money to replace it if you start gunning for nationals.

bleox · 09-19-2016, 10:49 AM

I'm running stx on scca .... And no I don't need a crazy amount of camber... It was what ever the shop needed for camber while they did their tune....

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bleox · 09-19-2016, 01:36 PM

So to stay in stx I need a urethane style rod end?

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whataboutbob · 09-19-2016, 01:57 PM

Quote:

Originally Posted by bleox

So to stay in stx I need a urethane style rod end?

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Read up on the rules here: http://cdn.growassets.net/user_files...pdf?1458856541

You can't have spherical in STX. There are also other constraints in the rules.

finch1750 · 09-19-2016, 02:20 PM

The list here denotes stx legal LCAs

http://www.ft86club.com/forums/showthread.php?t=103609

bleox · 09-19-2016, 02:31 PM

Quote:

Originally Posted by finch1750

The list here denotes stx legal LCAs

http://www.ft86club.com/forums/showthread.php?t=103609

Beautiful post all the info I need... like how u listed the ones that are stx compatible

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BR-ZED · 04-01-2018, 08:56 AM

Quote:

Originally Posted by whataboutbob

Read up on the rules here: http://cdn.growassets.net/user_files...pdf?1458856541

You can't have spherical in STX. There are also other constraints in the rules.

Old thread, but any restrictions on LCA for SM class? That's my eventual destination :-)

whataboutbob · 04-02-2018, 03:30 PM

Quote:

Originally Posted by BR-ZED

Old thread, but any restrictions on LCA for SM class? That's my eventual destination :-)

I'd advise you to read the rules here: https://www.scca.com/downloads/40392...duced/download

The SM rules start on page 180.

09-19-2016, 08:40 AM	#1
bleox Member Join Date: Nov 2014 Drives: 2015 Subaru brz Location: menifee ca Posts: 91 Thanks: 9 Thanked 12 Times in 5 Posts Mentioned: 0 Post(s) Tagged: 1 Thread(s)	Rear lca for autocross? Okay so I called an alignment shop in Glendora CA and they recommend me the spl lca... But im curious if their is a cheaper alternative.... and clearly stated that he didn't recommend the spc lca any opinions?! Thanks in advance Sent from my iPhone using Tapatalk

09-19-2016, 09:42 AM	#3
Shankenstein Frosty Carrot Join Date: Jan 2013 Drives: The Atomic Carrot Location: Baltimore, MD Posts: 513 Thanks: 272 Thanked 428 Times in 199 Posts Mentioned: 19 Post(s) Tagged: 0 Thread(s)	I don't believe there are any recalls or major issues with SPC's rear lower control arm. Plenty of serious drivers use them. It's designed similar to the OE arm with a slot and eccentric bolt. Personally, I like the design for daily drivers and salty environments. Rod ends (heim joints) are tough to do engineer properly/reliably (just check Velox's development thread). Also, if you need more than 2 degrees of adjustability in either direction (beyond the natural camber that you get from lowering the car), the SPC arms aren't the best choice. Whiteline is good for ~2.5 degrees. If you plan to have limited travel, go with Stance or Voodoo13. Otherwise, SPL, ISC, Velox, and Cusco are great options. Since your title refers to autocross... SCCA C-street doesn't allow this modification, but STX class does (as long as you're using a rubber/urethane outer bushing). I can't speak for other autocross organizations. __________________ If you think you're nerd enough, join in the discussions about Suspension and Aerodynamic modelling! Wall of Fame - JDL Auto Design, Raceseng, Vishnu Tuning, Penske Shocks, Nameless, Perrin, RaceComp Engineering, Essex/AP Racing, Verus, RacerX Wall of Shame - aFe Takeda, Wilwood, FA20Club

09-19-2016, 02:20 PM	#10
finch1750 Undisputed El Presidente Join Date: Jun 2012 Drives: Zenki 37J ZN6 Location: Stockton, CA Posts: 11,571 Thanks: 9,382 Thanked 9,397 Times in 5,261 Posts Mentioned: 374 Post(s) Tagged: 33 Thread(s)	The list here denotes stx legal LCAs http://www.ft86club.com/forums/showthread.php?t=103609 __________________ "Just like how a strut bar somehow enables you to corner 20MPH faster around a cloverleaf on-ramp, when the reality is, you can do it already but you just don't have to balls to do it." - CSG David

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09-19-2016, 09:21 AM	#2
smg1138 Senior Member Join Date: Jan 2014 Drives: 2013 Raven FR-S Location: Nashville Posts: 775 Thanks: 968 Thanked 213 Times in 136 Posts Mentioned: 3 Post(s) Tagged: 2 Thread(s)	What class are you running in? Some LCA's aren't legal for certain classes.

09-19-2016, 09:56 AM	#4
smg1138 Senior Member Join Date: Jan 2014 Drives: 2013 Raven FR-S Location: Nashville Posts: 775 Thanks: 968 Thanked 213 Times in 136 Posts Mentioned: 3 Post(s) Tagged: 2 Thread(s)	I use the newest Whiteline LCA and have no complaints. It's basically the same as the SPC, but the bushing is legal for STX class. It does everything I need it to do.

09-19-2016, 10:49 AM	#7
bleox Member Join Date: Nov 2014 Drives: 2015 Subaru brz Location: menifee ca Posts: 91 Thanks: 9 Thanked 12 Times in 5 Posts Mentioned: 0 Post(s) Tagged: 1 Thread(s)	I'm running stx on scca .... And no I don't need a crazy amount of camber... It was what ever the shop needed for camber while they did their tune.... Sent from my iPhone using Tapatalk

09-19-2016, 01:36 PM	#8
bleox Member Join Date: Nov 2014 Drives: 2015 Subaru brz Location: menifee ca Posts: 91 Thanks: 9 Thanked 12 Times in 5 Posts Mentioned: 0 Post(s) Tagged: 1 Thread(s)	So to stay in stx I need a urethane style rod end? Sent from my iPhone using Tapatalk

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