Drag Racing Tech
Sponsored by:
Sponsored by:

LCA angle how critical is it?

Thread Tools
 
Search this Thread
 
Old Sep 20, 2011 | 10:19 PM
  #1  
355z28's Avatar
Thread Starter
10 Second Club
15 Year Member
iTrader: (8)
 
Joined: Oct 2007
Posts: 1,251
Likes: 4
From: Iowa
Default LCA angle how critical is it?

I dont have relocation brackets on my car and I was looking at them and they actually run up hill from the body to the rear (the control arm is higher at the rear then it is on the body)

Ive read they are suppose to be level to the ground or run slightly down to the rearend. Is this true? Having it the way it is affects what on my car?

Thanks
Austin
Reply
Old Sep 20, 2011 | 11:03 PM
  #2  
brandonppr's Avatar
TECH Fanatic
20 Year Member
iTrader: (9)
 
Joined: Nov 2004
Posts: 1,690
Likes: 4
From: Tennessee
Default

Originally Posted by 355z28
I dont have relocation brackets on my car and I was looking at them and they actually run up hill from the body to the rear (the control arm is higher at the rear then it is on the body)

Ive read they are suppose to be level to the ground or run slightly down to the rearend. Is this true? Having it the way it is affects what on my car?

Thanks
Austin
If the rear is higher than the front then when you take off the rear goes up and the tires lift up and the body drops down. Which means spinning/wheel hop.

If the front is higher than the rear then when you take off the rear is pushed down and this pushes the tires into the ground harder which give you better traction.

There is a balance though. When its set up right you will have best traction, but you defintley don't want it how you have it for drag racing.


imagine trying to jump on a trampoline. If you just pick you legs up you don't get off the ground. This is what its like the way you have it. But if you push down the right amount you will get the highest off the trampoline. This is what it would be like if it was the other way.

Last edited by brandonppr; Sep 20, 2011 at 11:09 PM.
Reply
Old Sep 21, 2011 | 07:51 AM
  #3  
Fireball's Avatar
TECH Senior Member
20 Year Member
iTrader: (21)
 
Joined: Nov 2001
Posts: 8,484
Likes: 0
From: Cecil County Raceway!!!
Default

absolutely critical...need them to run downhill about 2deg.
Reply
Old Sep 21, 2011 | 08:37 AM
  #4  
Heyfred's Avatar
TECH Regular
15 Year Member
iTrader: (10)
 
Joined: Sep 2008
Posts: 473
Likes: 12
From: Woodinville, WA.
Default

One of the key points of making your car work.
Need more info:
Front and rear tire diameter?
Measurement from ground to fender well lip, front and rear?
Tunnel mount torque arm?
Reply
Old Sep 21, 2011 | 09:24 AM
  #5  
355z28's Avatar
Thread Starter
10 Second Club
15 Year Member
iTrader: (8)
 
Joined: Oct 2007
Posts: 1,251
Likes: 4
From: Iowa
Default

Im not sure on the rear measurement they're stock springs.

Front tires 25.5"
front ground to lip 27"
Rear tires 28" tall MT Dr's

Full lenth TA relocated off trans

When people say the car needs to be level for pinion angle, where do take your level measurement from, does the car need to be level to set the control arms? Because naturally my car has a rake or stance to it with the tire combination and lover in the front.

Thanks a lot guys
Reply
Old Sep 21, 2011 | 09:30 AM
  #6  
Heyfred's Avatar
TECH Regular
15 Year Member
iTrader: (10)
 
Joined: Sep 2008
Posts: 473
Likes: 12
From: Woodinville, WA.
Default

Rear shocks, stock or aftermarket?
Reply
Old Sep 21, 2011 | 09:39 AM
  #7  
355z28's Avatar
Thread Starter
10 Second Club
15 Year Member
iTrader: (8)
 
Joined: Oct 2007
Posts: 1,251
Likes: 4
From: Iowa
Default

QA1 12 way single adjustable
Reply
Old Sep 21, 2011 | 10:09 AM
  #8  
Heyfred's Avatar
TECH Regular
15 Year Member
iTrader: (10)
 
Joined: Sep 2008
Posts: 473
Likes: 12
From: Woodinville, WA.
Default Lca

Can you send me pictures of your setup.
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

 Pouria Savadkouei
story-1

Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

 Verdad Gallardo
story-2

7 Most Reliable High-Performance Engines GM Has Ever Built

 Verdad Gallardo
story-3

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-4

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-5

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-6

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-7

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-8

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-9

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
Old Sep 21, 2011 | 10:41 AM
  #9  
355z28's Avatar
Thread Starter
10 Second Club
15 Year Member
iTrader: (8)
 
Joined: Oct 2007
Posts: 1,251
Likes: 4
From: Iowa
Default

The cars on jack stands right now replacing head gaskets. I'll post some never week. What are you wanting pictures of?

The fronts about 1/2 Inch lower now.
Reply
Old Sep 21, 2011 | 10:57 AM
  #10  
Heyfred's Avatar
TECH Regular
15 Year Member
iTrader: (10)
 
Joined: Sep 2008
Posts: 473
Likes: 12
From: Woodinville, WA.
Default

With the 8.8, are you using the stock torque? Did you weld the 10 bolt LCA mounts on to the 8.8?
Reply
Old Sep 21, 2011 | 12:04 PM
  #11  
AChotrod's Avatar
11 Second Club
iTrader: (17)
 
Joined: Jul 2008
Posts: 9,896
Likes: 1
From: Chicago area
Default

I just moved mine to the middle hole on the LCA brackets and they still slope up towards the front. I think in the bottom hole they were to low in the rear.

Reply
Old Sep 21, 2011 | 12:29 PM
  #12  
355z28's Avatar
Thread Starter
10 Second Club
15 Year Member
iTrader: (8)
 
Joined: Oct 2007
Posts: 1,251
Likes: 4
From: Iowa
Default

Originally Posted by Heyfred
With the 8.8, are you using the stock torque? Did you weld the 10 bolt LCA mounts on to the 8.8?
The 8.8 is with a stock torque arm, stock width and is running the 10 bolt tubes in the 8.8 housing. I called ws6 store Im going to try their rpmspeed brand bolton LCA brackets,
Reply
Old Sep 22, 2011 | 04:31 PM
  #13  
fenton06's Avatar
12 Second Club
15 Year Member
iTrader: (1)
 
Joined: Oct 2007
Posts: 277
Likes: 0
Default

I would just order the BMR weld on ones from Summit, they're cheap ($70ish last I checked) I wouldn't be caught dead bolting **** to my suspension!

Car is looking sexy, what have you been racing lately?

And to answer your question, yes, you need the LCARBs so you can get the LCA to run downhill front to back. Bottom hole is probably your best bet. To measure pinion angle you'll want the equivalent of a 4 post lift so you can adjust it while the suspension is loaded. I'm planning on making wooden boxes the size of milk crates to place under the tires so I can get under the car.
Reply
Old Sep 22, 2011 | 05:24 PM
  #14  
AChotrod's Avatar
11 Second Club
iTrader: (17)
 
Joined: Jul 2008
Posts: 9,896
Likes: 1
From: Chicago area
Default

Or he can do what I did in the pic. Use 4 ramps. Also forget the DS when measuring PA. use the engine or trans and rear bracket on the TA.

Funny you say that since your entire car is just bolted together including the engine, trans, suspension etc..
Also you can weld on the bolt on brackets at a later date if you dont have a welder handy.
Reply
Old Sep 28, 2011 | 05:49 PM
  #15  
ls3yeager's Avatar
Teching In
iTrader: (1)
 
Joined: Aug 2011
Posts: 19
Likes: 0
Default

foundersperformance.com sales them for $46
Reply




All times are GMT -5. The time now is 08:43 AM.

story-0
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

Slideshow: We take a close look at the ONE and Artidiag 800BT2 diagnostic tools from Topdon and the reasons to buy one over the other.

By Pouria Savadkouei | 2026-05-28 11:05:11


VIEW MORE
story-1
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

Slideshow: The controversial Ferrari F6 swaps its original flat-12 for a Corvette Z06-derived LT4 V8 and sends power to four rear wheels through a custom-built drivetrain.

By Verdad Gallardo | 2026-05-26 18:23:54


VIEW MORE
story-2
7 Most Reliable High-Performance Engines GM Has Ever Built

Slideshow:These GM engines didn't just make huge power, they survived abuse, boost, track days, and six-digit mileage with a reputation for refusing to quit.

By Verdad Gallardo | 2026-05-21 16:45:27


VIEW MORE
story-3
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-4
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-5
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-6
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-7
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-8
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-9
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE