Autocross and Road Racing Technique There is more to life than a straight line

Teach me suspension...

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Old Apr 17, 2003 | 08:56 AM
  #1  
94BlackBowtie's Avatar
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From: Northwest GA
Teach me suspension...

For the lazy folk:
Below basically just asks what are the best suspension upgrades without pouring tons of money in it? Bang for the buck items.

For the really helpful and considerate folk:
OK guys - here's the deal - I am about to go to work on a factory 3.4 V6 Camaro...Going to put a 383 LT1 in it, along with complete LS1 front brake setup/rear end hub to hub. This is about as far as I am going to take that probably, for now at least, as I don't want this car to be a total money pit.

What I want in the end, is too sit as low as possible, and be as functional as possible. I plan on running long tubes, with Dynomax Bullets bolted to them, so there goes some ground clearance. In the looks department, I like the way the Eibach ProKit? sits these cars.

What I need to know, is what are the best things to upgrade/add? I don't know a lot about suspension, so take it easy on me. I know that I think my car handles good now, but I also know that it can handle much better. I would like to do some AutoX more so than drag racing. Driving is too much fun to go in a strait line.

I will be ruinning 18" wheels, so that will help some I know. Help out the suspension n00b!

Thanks.
Old Apr 17, 2003 | 09:07 PM
  #2  
Steve in Seattle's Avatar
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Here's what I've done to my '97 Trans Am:
------------------------------------------------------
- convertible X-brace, K-frame bracing, and hatch bracing... this was free, mine's a vert Although I know hard-top guys that use at least the X-brace and notice it ties things together a bit better.
- helmet
- Hotchkis STB (noticeable improvement on the vert )
- SFC's (I have KBDD's welded on) - night and day improvement
- LCA relocation brackets (welded on... now the LCA's point DOWN instead of UP on the axle )
-LS1 brake upgrade (w/C5 calipers). I plan on going to C5 13" rotors in the future though.
- QA1 rodends on a custom aluminum PHR (you could make this yourself most likely... it's rod ends, 2 jam nuts and an aluminium tube tapped for 3/4-16 threading. Get a 1.125" or larger OD on the tube, and 11/16" ID (which means you don't need to drill the ends... just tap/thread it ).

Here are my plans:
------------------------
- Koni SA up front, on the lower perch for 1" drop
- Bilstein 3rd gen shocks out back, w/coil isolator removed for 3/4" drop
- box in the Rear Tie Rod Brace (it runs from chasis to chasis above the PHR, just a brace really )
- C5 rotors using Bob's bracket on my stock LT1 spindles (while the LS1 spindles I have are on the TA.


Basically the goal is to lower it 1", get decent shocks, brakes and bracing on a budget. Beyond that will be a 6-pt roll bar, 12-bolt rear w/LCA brackets, maybe PHR lowering brackets, and an Eaton 800# preload posi (Torsen doesn't make a T2R for 12-botls or 9" rears... and won't, I've asked).

Oh yeah, I have a Street Twin clutch as well... and truw ZR1 wheels on the way (I'll wrap'm in Eagle F1 GS rubber for now, got a great deal on them, but I'll keep my 16" rims for Drag radials at the track, and maybe autocross... I don't know well they'd work for autocross in comparison to 315's and 275's ).
Old Apr 17, 2003 | 09:12 PM
  #3  
Steve in Seattle's Avatar
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my point?
forget the springs and just get the Koni SA's instead... then you can lower it 1" with stock springs and yank the spring isolator in the rear

I need to talk this over with Sam S. sometime, but from what guys here have said that seems to be the ticket for a moderate drop.

The other hot set-up is to get a 35mm FRONT sway bar. I know it sounds weird that this would decrease understeer (opposite of common rule of thumb), but it helps limit camber loss up front and as a result usually means MORE grip than less. The stock 19mm rear bar is fine, although some cars came with the 21mm option and could do with a 19mm bar instead.

35mm bar, Koni SA's, and Bilstein rears. that's my plan.
Old Apr 21, 2003 | 11:24 AM
  #4  
94BlackBowtie's Avatar
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Thank you Steve for the most productive and descriptive post(s)!

I was totally unaware that just some shocks could lower my car.
I would definitely like to put Koni's on it too! Thanks again for the info!
Old Apr 21, 2003 | 01:20 PM
  #5  
Dr.Mudge's Avatar
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From: Bay Area, CA
Koni SAs have this ability, I dont think the DAs do, I dont recall seeing any adjustment on my seat on the DA.
Old Apr 21, 2003 | 05:29 PM
  #6  
sleeperZragtop's Avatar
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From: Coquitlam, British Columbia
Trust me, you don't want tot sit as low as possible..check out the pics in the sig...I'm running the pro-kit and BMR lower a-arms..the total drop is 3" in the front...look how much room I have for my FLP's...none


You don't wanna spend too much money so this is the way to go...forget the pro-kit....get Hals in the front, shocks and springs....Hals in the rear, but chop the springs 1 inch...BMR has the best line for it's value..check out www.stealthperf.com Mike there is a suspension king....like myself


It really depends what you wanna do with the car...with a 383, you'll just wanna go straight....you'll need to upgrade your rear sway bar to get a good lanch.....also SFC, LCA's....the list is never done...be prepared to spend alot of money


As I did...good luck...PM if you have any question


Mike
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