68 Camaro convertible suspension- need help - Team Camaro Tech
Brakes, Suspension & Steering Conversion questions, Steering & Handling

 
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post #1 of 8 (permalink) Old Mar 27th, 10, 01:26 PM Thread Starter
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Nameless wonder
 
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Location: Florida
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68 Camaro convertible suspension- need help

i have a 68 camaro convertible and i will be ordering several new parts and i will be needing a little help with the suspension for a pro touring stance.

the car right now feels like its floating and the rear leafs are sagging one side lower then the other by over an inch. the car has been sitting for what feels like an eternity but i am trying very very hard to get it on the road within the next few weeks.

i already replaced the body bushings and transmission mount when i install the new 700r4 to energy suspension polys.

the parts i plan on getting will be:
summit racing brand 1 1/8th front sway bar
energy suspension sway bar end links
addco 7/8 rear sway bar
energy suspension control arm bushings
energy suspension motor mounts
summit racing brand 2" lowering leaf springs
qa1 single adjustable front coilovers

my questions:
its a 68 convertible with a 400 sbc with aluminum heads and a vortech supercharger, power steering and no A/C, what size spring should i use with the qa1 coilovers? they come in 250, 350, 450, or 550 springs.

for the rear sway bar, i plan on getting a four link in the Fall season and was wondering if i will be wasting my money if i buy this now? will i still be able to use it with the four link suspension or something similiar to the four link (i'm still undecided what direction i want to go on this). with that said, i am definitely getting the leafs now since they are sagging so badly and i cant put money towards the four link until the car is at least on the road so i can make sure everything else is working properly.

im am completely open to any suggestions, such as parts i should also add or parts i dont need etc, as i hate wasting money by buying things twice.

long term plans: four link, subframe connectors.

if i hit the lottery long term plans: full frame or new subframe and 1 piece rear frame (integrated subrframe connectors)

thanks in advance, geno

Cant seem to climb out this money pit they call Camaro
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post #2 of 8 (permalink) Old Mar 27th, 10, 04:26 PM
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Re: 68 camaro convertible suspension- need help

Search "coil spring lean" here; the driver side tilt is not always a rear spring issue, and can actually be a problem with the front coil. A thin spacer/poly isolator up front can level it out.

You can also search "poly bushings" and get lots of info on the pros and cons of using poly control arm bushings. Ditto the engine mounts. Some like them, some think they are too harsh; there are also better alternatives (Delrin) for some locations.

Lots of great handling info on David Pozzi's site, www.pozziracing.com . Rear anti-roll bar is not always a good idea, depending on the rest of the setup.

David's site also explains the Guldstrand mod, which you may want to do, or opt for a nice set of adjustable upper control arms like the SC&C arms.

Likewise, a search for "QA1" here will bring up lots of discussions. The OE front spring rate for the softest 1st gen coils is around 327 lb-in, so you would likely not want to use the 250s. The rest of the choices would be usable, but you have to decide how ifrm you want the ride.

Are the front and rear subframes tied on your car? Really stiff springs and a stiff (large diameter) anti-roll bar tend to really shake up a 1st gen vert without subframe connectors and with rubber subframe bushings.

Eric
69 'vert project big block/TKO 600 RR
68 'vert driver RS clone -- gone!
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post #3 of 8 (permalink) Old Mar 28th, 10, 01:28 PM
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Re: 68 Camaro convertible suspension- need help

If you are going to do a rear bar, get a matched set front and rear. And don't most come with end links? I haven't looked at the summit one, but most do.
If you really are going to do the 4 link, skip the rear bar for now, the 4 link is not likely to work one not made for it.

I would put subframe connectors high on the list. Does your vert have the x-brace? Get one if not. Hotchkis has both and they get very high marks on here.

I recommend the 550 inch pound springs, I have hotchkis (602# and like them)
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post #4 of 8 (permalink) Old Mar 28th, 10, 01:32 PM
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John
 
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Re: 68 Camaro convertible suspension- need help

The Summit bar has black poly bushings and end links.
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post #5 of 8 (permalink) Old Mar 28th, 10, 07:56 PM Thread Starter
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Nameless wonder
 
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Re: 68 Camaro convertible suspension- need help

im going to skip the rear swaybar. i really researched the rear ends i was curious about and neither one needs a sway bar. i was looking at the watts link or the truckarms. neither one needs it after install, so rear sway bars are out of the question now.

john68, did you purchase the summit bar? if so, did make any difference? and are you sure it comes with end links, because summit's website doesnt mention them at all. i dont want to spend money if i dont have to. guess ill call and ask if i dont hear from you first.

eric, thanks for chiming in.
-rear leafs are sagging, i can litterally see where it is sagging so its not a question of where or what spring is doing it. i know the rears have to be changed.
-the guldstrom mod: i will be getting tubular arms to remedy the caster problem. depending on how things go i might even just get a new vette style front end, but im not really thinking about that until this winter.
-i do not currently have subframe connectors. i wont be getting any until i am fully sure of what permanent rear suspension i will be getting (either watts link 3 link, or truckarms). after i put one of these in its staying in, then ill build around them.

basically, im looking for something to ride decent for the summer while i dial in my new blower motor.

thanks for everyone that wrote back. i appreciate you taking the time

Cant seem to climb out this money pit they call Camaro
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post #6 of 8 (permalink) Old Mar 29th, 10, 03:12 AM
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John
 
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Re: 68 Camaro convertible suspension- need help

Yes I have the Summit front 1 1/8 bar comes with all mounting hardware,
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post #7 of 8 (permalink) Old Mar 29th, 10, 11:06 AM Thread Starter
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Nameless wonder
 
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Re: 68 Camaro convertible suspension- need help

Quote:
Originally Posted by john68 View Post
Yes I have the Summit front 1 1/8 bar comes with all mounting hardware,
one less thing i have to buy. thanks.

Cant seem to climb out this money pit they call Camaro
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post #8 of 8 (permalink) Old Mar 30th, 10, 08:54 AM
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Russ
 
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Re: 68 Camaro convertible suspension- need help

The Hotchkiss subframe connectors and X brace really helped on my 68 vert. The OE X brace was long gone when I got the car so I had no idea how important it was.

I guess my car is mainly a resto-mod. I'm running Hotchkiss springs F+R, their front sway bar, and no rear bar. Most of my friends cannot believe how well an "old car" can handle.

Russ (RJ)
The Garlic Capital, Gilroy,CA

(sold June 15,2014) 1968 RS convertible that is not quite stock

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