Finished SC&C Touring Suspension Package Install - Chevelle Tech
Brakes, Suspension & Steering Conversion questions & more.

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post #1 of 12 (permalink) Old Mar 23rd, 20, 11:32 AM Thread Starter
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Finished SC&C Touring Suspension Package Install

I put in Hellwig bars, UMI trailing arms, double adjustable Varishocks, SPC adjustable uppers, Howe ball Joints & SPC 1" lower springs front and rear. I am doing the shakeout run after getting initial alignment using a Longacre bubble caster/camber tool and string method for toe. Caster is +5.5 camber is -3/4, Pretty certain the toe is right.

Car handles way better. I previously had the box rebuild with quick ratio and torsion bar for less assist. Going straight I expected much better snap back to straight after slight turns. It tracks nice but almost feels like toe is off. Like if i turn slightly in either direction it will want to stay that way.

Anyone else have a similar experience or must I have something off?

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post #2 of 12 (permalink) Old Mar 24th, 20, 11:05 PM
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Re: Finished SC&C Touring Suspension Package Install

I have SPC upper and lowers with roughly same alignment and an AGR quick ratio steering box. The return to center wasn't very good on mine either. It did get a bit better once the steering box wore in, which was like 1 or 2 thousand miles.

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post #3 of 12 (permalink) Old Mar 25th, 20, 10:53 AM
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Re: Finished SC&C Touring Suspension Package Install

Let the parts wear in.. Did you experiment with air pressures yet? Mine likes 39 pounds..

I got the sleeves with the flats so I could move them easier and could be able to count the flats when tweaking the alignment..
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post #4 of 12 (permalink) Old Mar 25th, 20, 11:11 AM Thread Starter
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Re: Finished SC&C Touring Suspension Package Install

that makes sense....will realign after a few hundred miles. I got the turnbuckles too. I'm running 245/45/17s. Don't you think 39 psi is too high?

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post #5 of 12 (permalink) Old Apr 7th, 20, 5:46 PM Thread Starter
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Re: Finished SC&C Touring Suspension Package Install

worn in and re aligned and 38 lbs up front....still no improvement.

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post #6 of 12 (permalink) Old Apr 7th, 20, 11:39 PM
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Re: Finished SC&C Touring Suspension Package Install

Brian, be aware that the return to center deal is not a function of the box but rather the caster. Friction in the ball joints and tie-rods interferes with the return to center deal.
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post #7 of 12 (permalink) Old Apr 8th, 20, 12:32 AM
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Re: Finished SC&C Touring Suspension Package Install

Quote:
Originally Posted by Tom Mobley View Post
Brian, be aware that the return to center deal is not a function of the box but rather the caster. Friction in the ball joints and tie-rods interferes with the return to center deal.
With 5.8 degrees of positive caster, my return to center was worse than the stock box with around 0.

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post #8 of 12 (permalink) Old Apr 8th, 20, 6:58 AM Thread Starter
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Yes I'm aware. I am going to check for friction somewhere.

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post #9 of 12 (permalink) Old Apr 8th, 20, 8:57 AM
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Re: Finished SC&C Touring Suspension Package Install

I run positive caster at +7.5 on the drivers side and +8 on the passenger side. That way I can run a slight static camber, this helps the car feel stable and predictable on the straightaway. High negative camber gets the tires catching all the grooves when going straight..

For negative camber, I run -.25 on the drivers side and -.30 passengers side.

Toe in 1/32 on both sides..

With all due respect to Tom, my experience has been the steering wheel centering after a turn is mainly in the steering box and how much assist its adding. Ever notice how much return a manual steer car has.. They only run a few degrees caster yet they snap right back.

This is on the roads I drive. Terrain is very different across this country so what ever works in the flat lands isn't going to work on the steep hills..
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post #10 of 12 (permalink) Old Apr 8th, 20, 9:06 AM Thread Starter
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Re: Finished SC&C Touring Suspension Package Install

i had better RTC before any of this work. The box was done years ago and should not be the problem. Spoke to mark at SC&C and he suggested binding ball joints or tie rods as well. that's my next check. I did check for free movement after installing them and they were fine so concerned it's not that but we'll see.

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post #11 of 12 (permalink) Old Apr 8th, 20, 9:41 AM
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Re: Finished SC&C Touring Suspension Package Install

Return to center is a function of both caster and steering box.

Brian are you running any type of wheel spacer with your setup? That will interfere with the geometry, especially of return to center. I've got the near same setup and notice my snap back isn't as tight as I want it but am running wheels spacers, so can't complain too much.

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post #12 of 12 (permalink) Old Apr 8th, 20, 9:57 AM Thread Starter
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Re: Finished SC&C Touring Suspension Package Install

Quote:
Originally Posted by Hotwire View Post
Return to center is a function of both caster and steering box.

Brian are you running any type of wheel spacer with your setup? That will interfere with the geometry, especially of return to center. I've got the near same setup and notice my snap back isn't as tight as I want it but am running wheels spacers, so can't complain too much.
No Spacers....17/8 rim, 245/45/17 4.75 backspace.

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