67 wanders bad - Chevelle Tech
Brakes, Suspension & Steering Conversion questions & more.

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post #1 of 20 (permalink) Old Oct 20th, 19, 12:56 PM Thread Starter
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67 wanders bad

Cant tell if its these m/t front runners bad roads (or both) or if somethings wrong
Drives straight but when you hit irregularites it wants to move around..alarminly so.

Last town I lived in (nice roads)never happened. Everything is new under it..if something would cause this where should I be looking?

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post #2 of 20 (permalink) Old Oct 20th, 19, 2:39 PM
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Re: 67 wanders bad

“Bump steer”. Very common, especially if you lowered the car, installed tubular control arms (more caster), etc. Search here or google. You’ll find tons of info. I had that issue after a complete suspension change in my 69 Camaro. After correcting the suspension geometry and a good alignment we were able to eliminate most of it. BTW, Global West now makes steering knuckle arms for A bodies that are supposed to correct bump steer.


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post #3 of 20 (permalink) Old Oct 20th, 19, 5:32 PM Thread Starter
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Re: 67 wanders bad

Steering knuckle arms? Im not following
Lowered, bought some sbc ac springs cut 2 coils and had it aligned. Not a suspensino guy Ill need some help on this one.
It was pretty bad, never experienced this in all the yrs Ive had it. Cant help but wonder if these tires should be kept for track days...these are not radials or??

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post #4 of 20 (permalink) Old Oct 20th, 19, 5:51 PM
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Re: 67 wanders bad

Bias plys are hell when it comes to grooves found on normal roads. Best use them on the track only. And, address that bump steer thing. If you haven't done it yet, do a quicky measurement on your tow-in when the front end is at normal height, and then with it lifted up four or so inches. That will make you a believer.

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post #5 of 20 (permalink) Old Oct 20th, 19, 6:21 PM
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Re: 67 wanders bad

Ditch the m/t's and put some radials on the front. I ran the best Michelins in a Volkswagon size on a Camaro during the prostreet hayday. I drove that car to work every day from HB to Norwalk on the 605 for about 4 years.

I think tires are your first step to get a better steering car since you are running bias ply drag strip tires at the moment.

Getting away from the prostock look and ditching the pinner tires will help a bunch.
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post #6 of 20 (permalink) Old Oct 20th, 19, 7:25 PM
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Re: 67 wanders bad

What Name/Style/# of M/T are you running on the Front ?

I would think that a Sportsman S/R radial Tire Tread pattern would not be good IMHO

Size of Wheel and Tread pattern and Type/Softness of Tire Rubber has a lot to do with Road Noise and Feel IMHO

On my Car now
FRONT-Wheel = JEGs SportStar # 555-66062 15"x 7" BS 4” BC 5x4 ¾”
......... - TIRE = COOPER Star Fire P205/70R15 – TreadWidth 5.59” /SideWallsWidth 8"/ Dia 26.28"

NO road noise or a problem with the Feel of the Road,
no wiggly wiggly on uneven pavement or gravel roads

I do not need the Bump Steer Kit on mine as my Alignment guy said I might
if I find the old girl wondering around to much at the Track at the Start or Top End

Our Local Track at the Top End is like a Logging Road

And UMI Perf sells them
Bump Steer Kits : UMI Performance, Inc.

67 Chevelle Malibu SS Cdn
Born 283 / PG / A51
468/TH400 2,500 stall/ S60 3.70 Gs
Prev Best on M/T ET S/S #3454 street Tires/Dress 2018/05/20
60' = 1.664
1/8 = 7.532 et / 91 mph
1/4 = 11.814 et / 115 mph
NEW Best with 3,500+ Stall TC 2019/09/08
60' = 1.547
1/8 = 7.311 et / 91.76 mph
1/4 = 11.595 et / 114.28 mph


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post #7 of 20 (permalink) Old Oct 20th, 19, 7:35 PM
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Re: 67 wanders bad

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Originally Posted by cuisinartvette View Post
Steering knuckle arms? Im not following

Here’s a link:

https://www.globalwest.net/a-body-19...bumpsteer.html



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post #8 of 20 (permalink) Old Oct 21st, 19, 1:44 PM Thread Starter
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Re: 67 wanders bad

OK that makes sense thanks

Believe these are them
https://www.summitracing.com/parts/M...SABEgLBVvD_BwE

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post #9 of 20 (permalink) Old Oct 28th, 19, 12:05 PM
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Re: 67 wanders bad

Quote:
Originally Posted by cuisinartvette View Post
OK that makes sense thanks

Believe these are them
https://www.summitracing.com/parts/M...SABEgLBVvD_BwE
For the Street I would think those are way to Skinny & are Bias-Ply so not good on uneven Pavement
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67 Chevelle Malibu SS Cdn
Born 283 / PG / A51
468/TH400 2,500 stall/ S60 3.70 Gs
Prev Best on M/T ET S/S #3454 street Tires/Dress 2018/05/20
60' = 1.664
1/8 = 7.532 et / 91 mph
1/4 = 11.814 et / 115 mph
NEW Best with 3,500+ Stall TC 2019/09/08
60' = 1.547
1/8 = 7.311 et / 91.76 mph
1/4 = 11.595 et / 114.28 mph


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post #10 of 20 (permalink) Old Oct 29th, 19, 10:11 AM
 
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Re: 67 wanders bad

How much caster is in the car? "Gentle" wandering is often due to caster not being high enough. More caster is usually more better.

Darting during bumps can be caused by bump steer. Lowering the tie rod ends with a bump steer kit often helps that. Bump steer is unwanted to change during wheel travel.

Thanks for the shout out Greg!

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post #11 of 20 (permalink) Old Oct 29th, 19, 10:53 AM
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Re: 67 wanders bad

I drove framer's stock triple black 67 with bias ply's when we swapped rides and I swore NEVER EVER to use them on ANY car I had.

"Hey, is this car Jewish?" ( this was before his Jewish girlfriend) " no, what!?" " Its the wandering Jew man, its all over the road". He told me it was a bias ply characteristic. I told him he's nuts to run them . Put real radials on and report back.
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post #12 of 20 (permalink) Old Oct 29th, 19, 12:20 PM
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Re: 67 wanders bad

Bias ply tires need more toe in than radials I think. How's the toe?
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post #13 of 20 (permalink) Old Oct 29th, 19, 12:31 PM
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Re: 67 wanders bad

When I bought my 66, 23 years ago, it had bias ply tires on it. I drove it home. On that trip, I was doing 55 mph on a two lane, and it changed lanes without me turning the steering wheel. I put a set of radials on it when I got home. Problem went away. I can't believe we used to all drive on bias ply tires.
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post #14 of 20 (permalink) Old Oct 30th, 19, 7:52 AM
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Re: 67 wanders bad

I agree 100% about bias. We had a 1980 Pontiac Sunbird (the RWD one, like a Monza) and it was unsafe to drive through the Squirrel Hill tunnel in Pittsburgh back then when it was still brick. It would wander around terribly. Radial tires totally removed that trait. It came with A78-13 Bias, and I put B70-13 Radials on it. Same with our Dodge van at the time, but it wasn't as bad before
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post #15 of 20 (permalink) Old Oct 30th, 19, 9:56 AM
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Re: 67 wanders bad

I would get four Cooper Cobra 225/70R15 tires and mount them on four 15" x 7" x 4-1/4" back space Rally wheels. Then see where your at..

Call Lee and get one of there brand new 800 Series boxes in 14:1 ratio with a 30 pound valve. You will love it, if you are in decent physical shape... I feels like a real fast but easy manual box (if there ever was such a thing).. The wheel snaps right back to center after turning..

I bought these wheels to set my suspension up and I ended up liking them..

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