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adjusting bumpsteer A body
#1388386
02/16/13 01:19 PM
02/16/13 01:19 PM
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Joined: Jan 2007
Posts: 8,124
Mt Morris Michigan
mopar dave
OP
master
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OP
master
Joined: Jan 2007
Posts: 8,124
Mt Morris Michigan
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anyone know of a bump steer kit for A body?
don't want to spend 350 on hotchkis tie rods.
Last edited by mopar dave; 02/16/13 01:25 PM.
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Re: adjusting bumpsteer A body
[Re: mopar dave]
#1388387
02/16/13 02:04 PM
02/16/13 02:04 PM
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Joined: Mar 2007
Posts: 3,301
West Coast, USA
jbc426
master
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master
Joined: Mar 2007
Posts: 3,301
West Coast, USA
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I don't think simply swapping in those tie rods will change your bump steer. Hotchkis makes an upper control arm that moves the piviot point upwards on the rear of the control arm, but it's expensive.
It's supposed to better match the sweep radius of the lower control arm's travel from full compression to full rebound, to the sweep radius of the outer tie rod end's sweep radius during full compression to full rebound. I'm no expert, but my stock suspension doesn't bump steer that bad at all. I did have to massage a few things to get them lined up to where they like to be.
Try posting in the Handling section. There's a lot of guys that know tons about this topic like AutoxCuda and others.
Direct Connection published a book on Chassis's that addresses this issue in detail.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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Re: adjusting bumpsteer A body
[Re: mopar dave]
#1388388
02/16/13 02:13 PM
02/16/13 02:13 PM
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Joined: Jan 2003
Posts: 27,596
So Cal
autoxcuda
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,596
So Cal
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Quote:
anyone know of a bump steer kit for A body?
don't want to spend 350 on hotchkis tie rods.
You will need some sort of Heim ended tie rods if you want to be able to make an adjustment/correction to get the bump steer you are looking for.
You will also need to buy or make a bumpsteer gauge and buy adjustment shims.
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Re: adjusting bumpsteer A body
[Re: mopar dave]
#1388397
02/16/13 03:17 PM
02/16/13 03:17 PM
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Joined: Jan 2003
Posts: 27,596
So Cal
autoxcuda
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,596
So Cal
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You must convert that end you need the adjustment to a tie rod adapter with spherical rod end at the least. (I would suggest just converting the whole tie rod arm assembly to sphericals inner and outer. You may need to adjust the inner tie rod too.) Then make the adjustment and fine adjustment you get a bump steer shim kit: http://www.quickcar.net/index.php?crn=233&rn=776&action=show_detailAnd of course you will need a bump steer gauge: http://www.google.com/search?sourceid=na...Aw&bav=on.2,or.r_gc.r_pw.r_qf.&bvm=bv.42661473,d.cGE&fp=f8b817aa2f760986&biw=1280&bih=530
Last edited by autoxcuda; 02/16/13 08:00 PM.
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Re: adjusting bumpsteer A body
[Re: mopar dave]
#1388400
02/16/13 04:11 PM
02/16/13 04:11 PM
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Joined: Jan 2003
Posts: 9,826
las vegas
70AARcuda
master
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master
Joined: Jan 2003
Posts: 9,826
las vegas
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Quote:
anyone know of a bump steer kit for A body?
don't want to spend 350 on hotchkis tie rods.
http://www.dillingerchassis.com/product/tie-rod-to-heim-joint-conversion/
chromemoly or aluminium sleeves
Last edited by 70AARcuda; 02/16/13 04:14 PM.
Tony
70 AARCuda Vitamin C
71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield)
71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas)
71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)
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Re: adjusting bumpsteer A body
[Re: mopar dave]
#1388402
02/16/13 06:18 PM
02/16/13 06:18 PM
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Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
dartman366
I Live Here
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I Live Here
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
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here is the end result of fixing my bumpsteer. looks slightly different from this, ended up using a shorter bolt and after tweeking the spacer was slightly shorter, plus I used a large washer under the heim joint to contain everything in case of joint failure.
Last edited by dartman366; 02/16/13 06:21 PM.
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
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Re: adjusting bumpsteer A body
[Re: mopar dave]
#1388403
02/16/13 07:38 PM
02/16/13 07:38 PM
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Joined: Jan 2003
Posts: 27,596
So Cal
autoxcuda
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,596
So Cal
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Quote:
Well I added the tubular uppers and had caster set to 4* which I think knocked by bump steer way off. ...
This are my alignment specs with the above bumpsteer measurement table:
toe: 1/16" toe in
camber: negative 1.5 degrees (top of tire in)
caster: postive 5.9 degrees
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Re: adjusting bumpsteer A body
[Re: mopar dave]
#1388404
02/16/13 07:55 PM
02/16/13 07:55 PM
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Joined: Jan 2003
Posts: 27,596
So Cal
autoxcuda
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,596
So Cal
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Quote:
.... I thought after reading the chassis book I needed to lower the outer ends. Just want to get it closer than 1"@3" rebound.maybe I'm wrong and need to raise them.
I was pretty close on my numbers so I did not make an adjustment.
But I did notice something going back on that Longacre bump steer guide:
Quote:
C. Making Bump Steer Corrections
Now that you have measured your bump steer you will need to adjust, shim or relocate the suspension components to get the exact reading that you desire. Below are some tips that will quickly guide you through the corrective process for cars with front steer style suspension.
I'm pretty sure that makes the Bump Steer Chart useless for rear steer cars. Almost positive.
I'm pretty sure for a rear steer cars you would swap all the "toe out" symptoms with "toe in". I'd have to think about it a bunch. But I would use the DC Chassis chart/guide.
Get the tie rod linkage you can adjust, get a bump steer gauge, get adjustment shims, and then go through the process. Add and take away a bunch of shims and record what happens. You will for sure learn what works for your car and have a better understanding on what is going on. That understanding WILL make you faster now, stay faster, and make you faster in the future.
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