Bump steering - what to change now ? - Chevy Impala SS Forum
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post #1 of 12 (permalink) Old 10-02-2015, 09:29 AM Thread Starter
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Bump steering - what to change now ?

ok this is for a RMW 92.
Every piece of front sterring was renewed or replaced. steering gear new from Delphi.
new B46-1516/1517 shocks
17" Impala SS rims installed.
geometry set.

on flat road it is quite good for what it is (old design car)

on less flat roads I have noticeable bump steering.

I was thinking of putting new MOOG variable springs and may be sport B46-1104/0929 Bilstein shocks to limit the suspension travel and possibly limit the bump steering.

But yet I think it could be something else I have to do ??

Any idea ?
thx

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1992 RMW from Miami - FLOWTECH Afterburner Headers - dual system with HOOKER Aerochambers - 9C1 injectors at 14 psi - EBL Flasher - Crane Cams Roller Rockers - Comp Cams camshaft.- K&N Open element - Electric fan - Impala SS Rims - FEDERAL SS595 255/55/17 - BILSTEIN "Granpa" SHOCKS - 4L60 fully rebuilt with TRANSGO/Dana kit - EDGE TC

1974 Camaro 305ci (SOLD)
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post #2 of 12 (permalink) Old 10-02-2015, 08:53 PM
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If you installed the parts correctly, had it aligned correctly, and you did not have bump steer, you should not have it now.

Bump steer is caused by the misalignment of the pivot points of the inner tie rod mount/center link joint. If they are not aligned with the extended line through the center of the lower arm pivot(s) you get bump steer. There is a link made that allows you to adjust the up and down position of the pivots to align them with the centerline of the arm pivots. The distance between the mounts for the inner tierod ends is too wide or narrow, it will also cause bump steer. Unless you got the incorrect center link, the mounting points are not adjustable.

If you got an incorrect idler arm for the passenger's side, it could raise or lower the pivot for that side. The steering box side is less likely to be out of position, because the Pittman arm is not changed, or moved. If you changed the Pittman arm, it could be one of the possible issues.

1991 OCC 461 (.030 over 454) BBC, 3.23 posi, flash to pass, drop spindles & springs, Impala rims, Hydroboost, Recaros, MOMO/wood SW w/QR, custom wood shift knob, Pioneer DEH P77DH
1992 OCC now with 5.7 tbi, DEH P77DH
For a parts list, check https://www.impalassforum.com/vBulle...ion-parts.html
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post #3 of 12 (permalink) Old 10-02-2015, 10:08 PM
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Not sure how you could possibly have a bump steer problems with stock steering unless something is bent or you got the wrong size parts. Perhaps you're problem is with the wider Impala tire riding the groove and or the crown in the road.

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96 BBB Impala SS - Stock with bolt-ons 12.82 @ 106
96 DGGM Impala SS - 496 BBC 10.13 @ 134 all natural, 9.69 @ 143 on the gun
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post #4 of 12 (permalink) Old 10-02-2015, 10:59 PM
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If you're referring to the car wanting to go this way or that way as it hit irregularities in the road, i found my 95 did that when i put on the impala ss wheels. Same thing corrected other cars i have that act like that. Always turned out to be toe setting needed to be readjusted. 1/16 - 1/8" toe in and all is good again.
The original tires with their taller softer sidewalls tolerate it being off much more. Got to a lower profile tire and whammo, car becomes almost undriveable. I adjust myself and it works out great.
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post #5 of 12 (permalink) Old 10-09-2015, 11:09 AM Thread Starter
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OK.
I think that the Impala Rims are not helping but I tried several geometry settings toe in to 0 or toe in a little bit.
Less caster (from 4.5 to 3.5)
The wandering attitude still there on not perfect flat roads.

I think that may be the rod pivots are not where they should be (assymetrical probably) Did I say my steering wheel does not point straight ?

However except the normal setting with the tie rod end adjusting sleeve I do not see what else can be adjusted ??
Pitman arm is OEM but steering gear is new Delphi 600 (if I remember the ref)
Idler arm is moog problem solver. cannot adjust position I think.

All in all if someone has the detail of what to look at and what to measure I take it !!

If you want to save a tree, eat a beaver.


1992 RMW from Miami - FLOWTECH Afterburner Headers - dual system with HOOKER Aerochambers - 9C1 injectors at 14 psi - EBL Flasher - Crane Cams Roller Rockers - Comp Cams camshaft.- K&N Open element - Electric fan - Impala SS Rims - FEDERAL SS595 255/55/17 - BILSTEIN "Granpa" SHOCKS - 4L60 fully rebuilt with TRANSGO/Dana kit - EDGE TC

1974 Camaro 305ci (SOLD)
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post #6 of 12 (permalink) Old 10-09-2015, 03:23 PM
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If the steering wheel is not centered, the steering center link will be offset. This could be the source of your bump steer. Center the steering wheel, and then check for bump steer.

1991 OCC 461 (.030 over 454) BBC, 3.23 posi, flash to pass, drop spindles & springs, Impala rims, Hydroboost, Recaros, MOMO/wood SW w/QR, custom wood shift knob, Pioneer DEH P77DH
1992 OCC now with 5.7 tbi, DEH P77DH
For a parts list, check https://www.impalassforum.com/vBulle...ion-parts.html
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post #7 of 12 (permalink) Old 10-27-2015, 07:46 AM
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There is an aftermarket "race" drag link for these cars that has provisions for adjusting bump steer. I have one on my Impala.

Jonathan

96 Impala SS, DGGM, 2nd owner, 101k miles, #39736 of 41934, Build Date 22 November 1996
96 Caprice Civi L99, bought it new for my Uncle, recently re-acquired
92 Honda Accord 2 door, 353k miles, daily driver
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post #8 of 12 (permalink) Old 10-27-2015, 09:01 AM
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Here is the site for the adjustable center link: http://www.howeracing.com/p-7403-sto...nterlinks.aspx

1991 OCC 461 (.030 over 454) BBC, 3.23 posi, flash to pass, drop spindles & springs, Impala rims, Hydroboost, Recaros, MOMO/wood SW w/QR, custom wood shift knob, Pioneer DEH P77DH
1992 OCC now with 5.7 tbi, DEH P77DH
For a parts list, check https://www.impalassforum.com/vBulle...ion-parts.html
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post #9 of 12 (permalink) Old 10-27-2015, 09:08 AM
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Quote:
Originally Posted by Fred Kiehl View Post
Here is the site for the adjustable center link: http://www.howeracing.com/p-7403-sto...nterlinks.aspx
Yep. that's the one I have.
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post #10 of 12 (permalink) Old 10-27-2015, 09:22 AM
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I can't see the large image on Howe's site for some reason... What kind of adjustment range does that center link give you?
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