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2g Bump steer issue

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lasthope05

15+ Year Contributor
1,144
267
Mar 31, 2006
Philadelphia, Pennsylvania
I picked up a 06 TL not too long ago that my significant other has been driving as her daily. With that said I parked my truck and have been driving her 2g around more often since it does much better on gas. However, one thing I've noticed is that it has some pretty bad bump steering issues.

Say if I was taking an exit off the highway at speed and there was a pothole or huge bumps, the car would feel like it wants to eat the wall. This only happens when I am accelerating into or coming out of a turn. She's never said anything to me about this issue so I guess she wasn't driving as spirited as I thought.

I'd also like to add that the entire front end is new, has been aligned and the car is at stock ride height. So is this normal or no?
 
2gs have always pushed through corners. Nothing new here. The sensation/motion may just be exacerbated by the bumps, but its likely present throughout the entire corner.
 
I'm getting use to it too. My 98 GST feels much different than many cars I've driven. I can't say that I'm a fan yet. Feels untrustworthy cornering and over bumps. Car likes to wheel hop too. The funny thing is I have a 01 3g Eclipse GS also, and it is by far a more solid platform. Both the 98 and 01 are lowered, but the 01 is smooth, comfortable, quiet, and handles like a dream. I doesn't look as sexy or have anywhere near as much power as the 98. But the 98 is a violent, loud, jerking, shaky ride. Both sit on new struts, ball joints, tie rods, etc. Just way different feel.
 
Im not talking about understeer here guys. Its completely different than bump steer. Bump steer is when you hit a bump in the road and the car steers itself momentarily in a different direction. I have noticed this issue occasionally on straight bumpy roads also, so its not just cornering. Thats just when its more pronounced. I dont notice it in my 1g, but then again I dont daily it and she only goes in straight lines.

The roads in Philly are complete shit so that could be compounding the issue? Who knows.
 
Yeah here in North Carolina the roads aren’t bad. So I’ve never had a bump steer issue. But I know what your talking about I was just agreeing with him. Try and get it up on a lift and check all the bushings and ball joints in the front. Because it should be doing that.
 
Have you got the revised lower compression arms? As the older units ppace more caster on 1 side and can cause wondering when a split in the road is present, i call it chasing the road! Its most likely not a bumpsteer issue as you would feel it over all bumps, straight alot more then cornering!

You say the front is new! Please detail exactly what is new and what was changed over! Something could have been missed or something is broken (it happens)

Personally it dont sound like a BS issue since stock ride height is very good at having little of it! But when you lower thats when the issues come about fast! So thats why i bekieve something else is a miss here unless a part on the car has altered the motion lines causing an imbalance and an effect similer to bump steer,

Post up the alighment data sheet too please, that will help also
 
I no longer have the spec sheet on the alignment but everything was within tolerance besides the driver side caster as I never flipped the bushing on the compression arm. I wouldn't think it would cause that much of an issue since it came that way from the factory. I'd like to note, it only happens with aggressive driving/turning. It's not noticable when driving normal.

As for the front end being new, everything was replaced. Upper and lower arms, including compression arms, wheel bearings, axles, both inner and outer tie rods, swaybar bushings and the corresponding end links.
 
Im not talking about understeer here guys. Its completely different than bump steer. ... Who knows.

Bump steer and/or roll steer is by design understeer. Chassis engineers design progressive understeer (toe-out with vertical wheel travel for front suspension) into most if not all road vehicles. You can measure and plot "toe vs wheel travel" with sandbags and ride height / toe measurements. and compare left to right.

It is a bit difficult to know from reading if your issue is abnormal. Your quickest detective work would be to see if left vs right turns behaves the same. Not easy if on/off ramps are your only test spots.

Since many parts have been changed/swapped it is a bit challenging to solve from a keyboard. From the top of my head, I would expect bump-directional change from:

1. high positive-offset wheels.
2. looseness in ball-joints.
3. incorrectly mounted steering gear or incorrect tie-rod ends.
4. improper length of longitudinal LCA.

Suspension kinematics 101: (modifying rollsteer)
The front-view angle between your lateral LCA (inner-LCA-bush center to outer LCA-balljoint) and tie-rod (inner-tierod-balljoint to outer-tierod-balljoint)
Suspension elastokinematics 101: (modifying toe vs for-aft load | throttle on/off or braking)
Plan-view angle between the lateral LCA and tierod.
 
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