Ok, I already now what bump steer is and I once experienced it when I test drove my vette before I started resto on it. I was cruising down a road with a light curve to the left. There was a pothole in the road somewhere. My right front wheel got into the pothole and suddenly the entire front of the car kind of jumped to the right (not because of a bad steering correction of my part btw) . I missed a tree with about 4 inch. I first thought this had something to do with the lack of poundage in the front springs, so I initially installed the gymkhana type spring

Now I know this has something to do with bump steer.

Is there a solution ? I don't want to do the steeroid thing, so what is there else.

I see Guldstrand sells the bumpsteer adaptors. Are these any good ?

Thanks

 

I would check out "play" in ALL of the steering linkage as well as ball joints. Make sure your steering box is in good shape..and it can be adjusted some. Last resort would be to put a steering Dampner on it. Best of luck.

 

if you're getting bump steer, you need to go through the front end. a properly built front end just won't do that imo...

 

Yes it will, many cars over the years have had varying amounts of it....
Norval on here will come in at some point, and explain it all, the mods are many and varied to cure this.....

 

The biggest inherent problem with any C3's overall suspension geometry is not in the front end, but in the rear, where a syndrome known as 'toe-steer' occurrs when the car leans into a corner. The C3's trailing-arm rear suspension geometry causes each rear wheel to point outward as it travels up (or down) along its arc, since the axis of rotation is between the forward mount of the trailing arm and the inboard U-joint. If the car's ride height and rear camber adjustments are correct the rear wheels point straight ahead, but hitting a big bump with one front wheel could easily unload the opposing rear wheel enought to cause it to move downward and therefore out enough to momentarily cause the car to steer in the opposite direction. Without significantly redesigning the rear suspension, the only way(s) to really minimize this tendency is to minimize rear wheel movement by installing stiffer springs and swaybars. The aftermarket front end kits out there can be effective at giving your car a more positive and direct 'feel', but they won't address the systemic problem created by the car's somewhat crude and inadequate rear geometry. If you look at statements made by Corvette racers from the early 60's (Bob Bondurant, Doug Hooper, Paul Reinhart, and others) they indicate that these cars absolutely scared the hell out of them when they first made the transition from the early solid-rear-axle cars to the '63's. High-speed braking and turn-in could be terrifying. Once they had sufficiently stiffened the rearends to make them driveable at high speeds, they were okay. If your car has a base-model mush rear spring and no swaybar, I would suggest looking at getting that corrected.

 

i suppose we'll have to agree to disagree then because imo, if it's jerking him as bad as that, something is f'd up.

i did have one jump around pretty bad when the rear spring was about to go. it was obvious that it was in the back though.

 

OH HELL YES....I had my rear get into a disagreement as to just who was in charge going around a left turn at higher speed....

heading for the ditch, over correct, heading for the curb...over correct again....lock the steering hard over spins out in the first directon (to the right, yet again) stopped facing the opposite direction....vette unhurt, my ego.....







DESTROYED.......


Think he was referring to the old C1 design....Carroll Shelby? said, 'if you can DRIVE a vette, you can drive anything'.....words to that affect...

 

Well I went over the intire suspension and mounted a rear stabilizer bar and a 7-leaf spring. So basically it will pretty stiff right now. However, i think there could be something done to the front.
It pratically impossible to get anything better out of the rear without mounting something like a guldstrand-kit.

 

In case you missed it, Jason Staley posted the results of his bump steer re-work here...

http://forums.corvetteforum.com/show...1748462&page=2

After seeing those results, there's no doubt I'm going to follow thru and install the Guldstrand bump-steer blocks I've had laying around. Also, I may likely do the tall upper ball-joints as well, especially if I have to stay with the stock upper control arms for now.

...btw, I'm of the stiffer springs / smaller (or no) anti-roll bar persuasion, especially on the rear.

 

 

Just fitted Speed Directs Alloy upper control arms and semi coil over shocks so going through sorting sessions similar to Jason. The Alloy upper control arms have lower pick up points than standard which helps eliminate bump steer and you can also wind on more castor which helps when you are running bigger diameter wheels.