ljpviper

iTrader: (3)

I am having an issue with the rear end moving forward when going up an embarkment sideways. It seems to only happen when I go up on the right side not the left.

The issue is the tire is moving forward and eating my flair(its a widebody). It has Respeed springs/adj collars, tokico illuminas, 17*12 with 315*35. Thats the lowest profile you can get for a 17 inch rims that wide.

Everything looks ok, watts, etc.

Any clues????

Starfox07

I would check bushings first. Maybe a bent control arm

peejay

If the car is lowered, that is kind of normal. The Watts is not symmetrical and has quite a bit of side to side motion as a result (Mazda only used it for space reasons) and once you lower the car past the point where the links are parallel to the ground, the rear end moves forwards in bump.

I forget which way the rear end moves side to side, but I bet the reason it only hits on one side is because it's sitting over to that side more. You didn't mention which side was hitting but the cars naturally sit lower on the left than the right due to some body assembly errors in the FB chassis, as well as weight distribution problems.

I am assuming that you checked and made sure that the lower links are straight, the Watts links have not broken (have had this happen, upper link broke at the chassis end), and the floor isn't rusted to the point where the lower link brackets can move around.

edit: I just saw your tire size. Those are gigantic. I am surprised they fit in the stock wheelhouses even after cutting the body lip away, and for it to not sit up like a 4x4 you'd have to have at huge drop. Time to re-engineer the suspension, or duct tape a bath towel around a sledgehammer and do some clearancing.

ljpviper

iTrader: (3)

Peejay, you know your stuff

Yes, the right is the side with the issue. Like you stated the entire rear end is shifted a little to the right, maybe causing it to move foward as well.

Its a tight squeeze with those tires, I am going to paint the car soon and want everything sorted out.

Do you going to a new panhard, etc from G-force engineering might solve the issue.

Back in the days I believe they used to run 16*11/12 on rears on the race car, 17 inch is pushing it in the rear.

peejay

The Panhard would allow you to re-center the axle under the car, at the very least.

trochoid

iTrader: (6)

When you tightened down the suspension components, was the weight of the body resting on the tires on the ground or on jackstands? If the suspension parts are tightened/torqued down while the suspension is hanging from the body, it developes a 'set'. Once the weight of the body is back on the wheels, the suspension tends to shift to on side due to windup in the bushings.

jgrewe

iTrader: (1)

The upper links will cause more forward movement than the watts link. They start out life tilted up in the back and when the car gets lowered they swing even further making the top of the rear end come forward.