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MG MGB GT V8 Factory Originals Technical - Inside Wheel Spin Around Corners.

Heres the thing: I have cranked up the power to the point where I gained 10 sec around my favourite track. Greedy me wants more! The problem is that the inside wheel is spinning around corners; not a good thing as far as laying down power goes.

The suspension so far: Lowered 1 1/12 inches (CB GT) Stock lever arms. Panhard bar running above (2 1/2 inches)and parallel to the rear end. I know that under the axle would be better. Front has 3/4 sway bar and v8 bushings

The obvious solution would be a LSD, however I would like to save that as a last item; adding LSD at this point would mask any weight transfer improvements that I make.

I figure with the V8 engines you guys would have dealt with these issues and found some solutions.

Pete
Pete

Pete,

You are correct in your assement of the Panhard bar location. It could be contributing to the inside wheel lifting. As the body shifts due to centifugal force, the bar pulls the top of the axle toward the outside and lifts the inside wheel. Some others may just call it raising the roll center. Try removing the bar for a few laps, if you can live with the tires rubbing. A wishbone attached to the bottom of the differential could be a better choice and more compliant springs wouldn't hurt with a lowered roll center.
George B.

George:

By the same argument, while the upper panhard bar location will "Pull" on the outside tire during right hand turns, it should "Push" and plaant the inside during left hand turns (Body anchor is on driver's side, axle mount on passenger) Wheel spin is equal in both directions.

Would increasing the front sway bar size, while adding a rear bar, be a good idea? Not even sure I could get a rear bar on with the panhard bar. I need the bar or tires will rub.

Pete
Pete

The 3/4" bar may be too big. Adding a bigger sway bar at either end tends to make the opposite end looser. Also, what George was saying was not that the panhard bar would pull on the outside tire, that would be quite difficult as the momentum being transferred from the body is all pushing towards the outside of the turn. What he was saying is that with the panhard on top the axle the longitudinal roll axis of the car is moved upwards. Putting it below the axle moves it downwards. This is because you have a lever arm up on top that the momentum of the body is pushing against, tending to plant the outside wheel and lift the inner one.
Jim Blackwood

I believe you will find that it doesn't matter whether you push or you pull; if the attachment point is above the axle centerline the inside wheel will be pulled up or the outside will be pushed down hard enough to lift the inside wheel, as Jim says. Adding a rear anti-sway bar will increase the tendency of the inside to wheel lift. Heavier duty front shocks could help a little. Always remember that you are not trying to make the car corner flat, you are trying to keep both rear tires in contact with the road regardless of body roll.
George B.

Pete,

I would try an uprated front bar which may give some understeer so add neg camber to increase front end grip, avoid a rear bar as this will add to lifting inner rear wheel. Also consider uprating dampers and Frontlines Rear Traction Control Link, Anti Tramp bars and LSD.

Paul
Paul

This thread was discussed between 26/05/2002 and 27/05/2002

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