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Author Topic:   4-bar question
posted July 08, 2003 10:08 PM
lifting the left lower link up should loosen turn entry. if you have a look at the arc that it travels as the rear end falls down (during roll) you'll see that it will drag the rear end forward, it will also shove up on the rear end of the chassis.
lifting right top bar should promote forward bite from middle and out of turn. it will also increase roll oversteer.

go to the circle track (magazine) web site & check out past tech articles, there is a good one called "demistifying the four link".

also, go to the links page from and link to 4 link suspension simulator - worth a look.

hope this helps

posted July 09, 2003 10:38 AM
Would raising the RR upper bar promote forward on the RR?Making the car looser off the corner?
Therefor raising the LR upper bar would promote forward bite on the LR making car tighter on exit?How does raising the upper bars effect corner entry.
Thanks for any reply, i am trying to learn this 4 bar deal..

posted July 09, 2003 12:48 PM
although i have had some success raising the top right rod to help the car turn, i believe that this was just covering up another problem.
usually the lower rods are used to tune corner entry and the top rods for exit.
top rod angles will also increase/decrease bird cage indexing.

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