Ghetto style AE86 traction brackets

[grey_nomad]

Made from 3mm steel plate, spare shocker spacers, elbow grease and oxy set...
Adjustable too

[oldcorollas]

do they "work" ? (they look the business )

[grey_nomad]

Reckon they do...

Ran in autocross last week and they seemed to make the car more controllable (and more fun) when sideways.

[cri_ag]

these will reduce axle tramp right?

[mrshin]

'Traction brackets' = the goods on these cars. No harm in a home made set, who cares if the welds look a bit lumpy!

[grey_nomad]

They give you more traction. Normally the lower trailing arms are horizontal, but with the brackets they slope down from the front mount to the axle.

The theory is that as the axle wants to rotate backwards under power, the reactive forces are transmitted slightly upwards along the trailing arms against the weight of the car, hence better traction.

[grey_nomad]

No harm in a home made set, who cares if the welds look a bit lumpy!

They were copied from after market brackets fitted to my son's AE86. Lumpy welds don't matter as long as there's good penetration. Besides, after a few more autocrosses you won't be able to tell from the mud etc.

[Screamn_Sleeka]

What about the upper trailing arms? do they need to be changed accordingly? Is so, does the diff side go up or down?

[oldcorollas]

all the force to move car forward goes thru the lower arms. the upper arms are effectively pulling the car backward

"traction brackets" give the car more anti-squat... or less squat,and push the car thru an axis closer to the CG (as Mr Nomad said).

moving position of top arms will change the pinion angle change with suspension movement, and also affect the squat/dive (depending which way it is angled.. up or down...)

[brett_celicacoupe]

all the force to move car forward goes thru the lower arms. the upper arms are effectively pulling the car backward

other way around


and the forces are equal in the top and bottom arms since the moment radius between the axle and trailing arm mounts are the same for the lower and upper arms

[brett_celicacoupe]

looking at the RH side of the car,


f = y/x in both cases since x is equal (if i recall correctly with the toyota diffs)

the top trailing arm is in compression under acceleration, the lower in tension

[oldcorollas]

are ya sure?

looking from drivers side...
to go forwards...
wheel must turn clockwise
reaction force on diff housing is anti-clockwise
the lower arm must be in compression
the top arm must be in tension...
cos diff pinions "climb" under power.. etc....

[Screamn_Sleeka]

so dont change the upper mounts, but they should be the same length as lowers, and lowers should have there diff mounting points closer to the ground.

[oldcorollas]

looking at the RH side of the car,
f = y/x in both cases since x is equal (if i recall correctly with the toyota diffs)
the top trailing arm is in compression under acceleration, the lower in tension

i think ya forgot that the diff has a reactioanry torque that is opposite to the tyres...

tyres turn clockwise... so they are pushing clockwise.... the road pushes back anticlockwise.. and that is the force the suspension arms need to resist

[brett_celicacoupe]

yeh thats right.

i got some confusion with the internal forces of the trailing arms

ill still argue the forces are equal assuming the trailing arms are parallel to the road surface