Phil79

I remember seeing a red ERST in performance/fast ford that had some "droop limiters" fittied. They basically looked like bits of wire through the inner wings which, I assume, were attached to the hub to stop the front end lifting under acceleration.

Can anyone confirm what they are and what they do?

ian sibbert

Droop straps/limiters are to prevent driveshafts, suspension and chassis damage when the suspension goes to full droop (suspension dropped)....they are the opposite of bump stops....

Ian

rapidcossie

it was Simons car so pm him...

sas is his user name

WD Pro

I have heard of some of the westfield people running something similar on their racers instead of an anti roll bar.

It helps prevent roll as when the supension drop is limited under conering it prevents any more roll without actually lifting a wheel.

Dunno if its the same thing your asking after

S1

They are fitted to prevent the front end up the car lifting up when launching so as to reduce weight transfer from the front wheels to the back. Ask DannyB for a more technical answer, he was looking into doing something for the FWD drag boys

dojj

iTrader: (3)

ain't that the same as putting in stiffer springs in the rears?

i don't think a bit of string and a rubber bung is going to solve your problems but it could be a start

sas

Hi there, the droop limiters are fitted to my car.

The reason been as you know the car squates at the back under acceleration so you fit stiff springs (600lbs) to stop the rear end squat. But this now means that the car lifts at the front so the weight is again transfered to the back.

The droop limiters prevent this by ristricting the front suspension droop.
The side effect of the limiters are that cornering hard on a track it can prevents the front inside wheel maintaining contact with the track so looses traction/drive. But this is dependant on spring rate!

I worked/built on a Pilbeam MP/84 LM2 sportscar that raced at Le Mans that had a simular device fitted.

Simon.

THE RADMAN

iTrader: (2)

any pics of these?

zippyobrien

iTrader: (2)

do you have to rienforce the inner wings to take this, i take it loads strain on to them ?

morch

I remember seeing these in the feature, they looked a bit Heath Robinson, but i can see the method behind your madness

sas

The ones in mag were development ones - you could adjust them quickly and easly, to find out how much droop you needed.

New ones now are hidden.

The front suspension turrets are double skin around the area of the hole so no need to reinforce, just spread the load with a large washer. The load placed on them are dependant on rebound rate of the damper and the spring rate.

Simon.

Micky The Finn

ian is correct here,but i suspect that some folk have other uses for them.

sas

But as I have explained, for this aplication they are used to prevent rearward weight distrabution, but a secondary use could be to prevent driveshafts poping out/rubbing.

Simon.

Micky The Finn

ford did it to thier works cars from 1985 mate so hardly a secondry option,i think its been copied for your aplication since.

sas

You are misunderstanding the point.

I dont claim to have invented them!

I am using them for weight transfer not to stop contact to the body.

They are used on FWD drag cars, RWD circuit cars and of coure on RWD rally cars, infact you can use them on anything to transfer weight from one corner of a chassis to another.

My old boss Mike Pilbeam who designed the suspension on the RS 200 has used them on many of his designs.

Simon.

dojj

iTrader: (3)

if they work and they improve the things you want them to improve then it's all

they did look a bit cheap and nasty to be honest mate, but if they are prototypes then thats what they should look like