Rear Suspension

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The rear suspension is now taking shape. I was beginning to think that I would never find a Sierra Diff! Nearly a year of surfing and hundreds of bids later, I have a gem of a diff. When I opened it up, there was zero signs of wear and the oil looked bottle fresh.

I thought I paid over the odds, but already I’ve seen several at twice what I paid 5 weeks ago. If you see one, buy it now!

This Haynes Roadster rear suspension employs off-road motorbike, triple adjustable, shock absorbers that are actuated via bell cranks and push rods. This gives a rising spring rate during roll.

30% Anti Squat has also been incorporated to give a leveller ride during acceleration.

The rear suspension was designed using Kangaloosh and SuspEdit; vehicle modelling systems not just popular with the gaming community but also high profile race teams.

The Lobro ‘Ford Sierra Diff’ is a 7″ unit is actually from a low mileage Ford Escort Cosworth 4×4 (3.62:1 LSD). The hubs are from a 5 stud Ford Scorpio 24v. The plan is to use huge vented Audi rear discs and calipers, so I will probably need to address the smaller Scorpio 273mm hubs at a later date.

I been lucky enough to get hold of ‘new, old stock’ CV joints, wheel bearings, diff rebuild kit and gators. The shocks are also very low mileage but are from race bikes, so may have seen hard use – I wait to see how they perform.

I have used several clevis joints each side. This should enable a large range of adjustment of virtually all suspension parameters. If I am not happy with the handling decided for me by the modelling software, I will be able to change it.

The reason why I have gone 5 stud is that I have Audi 19×8 wheels.

When I am fully over my current illness, I’ll spark up the welder!

Locost CAD rear suspension

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