Jason Moyle Racing

This development is about getting the stiffest set up for the lightest design with the minimum spend - normal for me!

I've gone off the old style VWMS design as it's heavy and gets in the way for exhaust and aero [undertray]. The regulations dictate certain parameters that stop independent rear arms so it must remain a beam but I think I might cut some of the stiffness out of the centre and use a proper roll bar to control the weight transfer and roll. This will let me use softer springs and aid compliance on the hills.

The ARB will be mounted in side the car and use a hollow tube and maybe a solid bar in side with a series of adjusters to give a few different beam settings for quick wet/dry settings. There will be rose jointed droip links down to the beam.

The pick up points will be as far form the pivot point as possible to get the maximum control form the ARB. The mounts will be incorporated in to the boxing in or the trailing arms.

There is the main new development. I'm going to box the rear trailing arms, as shown by the cardboard template below. the top one will be angles to ensure clearance on the chassis rails.

The next part of the puzzle are the hubs and brakes. I could use modified VW hubs, either machined drums or discs. But I've messed about with some MK2 and MK4 discs and hubs and they are far to heavy.

The problem is the back end and brakes do nothing much on a FWD sprint/hill car. Colin Satchell uses Go kart brakes and I was going to use them and after seeing Colin also uses them was quite happy with that. However after having a think, mini moto brakes and discs are cheaper and will do the job. I could use escort GP 4 alloy hubs and Caterham spindles but if I can get some bespoke alloy hubs machined up for sensible money I might concede the weight of std Golf spindles as I have them on the shelf.

I can mount the brake calipers off the alloys adjustable hubs, either radial or bolted plate. 4mm thick plate will be enough and 4>5mm thick drilled discs will do. There are some suitable single or double piston mini moto calipers about for around £14.00 inc. pads, mounting plate and delivery so I'll make them fit, discs less than £10.00 in any sort of design/pattern you like!

Here is the typical design on my sons mini moto bike, I'll get a set and design the hub/mounting plate to suit.

Really interesting Tony, love the inovative approach and thinking. I have been researching beams and have some ideas on what I will do with mine. We should catch up over a beer if you are around and up for it?

[/URL]

In modern torsion beam design the spring platform is similar to what you propose, I would guess it would add plenty of lateral stiffness.

Also note that a section of the beam has been cut out with a plasma cutter, these reduces weight but I guess reduces torsional resistance helping to make it more like an IRS system.

Tom, thanks for PM and Info here. struggling with computers and phones, neither seem to do everything I want, third time in 24hrs trying to reply on 3 different machines!! Losing the will to live now, bugger!

We will meet up, we did say we would. I'll send you my tel no and we can sort something, I'm a little tied up this week in work though.

Tony, for work (non real car related) I have been making a project similar to yours, it uses adjustable hubs.

I agree with a car but this is a light toy, plenty of lock tight and they will be fine.