Are ther any chassis plans for using the Sierra IRS set up?

Cheers

TT

The tiger avon book or Darren @ GTS can supply them.

Ned.

does ne1 have the plans for the wishbones for the gts. pdf on the site doesnt load. can i use book wishbones with gts chassis and sierra? I recieved my chassis plans today and it does not include wishbone dimensions. cheers

[Edited on 22/7/04 by lord dave]

Anyone got a pic ov the AVON chassis?

Anyone know if the AVON chassis comes with wishbones?

TT

TT,

Why would you want to use an Avon. Everyone on here who is building one says it's a bag of shite!

James

Isn't the GTS kit a de-dion kit only? I don't remember seeing an IRS version. Having said that you might want to look at the GTS kit AND the de-dion option as it is a compelling design!

Cheers,
Craig.

Craig,

he asked about using the sierra IRS setup which i think the GTS dedion does quite nicely

Ned.

Ned,
Oh right, I see what you mean now. I read it that he wanted to build an IRS car based on a Sierra...

Cheers,
Craig.

If there are any plans using the Sierra rear wishbones then that would be the way I would go at first.

Probably end up just modifying the live axle plans to incorporate the sierra arms..

TT

I am building my own Stuart Taylor IRS rear end as the part built chassis I bought came with ST wishbones and uprights. I talked to Alex Roebuck http://www.locosaki.co.uk/ (who had built one and then crashed it on his first trackday) and he allowed me to come and take measurements. Very helpful chappy. In the midst of building it now.

Adam

Sierra doesn't have wishbones, it uses a semi- trailing arm like the BMWs. I think Steve Gusterson used the sierra backend and loudly advises anyone else not to! 'Cos it's all big & heavy & not really suited to locost style consrtuction. I used mx5 uprights + my own wishbones + sierra diff; if I hadn't decided to use the mx5 bits I would definately have considered the GTS de dion.

Mhh that setup does look good,

I was wondering how feasable fitting the ABS would be those mountings unfortunatly obscure the toothed wheels..

TT

Yes Technicaly they are Trailing arms.. And They are a bit heavy and Cumbersome..

It's difficult to envisage the GTS setup from teh picture on their website.

TT

My advice is not to use the sierra rear suspension and to go de-dion if you want to use a sierra rear end and want the least amount of hassle.
Are you familiar with how de-dion works?

I used to be but can't visualise the system anymore...

TT

I can't remember / find the site I got this from but I'm sure somebody on here will know.

quote:

---

Originally posted by twinturbo
I used to be but can't visualise the system anymore...

TT

---

can I ask a question?
why not use leaf springs with the dedion axle,
you would not need the trailing arms and brackets then.

I don't know much about leaf springs but I'd expect they are much heavier than coilovers and since you need to mount a damper anyway, you might as well wrap a spring around it. Also, I don't think(?) that a leaf spring provides a very positive method of location which trailing arms and panhard rod certainly can.

Cheers,
Craig.

I,ll give you the heavier bit, but not positive attaching the axle. I am an horticultural engineer ( lawnmower mechanic) by trade, one of the machines we sell/repair is the kawasaki mule, a 4wd truck thing, top speed about 25mph, but fitted with a dedion axle and leaf springs. these trucks go everywhere and the axles never move (apart from where they should)

Fair enough, as I said I don't have much experience of leaf springs...

The reason I was expecting them to be poor in location (mainly longitudinal location) is due to the fact that it is designed to permit movement at the end of the spring. Having said that I guess it is only one end which needs to have the flexibility so the other end can be firmly fixed.

One question I still have though: How is the "rotation" of the axle controlled? With trailing arms (5 link axle) the rotation is controlled by virtue of there being 4 trailing arms which are commonly (not always) the same length and thus stop the axle from rotating about the same axis as the wheel. How is this done on a leaf spring axle?

Cheers,
Craig.

A few thoughts about leaf springs vs. coilovers:

-- The coilovers usually used are racing-type gear, allowing an easy and inexpensive change of spring rates.

-- Coilover dampers are usually either adjustable, or purpose-built to match the spring ranges used on Locosts. Finding plain tube shocks for a car as light as a Seven would be a challenge, IMO.

-- Rear axle hop under acceleration can only happen with leaf springs.

-- The Locost is designed to use coilovers, with much bracing in the shock towers, while there's no place to put leaf springs (IMHO).

For more details, see http://www.coilovers.org/

Pete

the axle is fastened to springs with 2 u bolts at each end. the u bolts pass through a plate which is part of leaf spring. in the middle of this plate is a hole, a projecting peg from dedion axle locates into said hole. result is a strong and reliable axle which does not give any problems.