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Guest Sim70

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Can anyone help just purchased a robin hood but need to upgrade the suspension but were can I get them and also what car they off its running Sierra rear subframe I think it's a 2b kit but not 100% I'm all new to this please help

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Guest 2b cruising

Mine are fitted with Gaz adjustable.

16" at full length.

If you call them they have a geezer that knows all you need fro the conversion.

It is a modification well worth doing.

My shockers run from the bottom of the anti roll bar to the original spring mount.

You will need a bottom simple to make bottom mount the fits to the hole in the bottom Spring well.

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Dave at Dampertech who are a GAZ agent is very knowledgeable about most models of RH and helpful too.

He can supply springs and coilover units to suit.

 

This site will help you identify what model you have...

http://nw.rhocar.org/identification.htm

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Thanks guys it's a 2b it's just the rear shocks i can't get my head round them as it's got a nut and bolt through the top but the bottom which is the sub frame it goes through and a nut holds that on

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Guest 2b cruising

Easy mod to fit but you just need the small bracket that holds the shocker through the brack and the bracket mount through the bottom subframe.

My shockers are ring mounts top and bottom. They don't mount in the same place as the original Sierra shockers.

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as mentioned already dave at damper tech is your man.

youll need the fitting kit from GBS unless your handy with a welder and can make them yourself

 

http://www.kitspares.co.uk/index.php?route=product/product&path=43_7&product_id=108&car=43

 

cant find link for bottom one..

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You can make 2 brackets from either U shape channel (3mm mild steel)

or RHS (rectangular hollow section) also in 3mm, by cutting out one side.

 

The top of the shocker still fits onto the bottom of the roll

bar, but you need to fit/weld a U shaped bracket onto the tube that is bolted

into the roll bar.

An identical U shape can be bolted to the bottom wishbone using the hole where the spring fits to now.

It will need an angle grinder and welding gear, but look for mobile welders

or a local garage will probably be able to weld the parts if you can make the bits yourself.

Edited by Bob Tucker
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+1 for dave at dampertech. He knows his stuff having dealt with many of these cars. If I hadn't dropped my phone and completely ducked it up I would put his number on here. If you Google dampertech his contacts will pop up.

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When you fit them try and align both the top and bottom brackets in the same orientation. This won't be exactly inline with the car as the swing arms on the subframe don't swing in a straight line. If you have a look at the wishbone mounting you'll see the 2 mounts are set at an angle not straight across the car.

 

If you don't you'll get a bit of stress on the bushes in the shockers as there will be a slight twisting.

 

It'll help the shockers last longer if you can get the brackets as close to inline to the direction of swing arm movement as you can.

 

I believe from what i've read on here you will want between 350 and 400lb springs.

 

If it's a 2b (or the subK ) it will have a tubular chassis which is the reason it was called 2b / tube-y

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350-400lb/in springs? on a car that only weighs 700kg or 1500 odd pounds! thats 1600 lb of springs being compressed by er.....0 until you sit in it then your getting about 2mm of travel.....if that..... because bear in mind the unsprung weight of your car is going to be close to 150kg at least (about 330lb) so for 400lb springs you will have a rock hard drive that will be close to F1 cars....and that is not good. they have wings to produce down force of over 2200lb you dont!

my car (i know its a Dutton Phaeton) weighed 770kg with me in it and it had 250lb up front and 190's at the rear it was very firm.....i put 180's up front and 120's at the rear the difference was mind blowing! the car on the same tyres was utterly transformed handling wise from a little twitchy and tail happy to glued to the road surface. its a common mistake to think that harder springs equal better handling. it almost never does.

I would ask about a lot more before i committed to buying springs, 400lb sounds a bit much to me. the front end wishbone set up can have a leverage effect which can require stiffer springs and i am not expert on robin hood suspension but dont be rushing into rash decisions on springs. the best grip on corners is made by good tyre contact with the road, a solid suspension set up causing the tyre to skip over the road bumps isn't getting good tyre contact or therefore grip.

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IIRC the Phaeton has a solid rear axle, so the springs are being compressed vertically at 1:1, so 190 springs

will be fine.

The Sierra A arms at the rear of a hood mean about 2:1 leverage on the coilovers, so 300 isnt so far off,

& is borne out by actual spring rates being used on Hoods.

I know that Dampertech & Rally Design are happy to swap springs if you get it wrong.

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