Front Suspension Shims.

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Front Suspension Shims.

Post by Rev Light » Mon Apr 24, 2017 5:53 am

What is the relationship between shim thickness and wheel camber in degrees?

I am going to have to adjust my front suspension as I have some camber to adjust out

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Steve


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Re: Front Suspension Shims.

Post by scimjim » Mon Apr 24, 2017 8:28 am

I was looking at SE6 last night when I replied to your PM Steve. SE5/a is

Castor (static laden): 2 deg 40 min
Camber (static laden): 0-0.5 deg
KPI: 9 deg
Toe in: zero

0.4 deg per shim rings a bell but I don't have a note of shim thickness.


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Re: Front Suspension Shims.

Post by Rev Light » Mon Apr 24, 2017 10:37 am

So the shims all the same thickness? And each shim is 0.4 degrees.

So if my wheel that has 3 degrees negative camber, I would need 7 shims to reduce it by 2.8 degrees

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Steve


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Re: Front Suspension Shims.

Post by Terry H » Mon Apr 24, 2017 10:54 am

The shim set I bought for my SE6 from QRG were different thicknesses. Think of it as if all shims were 2mm and you needed 3mm, two shims gives you 4mm so you would need a 1mm shim plus a 2mm shim to give you 3mm. Hope that makes sense.
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Re: Front Suspension Shims.

Post by Oldconn » Mon Apr 24, 2017 11:14 am

I removed a shim of 3mm thickness from my 6A. That made a difference of 1° , from half a degree positive to half a degree negative, measured on a laser gauge.


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Re: Front Suspension Shims.

Post by Rev Light » Mon Apr 24, 2017 12:38 pm

Okay, we I must get my car on the level so I can get the true picture of what needs to be done, before I rush out and start ordering things.

Cheers

Steve


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Re: Front Suspension Shims.

Post by Oldconn » Mon Apr 24, 2017 4:36 pm

Do you have a tyre-fitting place where they can check your suspension geometry on a laser machine? There's nothing more eccurate.


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Re: Front Suspension Shims.

Post by gtcse8 » Mon Apr 24, 2017 5:43 pm

Steve I have a few NOS shims in stock, but would have to measure them to see thickness.

I once got a 6a in that ate tyres for fun, discovered that even after the factory had introduced a 1/4" backing plate, plus shims the whole driver side was out.

Don`t forget that any weight in the car WILL alter the Camber as the front uses unequal top and bottom arms.

Best way to go is to fit a set of factory "Test Bars" in place of shockers.

The sizes are out there in a factory book, but I can`t lay my hands on them at present.


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Re: Front Suspension Shims.

Post by Roger Pennington » Mon Apr 24, 2017 5:51 pm

I posted the diagram for the factory "height bars" in another thread recently. Here it is:
Height Bar Dimensions.jpg
Height Bar Dimensions.jpg (127.08 KiB) Viewed 1778 times
This comes from the Se6a Workshop Manual, but I don't see why they shouldn't apply equally well to 5-series. Note that it assumes that the suspension is being set for standard ride height.


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Re: Front Suspension Shims.

Post by gtcse8 » Mon Apr 24, 2017 5:54 pm

Cheers Roger

That`s what I made and use.


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Re: Front Suspension Shims.

Post by Dennis Nicholas » Fri Apr 28, 2017 12:20 pm

The Reliant shims look to be a certain shape. I have seen some shims that "local" tyre shop uses and they were rather a lot less wide so that the bracket would overhang the shim on each side rather than there being shim material for the full width (and maybe length) between bracket and chassis. To my mind that seems bad engineering at a point of fairly high stress?? So best to have the correct size shims?
Maybe some tyre places have bigger shims?

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Re: Front Suspension Shims.

Post by gtcse8 » Sat Apr 29, 2017 10:15 am

Steve did you decide upon if or what shims you might need?

I have now found my New ones, and a handful of used.

Mark


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Re: Front Suspension Shims.

Post by Rev Light » Sat Apr 29, 2017 11:53 am

Thank Mark, but.......

Actually, I don't need any at all. I took my Scimitar down to the local tracking station, explained my concerns with regard to camber and tyre wear, and got it tracked and adjusted.

My Camber was actually within limits (-0.4, and -0.5 eg), but my total toe was out by over a degree. With that adjusted, all is well with the world. The car as a whole is straight and true.

This is against a background of new coil overs last year, lots of mucking around with ride height and shock adjustments and a replacement of a very worn king pin over winter on the passenger side.

Compound this with running too low tyre pressures all last year and we are going to get wear on the inside edge of the tyre. They are cheap tyres and are only T rated. I am now going to run about 33 lbs all round taking the advice that if I run modern tyres, I should run modern tyre pressures.

The technician was very knowledgeable and interested, and took the time to discuss the measurements and necessary adjustments.

But at least when it comes time to change tyres, I know the car is fine.

Steve


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Re: Front Suspension Shims.

Post by AJL Electronics » Sat Apr 29, 2017 4:24 pm

Tyre pressures are not relative to the tyres, but to the load. You will be fine with around 26 all round, possibly increase the rear a touch if it understeers.


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Re: Front Suspension Shims.

Post by Rev Light » Sat Apr 29, 2017 5:50 pm

I hear what you are saying. It's a pity that no manufacturer or tyre fitting establishment is prepared to quote recomended tyre pressures for this car.

Does anyone know what 'the maths' is with regard to working it out from first principles, as it were?

Cheers


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