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Home > Help Needed / General Tech Chat > Help with coilovers, please!

tbonejones

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Hi all,

Would really appreciate some thoughts on this as it's really starting to irritate me. I've got GAZ coilovers on my car and I'm trying to resolve some ride height issues.

Basically, on the offside front the cog is wound higher than the other side, as you can see in the pictures I've attached. The spring is a lot shorter on this side because of how much higher it is. But even so, the side with the higher cog is riding much lower. So to even it out it looks like I have to wind the nearside cog even lower to drop the car on that side.

Am I doing something really wrong? Could the springs be different lengths?

http://farm4.static.flickr.com/3063/578242...9360f6cf5_z.jpg

http://farm3.static.flickr.com/2660/578186...1de37dc64_z.jpg

Edited by tbonejones on 31st May, 2011.


Carlzilla

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Look like different springs to me, or one has pooed itself, could be worth checking to see that they havent siezed, take the springs off and check the damper moves properly.

Edited by Carlzilla on 31st May, 2011.

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wil_h

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I would gues that if you put it on corner weight scales it would be immediately apparant.

I suspect that there is a similar thing happening at the rear meaning that the majority of the weight of the car is across two diagonaly opposed corners (in this case front off-side and rear near-side).

Check that the rear is evenly set. If not, set all corners the same side-to-side as a starting point.

I have a theory that the majority of minis with adjustable heigh suspension are set in such a way.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph



On 2nd Jan, 2013 fastcarl said:

the design shows a distinct lack of imagination,
talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol

On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry.


tbonejones

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On 31st May, 2011 wil_h said:
I would gues that if you put it on corner weight scales it would be immediately apparant.

I suspect that there is a similar thing happening at the rear meaning that the majority of the weight of the car is across two diagonaly opposed corners (in this case front off-side and rear near-side).

Check that the rear is evenly set. If not, set all corners the same side-to-side as a starting point.

I have a theory that the majority of minis with adjustable heigh suspension are set in such a way.


It is pretty much exactly the same problem at the back, but the other way round as you said, so opposing corners.

So I should set all the cogs at the same height first? What will I be looking for then?

Thanks for your help.


wil_h

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Fist thing is to get it on flat ground, check with a spirit level on a long piece of wood.

Without corner weight scales, it will always be a guess. and you will never get the car perfect.

Set them the same side to side higher than you want, then lower it the same amount either side until it is where you want it. always measure the height sill to floor, and don't look at the arches-to-wheel clerance as arches are never the same side to side.

The weight distribution of a mini side-to-side it reasonable, so side to side settings should be similar (they were exactly the same from the factory)

Fastest 998 mini in the world? 13.05 1/4 mile 106mph



On 2nd Jan, 2013 fastcarl said:

the design shows a distinct lack of imagination,
talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol

On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry.


tbonejones

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Brilliant, really appreciate the advice. I'll have a go.


Paul R

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It looks almost like one spring has collapsed as it is nearly compleatly compresses, setting equal hights ect will be a good starting point also check the dampers are at equal set points on the dials side to side maybe set really soft on one hard on the other

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Ben H

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When setting the corners it is best to disconnect the dampers. This is not possible on coilovers, best it to set them to minimum. Before measuring after adjustment it is best to jump up and down on the sill. Also leave it out of gear and with the handbrake off.

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tbonejones

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Right, just spent a couple of hours setting all the cogs at the same height. I did jump on the sills and also took it over a couple of bumps to try and get them to settle.

Results are as below, and as you can see the nearside front and offside rear are still quite a bit higher in comparison.

Can anyone suggest what I should do next?

Just for the record, I bought the car with this suspension on and the ride height was already messed up when I bought it! The kit was put on the car only 2000 miles before I got hold of it.

http://farm6.static.flickr.com/5061/578273...582d6b6f9_z.jpg

http://farm4.static.flickr.com/3352/578273...18932915a_z.jpg


Ben H

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Are the springs interchangeable front to back? I guess the front springs will be a higher poundage. For some reason has a front spring goton the bacn and vice versa?

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

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tbonejones

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I'm not sure if they are interchangeable but I've just counted the amount of coils on the rear suspension from top to bottom and both sides have 15, so it doesn't appear so.

I'm so confused by this and it's really winding me up!


Paul R

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Do you have the twin hole coilover brackets?? The top poaition is about 1.5" higher up than the bottom, if there in the bottom whack them in the top to lower the ride hight

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wil_h

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Interesting. Check the ride height at each end by measuring from the sill lip to the floor at the ends of the sills. Then post up here.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph



On 2nd Jan, 2013 fastcarl said:

the design shows a distinct lack of imagination,
talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol

On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry.


tbonejones

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Member #: 8150
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Sorry, edit... Mixed up the top two.

My findings were...

Offside front: 216mm
Nearside front: 223mm
Offside rear: 248mm
Nearside rear: 243mm

Edited by tbonejones on 31st May, 2011.


tbonejones

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On 31st May, 2011 Paul R said:
Do you have the twin hole coilover brackets?? The top poaition is about 1.5" higher up than the bottom, if there in the bottom whack them in the top to lower the ride hight


I didn't think about this. I'll have a look when I get the wheels off again tomorrow.

Can't wait *oh well*


wil_h

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Is that on 100% flat ground?

If it is I can see whay it ended up so odd. I can't see that from those you will ever get it even unfortunately. Looking at the arches and the differance is more apparant than the figures suggest, and 5mm side-to-side is not horrendus. I'd suggest that the arches are not even height side to side, try and do some meadurements.




On 31st May, 2011 tbonejones said:
Sorry, edit... Mixed up the top two.

My findings were...

Offside front: 216mm
Nearside front: 223mm
Offside rear: 248mm
Nearside rear: 243mm

Fastest 998 mini in the world? 13.05 1/4 mile 106mph



On 2nd Jan, 2013 fastcarl said:

the design shows a distinct lack of imagination,
talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol

On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry.


tbonejones

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Member #: 8150
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On 1st Jun, 2011 wil_h said:
Is that on 100% flat ground?

If it is I can see whay it ended up so odd. I can't see that from those you will ever get it even unfortunately. Looking at the arches and the differance is more apparant than the figures suggest, and 5mm side-to-side is not horrendus. I'd suggest that the arches are not even height side to side, try and do some meadurements.



May not have been 100% but pretty close, I took it up the road to a level area. When I get home from work I'll measure from the bottom of the back windows to the wheel arches, as it is the back which is the most uneven.

I'm not even bothered about getting it absolutely perfect, I just want it looking less wonky!

I guess it'll just be a case of setting them unevenly again to even it out a bit, but I'm a little worried about what that'll mean for the car's handling in the long term.


wil_h

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You really don't want to have it like it was, turning left you'd get understeer and right oversteer.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph



On 2nd Jan, 2013 fastcarl said:

the design shows a distinct lack of imagination,
talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol

On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry.


tbonejones

37 Posts
Member #: 8150
Member

Could camber/caster/toe etc be messing it up? It hasn't been set up properly since I have had it.

Not sure it would make that much difference though, the rear literally has about 2 inches difference in ride height.

Argh, so annoying.


wil_h

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yes, it has 2" differance arch to wheel but only 5mm sill height.

No, caster, camber etc. will not significatly affect ride height.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph



On 2nd Jan, 2013 fastcarl said:

the design shows a distinct lack of imagination,
talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol

On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry.


tbonejones

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Member #: 8150
Member

Hmmm, ok pal, thanks for the advice. Like I said I'll go home later and do some measurements on the arches and post this evening.


tbonejones

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Member

Going to have to hang fire with this. Just opened my passenger door to put my tax disc in and my window spontaneously shattered. Unbelievable.

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