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K3 Part 2 
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Ready for SVA

Joined: Sat May 05, 2012 9:24 am
Posts: 356
Location: Norwich
GTM: Libra
Post Re: K3 Part 2
Dunno about the K3, but on my old libra (& I’m guessing the weight won’t be too different) I followed the thread on here which had all the calculations on. So when i bought the Protech shocks, i went for 215 front & 325 rear. It rode like my Renault scenic!! Soft, wallowy & rolling round the corners! I ended up (after trying about 3 sets of springs) with 225 front & 400 rears. This was for road use. The original builder (Dave Boud) used 450lb rears but was more track orientated.
At the end of the day, you can do all the calculations you want.... but its how it feels & handles that matters. I personally wouldn’t recommend going softer at the rear.

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Wed Oct 21, 2020 11:01 pm
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Part built GTM

Joined: Sun Oct 08, 2017 7:08 pm
Posts: 78
Location: Accrington, Lancs.
GTM: K3
Post Re: K3 Part 2
Thanks Sven, that's very helpful. I have read most of the Libre threads regarding spring rates etc and yes I think they'd be similar weight wise. I was thinking I might get a few quid back for the 9 inch springs but I'm tempted to lop an inch off each one and see how the car sits even though that will increase the spring rates a bit more.


Thu Oct 22, 2020 12:27 am
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On the Road
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Joined: Sun Oct 19, 2014 10:10 pm
Posts: 944
Location: Bristol
GTM: Spyder
Post Re: K3 Part 2
Be careful comparing spring rates between Libra and K3. Although weights are similar the units are at a steep angle in the Libra set up and more or less vertical in the K3. The angle in itself isn't necessarily an issue but the movement ratio might be and steeper angles often suggest a different movement ratio. You need to measure how much the spring will compress for a given vertical movement of the wheel. If the movement ratio is similar then you can safely refer to data from the Libra but not sure if it is.


Thu Oct 22, 2020 9:39 am
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Part built GTM

Joined: Sun Oct 08, 2017 7:08 pm
Posts: 78
Location: Accrington, Lancs.
GTM: K3
Post Re: K3 Part 2
sanzomat wrote:
Be careful comparing spring rates between Libra and K3. Although weights are similar the units are at a steep angle in the Libra set up and more or less vertical in the K3. The angle in itself isn't necessarily an issue but the movement ratio might be and steeper angles often suggest a different movement ratio. You need to measure how much the spring will compress for a given vertical movement of the wheel. If the movement ratio is similar then you can safely refer to data from the Libra but not sure if it is.



Yes I understand the Libre rear suspension is very different to the K3.

Sorry for the late reply. I kept getting logged out last night and I gave up in frustration :x


Fri Oct 23, 2020 1:50 pm
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Part built GTM

Joined: Sun Oct 08, 2017 7:08 pm
Posts: 78
Location: Accrington, Lancs.
GTM: K3
Post Re: K3 Part 2
Haven't done anything about the springs yet. However the wiring needed tidying up so decided to get on with that instead. The coilover bracket on the passenger side front touches the heater box even after trimming the casing right back so some metal had to be taken off the bracket to allow the cables to pass through.


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Wed Oct 28, 2020 8:51 am
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Ready for SVA
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Joined: Thu Jun 27, 2013 11:32 pm
Posts: 388
Location: Norfolk
GTM: K3
Post Re: K3 Part 2
Nice work
I will have to check out this on my car
And see if I have the same problem when i get round to changeing my k3 over to coilovers i have the brakes gust need to get it done

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Thu Oct 29, 2020 10:51 am
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Part built GTM

Joined: Sun Oct 08, 2017 7:08 pm
Posts: 78
Location: Accrington, Lancs.
GTM: K3
Post Re: K3 Part 2
I could have just dragged the cables over the top of the coilover but it would look a mess. There's no issue on the drivers side as there's nothing on the bulkhead there. The inner wheel arches need cutting back some to clear the top mounting bush too. On the plus side all the lights work as does the heater and wipers and the dashboard. I finally got the fuel gauge hooked up and found the tank is nearly full! It might be a bit stale now so I'll take out a gallon at a time and bung it in my Suzuki as its too dear to waste :!: I really would like to get rid of the Metro fuel tank but that's a job for next year.


Fri Oct 30, 2020 12:45 am
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Ready for SVA
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Joined: Thu Jun 27, 2013 11:32 pm
Posts: 388
Location: Norfolk
GTM: K3
Post Re: K3 Part 2
Quote:
I could have just dragged the cables over the top of the coilover but it would look a mess. There's no issue on the drivers side as there's nothing on the bulkhead there.


I might have the same problem on the drivers side I whent and put in some cable's for the radio on that side.

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I cannot guarantee against unauthorized modifications or improper use of this information
I assume no liability for property damage or injury incurred as a result of any of the information contained in this
I recommend safe practices


Fri Oct 30, 2020 10:44 am
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Part built GTM

Joined: Sun Oct 08, 2017 7:08 pm
Posts: 78
Location: Accrington, Lancs.
GTM: K3
Post Re: K3 Part 2
I don't think you'll have an issue on the drivers side. This pic isn't very good but it might help. I'll take a few more next time I go to the workshop.


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Fri Oct 30, 2020 9:31 pm
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Part built GTM

Joined: Sun Oct 08, 2017 7:08 pm
Posts: 78
Location: Accrington, Lancs.
GTM: K3
Post Re: K3 Part 2
Went to start her up in prep for moving her to my mates garage and she wouldn't start. I buggered around with the wiring for three days to no avail. The circuit diagrams in my Rover Metro manual are close but not close enough but I finally tracked down the correct circuit diagram on the Lotus 7 and Caterham Club site. Problem traced to a bad solder joint in the loom where it was extended. I tidied the loom up a while ago and wrapped it with fresh tape and I must have stressed that joint somehow. Anyway problem solved and she cracked up a treat. Next year when the sub frames come out for replacing I'll have a new loom ready to go in.


Mon Nov 02, 2020 9:48 pm
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Part built GTM

Joined: Sun Oct 08, 2017 7:08 pm
Posts: 78
Location: Accrington, Lancs.
GTM: K3
Post Re: K3 Part 2
And here she is in my mates paint booth ready for some tlc.


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Sat Nov 07, 2020 12:39 am
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