quick rack

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classicswede
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quick rack

Post by classicswede » 22 Nov 2013 12:36 pm

Is there any interest in a bolt in quick rack with a reduced number of steering wheel turns lock to lock. I was thinking of going to around 2.2-2.5 turns lock to lock.

These would be a direct bolt in replacement with no need to cut and weld any steering joints etc and would be totally plug and play.

Price wise I expect to be in the area of £250-300 maximum.
Dai

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Chris_C
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Re: quick rack

Post by Chris_C » 22 Nov 2013 02:18 pm

Yes, provided that

a: Total rack travel remains the same (I can make a 1 turn lock to lock rack out of a standard 300 one, by welding half the rack up)
b: Geometry remains the same. Ball joint to ball joint distance, and ball joint to column pick up distance.

So far I've not found a rack that will do both of those.
'89(F) 340 GL F7R (ex B172k) - Fake -> SBKV 300 Runner Up 08, 12 - NASLR Time 15.7secs
'03 S60 D5 SE, '91 (J) MX5
Ex:
'91(H) 340 GL B14.4E - Kar; '88(F) 360 GLT B200E - Jet -> BKV 300 Runner Up 09; '89(G) 360 GLT B200E - Beast

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mac
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Re: quick rack

Post by mac » 22 Nov 2013 03:56 pm

To significantly affect lock to lock whilst preserving OE geometry, and keeping acceptable input forces you would need to increase the diameter of the pinion to allow an increase in tooth number (even this will raise steering effort). This would also require a redesign and a size increase of the pinion housing - even if the rack itself was the same.

If the intention is to produce the same effect by reducing the length of the steering arm on the strut and lengthening the track rods you will compromise Ackerman.

Just a thought! - Mac.
87 3door DL 1.4 58k - 88 3door DL 146k - 88 5door Redline 1.7 52k - 12 XC70 SELux AWD D5 22k
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Chris_C
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Re: quick rack

Post by Chris_C » 22 Nov 2013 05:13 pm

mac wrote:To significantly affect lock to lock whilst preserving OE geometry, and keeping acceptable input forces you would need to increase the diameter of the pinion to allow an increase in tooth number (even this will raise steering effort).
Exactly, although I don't think on a car with rebuilt or fully working front suspension that would be a problem, Fake is stunningly light to steer now. I'm not sure if you would need to redesign the pinion housing, I know of one car manufacturer in the 70s who fitted several different pinions in the same housing. Certainly on Mk1 racks the pinion housing is much more play withable than later racks (I seem to remember selective shim rather than a crush washer? I'd have to refer to green books) and whilst that would have no effect of pinion size it would give the best starting point for playing.

I'm interested to hear Dai's thoughts.
'89(F) 340 GL F7R (ex B172k) - Fake -> SBKV 300 Runner Up 08, 12 - NASLR Time 15.7secs
'03 S60 D5 SE, '91 (J) MX5
Ex:
'91(H) 340 GL B14.4E - Kar; '88(F) 360 GLT B200E - Jet -> BKV 300 Runner Up 09; '89(G) 360 GLT B200E - Beast

classicswede
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Re: quick rack

Post by classicswede » 22 Nov 2013 08:25 pm

The amount of rack movement would stay the same, if possible a little extra travel would be desirable.

I have looked at a number of racks and there is nothing available out there that is going to work.

The only option I can see and makes the most sense is to have new parts made to fit the original rack. This would also be done by a specialist who has the experience in doing this kind of conversion to other steering racks.

The steering effort needed will be increased, but this is to be expected with any quick rack and they are really only for motorsport use rather than for a road car. I know some drivers are happy to use them on the road but that is not the purpose for them
Dai

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Mcglone7
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Re: quick rack

Post by Mcglone7 » 24 Dec 2013 01:18 pm

I would be interested in that! I find the steering at the moment little bit to long, also driving with it on road conditions wouldn't bother me.

classicswede
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Re: quick rack

Post by classicswede » 02 Apr 2014 01:16 pm

I've not forgotten about this project but have been busy with other things. My concern with it and why I have not pushed forward is the rack will be a uk only part.

For LHD I will have to make both a 340 and 360 type rack.

I will try and push forward with this over summer.
Dai

Please email me directly on dai@classicswede.co.uk

http://www.classicswede.com

phone/text 07824887160

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classicswede
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Re: quick rack

Post by classicswede » 15 Jun 2014 11:52 pm

Work has progressed on this and I should have more details in the next couple of weeks :D
Dai

Please email me directly on dai@classicswede.co.uk

http://www.classicswede.com

phone/text 07824887160

Web shop http://www.classicswede.co.uk/

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kevlar1981
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Re: quick rack

Post by kevlar1981 » 07 Sep 2014 08:13 pm

Dai , I might be interested in one of these racks for my 340 if they come to fruition, keep us updated
thanks kev.

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