andrewturner
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| posted on 25/5/07 at 05:18 PM |
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IRS or Live axle
I have just started my build and at the point where I need to decide which way to go I have the Escort diff, but am not set on the live axle. I will
be using the car for fun drives no racing, whats the verdict?
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JAG
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| posted on 25/5/07 at 05:28 PM |
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Live axle everytime 
They're simple, robust and give great handling.
The IRS set-ups usually give a better ride but not much else unless you really know how to set them up and are driving 10 tenths on a race circuit
IMHO of course  
Justin
Who is this super hero? Sarge? ...No.
Rosemary, the telephone operator? ...No.
Penry, the mild-mannered janitor? ...Could be!
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Fatgadget
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| posted on 25/5/07 at 05:41 PM |
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Locost too.
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blakep82
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| posted on 25/5/07 at 06:00 PM |
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i'd always go live axle, but irs does have distinct advantages, but only if your really going for it, i racing i think.
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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britishtrident
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| posted on 25/5/07 at 06:08 PM |
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With live axle you can always convert to De Dion later without major work.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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ScotJebus
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| posted on 25/5/07 at 06:37 PM |
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have a look back and them are massive debates on what to go for etc they all have advantages and disadvantages it all depends on your budget, needs
and skill
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blakep82
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| posted on 25/5/07 at 06:50 PM |
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quote:
Originally posted by britishtrident
With live axle you can always convert to De Dion later without major work.
don't you mean IRS?
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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MikeR
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| posted on 25/5/07 at 07:19 PM |
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IRS would need a cage building, wishbones, hubs etc.
De-dion reuses the trailing arms. In theory you 'just' need to attach the diff (brackets 15ish quid from MNR) and get / make a dedion
axle.
done.
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kb58
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| posted on 25/5/07 at 07:46 PM |
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Yup, do a search, it's been beaten to death over and over, with no definite conclusion. It's all about what you want, what you can afford,
and your abilities.
Mid-engine Locost - http://www.midlana.com
And the book - http://www.lulu.com/shop/kurt-bilinski/midlana/paperback/product-21330662.html
Kimini - a tube-frame, carbon shell, Honda Prelude VTEC mid-engine Mini: http://www.kimini.com
And its book -
http://www.lulu.com/shop/kurt-bilinski/kimini-how-to-design-and-build-a-mid-engine-sports-car-from-scratch/paperback/product-4858803.html
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DavidM
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| posted on 25/5/07 at 07:54 PM |
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Live axle and a bit of padding under your a*se.
David
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britishtrident
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| posted on 25/5/07 at 07:54 PM |
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The definite conclusion there is no conclusion except live axles aren't that bad on smooth surface but aren't as good as IRS or De Dion.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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Angel Acevedo
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| posted on 25/5/07 at 10:47 PM |
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Build two,
One live axle one IRS.
Drive the **** out of them and decide....
Beware of what you wish.. for it may come true....
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JB
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| posted on 26/5/07 at 05:19 AM |
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Axles
I would go live axle. Its simple, light, cheap and you will not really notice the difference over an IRS.
However......... put effort into getting as much axle movement as possible then you can run long soft springs........ thats the secret with a live
axle.
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RK
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| posted on 26/5/07 at 11:34 AM |
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I gather it depends on the quality of your roads and whether you want to race 750 or not. No matter how bad you think your UK roads are, they will not
be anywhere near as bad as here due to the weather - extreme cold and extreme hot.
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NS Dev
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| posted on 28/5/07 at 10:36 AM |
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RK is exactly right, a quick breakdown is as follows:
LIVE AXLE:
+ great handling on smooth roads, generally easy to find useful diff ratios, brakes etc. 7's were designed for live axle and the chassis has
nodes in the right places to take the loads from this setup.
- bouncy on bumpy roads, with wheelspin coming and going as it does so. Needs decent dampers and wisely weighted springs to control it, due to the
sprung to unsprung weight ratio at the rear of the car being unfavourable
WISHBONE IRS
+ good wheel control over bumps, can be set up to give good tyre temps at any track, gives dampers an easier life (so can generally use cheaper
ones)
- more expensive, harder to get good diff ratios for irs type diffs, much harder to set up, easy to cock up the setup, HEAVIER (IRS has less unspring
weight but is actually heavier in terms of overalll weight)
DE-DION
+ all the plus points of live axle, especially pointing out that fact that the 7 type chassis was designed to have the forces fed in where a live axle
(or de-dion) is mounted, wishhbone irs generally needs less than ideal structures to feed the loads in nicely. The lightest setup of all. low unsprung
weight, simple to setup, easy to build.
- ............none really. Maybe a slight lack of adjustability, but who needs it??????
In case you think I am biased, I actually have a wishbone IRS setup, but if building from scratch would go de-dion.
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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MikeR
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| posted on 28/5/07 at 07:04 PM |
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and he keeps pushing me down de-dion 
(despite the fact i've got live axle ready to do in and de-dion needs some minor mods + the de-dion axle welding up!)
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