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  • Team Bute
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  eatV8 said:
  xr6ikness said:
Leaf spring rear compared to IRS say no more

    C YA :w00t2:  JEFF

I watched that brittish show top gear today and they reviewed the new C6 Corvette... It's got leaf springs!

Its actually got one leaf spring at the front, and one at the back.....

Transverse leaf springs, front and rear. :nono:

C6 chassis

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OK Dave, since you insisted.

As some who've been on the forum a while will know I have always questioned the benefits of IRS in normal day to day driving in Aussie road conditions.

It is more expensive to manufacture compared to a leaf spring set-up. It is less space efficient compared to leaf springs. It carries a weight penalty compared to leaf springs.

Ultimately, a good IRS, and by that I mean double wishbone, will provide better wheel control and rear end grip. BUT how many people off the race track will ever use or need the ultimate? However swing arm types have trouble matching a leaf spring rear end for wheel control. This is because of camber and toe changes as the suspension works through it's length of travel.

Cro and Junior (who have been in my ef wagon) can attest to the fact that a well set-up leaf spring rear end can more than match the BA's IRS.

My son's XR6T ute, which I drove for a few thousand km before delivering it to him, felt just as secure on the road as any BA sedan I've driven. It did have slight axle hop over corrugations, as does the BA IRS sedans, but it was easily cured with a set of Konis.

  • Team Bute
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One other thing to consider..... not directly associated with handling, but....

The utes have a solid rear axle, and are less likely to suffer the driveline shunt issues associated with the take up in all the universal joints of the half shafts of the IRS.

No shunt in my ute.

  • The Bionic Man - half man-half titanium
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  Turbo6man said:
OK Dave, since you insisted.

As some who've been on the forum a while will know I have always questioned the benefits of IRS in normal day to day driving in Aussie road conditions.

It is more expensive to manufacture compared to a leaf spring set-up. It is less space efficient compared to leaf springs. It carries a weight penalty compared to leaf springs.

Ultimately, a good IRS, and by that I mean double wishbone, will provide better wheel control and rear end grip. BUT how many people off the race track will ever use or need the ultimate? However swing arm types have trouble matching a leaf spring rear end for wheel control. This is because of camber and toe changes as the suspension works through it's length of travel.

Cro and Junior (who have been in my ef wagon) can attest to the fact that a well set-up leaf spring rear end can more than match the BA's IRS.

My son's XR6T ute, which I drove for a few thousand km before delivering it to him, felt just as secure on the road as any BA sedan I've driven. It did have slight axle hop over corrugations, as does the BA IRS sedans, but it was easily cured with a set of Konis.

My XR6 ute has leaf springs and quite frankly I can run rings around an IRS sedan.

Leaf springs may be old fashioned (like pushrods) unmarketable (like solid axle Watts Linkage) and don;t allow the individual wheel to make a completely perfect angle when riding over broken/rippled roads.

However, the leaf spring (especially the way that Ford has refined it in the ute) has the benefit of years of refinement. It is firm and sure footed, not overly affected by extra weight or loads and easy and cheap to modify.

The vast improvements in tyre technology, shock absorbers, suspension bushings etc have really given the leaf rear end a shot in the arm.

It is not a very sexy suspension to sell and this is why it is not popular, particularly with motoring journo's. They have really pushed manufacturers into forms of technology that may be great for a single use (racing) but not on a day to day basis (passenger commuting) The Territory is a classic example of a manufacturer responding to an identifiable criticism in the growth of 4WD's as people movers.

Consider this. A major manufacturer such as Ford/GM/Mercedes etc makes a small volume supercar (GT40/McLaren CL etc) The money expended on the project will never be recouped so they are built as a 'branding tool'.

Who buys them? Not you or I.

Who drives them? Motoring journo's

So who has a significant impact in how cars are made and modified?

Motoring magazines because ultimately a car is just a product and the manufacturer has to use the various forms of media to sell their product.

I like leaf spring/Watts Linkage rear suspensions.

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yeah, they use the product everyday!

do the Divie vans use leaf sprung live rear ends??...I'm guessing yes, as they are based on utes...

Dave.

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  Turbo6man said:
Cro and Junior (who have been in my ef wagon) can attest to the fact that a well set-up leaf spring rear end can more than match the BA's IRS.

That thing was on rails!

I was able to take every corner with comfort at least 15-20km/h more than I'd even dream about in the XRT.

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