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  #71  
Old 13th May 2013, 08:48 AM
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Quote:
Originally Posted by Ratbag View Post
Gidday Folks

It occurred to me that weight in the vehicle, or more specially hanging off the back bumper area, puts greater torque on a lifted vehicle than it does on the same vehicle with no lift.
Not sure about this. My thinking is;

If we are talking only about the torque applied by the weight of the load acting vertically downwards then the torque on the strut would be the same.
Torque is defined as force applied by perpendicular distance (in our case horizontal) from the point at which the torque is being measured. So for lifted and non lifted vehicles the horizontal distance is the same and therefore the torque is the same.

However if you consider loading cases such as braking and accelerating or climbing or descending then the force will no longer be vertical and therefore the lift will result in an increased torque.

I could be completely wrong though as im half asleep at the minute so the brain probably isnt working..... maybe ill have another think in the morning
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  #72  
Old 13th May 2013, 08:56 AM
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Gidday DW

Quote:
Originally Posted by DedmanWalking View Post
Not sure about this. My thinking is;

. . .

I could be completely wrong though as im half asleep at the minute so the brain probably isnt working..... maybe ill have another think in the morning
I know that feeling only too well, mate ...

I really need to draw a mud map of what I am thinking, but far too buggered tonight!
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  #73  
Old 13th May 2013, 10:08 AM
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Quote:
Originally Posted by DedmanWalking View Post
However if you consider loading cases such as braking and accelerating or climbing or descending then the force will no longer be vertical and therefore the lift will result in an increased torque.
Thats spot on. Its the horizontal forces that are acting on the lift blocks that cause the increase in torque on the bolts/captive nuts. Not so much acceleration, lol, at least not in my Foz more braking, cornering & esp hitting potholes, ruts, rocks, etc while climbing a steep track. Thats what I was/am concerned most about.
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  #74  
Old 13th May 2013, 07:15 PM
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The regulations don't stop anyone from making a very capable off-roading Subaru. To be honest i think if you start going extreme with mods to a car that wasn't designed for the purpose in the first place then you just end up with a cascading effect of other problems, e.g. stresses on captive nuts, clearance issues, poor gearing etc. People seem to get a bit obsessive about the biggest tyres and lift, when all the best Subaru's I've seen off-road have a mild lift, roughly 27" tyres and at least one decent LSD. Big tyres and lift might work for a 4WD but i think it makes a Subaru less capable if anything. I think the regulations are about spot on.

I personally consider it more of a challenge to build my car to be capable and legal.

Last edited by Venom; 13th May 2013 at 07:36 PM.
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  #75  
Old 13th May 2013, 08:09 PM
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Quote:
Originally Posted by Venom View Post
The regulations don't stop anyone from making a very capable off-roading Subaru.
Yep its amazing what you can do with a legal Subaru

Quote:
Originally Posted by Venom View Post
People seem to get a bit obsessive about the biggest tyres and lift, when all the best Subaru's I've seen off-road have a mild lift, roughly 27" tyres and at least one decent LSD
Have always thought that going crazy with the tyres is just going to cripple your low range and cripple your off-road ability. Also one of the advantages of a subaru is that it can go places other 4WDs cant due to it low centre of gravity, to much lift and you remove this advantage.

One day i will engineer a rear locking diff and the the foz will be unstoppable.

Quote:
Originally Posted by Venom View Post
I personally consider it more of a challenge to build my car to be capable and legal.
Very true, but sometimes its just a pain in the neck.......
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  #76  
Old 21st November 2013, 06:20 AM
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NSW just increase the tyre size up to 7% of original (old rule was 15mm) for light vehicle.

Cheers,
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  #77  
Old 21st November 2013, 09:12 AM
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I can certainly see where you guys come from.
I'd be one of those people with an extreme lift and mild tyres.(225/70r15).
The lift looks awesome, the vehicle is highand never has clearance issues but it doesn't drive like how it used to onroad. Although it rides, drives and corners much better than the majority of 4wds. ..
I was actually considering decreasing my amount of lift by an inch or so. 115mm in the rear end is a little too extreme. ..
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  #78  
Old 9th March 2015, 09:09 AM
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I just checked the NSW RMS website for the light vehicle modifications session as below, for my understanding is allowed to raise up your vehicle no more than 1/3 of original ride height; for example, my Forester has 225mm ground clearance from the factory which means I can lift my vehicle up to 225/3 = 75mm will be fine and legal, please correct me if I am wrong.

SUSPENSION
Item Modification
12 Altering vehicle ride height by more than one third of the manufacturer’s suspension
travel in the direction of the ride height change.
Examples requiring certification:
• Conversion from coil to leaf springs.
• Any modification to the suspension configuration.
• Fitting a suspension of a different design eg from a different make and model
(eg from coil springs to leaf springs).
• Fabrication of suspension mounting points.
Examples not requiring certification:
• Modification of suspension with components or parts which meet or exceed the
original vehicle manufacturer’s specifications.
• Fitting uprated roll (sway) bars, shock absorbers, springs, struts or manufacturer’s
options for that particular year make and model.
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  #79  
Old 9th March 2015, 04:40 PM
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It's one third of "suspension travel" not one third of ride height.
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  #80  
Old 12th March 2015, 08:35 AM
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Quote:
Originally Posted by Kevin View Post
It's one third of "suspension travel" not one third of ride height.
So can anyone to tell me how much the suspension travel in 2010 Forester XT? Cause I have totally no ideas for it.
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