Outer Limits 4x4 Board

Thanks for the offer pete and for the info serg. Dan came over this arv for a few hours and we got heaps of data and measurements of the disco. The 'flex' data collected for the baselines is great. Some of it is quite surprising and my initial thoughts are that we can do a really nice RA and shock ...

Factory build tolerances are plus or minus an inch.

The rubbing happens at full articulation. You either had something limiting articulation or you were not doing things to flex the suspension to the maximum.

With guaranteed no cutting, 245/70/16. Spring lifts have zero affect on tyre clearance.

http://members.shaw.ca/jbarge/tires.html" onclick="window.open(this.href);return false;

Differentials have planetary gears?? Cool. Nothing like hearing advice from people that don't even know how a differential is built. I'm pretty suspect as well. The R&P should go long before the diff unless you are pegged or are you guys talking Sals? If you are such serious wheelers, why are you ...

There are other ways to develop normal forces. I've explained them at least twice in this thread. Read back yourself as repeating myself three times is ridiculous. Your picture is lovely, but that it not what off road surfaces and tyres look like...

I'm also quite sure it has been made clear that I ...

OK, you are seriously an engineer? Look, you can transfer force without friction. "Normal" force. You must understand what that means if you are a mechanical engineer. If you are not capable of understanding this simple point, I give up. Is addition the force on the tyre can exceed weight. I'd draw ...

I read what you wrote and I don't agree with it. Even a square tyre lug biting a square piece of rock can't get friction higher than 1 offroad. The rubber deforms around the rock and slides off. If you have some measurements to prove otherwise I'd like to see it.

Let's pretend you went to school ...

You can't get traction above 1 on-road with 4wd tyres, let alone off road. Normal road tyres on dry tarmac let go around 0.8. If you've got sticky hot tyres on road you can hit a little over 1, but offroad not a snowballs chance in hell. If you have any data on this let me know.

Perhaps you need ...

yes the early CV's are bigger than the later ones, but you can convert to defender CV's which is the biggest stock CV again. But again to get more strength you would go aftermarket CV's or do some sort of conversion.

The problem with the later axles is the shaft is very small (smaller than 10 ...

Going back to the original post I would fit the 24 spline front housing for now, and if you don't plan on using the car for more than daily driving and light trips I would leave it. If you plan on going more serious off road you need to upgrade the centre to a 2 pin, 4 sun gear type (or a locker ...

... it is just so plan stupid when you know it is a dana 60 design diff, that normally start at 28 spline and can go up to something like 40 spline !!!!

Actually Dana 60s usually use 30 spline at the diff, which is only 15% stronger than Rover's 24 spline (with the same materials). You need to go ...

OK, firstly, I'm a mechanical engineer and I don't need to be told the math. A coefficient of friction of 1.0 is not "perfect traction". There is nothing magic about 1 and higher is quite possible. I can guarantee you can easily produce greater force at the wheel surface than the weight on the tyre ...

I'm not saying I go harder and we are not talking about me... I have lockers and big tyres.

I'm saying I personally have seen stock trucks driven sanely break shafts and diffs. These are facts, not theory. I've seen street only driven trucks break diffs. Keep in mind that they are all V8s here ...

A single load to failure test is not the complete story. Low cycle fatigue is what kills shafts.

And sorry, but 1.2 tons is pretty easy when the vehicle weights 2.5 tons..... Go up a steep hill, hit the throttle...

3300 lb-ft / 40:1 gear reduction = 82 lb-ft from the engine.

And exactly what is ...

I've seen bone stock Rangies and Discos break shafts and diffs driving easy to moderate trails without being aggressive.

OK, as a learning exercise... I drew the section in AutoCAD (hopefully correctly...) and it gives a polar section of 0.324, which matches the strength of a 30.0 mm shaft.

http://i2.photobucket.com/albums/y45/Red90rover/Rover%20Halfshafts/calcs2.jpg

http://i2.photobucket.com/albums/y45 ...

KiwiBacon wrote:[They're not completely useless. If you stick to stock size wheels and drive them knowingly you'll be fine.

Not in my experience.

To see how big the shaft needs to be, I plugged in Mal Story's numbers....
http://i2.photobucket.com/albums/y45/Red90rover/Rover%20Halfshafts/calcs.jpg

Maybe someone can check if I screwed up, cause the Polar Section he states for the 24 spline gives a shaft smaller than the minor diameter, which ...

And I was wondering. I don't have any late model 24 spline shafts around. If time allows, I can try and hook up with a friend that has some to take measurements...

What I have.

10 spline end of 10/23 front halfshaft
http://i2.photobucket.com/albums/y45/Red90rover/Rover%20Halfshafts/Rover_Fr_10 ...

OK....

All 10 spline and late model 24 spline stock axles are useless crap. Is this clear?

As are the stock 2 pinion differentials and the late model CV joints.

The only "half decent" stock shafts are the Rover axle "HD" shafts and the Salisbury shafts. Neither of these neck down and they are ...

This is the thread that had the photos: http://carl.outerlimits4x4.com/viewtopi ... c&start=60" onclick="window.open(this.href);return false; All OL photos were lost one day. If Michele finds a copy, probably best to put back on that thread.

TA Performance is in the process of building an all new HP head at lower cost...

http://www.v8buick.com/showthread.php?t=172229" onclick="window.open(this.href);return false;
http://www.flickr.com/photos/wizkid45/sets/72157617480262913/" onclick="window.open(this.href);return false;

You have lost ground to the gauges.

A new turbo is less than $1000.

http://www.paddockspares.com/pp/SHOP_BY ... 00TDI.html

Yes, it is a T25. Don't know if all rebuild kits are the same.

The 35 spline Sals is nice, but it IS quite expensive to do.

People need to stop going overkill on everything. I'm guess this guy does not need that.... Horses for courses.....

A Maxi-drive for a Sals is a good bang for the buck as it retains the stock diff. An ARB plus proper shafts costs quite a ...

Find a used Salisbury and put in a Maxi-Drive.

If it were me...I would do the low range gear set. I run on 34s with the same high range gearing as you with my 200TDI and find it perfect.

zen wrote:besides a you can talk!!just seen you in canada!

Hehe...but I'm not asking questions not related to Australia.

I lived in Australia for 5 years, so have ties to this forum.