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markymoan · Posted: Mon Mar 05, 2007 12:43 Post subject:

But thats abuse, not normal driving Smile

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jonkem · Posted: Tue Mar 06, 2007 0:25 Post subject:

Very interesting about the torque split, that's what I have always heard & assumed. What about the fact that 50% of the drive is still being sent to the front axle and spinning the front driveshafts freely?
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1994 KZJ70 Cruiser (currently filling the garage and causing some head scratching)
1988 MKI 3.1td Hybrid Van (Ex Bobtail)
1991 SWB Fronty 2.8td Hybrid
2000 Astra Estate (work)
2006 VXR Astra
MK1 SR Nova

markymoan · Posted: Tue Mar 06, 2007 9:29 Post subject:

Front and rear are locked together in 4wd, so if the front wheels had no grip then all the power would be going to the rear,
So i assume the drivetrain is made to handle it.
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jonkem · Posted: Wed Mar 07, 2007 0:24 Post subject:

Surely the power can't be proportional as there isn't a diff between front & back? May just be the question of "Shock loading" on the single axle with drive which wouldn't apply when towing on a nice flat campsite.
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1994 KZJ70 Cruiser (currently filling the garage and causing some head scratching)
1988 MKI 3.1td Hybrid Van (Ex Bobtail)
1991 SWB Fronty 2.8td Hybrid
2000 Astra Estate (work)
2006 VXR Astra
MK1 SR Nova

markymoan · Posted: Wed Mar 07, 2007 0:32 Post subject:

Its 100% front and rear, no centre diff.
So as i said if the front wheels had no grip, they would spin at the same speed as the rear which has grip, but all the strain would be on the rear.
Simple if you think about it Wink

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jonkem · Posted: Wed Mar 07, 2007 0:42 Post subject:

The strain, yes of course, but not all the power because 50% is still available to the front Smile

_________________
1994 KZJ70 Cruiser (currently filling the garage and causing some head scratching)
1988 MKI 3.1td Hybrid Van (Ex Bobtail)
1991 SWB Fronty 2.8td Hybrid
2000 Astra Estate (work)
2006 VXR Astra
MK1 SR Nova

markymoan · Posted: Wed Mar 07, 2007 9:47 Post subject:

The power is, if the front is not under load then it is not taking any power from the engine, therefore all the power is available to the rear.
What you say is true for a permanant 4x4 that has a % split centre diff.
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dxmedia · Posted: Wed Mar 07, 2007 13:38 Post subject:

If pulling a boat up a ramp, or a caravan which has been bogged down, then as long as the pull is in a straight line, there is no issues with using 4L - the lack of centre diff on high traction surfaces is only an issue when manovering.

Once off the ramp, or pulled stuck load, drop back into 2H and then there should be no issue with steering (although if on a muddy field pulling a caravan, then stay in 4L or 4H since this will be a low traction surface and not cause any windup). If double D clutching, it's quite possible to move from 4L to 2H on the move, so there is no lack of momentum i.e. Pull boat up ramp in a straight line in 4L, then once off the ramp carry on in 2H - I've never seen a boat ramp on a bend so this should work.

Chris.
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jonkem · Posted: Thu Mar 08, 2007 11:11 Post subject:

Marky...ALL the power would go to the front and NOTHING to the back with a centre diff.
If there wasn't any power going to the front then what is driving the front half of the transfer case, front diff, front half shafts & front drive shafts? All at the same speed as the rear. Wink

_________________
1994 KZJ70 Cruiser (currently filling the garage and causing some head scratching)
1988 MKI 3.1td Hybrid Van (Ex Bobtail)
1991 SWB Fronty 2.8td Hybrid
2000 Astra Estate (work)
2006 VXR Astra
MK1 SR Nova

666 · Posted: Thu Mar 08, 2007 12:08 Post subject:

Would it not be safe to say that all the power is split at the transfer box but as only one wheel is being driven, that is where all the torque is?
i would say you would be unlikley to damage anything if you take it easy as at times when off road and your hubs locked you dont always have traction with both axles, if your front axle has no grip but your rear does, do you break anything? no! your driving axle just keeps pushing you forward untill your front axle finds grip!

Hope this makes a little sense

Cheers

Mark
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markymoan · Posted: Thu Mar 08, 2007 12:15 Post subject: