Hi new td5 only has front wheel drive

thebiglad · Feb 3, 2013

Quin said:
Okay I think I understand. Thank you all for your input and patience. Now how do I check the traction control??? Are there sensors on the wheels diffs transfer box????

The TC system uses the four abs wheel sensors.

Quin · Feb 3, 2013

Okay thanks. If the abs sensors weren't working right wouldn't the abs light be on and if there is a problem with tc wouldn't the tc light or a management light come on?

HenryD · Feb 4, 2013

Quin said:
Okay thanks. If the abs sensors weren't working right wouldn't the abs light be on and if there is a problem with tc wouldn't the tc light or a management light come on?

Do the Abs/tc/hdc lights come on with the ignition then go out when started?,if they do does the Tc light come on when your front wheels are spinning as it should?,its not unknown for folk to dick about with the lights to please an mot tester.

Quin · Feb 4, 2013

Yes all lights come on when I turn it on and go off as it should but no lights come on when it is stuck and just spinning the wheels. If I hold the revs at 2500rpm I can dig 2 nice holes with the front wheels and the back don't move.

HenryD · Feb 4, 2013

Quin said:
Yes all lights come on when I turn it on and go off as it should but no lights come on when it is stuck and just spinning the wheels. If I hold the revs at 2500rpm I can dig 2 nice holes with the front wheels and the back don't move.

There is deffo something wrong then,Tc light should be on with associated mechanical buzzing/grinding noises ,you need to find someone with Hawkeye/Nanocom to check what faults its showing,have you checked that the Abs is working by trying to lock up the wheels on loose ground,I suspect its not though regardless of warning light status

ricc · Feb 4, 2013

fink you need to get hold of a copy of the instruction book and read it.....once you know whats supposed to happen and why youll have arf a chance of telling whether the lectronic gubbins is workin or not.

first off ,if it spins front wheels an a slippery slope, turn it round and reverse up to see if it spins the rear wheels.

Quin · Feb 6, 2013

I know that on a 4x4 all the wheels are driven lol or so I thought... No worries will sort it somehow

Dr_evil · Feb 6, 2013

All wheels have drive to them but on an open diff only one wheel has drive at a time

goonarmy · Feb 6, 2013

Dr_evil said:
All wheels have drive to them but on an open diff only one wheel has drive at a time

IF traction is broken

Dr_evil · Feb 6, 2013

goonarmy said:
IF traction is broken

No cos it would be impossible for both to be driven at the same time on an open. It may look like they are as both are powered at a similar rate with drive swapping rapidly between but open diff one will always have no drive and one will have. It's just the way they work as the spiders don't lock, tc just brakes a wheel making the diff switch to the wheel with grip in order to try and keep power down

goonarmy · Feb 6, 2013

Dr_evil said:
No cos it would be impossible for both to be driven at the same time on an open. It may look like they are as both are powered at a similar rate with drive swapping rapidly between but open diff one will always have no drive and one will have. It's just the way they work as the spiders don't lock, tc just brakes a wheel making the diff switch to the wheel with grip in order to try and keep power down

Wheels or axles?

Dr_evil · Feb 6, 2013

goonarmy said:
Wheels or axles?

Both unless he has a cdl in which case can split drive to axles 50/50 on a full time basis but not able to split to wheels 50/50 as open diff will always differentiate power between to try and keep the wheel that's got less grip spinning faster. I.e. outer wheel needs to spin faster than inner when cornering so diff sends power to that one and stops sending to inner so one slows one speeds up unlike with locked axle that would cause a jerky turn

goonarmy · Feb 6, 2013

Understand the turning circle issue but thought discos were 40:60 f-r? So cant be one wheel drive

Dr_evil · Feb 6, 2013

goonarmy said:
Understand the turning circle issue but thought discos were 40:60 f-r? So cant be one wheel drive

It would split 60% of torque to the rear in that case through the centre diff but the diff in axle only splits one way if open as drive alternates between the two sides rapidly depending on which wheel has the grip

goonarmy · Feb 6, 2013

So one wheel per axle drive then?

Dr_evil · Feb 6, 2013

goonarmy said:
So one wheel per axle drive then?

Yeah basically that's why if stuck and you have one wheel in air and look at what's being driven when putting foot down only one will spin

HenryD · Feb 6, 2013

Dr_evil said:
Yeah basically that's why if stuck and you have one wheel in air and look at what's being driven when putting foot down only one will spin

Unless of course the traction control is working which would brake the spinning wheel and send power to the other one,which is the op's problem,his TC on his Disco aint working !

Dr_evil · Feb 6, 2013

HenryD said:
Unless of course the traction control is working which would brake the spinning wheel and send power to the other one,which is the op's problem,his TC on his Disco aint working !

I was just explaining open diffs to goon wasn't on about the OP.

jamesmartin · Feb 6, 2013

goonarmy said:
Understand the turning circle issue but thought discos were 40:60 f-r? So cant be one wheel drive

where did 40-60 come from ?

Dr_evil · Feb 6, 2013

jamesmartin said:
where did 40-60 come from ?

No idea where he got the figure from, I always thought they were split 50-50

Hi new td5 only has front wheel drive

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