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Old 01-09-2006, 10:01   #1 (permalink)
Matthew Maddock
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P38 off-road electrickery info please!

I can't seem to find much about what goes on (technically) when
I loose traction in my P38.

Can someone please tell me what systems there are in place and
how I can use them effectively! I know that there is some form
of electronic traction control, but I'm not sure how this works
(although it seems to!) Is there a CDL? - albeit one that I
cannot select myself.

Any info would be gratefully received.

Cheers,

Matt.
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Old 01-09-2006, 12:01   #2 (permalink)
Richard Brookman
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Re: P38 off-road electrickery info please!

....and Matthew Maddock spake unto the tribes of Usenet, saying...


> I can't seem to find much about what goes on (technically) when
> I loose traction in my P38.
>
> Can someone please tell me what systems there are in place


Traction control on the rear only, as far as I remember (P38, not Vogue).
It's linked to the ABS system, detects if a wheel loses traction and applies
the brake to that wheel, diverting torque to the wheel with the grip. It
works pretty well, though obviously not as well as a full 4-wheel system.

> and
> how I can use them effectively!


You do nothing. There is no "driver input". Works well.

> Is there a CDL? - albeit one that I
> cannot select myself.


There is no CDL as such - there is a viscous coupling between front and rear
shafts which automatically locks up if it detects more than a small amount
of difference in rotational speeds. Works brilliantly, and again totally
automatic.

HTH

--
Rich
==============================
Disco 300 Tdi auto
S2a 88" SW
Tiggrr (V8 trialler)


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Old 01-09-2006, 13:01   #3 (permalink)
Warwick Barnes
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Re: P38 off-road electrickery info please!

The message <dpu4q1$q18$1@nwrdmz01.dmz.ncs.ea.ibs-infra.bt.com>
from Matthew Maddock <matthew.maddock@nospamplease.mmaddock.com>
contains these words:

> I can't seem to find much about what goes on (technically) when
> I loose traction in my P38.


> Can someone please tell me what systems there are in place and
> how I can use them effectively! I know that there is some form
> of electronic traction control, but I'm not sure how this works
> (although it seems to!) Is there a CDL? - albeit one that I
> cannot select myself.


> Any info would be gratefully received.


depends on year got better as time went on, ISTR later 1999? have 4
wheel traction control.

Knew a chap who was getting stuck with excessive front wheel spin where
jap crap was having no trouble, so suggested something wrong, after much
hassle and visiting two or three dealers, the problem was finally
diagnosed as "a less than fully efficient rear differential sir" .A new
diff and the machine was a completly different drive!
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Old 01-09-2006, 14:01   #4 (permalink)
Dougal
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Re: P38 off-road electrickery info please!

Richard Brookman wrote:

> ...and Matthew Maddock spake unto the tribes of Usenet, saying...
>
>>I can't seem to find much about what goes on (technically) when
>>I loose traction in my P38.
>>
>>Can someone please tell me what systems there are in place

>
>
> Traction control on the rear only, as far as I remember (P38, not Vogue).
> It's linked to the ABS system, detects if a wheel loses traction and applies
> the brake to that wheel, diverting torque to the wheel with the grip.


Let's put the cat among the pigeons .... with a standard non-locking
differential when a wheel spins the torque in the system plummets.
Applying the brake to the spinning wheel (traction control as correctly
described above) enables system torque to be regained which is then
available to the wheel with traction. Arguably I'm being pedantic but
that's not 'diversion'!

It's very much like plugging a leak in a pressurised pipe. Plug the leak
and pressure is regained.
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Old 01-09-2006, 15:01   #5 (permalink)
Dave Liquorice
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Re: P38 off-road electrickery info please!

On Mon, 9 Jan 2006 19:13:21 -0000, Richard Brookman wrote:

> Traction control on the rear only, ...
>>
>> and how I can use them effectively!

>
> You do nothing. There is no "driver input". Works well.


There is a driver choice when the TC kicks in. Do you just let it get
on with it or ease of the go pedal a bit in the hope that the reduced
torque will allow all four wheels to grip properly again.

--
Cheers new5pam@howhill.com
Dave. pam is missing e-mail



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Old 01-09-2006, 15:01   #6 (permalink)
Richard Brookman
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Re: P38 off-road electrickery info please!

....and Dougal spake unto the tribes of Usenet, saying...

> Arguably I'm being
> pedantic


I would agree. :-)

--
Rich
==============================
Disco 300 Tdi auto
S2a 88" SW
Tiggrr (V8 trialler)


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Old 01-09-2006, 15:01   #7 (permalink)
Richard Brookman
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Re: P38 off-road electrickery info please!

....and Dave Liquorice spake unto the tribes of Usenet, saying...


> On Mon, 9 Jan 2006 19:13:21 -0000, Richard Brookman wrote:
>
>> Traction control on the rear only, ...
>>>
>>> and how I can use them effectively!

>>
>> You do nothing. There is no "driver input". Works well.

>
> There is a driver choice when the TC kicks in. Do you just let it get
> on with it or ease of the go pedal a bit in the hope that the reduced
> torque will allow all four wheels to grip properly again.


I meant no driver input, as in buttons, levers etc. What you're describing
is good driving.

--
Rich
==============================
Disco 300 Tdi auto
S2a 88" SW
Tiggrr (V8 trialler)


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Old 01-10-2006, 04:01   #8 (permalink)
Natalie Drest
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Re: P38 off-road electrickery info please!


"Warwick Barnes" <warwick.barnes@zetnet.co.uk> wrote in message
news:2006010920342869824@zetnet.co.uk...
> The message <dpu4q1$q18$1@nwrdmz01.dmz.ncs.ea.ibs-infra.bt.com>
> from Matthew Maddock <matthew.maddock@nospamplease.mmaddock.com>
> contains these words:
>
>> I can't seem to find much about what goes on (technically) when
>> I loose traction in my P38.

>
>> Can someone please tell me what systems there are in place and
>> how I can use them effectively! I know that there is some form
>> of electronic traction control, but I'm not sure how this works
>> (although it seems to!) Is there a CDL? - albeit one that I
>> cannot select myself.

>
>> Any info would be gratefully received.

>
> depends on year got better as time went on, ISTR later 1999? have 4
> wheel traction control.


Depends on model too. My Australian poverty pack '98 4.0 p38 seems to have
no rear traction control at all, certainly I've been in situations where
it's been needed & had rear wheelspin but no telltale on the dash showing
rear diff lockup activity (the manual describes this as happening when rear
spin occurs, but my owners manual also covers the HSE).
Very disappointing, I was embarassed by the Japs as well...


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