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dorsetsmith



Member Since: 30 Oct 2011
Location: South West
Posts: 4554

on TD5 the input to the Rev Counter is from ECU ,not the ALT
Post #474723 20th Nov 2015 9:24pm
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shaggydog



Member Since: 12 Aug 2012
Location: Kent
Posts: 3346

United Kingdom 1991 Defender 110 200 Tdi USW Arles Blue
Ah fair enough.

Does the alternator not have a W-output you could use then? Running Restoration Thread http://www.defender2.net/forum/post323197.html#323197

Self confessed mileage hunter Very Happy
Post #474724 20th Nov 2015 9:28pm
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roel



Member Since: 08 Aug 2009
Location: Lelystad
Posts: 2039

Netherlands 2003 Defender 90 Td5 PU Caledonian Blue
no it hasn't. Roel

1984 90 2.5 na Diesel - RR V8 (1994-2001)
1997 Camel Trophy Discovery 300TDI (2001-2009)
2005 G4 Discovery III 4.4 V8 (2008-2018) It's gone but it still hurts.
2003 90 Td5 (2009-now)
Post #474726 20th Nov 2015 9:35pm
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shaggydog



Member Since: 12 Aug 2012
Location: Kent
Posts: 3346

United Kingdom 1991 Defender 110 200 Tdi USW Arles Blue
Learn something every day Thumbs Up Running Restoration Thread http://www.defender2.net/forum/post323197.html#323197

Self confessed mileage hunter Very Happy
Post #474732 20th Nov 2015 9:45pm
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gazman



Member Since: 17 Aug 2015
Location: Liverpool
Posts: 652

United Kingdom 2003 Defender 90 Td5 HT Alpine White
dorsetsmith wrote:
on TD5 the input to the Rev Counter is from ECU ,not the ALT


oh poo poo. I was close to ordering a w type one. Thank god i didnt! 2014 - current ..... 2003 defender td5 90 (my car)
2009 - current .... 2005 zx10r
Post #474752 20th Nov 2015 10:48pm
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rallysteve



Member Since: 10 Feb 2014
Location: South Yorks
Posts: 2194

United Kingdom 2002 Defender 110 Td5 DCPU Keswick Green
Pretty sure you can access the 'w' terminal if you remove the plastic on the back of the alternator. Its not a dedicated terminal anyway as such, just a point to pick up the un rectified ac waveform generated by the alternator. 02' 110 TD5 Double Cab Rebuild Thread
84' 90 3.9 V8 Caged Pickup Build Thread


Mobile Diesel Heater Build Thread
Post #474770 21st Nov 2015 6:51am
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gazman



Member Since: 17 Aug 2015
Location: Liverpool
Posts: 652

United Kingdom 2003 Defender 90 Td5 HT Alpine White
Hmm. Maybe this is worth me doing some digging. I'm going to add a homemade binnacle to the top of the dash between the fans so it doesn't matter if it's the same as the ones in the normal clocks or not. Maybe it's worth a punt on a really cheap one and I'll try it 2014 - current ..... 2003 defender td5 90 (my car)
2009 - current .... 2005 zx10r
Post #474778 21st Nov 2015 7:54am
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chinnus



Member Since: 24 Aug 2012
Location: UK
Posts: 119

2001 Defender 90 Td5 ST Coniston Green
phoned them up and boltonbits are selling them for that price as they have run out of stock.....

Why they dont just remove the auction??
Post #474825 21st Nov 2015 12:49pm
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Anderzander



Member Since: 08 Feb 2011
Location: Lancashire
Posts: 999

United Kingdom 
Quite a lot of sellers do that. It must be easier to change the price twice than end the listing and open a new one - perhaps avoids any relisting fees too ?
Post #474836 21st Nov 2015 1:21pm
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miker



Member Since: 13 Sep 2015
Location: Surrey
Posts: 1758

United Kingdom 1999 Defender 110 Td5 CSW Rioja Red
got it in one! They can edit listings for free/cheap rather than paying for a new listing. Also means it stays in peoples watch lists, and if someone buys one at that price, all the better!!
Post #474842 21st Nov 2015 1:31pm
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MaxRPM



Member Since: 15 Jan 2013
Location: South Staffs
Posts: 1114

England 
shaggydog wrote:
You could try this?

http://www.ebay.co.uk/itm/Tachometer-0-600...XQVERSzrT~

I bought one for my Tdi which only goes up to 4k but must confess I haven't fitted it yet.


Unfortunately the TD5 requires a dedicated tachometer.
Post #475351 23rd Nov 2015 9:18am
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rallysteve



Member Since: 10 Feb 2014
Location: South Yorks
Posts: 2194

United Kingdom 2002 Defender 110 Td5 DCPU Keswick Green
Not quite sure where the basis for the blanket opinion that the td5 can only be fitted with a genuine tachometer.

As i mentioned the 'w terminal' can be tapped into on the alternator to run any tach designed for diesel engines with a tacho feed. There should be loads of choice in the marine world.

Second option is the use of some pretty simple electronics connected to the ECU pin 19 and the use of a petrol engine tachometer. Main issue with this is the RPM scale will be usually 8000rpm max.

Steve 02' 110 TD5 Double Cab Rebuild Thread
84' 90 3.9 V8 Caged Pickup Build Thread


Mobile Diesel Heater Build Thread
Post #475374 23rd Nov 2015 10:43am
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T1G UP



Member Since: 08 Dec 2009
Location: Bath
Posts: 3101

England 2011 Defender 110 Puma 2.4 XS CSW Orkney Grey
I got one for sale
Post #475378 23rd Nov 2015 10:51am
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Martin
Site Admin


Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6463

United Kingdom 2015 Defender 90 Puma 2.2 XS CSW Montalcino Red
The Td5 rev counter signal is an emulated 4-cylinder pulse so it should be possible to fit a non-factory rev counter, set to 4 cylinder.

It might be necessary to do some level shifting to adapt voltage levels but nothing impossible. The Td5 pulse is 0-5V and the gauge might expect 12V pulses.  1988 90 Td5 NAS soft top
2015 D90 XS SW
Post #475379 23rd Nov 2015 10:58am
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rallysteve



Member Since: 10 Feb 2014
Location: South Yorks
Posts: 2194

United Kingdom 2002 Defender 110 Td5 DCPU Keswick Green
Martin is correct, a simple transistor circuit is all that is really required to convert the 5v 50% duty factor square wave produced by the ECU to a 12v signal needed by coil connected petrol tachometers. This is quite common in petrol engine vehicles fitted with aftermarket ECUs (e.g. megasquirt) so a quick Google search yields the correct circuit.

Steve 02' 110 TD5 Double Cab Rebuild Thread
84' 90 3.9 V8 Caged Pickup Build Thread


Mobile Diesel Heater Build Thread
Post #475389 23rd Nov 2015 11:52am
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