 | Home > Td5 > TD5 52mm Rev Counter cost !! |
 
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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
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20th Nov 2015 9:24pm |
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| shaggydog Member Since: 12 Aug 2012 Location: Kent Posts: 3347  
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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  |
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20th Nov 2015 9:28pm |
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| shaggydog Member Since: 12 Aug 2012 Location: Kent Posts: 3347
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Learn something every day
 Running Restoration Thread http://www.defender2.net/forum/post323197.html#323197
Self confessed mileage hunter |
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20th Nov 2015 9:45pm |
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| gazman Member Since: 17 Aug 2015 Location: Liverpool Posts: 652 
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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 |
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20th Nov 2015 10:48pm |
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| rallysteve Member Since: 10 Feb 2014 Location: Cumbria Posts: 2237 
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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
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21st Nov 2015 6:51am |
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| gazman Member Since: 17 Aug 2015 Location: Liverpool Posts: 652
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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 |
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21st Nov 2015 7:54am |
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| chinnus Member Since: 24 Aug 2012 Location: UK Posts: 119 
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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?? |
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21st Nov 2015 12:49pm |
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| Anderzander Member Since: 08 Feb 2011 Location: Lancashire Posts: 1000
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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 ?
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21st Nov 2015 1:21pm |
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| miker Member Since: 13 Sep 2015 Location: Surrey Posts: 1763 
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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!!
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21st Nov 2015 1:31pm |
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| MaxRPM Member Since: 15 Jan 2013 Location: South Staffs Posts: 1114 
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Unfortunately the TD5 requires a dedicated tachometer. |
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23rd Nov 2015 9:18am |
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| rallysteve Member Since: 10 Feb 2014 Location: Cumbria Posts: 2237
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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 |
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23rd Nov 2015 10:43am |
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| T1G UP Member Since: 08 Dec 2009 Location: Bath Posts: 3101 
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I got one for sale
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23rd Nov 2015 10:51am |
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| Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6611 
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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 |
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23rd Nov 2015 10:58am |
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| rallysteve Member Since: 10 Feb 2014 Location: Cumbria Posts: 2237
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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 |
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23rd Nov 2015 11:52am |
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