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Old 7th December 2016, 09:08 AM
ainarssems ainarssems is offline
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Join Date: Aug 2010
Location: Rushden, Northants
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Yes works very well without any issues. I just used 0.4mm enamelled copper wire and did about 30 windings at each end. I actually bought a purpose made unit like this first http://www.ebay.co.uk/itm/Immobilize...IAAOSwHaBWidEn There was nothing else in it, just a coil in the plastic box in the middle of which you insert spare key and a little relay on PCB. It was bulky both box and the coil at other end and did not fit well so I just used relay from it and made new coils myself. For the second car I started with nothing and just made 2 coils and used small 12V relay.

At close proximity efficiency is quite good you can look at it as 2 transformers connected by 2 wires and relay. Transponder chip is closer, at better position than it usually is when in the key so that helps as well.
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2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D

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2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure

Last edited by ainarssems; 7th December 2016 at 09:20 AM.
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