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30-09-2007, 10:23 AM
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#11 (permalink) |
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Audi RS4
Join Date: Oct 2005
Location: UK
Posts: 3,272
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Re: How to fit LEDs to the RS4 B7 DRLs
What is the wattage of the originals Andy?.
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Three may keep a secret, if two of them are Dead. Benjamin Franklin After three days men grow weary, of a wench, a guest, and weather rainy. Benjamin Franklin |
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30-09-2007, 12:27 PM
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#12 (permalink) |
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enthusiast
Join Date: Nov 2006
Location: Kent
Posts: 324
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Re: How to fit LEDs to the RS4 B7 DRLs
[ QUOTE ]
I going to get some too. How much were they all incl? Also if you need someone with VAGCOM to reset/clear that fault code, just give me shout. (Always in/around Kent). [/ QUOTE ] Under £30 all in .. Thanks for the VAGCOM offer, I'll see if Daz is in today, if not I will send you a PM John - 21watt the original bulb. I followed a mate in a Van past a Scammer van on the A21 ... he said the LEDs really show up nice. The resistors do get hot, but not more than the rest of then engine bay. [img]/ubbthreads/images/graemlins/169144-ok.gif[/img]
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RS4 Avant 2007 http://www.youtube.com/watch?v=pdMIpkfVIOM Sold Vectra VXR(272 bhp) Porsche 2001 996 C4 Tip |
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30-09-2007, 06:18 PM
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#13 (permalink) |
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enthusiast
Join Date: Nov 2006
Location: Kent
Posts: 324
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Re: How to fit LEDs to the RS4 B7 DRLs
Little update.
popped to Daz to plug in the VAGCOM. Well no fault found or recorded. So when I arrived home I put back in the 21w bulb and bingo.. On start up it now say the RIGHT headlight is not working. So the car is very clever to know if a bulb is there or not. So you can either start with DRL off, OR just start see the message which disappears almost immediately. I am happy to see the message because the car is so cool with the LEDs. The resistor is totally necessary, otherwise the bulb out icon stays. PIX of me and DAz,with DRLs on BTW thanks Daz for the help [img]/ubbthreads/images/graemlins/smile.gif[/img] 
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RS4 Avant 2007 http://www.youtube.com/watch?v=pdMIpkfVIOM Sold Vectra VXR(272 bhp) Porsche 2001 996 C4 Tip |
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02-10-2007, 08:43 PM
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#14 (permalink) |
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enthusiast
Join Date: Nov 2006
Location: Kent
Posts: 324
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Re: How to fit LEDs to the RS4 B7 DRLs
A further twist .. at night, if you leave the lights on auto, the main dipped beam comes on immediately, however, if DRL is on, the bulb icon does not go out .....
But if you turn your lights to OFF, so the DRL come on at night the bulb out icon goes immediately. So to conclude, I think the resistor is not 100% correct. So I need to check the current the bulb pulls and then work out a new resistor. So we need to do a bit of Ohm's law Ohm's law predicts the current in an (ideal) resistor (or other ohmic device) to be applied voltage divided by resistance: I = V/R where I is the current, measured in amperes V is the potential difference measured in volts R is the resistance measured in ohms
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RS4 Avant 2007 http://www.youtube.com/watch?v=pdMIpkfVIOM Sold Vectra VXR(272 bhp) Porsche 2001 996 C4 Tip |
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03-10-2007, 08:30 AM
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#16 (permalink) |
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Shank's Pony
Join Date: Jun 2005
Posts: 19
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Re: How to fit LEDs to the RS4 B7 DRLs
[ QUOTE ]
So to conclude, I think the resistor is not 100% correct. So I need to check the current the bulb pulls and then work out a new resistor. So we need to do a bit of Ohm's law Ohm's law predicts the current in an (ideal) resistor (or other ohmic device) to be applied voltage divided by resistance: I = V/R where I is the current, measured in amperes V is the potential difference measured in volts R is the resistance measured in ohms [/ QUOTE ] The best way to do this is to measure the current taken by the old filament bulb, and subtract the measured current taken by the LED replacement, then use ohms law to work out the resistor value. You normally cannot measure the resistance of the LEDs using an ohm meter as they are semiconductors. Also, you cannot measure the resistance of a filament bulb accurately because the resistance will increase as the filament heats up. |
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03-10-2007, 09:53 AM
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#17 (permalink) |
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enthusiast
Join Date: Nov 2006
Location: Kent
Posts: 324
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Re: How to fit LEDs to the RS4 B7 DRLs
Not a lot of point as the DRLs are for day time and are off at night [img]/ubbthreads/images/graemlins/confused.gif[/img]
[ QUOTE ] That looks good. Any night time shots? Am looking to do this on my S3 as DRLs look horrid in yellow. [/ QUOTE ]
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RS4 Avant 2007 http://www.youtube.com/watch?v=pdMIpkfVIOM Sold Vectra VXR(272 bhp) Porsche 2001 996 C4 Tip |
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03-10-2007, 09:58 AM
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#18 (permalink) |
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enthusiast
Join Date: Nov 2006
Location: Kent
Posts: 324
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Re: How to fit LEDs to the RS4 B7 DRLs
Rupert, I am now actually thinking the Audi check system on startup is smart and know that it is not a bulb ... It may send a pulse to check... I don't think a resistor can fool it .. but once running is happy to see the load.
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RS4 Avant 2007 http://www.youtube.com/watch?v=pdMIpkfVIOM Sold Vectra VXR(272 bhp) Porsche 2001 996 C4 Tip |
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03-10-2007, 10:25 AM
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#19 (permalink) |
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Shank's Pony
Join Date: Jun 2005
Posts: 19
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Re: How to fit LEDs to the RS4 B7 DRLs
[ QUOTE ]
Rupert, I am now actually thinking the Audi check system on startup is smart and know that it is not a bulb ... It may send a pulse to check... I don't think a resistor can fool it .. but once running is happy to see the load. [/ QUOTE ] That sounds very plausable, I had forgotten that the check is done even when the lights are off. So possibly a low voltage pulse, if it's less than the LED switch-on voltage then it will see an open-circuit. |
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03-10-2007, 11:40 AM
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#20 (permalink) |
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Porsche GT3
Join Date: Sep 2004
Posts: 11,820
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Re: How to fit LEDs to the RS4 B7 DRLs
[ QUOTE ]
Not a lot of point as the DRLs are for day time and are off at night [img]/ubbthreads/images/graemlins/confused.gif[/img] [ QUOTE ] That looks good. Any night time shots? Am looking to do this on my S3 as DRLs look horrid in yellow. [/ QUOTE ] [/ QUOTE ] Yes, but wanted to gauge how bright they were. |
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