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B7 Forum 2005.5+ Audi A4, Audi RS4 & Audi S4. (Audi A4 Forum, Audi RS4 Forum, Audi S4 Forum)

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post #11 of 45 (permalink) Old 10-16-2007, 10:53 AM
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That is because they are in a line, not in one spot .. I rather have white rather than yellow, DRL

2007 RS4 Avant
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post #12 of 45 (permalink) Old 10-25-2007, 06:58 AM
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Maybe silly question this(so ill apologise first)
Do you need to have Xenon set up front light clusters to be able to have DRLS..
Or can this option be activated on normal front A4(Sline o6) light cluster......
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post #13 of 45 (permalink) Old 11-29-2007, 03:04 PM Thread Starter
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As far as I know only the biXenon units have DRLs, simply because on the non-Xenon models, the DRL space is occupied by the high beam halogen bulb, whereas on the Xenons, the Xenon unit mechanically moves to provide both high and low beam. Hence the space left 'free' by not needing a separate high beam is utilised for the DRL.
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post #14 of 45 (permalink) Old 11-29-2007, 03:08 PM Thread Starter
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FYI, I note that people are often supplied with 10 or even 6 ohm resistors for the DRL bypass. These get extremely hot and are quite unnecessarily low values. A 24 ohm will work fine and suppress the bulb failure - so you clearly don't need to draw the equivalent to the full current of a 21W bulb. Even more FYI, if you fit LED sidelights, you only need a 68 ohm bypass. These values for B7 A4/RS4.
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post #15 of 45 (permalink) Old 11-29-2007, 04:07 PM
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Not true, for a 2007 RS4 B7 you 10 ohm, otherwise an error is shown on startup.

see the tyresmoke thread for full information and pictures

2007 RS4 Avant
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post #16 of 45 (permalink) Old 11-30-2007, 03:57 AM Thread Starter
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Interesting Andy. I'm not seeking to argue with you, as your experience is clearly your experience, but let me share my experience.

I've got a '06 B7 RS4, and starting out to replace the side and DRL bulbs as an experienced electrical/electronic guy, i indeed 'calculated' the resistor value to replicate current draw of the existing bulbs. And by that logic the DRL bypass resistor is indeed in the 6-10 ohm range. However, the heat dissipation is huge. I didn't want to mount the resistors externally with all the hassle that generates. I wanted low enough dissipation that i could mount the 2 resistors INSIDE the removable 'cap' on the headlight assembly.

So, i ran a series of tests and eventually concluded on 24 ohm (50W) for the DRL and 68 ohm (25W) for the side. I have 100% tested and have no bulb failure indications per your tiresmoke article under any set of conditions. (On or off or DRL on the xenons coming on automatically etc etc). Also it's not breached the sealing on the cap, doesn't run hot and is seriously neat. Pix on request.
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post #17 of 45 (permalink) Old 11-30-2007, 07:35 AM
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Do post a pix ...

I am surprised 24ohm works as 25ohm did not for me on startup ..

My resistors seem find(yes they get hot) sitting in the engine bay and I have used double sided foam tape to secure them.

Where did you get the 24ohm resistor, web link ?

2007 RS4 Avant
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post #18 of 45 (permalink) Old 12-01-2007, 02:27 PM Thread Starter
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OK, will do a pic in daylight tmrw. Got the resistors from RS components. RS Components - The UK's leading industrial supplier to business, Free delivery, Free technical information
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post #19 of 45 (permalink) Old 12-07-2007, 07:14 AM Thread Starter
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Pics of LED install in headlight cap

Andy, here's the pix.

Wires are soldered to connectors on bulbs as opposed to Scotchlok - neater.
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post #20 of 45 (permalink) Old 12-07-2007, 02:06 PM
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Hello guy's,
where can I get the "DRL LED"?
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