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Old 07-01-2008, 09:48 PM   #1
thunder_lizard_1976
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Question 07 WRX DRL delete = dim low beams?

The title pretty much says it all..Ever since I disabled the DRL's on my 07, the low beam main headlights don't seem quite as bright..They never really worked that well to begin with, but this is pathetic. Has anyone else noticed this, or am I possibly seeing things?
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Old 07-01-2008, 11:52 PM   #2
lennyTR
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Quote:
Originally Posted by thunder_lizard_1976 View Post
The title pretty much says it all..Ever since I disabled the DRL's on my 07, the low beam main headlights don't seem quite as bright..They never really worked that well to begin with, but this is pathetic. Has anyone else noticed this, or am I possibly seeing things?
Nope. Mine work fine.
I disabled the DRL's a few weeks after buying my car. I disconnected the ground...it's in a big plug that sits under the passenger corner of the dash. The thread is on here somewhere.
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Old 07-02-2008, 08:42 AM   #3
yakkosmurf
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Why are there so many threads about disabling DRLs? I'd prefer others to see me and avoid hitting me.
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Old 07-03-2008, 10:44 PM   #4
thunder_lizard_1976
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I mainly disabled them cause even on a low volt setting, the DRL's suck up some juice, and I personally like to be able to run just the parking lights in their place..I used the un-grounding method as well (red/ yellow center wire behind passenger dash) I wanted to know if others with the same mod had noticed an difference themselves....
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Old 07-04-2008, 07:31 PM   #5
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Quote:
Originally Posted by thunder_lizard_1976 View Post
...the DRL's suck up some juice...
You do realize your car has an alternator to generate electricity when it runs? The alternator spins the same speed with the same spinning friction no matter what loads its supporting. How does a 5% (at most) increase in draw make any bit of difference? What do you need the extra margin for?
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Old 07-05-2008, 12:15 AM   #6
lennyTR
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Originally Posted by yakkosmurf View Post
Why are there so many threads about disabling DRLs? I'd prefer others to see me and avoid hitting me.
If you have an HID system (like me), you wouldn't want your HID's to be turned on with half power. That is the reason why I disabled mine. And besides that, for some reason I just have never like DRL's on any car...

They just don't agree with me.
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Old 07-05-2008, 12:15 AM   #7
lennyTR
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Quote:
Originally Posted by yakkosmurf View Post
Why are there so many threads about disabling DRLs? I'd prefer others to see me and avoid hitting me.
If you have an HID system (like me), you wouldn't want your HID's to be turned on with half power. That is the reason why I disabled mine. And besides that, for some reason I just have never liked DRL's on any car...

They just don't agree with me.
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Old 07-05-2008, 02:57 AM   #8
matt.britt
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Quote:
Originally Posted by yakkosmurf View Post
The alternator spins the same speed with the same spinning friction no matter what loads its supporting.
This is not true. However, I agree that the load incurred by headlamps isn't really noticeable, though I doubt this is the reason someone would want to disable their DRLs.
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Old 07-05-2008, 08:19 AM   #9
Big-E
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Ok, no flaming.

Even if the draw with the DRL's on is negligible, there's still a draw. A draw means more of a load imposed and to compensate, the idle must go up and with that, more fuel consumption.

To possibly solve your "dim" low beam problem, you may want to consider making/buying a head light wiring harness that is separate from the factory one.

In short, the low beam bulbs operate below their full potential due to the fact the power to feed the bulbs takes a long path through the harness and that the wires themselves are thin, say 18-gauge.

If you have a harness that's both shorter in length and a thicker gauge, you effectively reduce loss and resistance and thus more power gets to the bulbs so they are now working closer to their rated output.

Look at and first read this write-up by Daniel Stern Lighting: http://www.danielsternlighting.com/t...ys/relays.html

Look at Lightwerkz (if you want to purchase a harness -- scroll down to about the bottom of the page): http://lightwerkz.net/prod_subaru.htm

Look here at Nasioc (if you want to build your own harness) -- there are several write-ups. Also maybe ScoobyMods; IWSTI; etc.

I made my own low beam harness out of 12-gauge wire for both the power and ground circuits. The low beams are brighter and so are the high beams. Why, when I did not do anything to the high beams? This is because the low and high beams share the same power feed. Since the low beam now has its own power source, the high beams no longer share and thus have their own dedicated power source, thus more flows to the bulbs and thus, they are brighter.

Why not upgrade the high beam wires with their own dedicated harness? IMO, it's not worth it -- I don't drive around with the high beams on so why put the effort and resources where they're not needed.

Good luck and Happy Motoring!
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Old 07-05-2008, 12:32 PM   #10
matt.britt
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Quote:
Originally Posted by Big-E View Post
Even if the draw with the DRL's on is negligible, there's still a draw. A draw means more of a load imposed and to compensate, the idle must go up and with that, more fuel consumption.
Quite right, but with alternator efficiency factored in (~55-60%), your low beams dissipate no more than about 0.13 horsepower per bulb. If you can notice a ~0.3 HP difference, hats off to you!
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Old 07-05-2008, 02:31 PM   #11
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DRL's are not really that effective anyways.

http://www.motorists.org/drl/

They are a great gimmick though and I can't say that I miss them since I disabled them either.
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Old 07-30-2008, 04:00 AM   #12
bonesmcgraw
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Quote:
Originally Posted by lennyTR View Post
If you have an HID system (like me), you wouldn't want your HID's to be turned on with half power. That is the reason why I disabled mine. And besides that, for some reason I just have never like DRL's on any car...

They just don't agree with me.
Did you remove the wire in the relay to the left of the blue relay behind the glove box. I believe it is yellow with a red stripe or is there a different wire to disconnect. The reason I ask is I just upgraded to a tsx hid retrofit and I disconnected that wire and my drls went off with my halogens. After my retrofit the hid's are now on and I can't figure out how to disable the drl's now.
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Old 08-12-2008, 02:54 PM   #13
rexyrex
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07 WRX DRL delete = dim low beams?

Last edited by rexyrex; 10-08-2008 at 06:33 AM.
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