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Thread: LED Fog Lights & Intercooler Ventilation

  1. #1
    Join Date
    Feb 2008
    Location
    ACT
    Posts
    566

    LED Fog Lights & Intercooler Ventilation

    After taking a look at the design of the front fog lights & grilles a little while back I decided that the grille on the driver's side of the Polo GTI is really stupid. The flow of air to the intercooler is blocked by plastic coverings, with the air sucked in from the centre of the car and then redirected behind the (hot) fog lamp onto the intercooler. I can't explain why this is the case, but for a car that will be driven hard on more hot days than foggy days, I decided to tweak the grill slightly.

    The first step was obviously to remove the obstructions, which meant the plastic between the grille bars was removed, the rear 'deflector' taken off and the fog light taken out. This gave a nice clean flow of air to the intercooler, but fog lights do come in handy (especially in Canberra winters) so I needed to come up with a replacement.

    This evening I finally finished the first draft version of those new grilles:







    I'm sure we'll get another foggy morning here in the next week so I can try them out in the real world, but from my testing in the garage they seem to have a similar light throw to the standard lamps - perhaps slightly weaker but on the plus side a nice blueish light.

    I bought new grilles and used the connector from OEM fog lamps to wire up the LEDs, so the new grilles can be swapped back to the originals in about 2 minutes.

    The new design is really only required on the driver's side where the intercooler is mounted, but obviously for symmetry I did the same to both sides.

    Although this was a function over form project, I'm pretty happy with how they turned out for a first draft.

  2. #2
    Join Date
    Mar 2007
    Location
    Brisbane
    Posts
    2,864
    That looks pretty cool, James.

    Dave

  3. #3
    Join Date
    Jun 2008
    Location
    Sydney
    Posts
    450
    that's awesome!

    would be really nice if you can integrate them inside the headlights.

    this is what I did to my car. retrofitted the headlights and added 2 led strips.

  4. #4
    Join Date
    Jan 2008
    Location
    Sydney
    Posts
    523
    Do you think it made much difference?

    I have been monitoring the intake temp for the past few days using a ScanGaugeII which uses factory sensor located after the intercooler (I been told its on the intercooler, correct me if im wrong).

    The intake temperature on the car is only about 5 to 6 deg hotter than the temp outside (according to car display temp). I should point out that this is while you are moving at reasonable speed (60kms/h+) and have not been stationary in traffic for a long period of time.

    If you are in slow moving traffic or stationary for a long period of time then expect the temp to be 50 deg+.

    Note: these observations were made in past few days (Winter) at night in Sydney.

  5. #5
    Join Date
    Feb 2008
    Location
    ACT
    Posts
    566
    Thread Starter
    Quote Originally Posted by Bubu View Post
    Do you think it made much difference?

    I have been monitoring the intake temp for the past few days using a ScanGaugeII which uses factory sensor located after the intercooler (I been told its on the intercooler, correct me if im wrong).
    I'm not sure - Canberra in the middle of winter is not the best time to test a new cooling solution.

    When the weather warms up I'll connect up the VChecker and take a look at the intake temps after some hard driving and compare between the new setup and the stock grille & fog light.

    leasaunce - those headlights look great - did you install the LEDs as day time driving lights (as per the new Audis)?

  6. #6
    Join Date
    Jun 2008
    Location
    Sydney
    Posts
    450
    Quote Originally Posted by jamesatfish View Post
    leasaunce - those headlights look great - did you install the LEDs as day time driving lights (as per the new Audis)?
    nah, just for parker lights. (plus didnt know how to connect as a DRL).

    where did you get your LED from??

  7. #7
    Join Date
    Feb 2008
    Location
    ACT
    Posts
    566
    Thread Starter
    Quote Originally Posted by leasaunce View Post
    nah, just for parker lights. (plus didnt know how to connect as a DRL).

    where did you get your LED from??
    The LED came from http://www.superbrightleds.com/specs/WFLB.htm - the ones I got were 'cool white' which came to about $11 US per strip.

  8. #8
    Join Date
    Nov 2006
    Location
    Melbourne
    Posts
    196
    DId GTI come in YELLOW?????
    nice led, saw em on ebay...

  9. #9
    Join Date
    Jan 2008
    Location
    Sydney
    Posts
    523
    Quote Originally Posted by GTIJNR View Post
    DId GTI come in YELLOW?????
    nice led, saw em on ebay...
    No, it didnt come in yellow, the car was wrapped in a yellow vinyl sticker. If you do a search you will find more info on the topic.

  10. #10
    Join Date
    Apr 2008
    Location
    Melbourne
    Posts
    73
    Users Country Flag

    Did you have to remove the grills to install?

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