How to aim USA delivered 993 headlights after applying aftermarket HID or LED bulbs or updated projector Lenses.

Disclaimer: The content of this page, relates specifically to the Porsche 993 (911 1995 to1998) The author here is not a professional automotive technician and the procedure described on this page may not be the best to use in all situations.  Many times a lot can be learned by simply watching qualified professionals work on your 993's headlamps. Though we strive to provide completely accurate and appropriate information on the given subject in this document, some of the information you find on this page may be in error, also opinions expressed on this page are just that, opinions, therefore, please feel free to use the information on this page at your own risk.

Please read this entire document before using its content to aim your 993's headlights. 

The factory procedure to aim 993 Headlights may not be suitable for a number of reasons once aftermarket upgrades to the headlamp pods or changes to the ride height or stance of a 993 are made. For this reason here is my first draft of how to do a DIY headlamp adjustment once these changes have been done. The below includes information and illustrations garnered from professional sources, US DOT documents, as well as sections of the Porsche factory documents covering this subject and my personal experience.

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Supplies & The Tool needed:

• A measuring tape
• A dry-erase marker
• A roll of 1/2" or 1/4" wide masking tape
• A wall or flat surface with  about a 40-foot distance of level pavement in front of it
• A piece of cardboard to block off a headlight
• A 5mm ball socket Allen Hex Key driver with a thin long shaft

Steps to aim your headlights:

1. Prepare your vehicle: Make sure your tires are filled to the appropriate air pressure and that you have around a half tank of gas as average ballast weight.
2. Making a Headlight Axis Mark: With a dry-erase marker, draw a small dot in the center of each low-beam headlight beam where they pass through the headlight face glass. This is the Headlight Axis Mark. 
3. Park your vehicle: Park your vehicle right in front of a vertical flat surface — this could be your garage wall, garage door, or a wall in a parking lot. You should have enough room in front of the wall to back up the front of your car 25 feet in a straight level line from that spot.
4. Jounce the suspension: Bounce the vehicle a few times on all four corners to allow the suspension to settle.
5. Create a Vertical Center Guide Line: Using a piece of masking tape, put a vertical mark on the wall or garage door in line with the center of your vehicle. Don’t worry about precise measurements — this mark will just serve as a guide. The hood badge is a good reference for the center.
6. Create the Vertical Headlight Axis Line on the wall: Place a vertical strip of masking tape on the wall in front of each headlight's projected low beam. The Headlight Axis Mark placed on the lens in step 2 should line up with the center of the vertical tape.
7. Measure the height of the Horizontal Headlight Axis Line: Using your measuring tape, measure from the ground to the headlight Access Mark on the headlamp lens from step 2.
8. Mark the height of the Horizontal Headlight Axis Line on the wall: For each headlamp measure up the wall and make a mark on the tape at the height of the measured Headlight Axis Mark.
9. Placing the driver's side Horizontal Headlight Cutoff lines: On the driver’s side of the wall, measure four inches below the axis height you marked and draw another line on the Vertical Headlight Axis tape line from step 6. 
10. Placing the passenger's side Horizontal Headlight Cutoff lines: On the passenger’s side, draw a line two inches below the axis height. These marks will serve as vertical cutoff points when you aim your headlights. The driver side mark is lower than the passenger side mark to reduce the glare seen by oncoming drivers. 
11. Mark the Horizontal Headlight Cutoff Lines: For each headlight, place a horizontal strip of masking tape above each cutoff mark from steps 9 & 10, making sure they are level. The bottom of the tape should line up with the measured cutoff line. 
12. Back your vehicle up: Back your vehicle in a straight line away from the wall. The front of your headlights should be 25 feet from the aiming wall chart you’ve created with masking tape.
13. Adjust your headlights: 
1. When adjusting each headlight individually block the illumination from the other headlight.
   
2. Then, as shown in the diagram below, use the ball head Allen hex key to turn the headlight pods adjuster screws.

3. 

   Illumination Position Relative to the HCL & the VHAL 

    Turn the adjusters in combination to position the top of the low beam light lines to line up with the bottom edge of your Horizontal Headlight Cutoff  Line (HCL) created in step 11. as shown in the illustration to the right while centering the illumination of the headlamp position over the Vertical Headlight Axis Line (VHAL) created in step 6.

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13.  Check the alignment: Remove the cardboard or jacket from the covered headlight and check the finished alignment. The beam from the driver’s side headlight should sit a bit lower than the one from the passenger’s side. This setup gives you proper visibility without blinding other drivers. The beams should also be aproximatly equal distant from the Vertical Center Guide Line created in step 5.

14.  Test your lights: After you’ve set your headlight alignment, take your vehicle out for a test drive to make sure the lights provide proper visibility. Xenon Aftermarket High-Intensity Discharge (HID) low beam lamps are considerably brighter than the DOT approved Halogen bulbs that came as original equipment on your car.  Aftermarket modificaions also may have a considerably different illumination fall-off  patern at edges of their projected beam so it may be found to be neccessary to readjust the headlights slightly lower than the DOT specification to avoid blinding oposing traffic. The goal is to not blind opposing vehicles' drivers. An indication of  the need to lower the beam height a little is if you find opposing traffic is flashing their high beams at you during night driving with just your low beams on.

Correctly aimed headlights allow you to drive safely without compromising the safety of drivers in opposing traffic. 

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