DR

Correct, we modified all of our kits with a large waterproof diode for this purpose. They are the large yellow inline looking fuse holders seen in the Install Guide in the link I posted earlier (also added pics below).

In this example, with HIDs in the Driving lights they then become the real "high beams" and you can see forever!!!

danglerb

This thread needs pictures

Lizard928

I have done this a few times, and I always use the kits which take a bigger power source and use a relay. I then take the power source off of the ABS power post.

DR

OK, here's a comparison, one side with HID, one side stock...

ew928

The HID H3 conversion in the S4 fogs work real nice, Dr. Bob.

If you wire a true ground to the ground supply of the fog relay, I think, you can defeat the fog lights turning off with the S4 high beams. Porsche uses a switched ground to defeat the fog light relay when high beam is triggered.

Leon Speed

Over here Xenon lights are only allowed if the car is equipped with a headlight washer system (no problem) and an automatic headlight adjuster system (problem). The latter has to be retrofitted. Hella makes an universal system for that.

SeanR

I will be going to H4's as soon as I can find an affordable set.

Here are some pics of this kit. I took pics of the 2nd kit, which is missing a ballast since the first kit had a bad one in it.

If/when I get the car out after dark I'll take a picture from the drivers seat.

SeanR

Dang, looking at that picture, they look green. In person they are a brilliant white.

Bill Ball

When I put the HIDs inplace of the halogen H4s, the beam pattern was not as precise. The light source geometry is different and it changes the excellent focus that the halogen H4s have. I ended up aiming them slightly lower than the halogens and I have not had any complaints/light flashes whatsoever from oncoming drivers. So, I think HID conversion on H4s is acceptable.

Alan

Bill - You can do this safely - no issues.

Alan

Alan

I could not agree more... Don't do this with H5's!!!

I'm sorry to be a bit blunt - but you are fooling yourself if you think this is a good thing... THINK!

H5's are pretty crappy lenses with halogen bulbs - with about 4x-5x the light output for HID's the amount of stray spill going basically everywhere is nasty anyway - plus the orientation, size & shape of the HID arc is different to the halogen flament so the optics are even more challenged.

So you have this great amount of illumination all over the road - fantastic. The poor soul who is driving the other way - probably at high speed - more or less directly at you - is now blinded from the glare.... and this this is a good thing for you...?

Any of us could be the other poor soul - DONT DO IT! for your sake and everyone elses..

Get H4's they at least control the upward still pretty effectively - you won't regret it.

Alan

Alan

I have 6000K HID's in place of the fog H3's. Without some slight modifications I don't think this is sufficiently controlled either.

However if you experiment you can blank off part of the reflector to stop excessive up-spill. Turns out you only need an approx 3/8" - 1/2" max strip (not quite on a straight line) to solve the issue.

I spent a lot of trial & error time on the first one - but the second one (mirror image) was super fast... I used just regular high density matt/flat vinyl film. The HID's don't get so hot that this is a major issue and its lasted very well (3+ yrs already)

The light output is very good for fog/DRL use - very wide/very low but it doesn't throw that far due to the optics patterns and the low mounting that makes long throw & safe aim basically mutually exclusive.

Alan

SeanR

Just had a bit of a night drive and will have to agree about the H-5's. Damn, low beams light up everything around, including on coming traffic. Didn't get flashed but I could tell that they were way to0 bright. The high beams didn't do much more except light the trees above me.

H-4's will be on order, can't wait because I'm not going to take the lights out.

DR

When I did this(jimpering High and Low beam wires) it make the High Beam indicator stay on all the time, AND IIRC coffectly on either the 85 Euro or 90GT the driving lights stayed on even when on low beam.

It is best to use a blocking diode when jumpering the "Low Beam only" HID to stay on for both Low and High beam mode.

Franks928s

THank you all for your comments! 1 related question - one not
1. where is the best location to mount the ballasts for the H4? Power tap-in?

2. What would you suggest I use ti increase the fog lights illumination (85-928s here)? Will changes to these afffect the "light brain?"

Frank