Herman K

Roger sells a kit that will knock your s...s off ask him how I now?

H4 80 Watts low and 100 Watts high beam with dual elumination at high beam it's like your ready to land on a Carrier.

Ducman82

what type of bulb?

Herman K

H83140171 Hella Halogen High/Low Beam Off Road Bulb H4 12V 100/80W

PC-85-928S

is an 85 US, a sealed 7" bulb?
What is the best/brightest bulb for this application?

Alan

Its a sealed beam - there is no seperate bulb - you just replace the whole thing.

Best cheap-ish replacement is real Bosch/Hella/Cibie 7" H4 lenses with your choice of H4 bulbs. Brighter sealed beam units are hard to come by and are just bad - due to the crappy pattern - not worth changing.

Ignore all the plastic junk on eBay that claims to be H4 - just garbage.

So:

For sealed beam stick with stock wattage because if you don't you are just screwing everyone else
for 7" H4 you can go up to 100/80W with some good benefit on stock wiring, local relays are much brighter
for 8" H5 stick with stock wattage because if you don't you are just screwing everyone else
for 8" H4 you can go up to 100/80W with some good benefit on stock wiring, local relays are much brighter

In all cases make sure you are aimed correctly. Both types of H4 are good - bigger is better. 8" H5's are much better than 7" sealed beams - but still worse than 7" H4's.

Alan

AirtekHVAC

Anyone looked at the Trucklite LED option....I saw some at a rod shop, and they were amazing...about 500$ a pair...

Opelotus

I purchased and installed a set of these Bosch 7" H4 lenses awhile back (http://www.busdepot.com/0301600118), I think someone else may have posted about them in another thread last year. They are good quality glass lenses and are soooo much better than the stock 7" sealed beams, have the nice cut-off that rises to the right as the other H4s do. Using Sylvania standard wattage bulbs at the moment, brightness and distance are much improved. Only issue I had was a bit of "haze" that had to be wiped off from the inside of the glass... been to lazy to clean them completely yet.

Also worth noting that these lenses are flatter than the sealed beams and do not have the "nubs" on the surface, and they are labeled motorcycle in small print in the glass. Not sure about DOT legality but I'm not bothered. Are the Euro H4 lenses technically not legal in the US today?

Alan

No technically not legal - but the reasons are stupid. The Euro lenses are better for your vision and better for everyone else (lower glare).

The DOT regulations on this are just plain stupid - all the rest of the world gets it - but not the US...

These days euro pattern lenses are OK - but I don't think its retroactive. But who cares!

Alan

Bjbpe

Alan:
For illiterate aerospace engineers and such, could you describe in a little detail what I should purchase (and maybe from whom) to get the excellent DOT-go-to-hell lights. Thanks.

jheis

The LHD (USA) 8" H4 headlights are 928 931 101 03.

They're not cheap, but they're worth every penny.

Bought a set for my '82 years ago cheap from Zims. Recently bought a set from Roger for my '89 - about twice as much - but sold the original H5's on ebay and recouped about half the cost. YMMV.

James

Went back and looked at my receipts. I recouped about a third of the cost - as I said, the H4's are not cheap!

jcorenman

Brad, a temporary fix: the upward "spray" of light that is supposed to go to the right (to light up the deer hiding in the bushes) is created by a "wedge" in the glass pattern on the opposite side-- normally on the right side facing the headlight, yours would be on the left side of the glass.

Cover that "wedge" with black tape. That will eliminate the "upward spray", and you should have just the straight/sharp cutoff shown in Alan's drawing. Then adjust the lights so that the cutoff is dipped slightly.

There was a recent thread about this, it is a common problem for UK cars visiting the continent.

[Edit] Found it: https://rennlist.com/forums/928-forum/597116-h4-headlights-from-rhd-car-into-lhd.html
(See post #12)

Alan

Jim that should only be a temporary fix - Brad - you just need LHD lenses - there in no permanent adaptation that makes any sense here. You are losing part of the advantage of the H4's.

Bjbpe - for the very best get Bosch H4 8" lenses (LHD) with 80/100W bulbs and local relays (sounds like Roger has a kit).

This is expensive - probably $700 or so and some effort to implement the relays. But is the best incandescent lighting you can get - and (more than) adequate for all USA conditions .

It is actually better than HID systems adapted to a 928 - due to non-optimal optics for that.

Alan

danglerb

Might of been me posting, these were about $65 US shipped with bulbs, and marked DOT motorcycle, iffy on legal, unlikely an issue I think even in a roadside inspection.

jcorenman

Agreed-- it was suggested as a temporary fix only. But in the "food chain" of lighting quality, it is still a better option IMO than what Brad is doing-- aiming wrong-way H4's very low to avoid glare-- or sealed-beams for that matter.

This needs to be engraved on a plaque and posted on the wall somewhere:
We've got 100/80 H4's with relays (and adjusters) in the GT, 100/80 H4's with stock wiring in the S4, and stock lighting in the GTS. The difference is literally night and day.

(I tried Hella 130/90 bulbs in the GT-- with relays-- but one of them melted. It may have simply been defective bulb because the other one was fine, but those bulbs also have a pretty short rated life-- only around 50 hours as I recall).

FiveElements

I run a basic HID 35watt kit with my lights aimed mid to low and its perfect.