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Old 11th May 2006, 17:39   #1
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Question A light question?

As you all know I have a very contrversial Petra..

Now When I thought (only thought , not very seriously though), will replace the headlights to say 100/80, following questions stuck to my mind..

Petra has a pair of H7 for Low beam and a pair of H1 for high beam,

Right now they are 55 and60W,

So, In a car which has H4, 55/60, and you flip to high beam, your power consumption is 60x2 =120W, Right..

Now if you have 90/100 H4s, then the equation is 100x2=200, a little more load to the alternator (about 17A of a typically 45?A alternator)

In case of my car, when you flip the high beam, the low beam light stay on, which means

Stock:
LB 55x2 = 110
+
HB 60x2 = 120

=230W

You are already more than the mod you can do on a H4 system.

Now If I replace the bulbs as I mentioned earlier, the equation is
Mod:
LB 80x2 = 160
+
HB 100x2 = 200

=360W

a whoopping 30A...

Is it a suggestible mod???

Your views please?
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Old 11th May 2006, 18:04   #2
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BTW, Has any one done this kind of mod on your cars, like petra/palio, Optra, corolla, etc...
Can you share your experience please.
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Old 11th May 2006, 18:52   #3
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I believe boom shiva has changed his lamps on his optra. Calling boom shiva...listening?

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Old 11th May 2006, 19:48   #4
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Rehaan, waiting for your expert opinion, please!!
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Old 12th May 2006, 11:26   #5
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as you have the option of differnt bulbs ,why not change only the low beam ...that would mean (80w-high beam +60w high beam )...so thats 140X2=280w which means ...24 A of current ...or
change only your highbeam which means (55+100),i.e 155X2=310 W which means about 26 amps ..

if both the bulbs are pf same type ...how about putting 80 w in your high beam and keeping the 55w low beam ....


the Palio weekend has 4 pairs of lights ...maybe it has a different alternator ...how about changing your alternator to the one in the weekend ..

Are you sure of your alternator ratings ?????



talking of alternators ,my friend has replaced his 1985 4WDgypsy alternator with an opel astra alternator ...as his gypsy has an electric winch ,130/100w bulbs and a very high end ICE...but he also had to change the wriring to a thicker one as the OE wires just melted when this alternator was used
it also has a custom made PS which he made himself and also a 5 speed gear box
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Old 12th May 2006, 12:21   #6
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Hmm People are talking now...

@speedsatya, Well I am not sure of alternator specs, I assumed 45A.

I think your suggestion is good, but I am unable to decide which one to change, High beam or low beam, (may be which ever is available, H1 or H7)

BTW, Weekend has 4 pair of lights???? where all
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Old 12th May 2006, 12:46   #7
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I think changing low beams would be better...but it obviously depends whether your car is driven in the city or highway. If its in city then your car would mostly spend time on the low beam, so changing that would make sense and the opposite for highway use.

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Old 12th May 2006, 13:04   #8
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Hi I'm having issues with my Optra too. I'm currently using Crystal Vision 55w H7 for my low beams and the normal stock bulbs for my high beams cause Crystal Vision H1 is only 55w and total crap.

I've finally given up my search for good white light bulbs. Going to switch to good old Philips Rallyeyes - 100 w H7 for low and 130 w H1 for high, along with a Bosch relay and thick gauge wires. Also getting foglights over the weekend.

In any case, I don't think any of us use the high beams very often, except when we're flashing or on a few patches here and there.

Btw, when I spoke to FortPoint dealers about the lamps, they told me it was alright to upgrade to 100w and 90w, and they didn't forsee a problem as long as I used a relay.

I'll let you guys know how it goes.

Edit: Ok just spoke to my trusted mechanic also. He says as long as you use a good relay, there shouldn't be an overload, and the alternator can generally handle it.

Last edited by Boom Shiva : 12th May 2006 at 13:12.
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Old 28th June 2006, 16:36   #9
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Hey DRC,

Sorry i had seen this thread a long time ago but didnt have the time to reply then.

Anyway...
Stock bulbs = 230W
Stock LB, Higher HB = 310W
Higher LB, Stock HB = 280W
Higher LB, Higher HB = 360W

I think the 280W combination would make most sense for you (assuming a majority of the driving is done in the city), it only adds 50W ~ Max 4.5A.

As long as your total load (lights+audio+fans+++) does not exceed 75% of your alternator output, its pretty safe to say that your battery will still be getting enough juice to charge it.

cya
R
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Old 28th June 2006, 22:40   #10
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Rehaan,
Thanks for the reply..
I tried the 360 W option and did not notice any voltage drop either at the battery or at the bulbs...

So sticking to it!

Thanks for the help again!
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