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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Thu, May-15-2003, 09:59:35 PM   #1
MEATBAG
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Default Alternator output

I remembering seeing some where that the alternators output was 120amps but i just saw a tech sheet on the 2002 M3 on a site and it said it was only 70. It wasnt an official site or anything but does anyone else know what it is?
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Old Thu, Feb-24-2011, 02:06:05 PM   #2
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Default Re: Alternator output

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I remembering seeing some where that the alternators output was 120amps but i just saw a tech sheet on the 2002 M3 on a site and it said it was only 70. It wasnt an official site or anything but does anyone else know what it is?
Bump from the dead... but I am going to make a trunk mounted A/C system and need to know the alternator output so I can plan my power strategy.
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Old Thu, Feb-24-2011, 03:56:50 PM   #3
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Default Re: Alternator output

The Valeo is advertised as 120A, the Bosch as 140A, but they are the same item, so I'd say count on 120A...
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Old Thu, Feb-24-2011, 04:36:51 PM   #4
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Default Re: Alternator output

The valeo is 120A, I recently replaced it with a Bosch 150A and it was noticeably larger. So much so that I had to have some material machined off so it didn't hit my supercharger bracket.
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Old Thu, Feb-24-2011, 04:40:13 PM   #5
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Default Re: Alternator output

Do verts and coupes have the same output on the E46? I believe on the E36 vert, it's a bit higher than the coupe.
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Old Thu, Feb-24-2011, 04:48:20 PM   #6
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Default Re: Alternator output

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Do verts and coupes have the same output on the E46? I believe on the E36 vert, it's a bit higher than the coupe.
Go to REALOEM.COM and check the PN's..
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Old Thu, Feb-24-2011, 05:12:20 PM   #7
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Default Re: Alternator output

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Go to REALOEM.COM and check the PN's..
ah, got it
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Old Thu, Feb-24-2011, 05:19:36 PM   #8
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Default Re: Alternator output

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The Valeo is advertised as 120A, the Bosch as 140A, but they are the same item, so I'd say count on 120A...
But at what rpm? Of the alternator shaft, not engine. Is there an output curve somewhere?

This is an area I am not familiar with... you can change the output amperage with pulley size so there must be some kind of output curve. Knowing that with the upper limit, will help size the pulley for a specific use range.
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Old Thu, Feb-24-2011, 05:49:44 PM   #9
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Default Re: Alternator output

When you say "A/C system" are you talking about air conditioning, or alternating current? lol

I don't recall the alternator having a graph, but I'll check the paperwork that came with it, I might have missed it.

From what I read usually alternators make max power at 6000 rpm and fail at around 16000 rpm. You need to calculate the difference of the pulley sizes to compare to engine speed.
For some reason I'm not too convinced on overdriving the alternator. If you redline the engine with a smaller pulley, wouldn't the voltage regulator freak?
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Old Thu, Feb-24-2011, 06:27:13 PM   #10
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Default Re: Alternator output

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When you say "A/C system" are you talking about air conditioning, or alternating current? lol
To answer the question, yes A/C as in air conditioning. Why would I do that?

1) A/C is weight on the wrong end, better shifted to the rear in use and nice to eliminate altogether when not needed (like if it was a self contained unit only requiring power and venting hook-up))
2) The Condenser blocks the radiator and even worse, is dumping hot air into it at the worst possible time (when ambient temps are already HOT!).
3) I know the compressor draw is regulated by the DME via the mag clutch so the parasitic drag aspect is somewhat moot, but having the compressor driven with variable speed electric instead of belt drive is cool (no pun intended) and I can control it instead of the DME.

Function follows form and I put my engine’s function over the A/C’s in terms of priority… but I live in the humid Southeast so I would to retain REAL* A/C if possible, and I think I have figured out a win-win.

I have found a hermetic compressor with integral variable speed 12v motor that is capable of putting out 6k BTU/hr at only 52A (629watts), that is enough to work decently and is a reasonable amperage draw (remember that is MAX). By putting it in the trunk I can have the condenser exhaust go where exhaust belongs (out the back), I can easily remove the entire A/C without breaking lines (by making it a complete integrated system) so I can shed 50lbs when I don't want or need A/C (7 months a year and at the track) and when I do have the 50lbs, it is in a better place, there is more room in the engine bay, and most importantly engine cooling is MUCH better. Yes you can have your cake and eat it too.

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Originally Posted by NikolaiD View Post
I don't recall the alternator having a graph, but I'll check the paperwork that came with it, I might have missed it.

From what I read usually alternators make max power at 6000 rpm and fail at around 16000 rpm. You need to calculate the difference of the pulley sizes to compare to engine speed.
For some reason I'm not too convinced on overdriving the alternator. If you redline the engine with a smaller pulley, wouldn't the voltage regulator freak?
Yeah you never really have a reason to know the details…. until you do. I can figure out how to make anything work, but there is some balance of pulley size, alternator capacity, and total battery capacity that will land in the sweet spot for a perfect engineering solution for a removable trunk mounted A/C system… but tough to do when you don’t know the details of the alternator’s output and I am a newb in the electrical world, though projects like this gets me motivated to learn.

* not interested in cool suits, or ice/water fan hack solutions... I need dry cold air in this humid he!!
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Discussing Alternator output in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)