Stereo & Electronics - 200A or 235A HO ALTERNATOR ?

my car idles at 800rpm

i did a little search heres what i found:



That's interesting...their 200 amp alternator puts out more current at idle than their 235 amp. I just put the 200A Alterstart alternator in my car today. It puts out 58.9A at 1600, 89.1A at 1800, and 114.5A at 2000 (alternator speed, divide by 3 for engine RPM). That's twice the output at 600RPM engine idle speed.

old thread i know, do u still have the birthsheet of ur 200A alt ?


{EDIT} here is the sheet. damn scanners!!
http://i145.photobucket.com/albums/r201/mackzero/altsheet.jpg



AGAIN my car idles @800rpm

Here's the data from my 200 amp Alterstart:

1600 -- 38.4
1800 -- 67.6
2000 -- 93.2
2500 -- 139.9
3000 -- 166.7
4000 -- 190.3
5000 -- 200.8
6000 -- 206.7
7000 -- 210.7
8000 -- 213.5

Turn on speed -- 1347 RPM

All RPM values are at the alternator...I run a stock sized ATI Super Damper, but I don't remember the measured alternator pulley diameter (it was close to stock though), so I don't know what the exact pulley ratio is for mine.

2002 Camaro SS - Built using advice from the internet. Runs 14s.

Well done...

There's a big difference when you're talking automatic (idle at 500rpm) versus manual (idle at 800rpm). In an automatic the alternator can't even keep up with A/C, lights, and signals when sitting at idle so getting the most output at around 1500rpm (alternator speed) is important. With the higher idle of a manual transmission car, the difference isn't as important because the alternator puts out much more current at 2400rpm (alternator speed).

I have the sheet somewhere but I'd have to do some digging to find it. The numbers in the earlier thread were taken from that sheet.

There's a big difference when you're talking automatic (idle at 500rpm) versus manual (idle at 800rpm). In an automatic the alternator can't even keep up with A/C, lights, and signals when sitting at idle so getting the most output at around 1500rpm (alternator speed) is important. With the higher idle of a manual transmission car, the difference isn't as important because the alternator puts out much more current at 2400rpm (alternator speed).

I have the sheet somewhere but I'd have to do some digging to find it. The numbers in the earlier thread were taken from that sheet.

ahaaa gotcha,


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any recomendation ?

EDIT: is there any problems with both amps coz i read somwhere that 8 out of 10 works well.

forgot to say that i have the SLP 25% UD-Pulley.

received the alt

http://i47.tinypic.com/bf2l8l.jpg

along with few goodies.

http://i46.tinypic.com/2n9gbjl.jpg

http://i46.tinypic.com/1zn0q5d.jpg

yap 1000ft for $65 not bad :D

You've (Engine HP) done the Big 3, correct?

You can get an alternator overdrive pulley if you need more idle power. But don't do that if you have a high RPM engine. We don't want to spin these things at a billion RPM.

You've (Engine HP) done the Big 3, correct?

http://www.ls1tech.com/forums/stereo-electronics/1037030-if-you-havent-seen-monsoon-amplifier-pics-now-ur-chance-my-upgrades-d-6.html

You can get an alternator overdrive pulley if you need more idle power. But don't do that if you have a high RPM engine. We don't want to spin these things at a billion RPM.

not thinking about that now, maby later :corn:

So you're good to go!
IMO, if your amperage isn't high enough at idle because of the UD pulley it wouldn't hurt to bump the idle up 900rpm.
I ran mine at 850rpm with the same pulley and a Powermaster 200amp. alt., but I think I'm might be pushing more power then you are.