16psibrick Posted April 3, 2006 Share Posted April 3, 2006 peaked under hte cover and saw some codes including soething that reads like 55amps??!? can that be right? b Link to comment Share on other sites More sharing options...
snoman Posted April 4, 2006 Share Posted April 4, 2006 I know the 3rd generation Legacy had a 100+ amp alternator. I doubt the newer models have a lower rating. Link to comment Share on other sites More sharing options...
rao Posted April 4, 2006 Share Posted April 4, 2006 It is 110 amps. Rob IF YOU CARE ABOUT YOUR CAR YOU SHOULD NEVER DRIVE IT Link to comment Share on other sites More sharing options...
16psibrick Posted April 4, 2006 Author Share Posted April 4, 2006 great! thanks! b Link to comment Share on other sites More sharing options...
mevanvt Posted April 13, 2006 Share Posted April 13, 2006 How many watts rms can the stock alternator support without overstressing it and shortening its life? Also how many watts can it support without constant headlight dimming? I'm guessing they will just dim at high volume and if i keep the volume down to a lower level like i usually do dimming won't even be an issue even running 800-900 watts like i plan on doing. Link to comment Share on other sites More sharing options...
meier motor sports Posted April 13, 2006 Share Posted April 13, 2006 ohms law http://www.the12volt.com/ohm/ohmslaw.asp Link to comment Share on other sites More sharing options...
mevanvt Posted April 13, 2006 Share Posted April 13, 2006 ohms law http://www.the12volt.com/ohm/ohmslaw.asp I understand ohms law. I'm asking how bad is it for the alternator to be pulling a lot of current. The amps i'm looking at would be pulling 130 or so peak amps. I was asking how many watts people have run on their stock LGT alternators and not had any problems. Link to comment Share on other sites More sharing options...
Boulderguy Posted April 14, 2006 Share Posted April 14, 2006 8-900w seems to be working fine for many folks. Link to comment Share on other sites More sharing options...
mevanvt Posted April 14, 2006 Share Posted April 14, 2006 Sounds good. That is about what it looks like i'll have when I get the money for a system. 8-900w seems to be working fine for many folks. Link to comment Share on other sites More sharing options...
rony Posted April 14, 2006 Share Posted April 14, 2006 As long as you back up the alternator with a good battery, you can get away with a lot. Unless you are making an SPL car, then don't screw around and get a another or bigger alternator. My Car vBGarage Link to comment Share on other sites More sharing options...
CDN 2.5i Posted July 30, 2007 Share Posted July 30, 2007 It is 110 amps. My limited research suggests only 70 amps... for my '05 2.5i. I'd like to find out definitively because I need to upgrade either my battery (stock sucks particularly in colder weather and I will be subjecting it to a much colder climate this winter) or my alternator to help address the dimming I get when playing the stereo loud... I was referred to this place: http://www.maniacelectricmotors.com/20allal11.html and was just going to go with the 110 they sell as I thought it would be a nice upgrade over my 70 amp unit. Link to comment Share on other sites More sharing options...
CSTMIZR Posted July 30, 2007 Share Posted July 30, 2007 I would be impressed if the factory Leggy alternators broke the century mark, most makes come in between 60-90 amps. High-current alternators make a world of difference, well beyond anything that a cap or new battery can hope to achieve. A battery is like a resevoir, a cap is like a reserve pipe, and a high-amp alternator is like a tropical down-pour. The first is mass storage, the second is for instantaneous draw, and the third is a replenishing source. Without the rain the resevoir and reserve can't provide proper service. These guys have been in the business of SPL competition for a while now, check'em out. http://www.ohiogen.com/ Link to comment Share on other sites More sharing options...
CDN 2.5i Posted July 31, 2007 Share Posted July 31, 2007 Yah, my understanding was stock was 70, some STI (Imprezas) came with 90 amp units. The stock battery is quite weak imho and I feel I should definitely upgrade it to a deep cycle unit as I would like to listen to my stereo, watch a movie while parked etc and not have an issue plus the cold weather performance is definitely lacking. On top of that, I definitely get dimming when the stereo is going hard so that points to the charging circuit = alternator. (I've already done the 'grounding'/big 3 upgrade). Link to comment Share on other sites More sharing options...
PGT Posted July 31, 2007 Share Posted July 31, 2007 an Optima battery is a welcome upgrade if you are having issues. Link to comment Share on other sites More sharing options...
CDN 2.5i Posted July 31, 2007 Share Posted July 31, 2007 an Optima battery is a welcome upgrade if you are having issues. yah, thinking Yellow Top... going to shop around a bit for a good price. What is the right model/size? Also, there has been mention of Optima recalling batteries etc - a bad batch or what not perhaps. Just want to ensure I'm not getting old stock from a disreputable dealer etc... Link to comment Share on other sites More sharing options...
jvento Posted July 31, 2007 Share Posted July 31, 2007 Yea cstmizr hit it right on the head more like 60amps I have an ohio genertor 160amps yea. I have an optima battery I think I am going to switch to street wire battery. Link to comment Share on other sites More sharing options...
EJ252NA Posted September 30, 2008 Share Posted September 30, 2008 Bringing this topic back to life...According to the owners manual, the rating of the alt is 12V-110A. From where did the 70A info came from? Link to comment Share on other sites More sharing options...
CzarDestructo Posted October 1, 2008 Share Posted October 1, 2008 Just keep in mind folks 110A when the car is running at an RPM sufficiently high enough to spin it up fast enough. If you're at a light blasting your tunes and wondering why your lights are dimming you might want to consider turning it down to avoid damage (and to be polite ). Link to comment Share on other sites More sharing options...
EJ252NA Posted October 1, 2008 Share Posted October 1, 2008 Just keep in mind folks 110A when the car is running at an RPM sufficiently high enough to spin it up fast enough. If you're at a light blasting your tunes and wondering why your lights are dimming you might want to consider turning it down to avoid damage (and to be polite ). By chance do you know at what rpm will the alt be running at 110A? Link to comment Share on other sites More sharing options...
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