Is my stock alternator enough?

[ejschultz 10+ year member]

BTW, if an alternator says it puts out 110 at 1200 RPM and 220 peak, and peak is like 5000 RPM or something like that, you have to take into consideration pulley sizes. The pulley is small on an alternator so it's not the same as engine speed. Depending on the car and the alternator, your math to figure out the RPMs will be different, but in general, engine idle speed is more than 2000 RPM at the alternator.

 

[DeathByWaffle 10+ year member]

That's not funny. That's terrible for the car, amps, and speakers.

Bro. Between me and my cuz. We own 7 cars.

 

[ejschultz 10+ year member]

Bro, between my cousin and I, we own 7 cars.

Fixed.

 

[DeathByWaffle 10+ year member]

Fixed.

Ok. Haha. Sorry for the bad grammar. Didn't know school was involved on this site.

 

[ejschultz 10+ year member]

It's not, but it's a huge pet peeve of mine and a lot of others on here, too. Really, it's not that hard to use proper grammar and punctuation when posting. Not only is it easier for others to read and understand, but it makes you a better person.

 

[tpmeredith 10+ year member]

You guys wanna know whats funny. My cuz's cavalier was so bad when i had my dual l7's with my mtx thunder 6500d amp. I had to make sure I was going fast enough to make it around corners so when i got to the corner I could throw the car in "n" so i could rev the engine and keep the power ratings up haha. Or it would of killed his car if I would come to an idling stop.

Sigh...

BTW, if an alternator says it puts out 110 at 1200 RPM and 220 peak, and peak is like 5000 RPM or something like that, you have to take into consideration pulley sizes. The pulley is small on an alternator so it's not the same as engine speed. Depending on the car and the alternator, your math to figure out the RPMs will be different, but in general, engine idle speed is more than 2000 RPM at the alternator.

Ya, that's why I was saying I don't trust a lot of ebay alternators =P

 

[tpmeredith 10+ year member]

double post

 

[Chriszle 10+ year member]

The alternator would be upgraded by 110 amps.

I was referring to the post above mine, not your post, maybe I should have quoted it, I figured since it is in chronological order I would not have to.

 

[GiAnT4LYFE 10+ year member]

all alternators do less at idle your stock is 110 but at idle it prob does 60 or what not, put your ac on then drive youll notice it will blow harder and get colder, more power you will be doubling your power save time and effort, its an easy change on the grand prix.

Where did you get your h/o alternator for your Grand Prix from? I got a 2004 and am looking into one. Thanks.

 

[DeathByWaffle 10+ year member]

It's not, but it's a huge pet peeve of mine and a lot of others on here, too. Really, it's not that hard to use proper grammar and punctuation when posting. Not only is it easier for others to read and understand, but it makes you a better person.

Ok. Fine. Ill use proper grammar.

 

[ejschultz 10+ year member]

^^^Thanks, and welcome to the forum! //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

 

[DeathByWaffle 10+ year member]

Well thank you. Just joined last night

 

[ejschultz 10+ year member]

I could tell by the grammar...

 

[DeathByWaffle 10+ year member]

Ya. Things happen for a reason.

 

[Xanthous 10+ year member]

I'm about to buy this; High Output Alternator PONTIAC GRAND PRIX 3.8L 99-2000 | eBay

I should be fine then, right?

-What amp rating fuse do I need for my power wires? 250?

1600rms/12 volts = 13 amps /.70 (70 percent efficiency of amp)=190 amps. 190 amps is the maximum current the amps should draw at full tilt in a burp scenario(if you dont drop below 12 volts). If your listening to music only you can cut that number in 1/2 (some people say 1/3). If your careful and you monitor your voltage drop, you may be able to get away with a stock alternator if your planning on listening to music only, but I would not recommend cutting it that close. If I was in your shoes, I would at least get a decent battery in back. An upgraded alternator is always the best choice because it will provide your amps with good voltage.

A 105 amp stock alt is enough for a 190 amp system? why?

Thanks guys, i appreciate all the help.