Whats needed when upgrading to a HO alternator?
Originally Posted by oneBADDz
you don't knwo what you're talking about and you brought animosity to this thread for absolutely no reason.
Do the math smart guy, if it makes 146.8 at 833 rpm and 189.1 at 1000 rpm, then you take into account the diminishing increase in amperage as rpms increase you will come up with approx 166.x amps at 900 rpm. Even if you suck at math it doesn't take a smart fella to know that at 900rpm it will be greater output than at 833rpm. If you use a different math approach, you come up with 157 amps at 900 rpm. Either way, I'm right and I don't understand how you don't comprehend the facts here. Thanks you, come again.
Do the math smart guy, if it makes 146.8 at 833 rpm and 189.1 at 1000 rpm, then you take into account the diminishing increase in amperage as rpms increase you will come up with approx 166.x amps at 900 rpm. Even if you suck at math it doesn't take a smart fella to know that at 900rpm it will be greater output than at 833rpm. If you use a different math approach, you come up with 157 amps at 900 rpm. Either way, I'm right and I don't understand how you don't comprehend the facts here. Thanks you, come again.
I also didn't "bring animosity" to the thread, RooRnZ28's comments to me brought this all on. I gave my opinion and he gave me sarcastic remarks.
It is kind of funny the one acting like he was going to post some profound resonse before you (oneBADDz) posted started this thread with:
Originally Posted by RooRnZ28
hey all... ok i know next to nothing about electronics, so bear with me!
Good 4 gauge will flow around 120 amps.
Good 0/1 gauge will flow around 300 amps.
4 guage will be too small for a 235 amp alternator.
Thread Starter
Joined: Dec 2005
Posts: 1,392
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From: Central California
haha... its funny you say that because you were the one that was being a jackass in the first place.
and in regards to oneBADDz's post, anyone with any kind of math skill can read a graph and figure out simple math...in this case it is a graph of what the alternator puts out at a certain rpm. it doesnt take some electrical engineering degree figure that one out. and its just a "dyno graph" of the damn alternator... no need to get all butt hurt over numbers on paper.
and in regards to oneBADDz's post, anyone with any kind of math skill can read a graph and figure out simple math...in this case it is a graph of what the alternator puts out at a certain rpm. it doesnt take some electrical engineering degree figure that one out. and its just a "dyno graph" of the damn alternator... no need to get all butt hurt over numbers on paper.
I used the ratio 2.372 as well in my first calculation and got different results, but after more research the actual ratio is in fact right at 3.0 as the other two guys posted when they said "divide by three." The ratio right off the sheet is not accurate for calculation of engine RPM vs alternator RPM.
Originally Posted by oneBADDz
I used the ratio 2.372 as well in my first calculation and got different results, but after more research the actual ratio is in fact right at 3.0 as the other two guys posted when they said "divide by three." The ratio right off the sheet is not accurate for calculation of engine RPM vs alternator RPM.
Originally Posted by RooRnZ28
haha... its funny you say that because you were the one that was being a jackass in the first place.
and in regards to oneBADDz's post, anyone with any kind of math skill can read a graph and figure out simple math...in this case it is a graph of what the alternator puts out at a certain rpm. it doesnt take some electrical engineering degree figure that one out. and its just a "dyno graph" of the damn alternator... no need to get all butt hurt over numbers on paper.
and in regards to oneBADDz's post, anyone with any kind of math skill can read a graph and figure out simple math...in this case it is a graph of what the alternator puts out at a certain rpm. it doesnt take some electrical engineering degree figure that one out. and its just a "dyno graph" of the damn alternator... no need to get all butt hurt over numbers on paper.
Originally Posted by 95bat
You can put any pulley size on an alternator. 3 might be the stock size, but they're advtertising 2.3 for their pulley ratio. I'm going with what they say they use.
get it? It may be static on the alternator, but it will vary car to car. On an LS1 without underdrives it comes out to 3. That alternator doesn't drive itself once installed in a car
Originally Posted by oneBADDz
Correct, and you are right. but when calculating emgine RPM/alternator RPM you HAVE to take into account the pulley on the other end of the belt get it? It may be static on the alternator, but it will vary car to car. On an LS1 without underdrives it comes out to 3. That alternator doesn't drive itself once installed in a car
get it? It may be static on the alternator, but it will vary car to car. On an LS1 without underdrives it comes out to 3. That alternator doesn't drive itself once installed in a carThe alternator pulley ratio is for the alternator pulley, not the other pulleys
If the stock ratio is 3 then this alternator does not use the stock ratio.I still wouldn't have bought that alternator, I would have went with another one that gives more power at idle
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Originally Posted by 95bat
I understand what you're saying. I also think we're taing far too much into account, such as belt speed and other pulley sizes, than is needed for this thread.
The alternator pulley ratio is for the alternator pulley, not the other pulleys If the stock ratio is 3 then this alternator does not use the stock ratio.
I still wouldn't have bought that alternator, I would have went with another one that gives more power at idle I think idle output is one of the most important factors in deciding which alternator to buy.
The alternator pulley ratio is for the alternator pulley, not the other pulleys
If the stock ratio is 3 then this alternator does not use the stock ratio.I still wouldn't have bought that alternator, I would have went with another one that gives more power at idle
I think idle output is one of the most important factors in deciding which alternator to buy.
Joined: Nov 2003
Posts: 11,332
Likes: 346
From: Jacksonville, FL (originally from Toronto Canada)
Ian, to answer your question while these guys fight over trivia, here are the removal instructions from the manual:
1. Disconnect the negative battery cable
2. Remove the accessory drive belt
3. Raise the vehicle
4. Remove the positive cable from the alternator by sliding the boot back and removing the nut.
5. Remove the alternator rear bracket
6. Remove the transmission oil cooler lines from the oil cooler clip.
7. Remove the front alternator mounting bolts and oil cooler clip.
8. Disconnect the alternator electrical connector
9. Remove the alternator
The larger replacement alternator will not use the rear mounting bracket or the cooling duct that was on the original.
1. Disconnect the negative battery cable
2. Remove the accessory drive belt
3. Raise the vehicle
4. Remove the positive cable from the alternator by sliding the boot back and removing the nut.
5. Remove the alternator rear bracket
6. Remove the transmission oil cooler lines from the oil cooler clip.
7. Remove the front alternator mounting bolts and oil cooler clip.
8. Disconnect the alternator electrical connector
9. Remove the alternator
The larger replacement alternator will not use the rear mounting bracket or the cooling duct that was on the original.
Last edited by WhiteBird00; Sep 12, 2007 at 07:17 AM.
It's in and let me say...WOW what a difference. My alternator with 176,000 on it would keep the car running no problem, never move around alot, and run my system without issue. It just recently started having problems when warm. It charged up fine and would then drop like an anchor after about 20 minutes in the GA heat.
My new one stays above 13V at idle and stays there. Big improvement!! Thanks again Whitebird for the installation diagrams!!
My new one stays above 13V at idle and stays there. Big improvement!! Thanks again Whitebird for the installation diagrams!!
