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Old 02-04-2007   #1 (permalink)
 
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Default Alt overdrive pulleys

I come from the high performance world...

And I know for some cars there are Alt overdrive pulleys available..

The reason they exist..is in racing people use Underdrive pulleys to get the drag off the motor from the accessories.. So they spin everything less (large diameter crank pulley)...and usually what happends is the alt is driven to slowly and people have charging problems..

To combat that, they have created Overdrive Alt Pulleys (smaller diameter) so that while everything else is underdriven...the overdriven alt pulley drives the alt at its regualr speed.

Now if we were to use said pulleys on a NON Underdriven car, then we should get a much better Power at idle and not have to rev the motor to get peak output.

Also should aid in charging the batt if u run your system with the Car off.

Just a thought...
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Old 02-04-2007   #2 (permalink)
 
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they already sell overdrive pulleys, iraggi, etc supplies there alts with them
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Old 02-04-2007   #3 (permalink)
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Welcome to Realm!


Yes, I have been in the bracket scene for a while, and underdrive pullies are a effective method for freeing up off the line horsies... And Overdrive alt pullies do well at raising IDLE amperage, creating the extra spark to run that MSD Tower II coil but not to the point you would think. My Tundra, at Idle in gear, turns 450 RPMs, It has a fuel/air mod, and some ignition mods. My 200 A EA alt with a overdrive pulley Barely charges at that RPM... at 1000, it produces around 100A and at 1800 about 200A.

I would definately say: IF YOU HAVE:

An Aftermarket sound system, DO NOT run your stereo with the engine OFF! It can do damage to your alternators internals.
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Old 02-04-2007   #4 (permalink)
 
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Originally Posted by Toyota Thundra View Post
Welcome to Realm!


An Aftermarket sound system, DO NOT run your stereo with the engine OFF! It can do damage to your alternators internals.
Thanks for the Welcome..

And I've never heard about the damage to alt internals by running the stereo with the engine off?

Is it just because the alt had to do 100% when it comes on?
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Old 02-04-2007   #5 (permalink)
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Thanks for the Welcome..

And I've never heard about the damage to alt internals by running the stereo with the engine off?

Is it just because the alt had to do 100% when it comes on?
No... When I bought my EA Alt... Nate sent me a sheet saying the following:

"..... we will not warranty any alternator that has burnt diodesm stator, or regulators, ect. as a result of playing the stereo with the vehihicle not running."
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Old 02-04-2007   #6 (permalink)
 
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Originally Posted by Toyota Thundra View Post
No... When I bought my EA Alt... Nate sent me a sheet saying the following:

"..... we will not warranty any alternator that has burnt diodesm stator, or regulators, ect. as a result of playing the stereo with the vehihicle not running."

Hrmmm wonder if we can get a full explanation of that...
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Old 02-08-2007   #7 (permalink)
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I'd like to hear the explanation on that as well. I can't think of any reason that would be a possible problem.
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Old 02-08-2007   #8 (permalink)
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I dunno... but If it says its bad for it, Im not gonna do it.. Plus, my voltage drops would be baaad LOL
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Old 02-08-2007   #9 (permalink)
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ye...me 3....deffinately wanna hear that explanation...
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Old 02-09-2007   #10 (permalink)
 
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Quote:
Originally Posted by Toyota Thundra View Post
I dunno... but If it says its bad for it, Im not gonna do it.. Plus, my voltage drops would be baaad LOL
That's why you fill your bed with batteries lol
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Old 02-09-2007   #11 (permalink)
 
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explanation.. in the most simplest terms..

an alternator is not a battery CHARGER

it is a battery MAINTAINER

your alternators main function is to provide 14 volts to the vehicle. its secondary function is to peak off the juice that was drained from your battery by the starter.

your batteryes function is simply to provide power to the starter, when starting the engine.


if you are pounding your system with your Car off, and drianing your battery, then when you start your car, your alt now has two MAIN jobs.. run the vehicle AND fully re-charge the battery.

they weren't built to fully recharge batteries.

even with my 300 amp alt in my truck, with adjustable regulation to 17volts.. you never see me at a show without a battery charger.

i depend on my battery charger to recharge my battery, not my alternator.


basically, if you are making your alt double up all the time.. its kind of like making it work overtime, without having a break or a day off. its going to burn up and die.


as for the pullys. yes they work, and you can make the alt rotate at a higher speed so it produces more power.... but you run int othe same problem.. if you are ALWAYS doing this..... guess what... its going to die sooner than it should.

that's what drew me away from EA alts.. because nate was talking about how his alts do thier pwoer at lower rpm speeds than other manufacterers.. well, thats great, untill you realize that the alt is never getting a break, and thats why so many people have problems with them. (i'm not slamming nate or EA here, i realize that PLENTY of people have NO problems with his products.. just using him as an example)

personally, iwould NOT use anything that the standard pully on my alts.

i have 3 ho alts in 3 different vehicles..

the festiva just got its installed. the truck got its installed last year.. and the buick has had its alt since 04. none of them have ever had any problems.
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Old 02-09-2007   #12 (permalink)
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good job pornstar..i get it now..thanx
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Old 02-09-2007   #13 (permalink)
 
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Quote:
Originally Posted by pornstar View Post
explanation.. in the most simplest terms..

an alternator is not a battery CHARGER

it is a battery MAINTAINER

your alternators main function is to provide 14 volts to the vehicle. its secondary function is to peak off the juice that was drained from your battery by the starter.
I agree to a point...If you are always making your alt charge your batteries...

But a 300amp alt puts out more power than a normal battery charger..

Why can't it charge batteries?

And alt is just a generator...no different than a gas powered one you use for camping or your home (besised the ac/dc part).

It doesn't know or care what it's supplying power too.

The only thing that i can think of, is that making it work harder causes it to heat up more...which is not that good for solidstate parts and causes them to fail.

I don't think there is a Physical Limitation of the alt that it can't keep charging batteries.

If there were a way to keep an alt cool all the time, I'm sure you could charge at full duty all day long...
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Old 02-09-2007   #14 (permalink)
 
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to understand..

you need to realize there is a differance between voltage and amperage.

you can charge batteries in a few different ways.

ie:

high amperage, low voltage.

low voltage, high amperage.

low voltage, low amperage.

high voltage, high amperage.

as yo ucan see, there is a differance...

if you expect an alternator to provide high voltage and high amperage, to recharge dead batteries... dont expect it to last long.


disagree all you want.

but when you have over 20 years of experience manufacturing high output alternators like my manufacturer does.. then i'll start listening to you instead of them

it was yo uthat said "Hrmmm wonder if we can get a full explanation of that..."

i justr gave you one. direct from one of the most respected high output alternator manufacturers around..

and you disagree with it.

why would you have asked for an explanation in the first place.. it appears you already know all you need to know.

to say i'm confused would be an understatement.
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Old 02-09-2007   #15 (permalink)
 
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Quote:
Originally Posted by pornstar View Post
if you expect an alternator to provide high voltage and high amperage, to recharge dead batteries... dont expect it to last long..
This is what I don't understand? Why won't it last long? what part is wearing out by doing this? What part is breaking down under this load?

An alt isn't a magic spining wheel...it's whinding, stators, brushes and a rectifier.

The manufacturer is saying "dont do this cuz I said so" and you are correctly saying "OK"

I'm taking it one step further and being the whiney kid and going "but why, but why?"
I'm not saying hes wrong, I DO understand the way this works and just trying to get a bit more insight of the EXACT piece that is the limiting factor.

Quote:
Originally Posted by pornstar View Post
disagree all you want.

but when you have over 20 years of experience manufacturing high output alternators like my manufacturer does.. then i'll start listening to you instead of them

it was yo uthat said "Hrmmm wonder if we can get a full explanation of that..."

i justr gave you one. direct from one of the most respected high output alternator manufacturers around..

and you disagree with it.

why would you have asked for an explanation in the first place.. it appears you already know all you need to know.

to say i'm confused would be an understatement.
Well I hope I cleared somethings up.

Take a Mail truck for example...What's it's alternator do? Charge the heck out of the battery all the time cuz all they do is Start drive 2 ft stop....Start...alt gotta charge the battery hardcore...drive 2 ft shut it off etc etc....Maybe they go through alts every week...I don't know.. But seams curious they can do it...we can't and that starter i'm sure is drawing 200amps easy...prolly more like up here when it's freakin minus 0
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Quote:
Originally Posted by 05duallyon22s View Post
Take a Mail truck for example...What's it's alternator do? Charge the heck out of the battery all the time cuz all they do is Start drive 2 ft stop....Start...alt gotta charge the battery hardcore...drive 2 ft shut it off etc etc....Maybe they go through alts every week...I don't know.. But seams curious they can do it...we can't and that starter i'm sure is drawing 200amps easy...prolly more like up here when it's freakin minus 0
it charges it when it needs to be charged..............
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Old 02-09-2007   #17 (permalink)
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Bed is used for work FTL LOL
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I'm taking it one step further and being the whiney kid and going "but why, but why?"
i have a 10 year old daughter.... so i can relate to this...

i'll just be the annoyed parent and say ......

"Because i said so ! "
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Quote:
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i have a 10 year old daughter.... so i can relate to this...

i'll just be the annoyed parent and say ......

"Because i said so ! "
The reason I ask I guess is I'm part engineer...

So if you said "well the XYZ component overheats when trying to charge so much"

And then I say "well if I can keep it cool, will it work?"

YOu say "ya"

Then I can come up with a solution to keep XYZ cool and waalaaa problem solved..

I do think so far outside the box that some people hope that I come back down to earth so I can just even get close to the box lol...

And I'm not saying I'm any smarter than the guy who builds them...

But would an alternator builder necessary know about IC Chip cooling used in Supercomputers???
And vise versa, would a chip cooling company know about the need to cool Chips used in the voltage regulator of a HO alternator used in car stereo compettion?

Now you take someone who knows a little bit about both and who knows what you could come up with.
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Quote:
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i have a 10 year old daughter.... so i can relate to this...

i'll just be the annoyed parent and say ......

"Because i said so ! "

HAHAHAHA.
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Old 02-09-2007   #21 (permalink)
 
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my GUESS is that the resistors or stators get hot when they are constantly creating power.

so, you might be on to something. i dont know.


isnt the fan on the front of the alt there to keep it cool?
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my GUESS is that the resistors or stators get hot when they are constantly creating power.

so, you might be on to something. i dont know.


isnt the fan on the front of the alt there to keep it cool?
Right so maybe a more aggressive Blade setup on the Alt pulley would be able to help..Maybe even drilling the case out a bit with more holes to allow for better air circulation

Heck how easy would it be to rige up an enclosure for an alternator and cool it with DC fans....

There are liquid cooled computers...I'm sure a heat sink and a Cooling block to the case of the althernator would work as well...That could be connected to the vehicles cooling system...or heck even the Cold side of the A/C compressor...

Now If i could just actually make one of my designs I'd be rich lol..
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i have a 10 year old daughter.... so i can relate to this...

i'll just be the annoyed parent and say ......

"Because i said so ! "
LMMAO Thats a knee slapper. LOL
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or... just dont drain the battery

play the system with the vehicle on... or add more batteries....

viola.. problem solved .. without reinventing the wheel


like i said.. you may be onto something...

but, i have to think that at least one of the high output alt manufacturers have thought of something similar in the last 10 years...

maybe, maybe not.
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Right so maybe a more aggressive Blade setup on the Alt pulley would be able to help..Maybe even drilling the case out a bit with more holes to allow for better air circulation

Heck how easy would it be to rige up an enclosure for an alternator and cool it with DC fans....

There are liquid cooled computers...I'm sure a heat sink and a Cooling block to the case of the althernator would work as well...That could be connected to the vehicles cooling system...or heck even the Cold side of the A/C compressor...

Now If i could just actually make one of my designs I'd be rich lol..
And if one of us doesnt steal it LOL On the AC return Idea
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