Alternator help

 

Bronze Member
Username: Sleste8

Shelbyville, MI United States

Post Number: 19
Registered: Mar-10
what kind of HO alts do you guys recommend?

also, what size.

and should i just have my stocker rebuilt instead of buying new?

i have a 2001 jeep cherokee sport. thanks to everyone who replys.
 

Platinum Member
Username: Glasswolf

Columbia, SC USA

Post Number: 12553
Registered: Dec-03
I believe yours is a Denso casing alternator. They can be rebuilt to maybe 120A. That's always an option.

the size will depend on your needs. Those of your system, and the car itself.

for alternators, MCR is good (motor city reman) as is Wrangler, Ohio Generator, Stinger, and a number of others, depending on your budget.
 

Bronze Member
Username: Sleste8

Shelbyville, MI United States

Post Number: 23
Registered: Mar-10
ive ben looking at ohio gen's HO alts.

eventually ill get another PRS-D2000SPL, so 2 of these,

and a small 4-channel for 2 sets of components.

what amperage would you recommend?

because im no expert but i dont think 120a is guna be enough.

the voltage was droping all the way down, and the check guages light was coming on. and thats only with the one amp???
 

Platinum Member
Username: Glasswolf

Columbia, SC USA

Post Number: 12569
Registered: Dec-03
figure out what the load will be on each amp (*usually* it's two ohms on a sub amp and 4 ohms on the full range multichannel amp) and see waht the output is for each amp at those loads in RMS wattage.
Let me know what the total is for each amp individually (efficiency will be different for each amp) and I can ballpark what you'll need.
remember an amp rated at 1000 watts doesn't mean it draws that much power continuously, so you can suually take a percentage of that for continuous listening use power consumption.
 

Bronze Member
Username: Sleste8

Shelbyville, MI United States

Post Number: 36
Registered: Mar-10
i will have to do that in the mourning and let you know, in the meantime what do you think of this??

any good? too good to be true?

http://powerbastards.com/proddetail.asp?prod=Fitzall%2D220
 

Platinum Member
Username: Glasswolf

Columbia, SC USA

Post Number: 12587
Registered: Dec-03
price looks fair

Total Output: 220+ AMPS
Idle Output: 110+ AMPS
Full Output at 1200 RPM !

do note the drop in output at idle. this is typical of a rewound or OE alternator (as opposed to one build by a place like Iraggi, specifically for audio use) so below 1200rpm, you won't be at full output.
This isn't a big deal as long as you're aware of it, and don't mind revving the engine just slightly at idle if you need the extra juice.
 

Bronze Member
Username: Sleste8

Shelbyville, MI United States

Post Number: 40
Registered: Mar-10
good point, i didn't even think about the idle output.

i was just looking at the 220+A, and the full output at only 1200RPM's

what type of alt do u have glasswolf??
or had in the past?

(please specify) if you would
 

Bronze Member
Username: Sleste8

Shelbyville, MI United States

Post Number: 41
Registered: Mar-10
figure out what the load will be on each amp (*usually* it's two ohms on a sub amp and 4 ohms on the full range multichannel amp) and see waht the output is for each amp at those loads in RMS wattage.
Let me know what the total is for each amp individually (efficiency will be different for each amp) and I can ballpark what you'll need.
remember an amp rated at 1000 watts doesn't mean it draws that much power continuously, so you can suually take a percentage of that for continuous listening use power consumption.

so for the PRS-D2000SPL's, they will both be at 1ohm-2000watts RMS each

plus a 10ZX350.4 at 4ohm's 60wattsX4 RMS

so roughly 4240 watts RMS continuous???

this kinda seems like a LOT for an RMS rating, did i do it right?
 

Platinum Member
Username: Glasswolf

Columbia, SC USA

Post Number: 12603
Registered: Dec-03
yeah that's correct. you'll really want a couple of batteries in back, isolated from the starter battery and wired in parallel.

that's a draw at full output of 428A, but figure at half of full volume, continuous, you're talking a tenth of the power, so around 50A, plus another 50A for the car's needs, so that 220A alt would be fine.
The additional power available is good for sudden burst demands.

My last car had a Lestek alternator in it. My current car has an MCR custom wound alternator.
 

Bronze Member
Username: Sleste8

Shelbyville, MI United States

Post Number: 47
Registered: Mar-10
thanks again,

your really helping me understand everything.

im starting to figure it all out now

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