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modern alt. swaps for BB, highest idle amps? update
#32024
11/19/06 05:33 PM
11/19/06 05:33 PM
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Joined: Jan 2003
Posts: 3,336
Summit, NJ
whiplash
OP
master
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OP
master
Joined: Jan 2003
Posts: 3,336
Summit, NJ
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Chasing some gremlins, low idle voltage at noght with headlights and fans on, have the stock 65 amp 2 field alternator.
Between the headlamps, electric fans, efi, and ignition, I am probably real close to that number. I would lie to know:
what is the rating at idle of the more common modern alternator swaps that you have done?
Which is the easiest to do?
Do they have a press on pulley? or is the shaft the same dia as the std mopar unit?
thanks
- 67 coronet 4dr, 383/727/GVOD, blown, EFI, daily driver
- 230/238, 114°LSA cam, 1.6 rollers, 9:1 comp, 8 psi boost
- NEW BEST ET - 12.40@110mph...
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Re: modern alternator swaps for BB, highest amp at idle?
[Re: Jerry]
#32027
11/19/06 07:19 PM
11/19/06 07:19 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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i put on a 100 watt one with no issues
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Re: modern alternator swaps for BB, highest amp at idle?
[Re: Jerry]
#32028
11/19/06 10:08 PM
11/19/06 10:08 PM
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Joined: Jan 2003
Posts: 3,336
Summit, NJ
whiplash
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OP
master
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Summit, NJ
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Quote:
i'v egot a 120 on ym serpentine big block setup. this same style also has a 140 amp available.
Jerry,
More details, please.
pic, alt year models, any mods to the stock brackets, etc...
- 67 coronet 4dr, 383/727/GVOD, blown, EFI, daily driver
- 230/238, 114°LSA cam, 1.6 rollers, 9:1 comp, 8 psi boost
- NEW BEST ET - 12.40@110mph...
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Re: modern alternator swaps for BB, highest amp at idle?
[Re: whiplash]
#32029
11/19/06 10:37 PM
11/19/06 10:37 PM
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Joined: Oct 2004
Posts: 902
Bellevue, WA
Blackwidow69
Ring Knocker
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Ring Knocker
Joined: Oct 2004
Posts: 902
Bellevue, WA
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Whiplash,
I converted over to a one wire internal regulated Powermaster unit and have had good luck. I don't have all the electrical stuff you do but I bought the 74191 model from Summit and it does only say 75 amp but mine came with a Proof of Performance tag that shows 56 amps at idle and 91 amps at highway speed. Although it does say 2400 rpm below the idle statement so not to sure who idles their engines at 2400 rpm. Either way it outperforms the 75 amp stated number and should be enough for you. Plus it gets rid of the voltage regulator if you have one and knocks down the number of wires that may be causing you issues. It also mounts right into your current bracket as it is the same type of housing. I put in a Mallory Unilite as well so no ballast resistor for me either which really simplifies my engine compartment. But be careful putting any of these big alternators in if you are using a stock wiring harness anywhere. Good luck with your hunt.
Todd
1969 Ply Roadrunner, 383 4-speed on street tires.
3,830 lbs race weight.
Best 1/4: 13.1 @ 106.83
440 & overdrive 4 speed going in.
2005 Power Wagon 35X12.5 KM2's
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Re: modern alternator swaps for BB, highest amp at idle?
[Re: Blackwidow69]
#32030
11/19/06 11:20 PM
11/19/06 11:20 PM
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Joined: Jan 2003
Posts: 6,988
Warren, MI
Jerry
master
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master
Joined: Jan 2003
Posts: 6,988
Warren, MI
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heres a pic of the kit...  i primarily built this kit so i wouldn't have to futz with all the different bracket and pulley combos. also i switch the engine over to efi with a megasquirt computer and have had no electrical problems. i also run dual electric fans and nice stereo. i know this might now fit with your supercharger setup, but i'd be willing to look into modifying it since i'm hoping to put a supercharger on my 440 as well.
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Re: modern alternator swaps for BB, highest amp at idle?
[Re: Blackwidow69]
#32031
11/20/06 08:36 AM
11/20/06 08:36 AM
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Joined: Jan 2003
Posts: 3,336
Summit, NJ
whiplash
OP
master
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OP
master
Joined: Jan 2003
Posts: 3,336
Summit, NJ
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Quote:
Whiplash,
I converted over to a one wire internal regulated Powermaster unit and have had good luck. I don't have all the electrical stuff you do but I bought the 74191 model from Summit and it does only say 75 amp but mine came with a Proof of Performance tag that shows 56 amps at idle and 91 amps at highway speed. Although it does say 2400 rpm below the idle statement so not to sure who idles their engines at 2400 rpm. Either way it outperforms the 75 amp stated number and should be enough for you. Plus it gets rid of the voltage regulator if you have one and knocks down the number of wires that may be causing you issues. It also mounts right into your current bracket as it is the same type of housing. I put in a Mallory Unilite as well so no ballast resistor for me either which really simplifies my engine compartment. But be careful putting any of these big alternators in if you are using a stock wiring harness anywhere. Good luck with your hunt.
Todd
You wouldn't happen to have a part number, would you? I'm a little hesitant to go with a non-OEM application that I can't get at a local parts stor because it is my daily driver, I'd have to borrow a car if the alt cr@ps out....
- 67 coronet 4dr, 383/727/GVOD, blown, EFI, daily driver
- 230/238, 114°LSA cam, 1.6 rollers, 9:1 comp, 8 psi boost
- NEW BEST ET - 12.40@110mph...
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Re: modern alternator swaps for BB, highest amp at idle?
[Re: Jerry]
#32032
11/20/06 08:38 AM
11/20/06 08:38 AM
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Joined: Jan 2003
Posts: 3,336
Summit, NJ
whiplash
OP
master
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OP
master
Joined: Jan 2003
Posts: 3,336
Summit, NJ
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Jerry,
Do you have a kit for just the alt?
And is the alt a press fit? I have a march serpentine setup that is a press fit alt pulley.
What about the guys who adapted the mid-late 80's GM style alternator? how are they at idle for amp capacity?
Thanks all...
- 67 coronet 4dr, 383/727/GVOD, blown, EFI, daily driver
- 230/238, 114°LSA cam, 1.6 rollers, 9:1 comp, 8 psi boost
- NEW BEST ET - 12.40@110mph...
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Re: modern alternator swaps for BB, highest amp at idle?
[Re: whiplash]
#32034
11/20/06 11:03 AM
11/20/06 11:03 AM
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Joined: Feb 2003
Posts: 2,928
A tad North of Indy
Blown71X
super gas
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super gas
Joined: Feb 2003
Posts: 2,928
A tad North of Indy
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Quote:
What about the guys who adapted the mid-late 80's GM style alternator? how are they at idle for amp capacity?
I know this isn`t a serpentine pulley but they are available with one, I went with this specific piece because it comes with a V and that`s what I needed, All of the later GM`s will have a bolt on pulley and March makes a pulley for them so that is a minor issue. I looked thru alot of different case styles and this app fits OE brackets with no mods, the only thing that needs to be fabbed is a rear spacer, It needs to be 3 inches long, it is off of a 89 caddy with a 5.0 liter, I`ve seen 46 amps out of it at idle (850 rpm) and it is rated at 105. With all the crap on my car I have had no issues and to date it has slightly over 180 6500+ rpm shift 1/4 mile passes and 8-9000 street miles with no issues. The plus is it is easily available, which was a concern..
There are lots of ways to upgrade, this is just my  worth.
Rick
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Re: modern alternator swaps for BB, highest amp at idle?
[Re: Blown71X]
#32035
11/20/06 12:00 PM
11/20/06 12:00 PM
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Joined: Jan 2003
Posts: 3,336
Summit, NJ
whiplash
OP
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OP
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Posts: 3,336
Summit, NJ
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Blown,
That's the kind of alternator I was looking for, now I just need to find the application with a 6 rib pulley, I don't mind running the stock 6 rib while I shake things down..
How did you wire it up?
thanks again.
- 67 coronet 4dr, 383/727/GVOD, blown, EFI, daily driver
- 230/238, 114°LSA cam, 1.6 rollers, 9:1 comp, 8 psi boost
- NEW BEST ET - 12.40@110mph...
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Re: modern alternator swaps for BB, highest amp at idle?
[Re: Jerry]
#32037
11/20/06 12:41 PM
11/20/06 12:41 PM
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Joined: Jan 2003
Posts: 3,336
Summit, NJ
whiplash
OP
master
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OP
master
Joined: Jan 2003
Posts: 3,336
Summit, NJ
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Jerry,
Not a bad idea, the march crank pulley is 6", don't know what the stock ratio is.
Do you have the capability to make crank pullies? I was lloking for a crank pulley that has a 6 rib and 8 rib of 6-7" in diameter, can you do that?
- 67 coronet 4dr, 383/727/GVOD, blown, EFI, daily driver
- 230/238, 114°LSA cam, 1.6 rollers, 9:1 comp, 8 psi boost
- NEW BEST ET - 12.40@110mph...
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Re: modern alternator swaps for BB, highest amp at idle?
[Re: whiplash]
#32038
11/20/06 01:34 PM
11/20/06 01:34 PM
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Joined: Feb 2003
Posts: 2,928
A tad North of Indy
Blown71X
super gas
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super gas
Joined: Feb 2003
Posts: 2,928
A tad North of Indy
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If I remember right there is a application for the same year caddy with a different engine that has the same case clocking with a serpentine pulley, tho I don`t remember how many ribs.
Personally and after fighting the OE cryco alternator(3 of them), I wouldn`t even try to use one with anything other than a bone stock configuration, the only way a OE chrysler alternator will even come close to the output of any late alternator especially at low speeds is if lightening hits it. Just my injectors (16) draw close to 22 amps at 60%..add in 2 fuel pumps,fans,inverter for a laptop,ECU,MSD,and just the load of the normal crap in the car and a OE alternator dosen`t stand a chance.
Wiring diagram is attached, i`ve done several of these for people and walked several others thru doing it for themselves and everybody has been satisfyed. If you subscribe to the madelectrical theory (I don`t) You can run the "S" (sense) wire to a common distribution point for "supposedly" better voltage sense, but that is your choice.
Rick
edit: I`ll add this to....if you are running EFI with a OE chrysler alternator and you think it is ok, Go take a look at your Gross Voltage correction (if you have this ability)while at idle and cruise, you won`t like what you see.
Blown71X V2.0 under construction
71 Cuda 383 4-SPD (maybe for sale)
2010 Challenger B5 Classic
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Re: modern alternator swaps for BB, highest amp at idle?
[Re: Blown71X]
#32041
11/20/06 04:22 PM
11/20/06 04:22 PM
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Joined: Jan 2003
Posts: 3,336
Summit, NJ
whiplash
OP
master
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OP
master
Joined: Jan 2003
Posts: 3,336
Summit, NJ
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Quote:
Feets
If I remember right there is a application for the same year caddy with a different engine that has the same case clocking with a serpentine pulley, tho I don`t remember how many ribs.
edit: I`ll add this to....if you are running EFI with a OE chrysler alternator and you think it is ok, Go take a look at your Gross Voltage correction (if you have this ability)while at idle and cruise, you won`t like what you see.
exactly what is driving this post.
Is that a CS-130 alternator?
In the wiring diagram, that assumes a 1 field application, correct? I upgraded to the 2 field with the solid state regulator, so what do I do with the other field wire?
- 67 coronet 4dr, 383/727/GVOD, blown, EFI, daily driver
- 230/238, 114°LSA cam, 1.6 rollers, 9:1 comp, 8 psi boost
- NEW BEST ET - 12.40@110mph...
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Re: modern alternator swaps for BB, highest amp at idle?
[Re: whiplash]
#32042
11/20/06 05:30 PM
11/20/06 05:30 PM
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Joined: Feb 2003
Posts: 2,928
A tad North of Indy
Blown71X
super gas
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super gas
Joined: Feb 2003
Posts: 2,928
A tad North of Indy
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Quote:
Is that a CS-130 alternator?
Yes
Quote:
In the wiring diagram, that assumes a 1 field application, correct? I upgraded to the 2 field with the solid state regulator, so what do I do with the other field wire?
Having an isolated or grounded field alternator is moot at this point, all that is required is a 12 volt switched feed to the "turn on" on the CS (wire with the resistor) I drew up that diagram for someone that had a isolated field system hence the reference to hooking it to the existing field "feed" wire, you can get that switched feed from anywhere you want. It is internally regulated so just tie back your added field return wire and toss the external regulator.
Rick
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Re: modern alternator swaps for BB, highest amp at idle?
[Re: Blown71X]
#32043
11/20/06 10:06 PM
11/20/06 10:06 PM
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Joined: Jan 2003
Posts: 3,336
Summit, NJ
whiplash
OP
master
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OP
master
Joined: Jan 2003
Posts: 3,336
Summit, NJ
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(insert smiley with lightbulb turning on overhead)
got it, thanks!!
- 67 coronet 4dr, 383/727/GVOD, blown, EFI, daily driver
- 230/238, 114°LSA cam, 1.6 rollers, 9:1 comp, 8 psi boost
- NEW BEST ET - 12.40@110mph...
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