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Modified Tech Discussion Forum for Tech related discussion for Modified XJ's and MJ's. |
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#1
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alternator up grade- amps @ idle
looking to upgrade the 90 amp alternator. it realy struggles with the AC and the taurus fan in summer, thats with out the headlights.
to 136 or 160. there is $100 dollar difference, no junk yard options here. At idle, or even 1500 rpm how much more is the 160 going to produce over the 136? Cause my understanding was the rated amprages were at higher RPMs. |
#2
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Re: alternator up grade- amps @ idle
What year is your XJ? The connector changed in 99 models. 98 and down can use the 136 amp from the ZJ and some Dodge/Ram, 99 and later can use the 160 amp from Dodge/Ram
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#3
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Re: alternator up grade- amps @ idle
its 95 they have one in both amprages, same actual size that will fit with the 95 connector. No real junkyard options, been looking for about 4 years now for a 136, whicg were were supposed to get here........no luck so far, summer is comming.
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#4
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Re: alternator up grade- amps @ idle
You would benefit more from the larger case 160 AMP alternator if you could find one and get it to fit. They produce more voltage at low RPM which is what you really need. Some massaging of the brackets may be necessary.
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Patrick ![]() 1996 XJ; 4.0L; AW4; NP231; SYE; D30 and D44; ECTED; 4.10 gears; 30X9.5 -15 BFG/AT/KO; 3" lift; Rusty's LCA; JKS ADJ UCA; Kevins ADJ Track bar; Drawtite Front Receiver; Dual Electric Fans; Dual Battaries. |
#5
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Re: alternator up grade- amps @ idle
thanks that's what i was asking.
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#6
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Re: alternator up grade- amps @ idle
I think you may be able to add a smaller pully for some more juice to.
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#7
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alternator up grade- amps @ idle
Fitment is the problem. I bought a Ram alt when mine shit the bed at Hidden Falls. Case wouldn't fit between the rail and the frame rail.
I probably need motor mounts but also have a small tcase drop so not sure where that leaves me in terms of more or less space between my rig and others. Just know that a 160 wouldn't fit Sent from my SM-G975U using Tapatalk |
#8
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Re: alternator up grade- amps @ idle
Quote:
Sent from my SM-G975U using Tapatalk |
#9
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Re: alternator up grade- amps @ idle
thanks all. Its RHD the alternator is up high where the A/c usualy goes- no frame rails. the brackets will need to be massaged as both the 136 and the 160 are the same size, but bigger than the stock 90 unit.
smaller pully is worth looking like. |
#10
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Re: alternator up grade- amps @ idle
please update this thread with what pulley you decide to use and which alternator you with if you decide to stray from 90amp.
thanks! |
#11
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Re: alternator up grade- amps @ idle
Don’t forget to upgrade your cables when swapping the alternators out.
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#12
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Re: alternator up grade- amps @ idle
I put a Durango 160A out of a late 1990s or early 2000s into my 1995 without much issue. I had to grind the block and timing cover to get it to fit, but its in there without any issues. I'm running the late style belt arrangement due to intake and PS pump swap. I used the old pulley off my old 90A alternator without any issues. The plug is different, but you just get the plug that goes with the OBDII alternators to put them in a OBDI HO engine.
Ran 2ga wires with Blue Sea high amp fuses on everything and Mil-Spec battery terminals. No issues with power or dimming lights any more. I've got three Spal 10" fans on a Flex-a-Lite PWM fan controller. Stock voltmeter still dips and does weird shit, but I've stopped paying it attention at this point. |
#13
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Re: alternator up grade- amps @ idle
So went with the 160. was plug and play for the 95 loom., came with a pully that was same as the stock one. Already had the wiring upgrade.
its much hapier makes target voltage with taurus fan and aux fan running at idle, Ac as well. |
#14
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Re: alternator up grade- amps @ idle
So went with the 160. was plug and play for the 95 loom., came with a pully that was same as the stock one. Already had the wiring upgrade.
its much hapier makes target voltage with taurus fan and aux fan running at idle, Ac as well. |
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