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Very easy 2.4L 45 amp to 75 amp ALT. swap!

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(#1)

audioman1993
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Very easy 2.4L 45 amp to 75 amp ALT. swap! -

12-04-2008, 09:35 AM

I swapped out my stock '93 2.4L 45 Amp alternator for a remanufactured '90 2.4L Mitsubishi VAN-(wagon) stock 75 Amp alternator. It was a DIRECT BOLT-UP. All plugs and wires fit perfect as do the pivot bolt and mounting bolts. It even comes with a V-Belt pulley that is a little larger diameter than the old one (old pulley 2 3/4" - new pulley 3 1/8") so you don't have to change from a serpentine pulley like you do when using a Eclipse or Galant Alternator or so I've been told maybe I'm wrong. I guess the bigger pulley will slow the alternator down a little, but also act as a underdrive pulley giving some HP back to the engine. No modifications had to be made to the alternator mounting bracket and the new alternator uses two bolts to mount to the bracket instead of one so there is even less chance of the alternator moving and the belt loosening or falling off. I was also able to reuse the original V-Belt. I am planning a 450 Watt RMS stereo system and an electric radiator fan, that's why I did the upgrade. I just did this write up so it would be helpful for those planning on putting a heavy electrical load on their Alternator. ( Just a reminder the upgrade Alternator IS for a 1990 2.4L Mitsubishi VAN-(wagon).......NOT a Mitsubishi Expo 2.4L!.....NOT a Colt Vista 2.4L ! Also I bought it from Pep boys(it has a Limited Lifetime Warranty). Its a Prostart model # 15102 (the # on the ALT. is 14721).....(75 Amp), but it's tested max rating listed on the spec sheet that came with it says 102 Amps!

Last edited by audioman1993; 12-06-2008 at 01:54 AM.

Reason: Added lots of helpful missing info.

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(#2)

mightyman
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12-04-2008, 12:40 PM

Cool that sounds like a good find!

Kris

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(#3)

jecr
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12-04-2008, 09:56 PM

Hey audio,

I replaced my 45 amp alternator with the same 75amp Mitsu. Van alternator over the summer when I upgraded to electric cooling fan. By the way, how much did it run at Pepboys? I found mine on ebay for $70 shipped brand new.

By the way, here's my thread for installing a Taurus electric fan if you go that route.

http://www.mightyd50.com/forum/showthread.php?t=8904

I know Bessler's is just down the street from you, but Upull & Pay in Carthage is cheaper. electric fan only runs $14.99 and they have a 25% off coupon for this month. http://cincinnati.upullandpay.com/

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(#4)

captain91
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12-05-2008, 02:55 PM

what is the benefit of an electric fan?

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(#5)

MaxD50
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12-05-2008, 03:06 PM

Quote:

Originally Posted by captain91

what is the benefit of an electric fan?

Not really noticeable, Manual fans rob a little power but the electric fans draw loads of current and overworks the incorrect alternator on these trucks.

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(#6)

boostedmax
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12-05-2008, 04:50 PM

plus your don't get the annoying fan sound when you switch over

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(#7)

jecr
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12-05-2008, 05:14 PM

Quote:

Originally Posted by MaxD50

Not really noticeable, Manual fans rob a little power but the electric fans draw loads of current and overworks the incorrect alternator on these trucks.

for street use, the clutch fan is fine. As for more power, technically yes, but you can't tell.

I did the fan swap since I did the turbo swap and occasionally autox the truck. I would say the truck runs about 5-10 degrees cooler on the street which is not much, but I have the ability to cool the truck without the motor running between runs when I autocross.

And yes, an higher output alternator is needed. I ran the stock one for a week before I upgraded and it barely kept up.

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(#8)

audioman1993
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12-05-2008, 09:43 PM

I planned on using the electric fan so that I would gain a little horsepower (in turn maybe a little MPG). Also I want to use the electric fan so the engine will warm up faster on cold mornings since it won't turn on till the engine is up to Temp. unlike the manual fan that turns all the time reguardless of the engine Temp. blowing cold air on and through everything in the engine bay. I also thought my fan clutch may be going bad so instead of spending the money on a new fan clutch I just spent the money on an electric fan.

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(#9)

In2Deep
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12-06-2008, 12:03 AM

so do you have to change the original belt

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(#10)

audioman1993
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12-06-2008, 01:24 AM

I WAS able to reuse the original belt. Sorry I should have included that info in my original thread.

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12-06-2008, 09:14 AM

i.ll probly have to do this. im gettin all new stereo stuff for christmas and my alt probly wont be able to handle it

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lilred_D50
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12-19-2008, 06:37 PM

I got about 800 watts of stereo stuff (2 amps, 2 10's, cd player, and 6 disc changer) plus blue light in the grill and my stock alt does just fine even when i'm at a party and just have my radio goin

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(#13)

audioman1993
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12-19-2008, 09:52 PM

What size fuses are in the sides of your two amps. Also are you running an electric radiator fan like I am?

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TintedRam50
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12-19-2008, 10:13 PM

Im running hid headlights, 1200 watt amp, two 10s, electric fan, guages, with my stock alternator and it suxs. When bass hits my lights fade. my windsheild wipers hardly run when ive got everything to going. IM planning on a bosch 75 alternator.

As far as a electric fan goes, get an adjustable thermostate and wire straight to battery through acc switch and pull a fan out of a junked honda accord. Ive never had a problem with it.

Last edited by TintedRam50; 12-19-2008 at 10:17 PM.

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12-20-2008, 09:30 PM

I got forty 30 amp fuses and stock fan and i do have silverstar headlights forgot to mention that

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(#16)

audioman1993
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12-20-2008, 10:36 PM

I am also running Silverstar headlights. Do your lights dim down when the bass hits. Are you running any type of stiffening capacitor on the amp power wires? Also what kind of battery are you running? If your lights DO dim when the bass hits then your really beating up that alternator and battery and your not getting the full wattage out of those amps that you paid for ,also a lot more audio distortion/amp heat due to the amplifiers clipping from low amperage causing the battery to discharge too much. The stock Alt. is only 45 amps. If your lights Don't dim down than that is one bad ass ALT./BATT. set up that you've got. I have seen people install an Optima Yellow top battery to solve a light dimming problem from having too low of amperage ALT. The problem with that is that those batterys are like $175 (usually it's just cheaper to upgrade the ALT. unless there is not an upgrade available).I am sure that your audio setup does sound good...you ARE running some good components. I do like Orion audio(though I'm a Coustic audio man myself!)

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12-21-2008, 01:45 PM

the headlights don't dim the interior lights do but not enough to be really noticable unless you really pay attention to it. I'm not running any caps and i have got a interstate battery i really need to get one box for my 2 10's(right now i'm stuck with two boxes) and i really wanna upgrade everything to alpine (type s 10's and mono block amp)

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(#18)

yamahlr
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75 Amp alt. -

12-28-2008, 11:43 PM

Anyone done a similar swap for an increase in the 2.6 motor?

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jecr
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12-29-2008, 07:40 PM

Quote:

Originally Posted by yamahlr

Anyone done a similar swap for an increase in the 2.6 motor?

use a starion/conquest alternator, its 65-70 amps

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(#20)

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Alt upgrade -

12-29-2008, 09:43 PM

Forums like this are the best! Eliminates so much trial and error!

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