upgrade alternator from 90 to 150amp

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charger440neon2.0l
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upgrade alternator from 90 to 150amp

Post by charger440neon2.0l » Wed Jul 14, 2010 1:30 am

so the alternator died in my neon today. It had a long life 320,800 miles. it was the original to the car and served it well. Ever since I got the car I always had all the lights dim and the blower motor would sound like it lost power at idle. my autometer gauge would drop to 12.7v and once I got to about 1300rpm it would always be right back on 14v. I'm sure my udp didn't help out much.

So my question is will an srt-4 alternator fit my 2.0l sohc. I know I'll have to change the regulator plug but physically will it fit? It looks like it would from online pictures, it has a four groove serpentine belt. And it produces 150 AMPS compared to the stock 90 Amps

charger440neon2.0l
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Post by charger440neon2.0l » Wed Jul 14, 2010 2:11 am


Echoalpha23
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Post by Echoalpha23 » Wed Jul 14, 2010 2:23 am

if you are running an UD pulley then your alternator will never put out the rated power! have you thought about using an OVERDRIVE pulley n a stock replacement alternator first??

charger440neon2.0l
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Post by charger440neon2.0l » Thu Jul 15, 2010 5:35 pm

I could overdrive it but then I'd also have to buy an overdrive pully, and I did a little search and the only ones I came up with are alternator only with no power steering or a/c pully on them. I figured I may as well have upgraded it since I was buying one anyway, but I just got a reman stocker. The car always has dropped volts with the stock pcm, stock pully, and everything else stock, So I figure it wont hurt to go on forever like that. but if anyone knows if it will fit then that would be a great upgrade.

racer12306
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Post by racer12306 » Thu Jul 15, 2010 7:17 pm

Echoalpha23 wrote:if you are running an UD pulley then your alternator will never put out the rated power! have you thought about using an OVERDRIVE pulley n a stock replacement alternator first??
Please explain. Alternators do not have their max output at engine redline rpm. It just moves the output to a slightly higher engine rpm.
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Echoalpha23
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Post by Echoalpha23 » Fri Jul 16, 2010 3:06 am

never said anything about max power, just the alternators rated output...
if the alternator is spinning slower then itll have a lower output!

charger440neon2.0l
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Post by charger440neon2.0l » Sat Jul 17, 2010 4:34 pm

An alternator has a power curve like your engine. The factory replacement I got is rated at 90amp it came with a performance slip,

out put tested at 13.20V
Rpm is alternator rpm not engine rpm.
57A@1800RPM
70@2000RPM
105A@3000RPM
117A@4000RPM
123A@5000RPM
126A@6000RPM

Now a higher rated amp alternator would have a similar curve but it would start higher equaling more amps at a lower rpm. I had some time on my hands and since I did not put the splash shield back on yet I counted my alt rpm, it is 1.6RPM more than crank rpm so at idle 975-980 my alternator is spinning 1,560RPM
My stereo pulls 15A, PCM/ignition 7.5a, fuel pump 18a, hids while continuously on 4 ballasts 16a, a/c 21a for a total of 77.5amps at idle

charger440neon2.0l
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Post by charger440neon2.0l » Sat Jul 17, 2010 4:36 pm

oh and stock is 1.8 alternator over engine rpm

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BIGRAM
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Post by BIGRAM » Mon Aug 09, 2010 1:07 am

Now my brother was runnin a 2.4 alt on his car just the belts kept slippin off cause they don't line up properly.
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