h/a no idle amps the norm?

[Xjeff 10+ year member]

Hello I was recently quoted for a high out put alt for my 2006 dodge stratus, the makers of the alt which I'll keep out claims that after I go with a larger than 200amp alt I will no longer get idle amp but will get more amps at about the 2500 rpm range and higher. Is this common in small hairpin alts? Another thing is my normal commute is only 2 miles long and top speed of 30 mph, in which case my max rpm is only about 2000, will I end up killing my battery from not being charged while I listen to music?

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[Massive spl]

No hairpins are great at idle. Call excessive amperage up for an alt

 

[Xjeff 10+ year member]

Can't put anything bigger in my car without modifing the alt location and I don't want to do that.

 

[Massive spl]

They can use same size case and build you something

 

[Xjeff 10+ year member]

I've talked to them and they quoted me the same price fornthebsame alt. And claimed the same thing. Seems like like screwed either way huh? No alt and I have flickering lights, bigger alt and I'll have to on extra drives everyday to charge my battery, hmm.

 

[els1989]

No hairpins are great at idle. Call excessive amperage up for an alt

??? Mechman 370a elite for my gmc is a hairpin alt and it does 247 at idle....

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[Xjeff 10+ year member]

Talked to them as well and said they won't make a alt for my car.

 

[Xjeff 10+ year member]

This is what I was told. "Small Case Hairpin Line

- 140A HOT "160A", 90A HOT @ idle, 110A COLD @ idle, 120A HOT @ 2500 Alternator RPM - $325

- 160A HOT "180A", 110A HOT @ idle, 125A COLD @ idle, 140A HOT @ 2500 Alternator RPM - $350

- 200A HOT "210A", 100A HOT @ idle, 130A COLD @ idle, 120A HOT @ 2500 Alternator RPM - $450

- 240A HOT "250A", 55A HOT @ idle, 70A COLD @ idle, 140A HOT @ 2500 Alternator RPM - $499

- 270A HOT "280A", 0A HOT @ idle, 0A COLD @ idle, 100A HOT @ 2500 Alternator RPM - $599

- 320A HOT "330A", 0A HOT @ idle, 0A COLD @ idle, 140A HOT @ 2500 Alternator RPM - $649"

 

[Jeffdachef 5,000+ posts]

Either tell them to do a voltage regulator mod to put out power at all times or modify your vehicle to higher idle rpm. My alt doesnt charge at 600 rpm but starts kicking off at 800-900. Its a singer alt, no drop when it actually gets 1k to 1.2k rpm

 

[els1989]

Did you talk to DC power

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[adulbrich 5,000+ posts]

High-output alternators in small cases have limited output at low RPM. My 320 amp small-case puts out next to nothing at idle, lol.

I just ordered a 300 amp Excessive Amperage alt to replace the $40 stock one I used to fill the 4th place on my quad bracket

 

[ObTechAudio]

Hello I was recently quoted for a high out put alt for my 2006 dodge stratus, the makers of the alt which I'll keep out claims that after I go with a larger than 200amp alt I will no longer get idle amp but will get more amps at about the 2500 rpm range and higher. Is this common in small hairpin alts? Another thing is my normal commute is only 2 miles long and top speed of 30 mph, in which case my max rpm is only about 2000, will I end up killing my battery from not being charged while I listen to music?

Unfortunately, that is the truth - especially with small case hairpins. I'd hope any reputable company would agree. Please see the chart below. Small case hairpins significantly lack in low-end output. Large case high amperage (370s, 390s, etc) also share similar characteristics, just not as bad. Large case 240s, 250s, 270s will have the best idle output. Please keep in mind that alt rpm is roughly 3x engine rpm (1800 alt rpm = 600 engine rpm)

 

[ObTechAudio]

Either tell them to do a voltage regulator mod to put out power at all times or modify your vehicle to higher idle rpm. My alt doesnt charge at 600 rpm but starts kicking off at 800-900. Its a singer alt, no drop when it actually gets 1k to 1.2k rpm

What do you mean voltage regulator mod? A device to excite the alt into spitting out 14.8v or a device to send the computer a false load thus making the alt spit out max amperage?

 

[xr650jkallen]

What about a overdrive pulley?

 

[ObTechAudio]

What about a overdrive pulley?

It can help.