Racecar alternators

[testorossa1989]

So my car is eating PA performance alternators like it's a job. I only get 3k out of them now. I'm looking at J2 fabrication 200amp alternators.

What's everyone using past 550hp for alternators and is J2 any good. I've gone through 2 PA performance alternators already

Sent from my SM-G930V using Tapatalk

 

[roy_1031]

I think it has to do more with pulley combos and alternator RPMs versus horsepower. I had mine rebuilt to 170A and added a 3.5” alternator pulley to slow it down and I haven’t had a problem since.


Sent from my iPhone using Tapatalk Pro

 

[Ryan2KRedL]

I feel your pain!
I had my stock alternator upgraded internally to a 200amp last year and it gave me multiple problems and broke 3 times (internal solder problem, then some winding touched side of case and was overcharging, then regulator went out).
So I just installed a Nations alternator and so far so good.
https://www.nationsstarteralternator.com/200-Amp-High-Output-Alternator-p/8304-200mf-er.htm

 

[jwcobra03]

Been having my Nations for almost 2yrs. Has about 10k miles on it. Still charging at 14.3-14.7. Set it that way when i first got it. External regulator is nice to adjust the voltage.

 

[testorossa1989]

I think it has to do more with pulley combos and alternator RPMs versus horsepower. I had mine rebuilt to 170A and added a 3.5” alternator pulley to slow it down and I haven’t had a problem since.


Sent from my iPhone using Tapatalk Pro

I think I may go to a 3.70 since I haven't touched my crank cage. Any chance at alternator pulley increase size would change my boost? I don't feel like losing power over this haha I'm at 3.50 now

Sent from my SM-G930V using Tapatalk

 

[Mpoitrast87]

I have a billtech 170amp. 3 years at least and still going. volts sit at 13.8-14.2

 

[testorossa1989]

I have a billtech 170amp. 3 years at least and still going. volts sit at 13.8-14.2

Whatcha running?

Sent from my SM-G930V using Tapatalk

 

[Black02GT]

I think I may go to a 3.70 since I haven't touched my crank cage. Any chance at alternator pulley increase size would change my boost? I don't feel like losing power over this haha I'm at 3.50 now

Sent from my SM-G930V using Tapatalk

Doubt it, the only thing that effects boost is the ratio between the blower and crank pulley. I just picked up a J2 since my stock one was dropping under 12V around and above 7K rpm. Haven't got it in yet though.

 

[testorossa1989]

Doubt it, the only thing that effects boost is the ratio between the blower and crank pulley. I just picked up a J2 since my stock one was dropping under 12V around and above 7K rpm. Haven't got it in yet though.

That's what I got. But I think I'm gonna change the pulley now just as a precaution

Sent from my SM-G930V using Tapatalk

 

[testorossa1989]

.

Sent from my SM-G930V using Tapatalk

 

[Black02GT]

. View attachment 1483532

Sent from my SM-G930V using Tapatalk

It's a nice piece. To be honest I would have went at least #1/0 on the wire for shits and giggles, but the supplied isn't bad.