Alternator Options
 

For those of us running or looking to run massive amperage drawing systems, what alternator options are you considering?

I haven't seen any increased amperage alternators for the FR-S/BRZ/GT86.

Does anyone have a link to the stock max alternator output?

Some considerations:

Smaller diameter pulley on the alternator
Dual alternator installation
Replace with higher output ALT.
Any other suggestions?

i looked here for Scion TC alternators might be the same size. but i havent really considered buying one. im sure someone could chime in about whether it would work or not.

https://www.dcpowerinc.com/high-outp...2.4L+I4+2AZ-FE

Maybe look at Subaru replacement alternators, since it is a Subie engine.

Thank you FreshFRS and kmbkk!

I'm considering the second alternator setup. I'll have to look around in the engine bay to see where I could weld up a second alternator bracket. I'll post pictures later (likely Saturday) with the proposed spot for scrutiny and commentary.

http://powerbastards.com/proddetail....od=Fitzall-220
^ any opinions on this brand?

So apparently none of you looked at the alternator before asking this???


It says on the label of the alternator that it is a 130A alternator.

please be mindful that this car already has a significant load due to the 90-100V required to open the DI against upwards of 200 BAR fuel rail pressure.....

I own an Asphalt FR-S but yes, have not had a chance to look at the alternator due to workload. I was assuming it would be similar to most modern passenger cars, in the 90-110 range. 130 is surprising but you are saying the systems require this amperage? It is assumed the manufacturer will install an alternator that can run all the systems of the car simultaneously and then some, but not an excessive amount more. This is why almost always, for a big system build the alternator will need to be upgraded or supported to mitigate headlight dimming and reduced battery/alternator lifespan.

The system I am putting into this car crashed my alternator on my first build. Installed a high output, but still had headlight dimming issues, so I'm looking for advice and I will have a DIY for whatever I do to be informative for others with this vehicle wishing to install heavy draining audio systems or additional electronics.

So, this thread is about what is the best choice for this car (based on availability, cost, ease of use, effectiveness)

Curious as well

Mike Singer Alternators is able to make a 275a stock alternator replacement.

Since I've used DC Power alternators before, they were my first choice. Here's the response I got from them:

Has anyone successfully installed the Mike Singer alternator or any others for that matter?

I've had good experience with Excessive Amperage, Nations Auto Electric, Mechman, and others. I've contacted Nations, but awaiting a response.

How much more engine power does it take to run it, though? I doubt you can get that much additional amperage just by upping the alternator efficiency, and there's always TANSTAAFL to consider. That extra electrical power has to come from somewhere, after all.

Just got the Mike Singer 275A alternator last night, by hand it didn't feel all that much more difficult to spin. I see what you are saying. I'll have to ask how it's done.

Are we concerned about massive sub draw? I thought same some decent D10 charge caps do the trick I've tested a 5.1k audison with two 10" no issues or dimming etc when car was running... Unless you're going all out like a stereo comp set and don't want to run caps I don't see the need. (For now) anyhow.

Maybe higher spin rate, & improved efficiency?

On phone I am. Therefore, if mistakes I make, Frank Oz blame you should.

Definitely has a higher spin rate. The pulley is somewhere near half the diameter.

I opted for the externally regulated version, so I have quite a bit more install work to do prior to having the Singer alternator operating. I hooked up the stock alt to an ammeter see what it's current output was at idle right after cranking. 30 amps.

Yeah, idle. Run the revs up.

On phone I am. Therefore, if mistakes I make, Frank Oz blame you should.

Just got word back from Nations Auto Electric:

Is there anyone in the Midwest that would be willing to volunteer for measurement and/or test fitting?

I'd gladly be the test mule for this one if this weren't my DD and only vehicle.

If there are spare alternators laying around, this would be a huge benefit to the community. I'm sure we could cover any round-trip shipping costs incurred.

DC Power are about the only high amp alternators I've seen that don't sacrifice low rpm (idle) amperage. All the others usually output lower idle amps than stock alts, so you only see the higher "rated" output at higher rpms

Can you please tell me your sound system setup if that is indeed the source of massive power draw? Trying to figure some audio stuff out as well.

Sent from my ONE A2005 using Tapatalk

I was running close to 3300watts. I used Singer but the alternator itself didn't seem to put out that much more power. I think a better custom solution would have been better. Maybe a larger truck alternator, but even with a custom case with mounts that will adapt to the frs motor would still require a new longer accessory drive belt.

So, you can get a little extra power from an upgraded alternator, but don't depend on it, even though you will need it. Combine it with larger/multiple batteries that are for audio and definitely run capacitors.

I don't have any experience with these cars, but I used to run 4 12's on 3,000 watts in an 01 Tahoe and later 4 12's on 10,000 watts, one 250a alternator is not enough. I had 2 320a alternators, everything wired with 1/0 ofc wiring, and a couple of these batteries NorthStar SMS-AGM480's. Buuuuuut, with all that said, 3,300 watts seems like way too much for how small this car is. I was looking at max like 800 watts to go in my wife's 86.