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Anyone install a high-output alternator in their Z?

I heard or read somewhere that the Z has some kind of special system which regulates alternator output to demand, and that it was possible an aftermarket alternator could be

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Old 05-16-2019, 09:23 PM   #1 (permalink)
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Default Anyone install a high-output alternator in their Z?

I heard or read somewhere that the Z has some kind of special system which regulates alternator output to demand, and that it was possible an aftermarket alternator could be problematic. I'm wondering if any of you guys have actually put one in, and what the results were? Mine's a 2009 Sport, BTW...

I know this car has a pretty robust stock alt, I get that. But I have 3 alternators on my Tahoe. Actually I have gone so far as to separate my stock electrical and stereo electrical on the Tahoe. So one alt is actually just a placeholder on my 3-alt bracket, one is a stock 145A to run the truck, and the last is an Ohio Generator 300A charging just the 2nd battery and running my system.

So due to lack of space in the engine bay of the Z, I am hoping to replace the stock alt with a high-output version, something over 250A, I hope. I have emailed OhioGen, but it's been a day or two and haven't heard back from Tom Eliopoulos yet. Was just wondering if anyone had done this, or is everyone pretty well sticking with the stock alt?

Just for reference, I have a Sundown SAZ-3500d (v1) and a pair of Zapco DC 750.2 amps, for a total of about 4200 watts available. Not really anywhere to put a second battery unless I put it in the hatch, which I'm not hot on right now, but I'll probably put an Odyssey Extreme Group 35 under the hood, as that's what I have in my truck. Seriously good AGM batteries.

Would love more information on the regulation of the electrical system, if anyone has it - I went with a self-exciting alt for the system in my Tahoe - after several years of trying to get my triple-alt system to run properly by the alternator control module I bought, going through a ton of batteries, I decided to go simple and separate things.

So... any specific info along these lines?

Last edited by tRidiot; 05-18-2019 at 02:42 PM.
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Old 05-17-2019, 06:49 AM   #2 (permalink)
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Quote:
Originally Posted by SouthArk370Z View Post
According to CHG-27 of the 2009 FSM:
Hot output current (A/rpm)
More than 31/1,300
More than 122/2,500
More than 144/5,000

Regulated output voltage (V)
14.1 - 14.7
---

Assuming 14.5V, the alternator can put out between 450W and 2100W (give or take a few Watts).
I don't think anyone has exceeded the stock alternator, if they did it was a custom job and really didn't include details.
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Old 05-17-2019, 06:53 AM   #3 (permalink)
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I've done some serious setups but I think you'rs IMO is a bit crazy for a sports car. You will have to upgrade the ALT if you're truly going to push that kind of power RMS, along with possibly a second batter.
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Old 05-17-2019, 07:18 AM   #4 (permalink)
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Adding a second battery in the hatch is not difficult. A number of people have relocated theirs to the hatch.

DIY: Battery Relo
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Old 05-17-2019, 07:44 AM   #5 (permalink)
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I've done some semi-serious system installs before. If you've already run multi-alternator systems we can assume you know what you're doing. I'm just curious how you plan to find room for all that gear. Will you be competing with the Z?
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Old 05-17-2019, 07:12 PM   #6 (permalink)
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The gear is already installed. I removed the spare tire and built in a fiberglass enclosure for 2 12s. Near as I can figure, it is just about 3.5 cubic feet. Here's a look:

Previous install:




New install:




The gallery:

https://trdoc21.smugmug.com/370z-stereo-install/


Yes, we have spent a shiteload of time and money on the Tahoe and have rebuilt things multiple times. No intentions of going THAT big with the Z (Tahoe has around 7400 watts), but I've done essentially everything I can with the Z except rebuilding the electrical - and I figure it's time. Might as well, right? I nearly put horns in there, but there just wouldn't be room for my legs, lol.

As for competing, no, not likely. I like to tune my stuff for everyday listening, how *I* like to listen - not some SQ judge's taste. I always found the IASCA-style sound to be fairly wimpy. I believe in "overbuilding"... here's a glimpse under the hood of my Tahoe:

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Old 05-17-2019, 07:16 PM   #7 (permalink)
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BTW, if you look at the build gallery of the Z I posted, you can see, the hatch is pretty well occupied, so I don't want to put another battery in there. I COULD, yes... but I feel it would have to be up top, and would be intrusive and would be a detriment to the "lines" of the install. I don't think I really have room down below for it, after building in that box.

So I just thought I'd check in and see if anyone else had put in a high-output alt. While 150A from the factory is pretty nice for a little car like this one, it's just not quite enough for me. I am getting some voltage drop, and I don't care for it.
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