Low idle voltage... High output alternator - Page 11 - Lightning Forum | LightningRodder.com
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post #151 of 179 (permalink) Old 03-31-2019, 04:14 PM
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Verified. It’s F798. The 8 looked like a 6 lol

Looks like they do not come with LRC.
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post #152 of 179 (permalink) Old 04-11-2019, 10:17 AM Thread Starter
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Little more progress on getting a second alternator crammed in there. Got all my measurements. Now on to the actual bracket design.
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post #153 of 179 (permalink) Old 04-11-2019, 04:19 PM Thread Starter
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Bracket 90% designed

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Last edited by Painless Autoworks; 04-11-2019 at 07:19 PM.
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post #154 of 179 (permalink) Old 04-11-2019, 07:47 PM
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Damn. Too bad it won’t clear the raptor fans .

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post #155 of 179 (permalink) Old 04-11-2019, 08:00 PM Thread Starter
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Damn. Too bad it wonít clear the raptor fans .
I agree. Unfortunately a 4g alternator won't even clear. I tried to design the bracket to work with raptor fans. Just not enough room...

Raptor fans are 5 3/8" off the timing cover. A 4g alternator is 5 1/8" back to end of shaft, then add the extra depth for the pulley. No room.

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post #156 of 179 (permalink) Old 04-11-2019, 09:32 PM
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Quote:
Originally Posted by Jeffv333 View Post
Damn. Too bad it wonít clear the raptor fans .
I donít give a flying fornication about what fans fit if this man can figure out a way to get more juice. I would finally be able to go back to my 465 pumps and perhaps put the fuses back in my amp so my speakers make sound come out
Perhaps I need a better battery
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post #157 of 179 (permalink) Old 04-11-2019, 10:29 PM
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Quote:
Originally Posted by Leeproctor83 View Post
I donít give a flying fornication about what fans fit if this man can figure out a way to get more juice. I would finally be able to go back to my 465 pumps and perhaps put the fuses back in my amp so my speakers make sound come out
Perhaps I need a better battery
I didnít mean it like that. Iím glad heís doing the bracket, I just wish it would fit with the raptor fans. Iíd hate to get flex-a-lite fans. Or go back to a stock clutch fan.

Get a motorcraft battery! Those things are better than any auto parts battery out there. I wouldnít be able to compare to an interstate battery though....maybe that is better.

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post #158 of 179 (permalink) Old 04-11-2019, 10:43 PM
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Quote:
Originally Posted by Jeffv333 View Post
I didnít mean it like that. Iím glad heís doing the bracket, I just wish it would fit with the raptor fans. Iíd hate to get flex-a-lite fans. Or go back to a stock clutch fan.

Get a motorcraft battery! Those things are better than any auto parts battery out there. I wouldnít be able to compare to an interstate battery though....maybe that is better.
I was planning on going to an interstate battery next.
Iíve had these flex e fans and FAL controller for like 10 years (70xxx miles) without issue.
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post #159 of 179 (permalink) Old 04-12-2019, 05:27 AM
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your one of the lucky ones if your FAL wiring lasted that long lol.

Although heck just seeing the exposed wires front and center would have driven me nuts before anything lol


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post #160 of 179 (permalink) Old 04-12-2019, 08:04 AM Thread Starter
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I can't fit a stock 4g in that location either. Body is too large in diameter and the body is more squared toward the pulley. It hits everything...

4g on the right

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post #161 of 179 (permalink) Old 04-12-2019, 11:05 AM
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We need to find a way to integrate one of the newer alternators in the new trucks. Advanced technology in them, more amperage. There’s gotta be a way!

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post #162 of 179 (permalink) Old 04-12-2019, 11:46 AM Thread Starter
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The 4g alternator is the thinnest out there. Only option is new guts in a 4g case. I don't see it happening from anyone due to low demand.

The lower intake (turkey pan) coolant crossover would need to be eliminated from the intake and plumbed externally to allow a deeper alternator design.

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Last edited by Painless Autoworks; 04-12-2019 at 05:18 PM.
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post #163 of 179 (permalink) Old 04-12-2019, 11:59 AM
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That won’t work, that would require modifying the turkey pan “belly” as well. Not to mention the midplate as well....that’s just too much work. Much easier to go back to fan clutch.

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post #164 of 179 (permalink) Old 04-12-2019, 12:31 PM Thread Starter
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So the way a dual alternator system "with a single battery" would work is like this...

Whichever alternator has a higher voltage set point will become the primary alternator.

--------

Example:
200 amp alternator supplying 14v
"vs"
100 amp alternator supplying 14.8v

The 100 amp would be the primary due to higher voltage set point by the regulator.

--------

Now under load the primary alternator will supply voltage. Once enough load has been placed on the system, the primary alternator voltage will begin to drop. Once this dropping voltage reaches the secondary alternator voltage set point, the secondary alternator will begin to supply voltage.

So basically, one alternator will be free wheeling until demand is needed. When alternators free wheel they have little rotational load on the drive belt system.

Stock 4g alternator will be wired factory. Second (denso) alternator will be a one-wire on/off design.

Pretty sure the Denso in this scenario will become the primary alternator as the stock 4g regulator has a set point of 14.4v.

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Last edited by Painless Autoworks; 04-24-2019 at 08:55 PM.
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post #165 of 179 (permalink) Old 04-16-2019, 09:22 PM Thread Starter
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I think this bracket is damn near 100%. It is now a 2 piece design to cut down on manufacturing costs.

Going to have it 3d printed to verify fitment.
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