supporting a vfl 200.1 @ .5 ohm?

[Lil Poot 5,000+ posts]

right now i have 2 yellow tops, a 31 series in the rear and a 34 up front with an iraggi 240a alt charging them. however, i'm still getting voltage drops to 11.3 (lowest i've seen, usually its around 11.5)

that is at idle, i havent measured it while i'm driving and fords lousy instrument panels dont show numbers, but it's slightly higher, i'd guess low 12's while driving at full tilt.

whats the first step to getting that back up there, maybe dual 1/0 runs for my big 3, dual runs connecting the battery in the rear to the front, more powerful batteries, or will i have to bite the bullet and get a bigger alt?

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[TheFiverMan 10+ year member]

anything under 12 isnt good...

 

[Lil Poot 5,000+ posts]

i know thats why i'm asking.

 

[spin dB 10+ year member]

If you haven't yet do a big three with 1/0 or bigger, if you have then consider running another run or upgrade to 2/0 awg. IF you haven't yet run 1 run of 1/0 awg to the rear battery power and ground. IF you have then run another run both power and ground.

With that said if you have done these things then I would consider increasing the battery in the back to a Kinetik HC 2400 and if you can fit it a Kinetik HC 1400 or 1800 under the hood. These are far more powerful than the optimas that you are currently running. IF you have a true 240 amp alt then you should not have as big a problem as you are having. What are you getting out of the alt at idle? then test it at 2000 RPM's, this will give you an idea of what it is when you are driving. If you are getting only a 11.3V at the lowest and averaging an 11.5V for dip at idle then you really don't have a problem. Stereos rutinely dip and peak. Anything under 10V at idle and 11.5 at 2000 RPM's is the danger zone. I won't worry if you have 11.5V at idle, odds are that you have 12v-12.4V at 2000 RPM's.