Acceptable voltage loss

[KTMrida4life 10+ year member]

So I bought one of the volt meters that plugs into your cigarette lighter and Im not sure if its totally 100% accurate but it seems to be so far.

With my current setup listed in my sig, 2 10" kenwood subs, Kenwood 8105d amp (500W rms @ 2 ohms) and a Kenwood 8405 amp all on a 150A alt + a brand new stock battery Im getting about .4V voltage drop max. Goes from 14.0V down to 13.6V, lowest I ever saw it go.

I'm pretty sure thats OK, but my main concern is once I put in my new setup tomorrow hopefully.. lanzar opti 2000D amp (1700W~ RMS @ .67 ohms) , so what is the most voltage drop I can have that is still considered acceptable? I dont want to fry anything. Im doing big 3 upgrade with 1/0 soon as I havent done that yet.. which probably isnt helping.

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[mast240 10+ year member]

i wouldn't run that setup on stock alt and stock batt.... you're going to easily see voltage in the 11's, and that could easily make the magic blue smoke appear. at a MINIMUM, i would replace the stock batt, and upgrade to big 3, and then worry about your voltage drop.

also, i wouldnt consider wiring the amp down to .67, until you get some good electrical going on... it'll be a pretty big power hog at that impedance, and running that low can be very dangerous without proper electrical to back it up

 

[KTMrida4life 10+ year member]

i wouldn't run that setup on stock alt and stock batt.... you're going to easily see voltage in the 11's, and that could easily make the magic blue smoke appear. at a MINIMUM, i would replace the stock batt, and upgrade to big 3, and then worry about your voltage drop.
also, i wouldnt consider wiring the amp down to .67, until you get some good electrical going on... it'll be a pretty big power hog at that impedance, and running that low can be very dangerous without proper electrical to back it up

Im sorry if I wasnt clear, Im not on the stock alt. Stock alt is 90A, mine is 150A. Battery is a Duralast Gold... stronger than stock, but not an AGM or anything real special.

 

[mast240 10+ year member]

you got your big 3 done?

 

[KTMrida4life 10+ year member]

you got your big 3 done?

Not yet. Which is probably causing some sort of bottleneck from HO alt to my battery.. doing it tomorrow hopefully.

Been waiting on ring terminals + a fuse holder from a dude on CACO for 3 weeks now. Its getting to be ridiculous... Ive literally had my sub box designed, I built it, carpeted it, received my subs, put them in, ordered sound deadener, got it in, all in the amount of time I have been waiting. Thats stoopid

 

[mast240 10+ year member]

putting in a HO alt without big three, you really wont see much improvement.... if you get your big 3 done, you'll see a huge improvement. If you want to run .67 on that amp, i would pick up a small secondary batt for the back, just to be sure... running them that low can be dangerous without proper electrical, so overkill is sometimes in order

 

[Fi_ 10+ year member]

Not yet. Which is probably causing some sort of bottleneck from HO alt to my battery.. doing it tomorrow hopefully.
Been waiting on ring terminals + a fuse holder from a dude on CACO for 3 weeks now. Its getting to be ridiculous... Ive literally had my sub box designed, I built it, carpeted it, received my subs, put them in, ordered sound deadener, got it in, all in the amount of time I have been waiting. Thats stoopid

You can easily runt that Opti2k @ .67 with your electrical just do the big III before you do it I doubt you'll drop into the 11's unless you sit there idle full tilting to 10 minutes. Just to try to keep RMS up while you're idle and don't full tilt unless you're driving maybe turn the gains down just a little bit.

My boy is running 2 SA-12's off an Opti2k @ .5 ohm with stock battery and 60a alternator with no big III and 4ga wiring and so far he hasnt seen much time in the 11's mostly stays about 11.5-12v which isnt bad for completely stock low end electrical, this guy should be fine if he can keep it 12.5-13v.

 

[mast240 10+ year member]

You can easily runt that Opti2k @ .67 with your electrical just do the big III before you do it I doubt you'll drop into the 11's unless you sit there idle full tilting to 10 minutes. Just to try to keep RMS up while you're idle and don't full tilt unless you're driving maybe turn the gains down just a little bit.
My boy is running 2 SA-12's off an Opti2k @ .5 ohm with stock battery and 60a alternator with no big III and 4ga wiring and so far he hasnt seen much time in the 11's mostly stays about 11.5-12v which isnt bad for completely stock low end electrical, this guy should be fine if he can keep it 12.5-13v.

Please, don't listen to this guy

 

[thevic24 5,000+ posts]

Each install will be somewhat different but just to give you an idea..

I am now running both of my BRZ2100.1d's and ZXi 200.2. (was running just 1 of the 2100's for a while)

Each amp running 1 coil on a single sub. With box rise, each amp sees about 2.2 ohms with a 45hz tone.

My voltage at idle is 14.6(900 rmp) and on a full on burp it drops down to about 12.9v.

I am running 3 red tops. I actually built my own alt. I used my stock case and was able to get around 145a out of it safely.(was 100 stock)

The thing is, is I am able to get about 120-135 of that at 1100 rpm.

Now things are different at night with the light and a/c on but I thing you should be ok. I would add a 2nd battery if you can.

 

[sacsking916 5,000+ posts]

You can easily runt that Opti2k @ .67 with your electrical just do the big III before you do it I doubt you'll drop into the 11's unless you sit there idle full tilting to 10 minutes. Just to try to keep RMS up while you're idle and don't full tilt unless you're driving maybe turn the gains down just a little bit.
My boy is running 2 SA-12's off an Opti2k @ .5 ohm with stock battery and 60a alternator with no big III and 4ga wiring and so far he hasnt seen much time in the 11's mostly stays about 11.5-12v which isnt bad for completely stock low end electrical, this guy should be fine if he can keep it 12.5-13v.

05trailblazers alter ego maybe? You're an idiot man. Don't post again, just read.

OP 150a alt isn't really considered ho by many people. With that said big 3 a better battery than a duralast gold. Also look into another small battery. Low ohm loads like that pull some power.

 

[Fi_ 10+ year member]

Please, don't listen to this guy

Why not listen to me this guy what have I done? I'm just saying anyone with half a knowhow can run that amplifier @ .5 ohms with a somewhat decent electrical. Like I said if he has to he can turn the gain down a little. Hell I use to run an AP1500.1D @ .5 ohm off stock electrical well not me but my friends setup I did for him. Everyones so scared of .5 ohms.

 

[Fi_ 10+ year member]

05trailblazers alter ego maybe? You're an idiot man. Don't post again, just read.
OP 150a alt isn't really considered ho by many people. With that said big 3 a better battery than a duralast gold. Also look into another small battery. Low ohm loads like that pull some power.

Nah I'm all set if I didnt post there would be so much missinformation around this board. and yeah that 150a isn't doing what a normal 150a is doing for power but it's still better than a stock 90a. Why do you think I told him to give it RPMS while idling? Funny how you call me an idiot when I could show you this setup running daily lol.

 

[Fi_ 10+ year member]

Each install will be somewhat different but just to give you an idea..
I am now running both of my BRZ2100.1d's and ZXi 200.2. (was running just 1 of the 2100's for a while)

Each amp running 1 coil on a single sub. With box rise, each amp sees about 2.2 ohms with a 45hz tone.

My voltage at idle is 14.6(900 rmp) and on a full on burp it drops down to about 12.9v.

I am running 3 red tops. I actually built my own alt. I used my stock case and was able to get around 145a out of it safely.(was 100 stock)

The thing is, is I am able to get about 120-135 of that at 1100 rpm.

Now things are different at night with the light and a/c on but I thing you should be ok. I would add a 2nd battery if you can.

I agree finish big III and add another battery you should be good to go. Don't be scared of it.

 

[Fi_ 10+ year member]

Each install will be somewhat different but just to give you an idea..
I am now running both of my BRZ2100.1d's and ZXi 200.2. (was running just 1 of the 2100's for a while)

Each amp running 1 coil on a single sub. With box rise, each amp sees about 2.2 ohms with a 45hz tone.

My voltage at idle is 14.6(900 rmp) and on a full on burp it drops down to about 12.9v.

I am running 3 red tops. I actually built my own alt. I used my stock case and was able to get around 145a out of it safely.(was 100 stock)

The thing is, is I am able to get about 120-135 of that at 1100 rpm.

Now things are different at night with the light and a/c on but I thing you should be ok. I would add a 2nd battery if you can.

I agree finish big III and add another battery you should be good to go. Don't be scared of it.

 

[mast240 10+ year member]

Nah I'm all set if I didnt post there would be so much missinformation around this board. and yeah that 150a isn't doing what a normal 150a is doing for power but it's still better than a stock 90a. Why do you think I told him to give it RPMS while idling? Funny how you call me an idiot when I could show you this setup running daily lol.

your the one giving out misinformation... please, just stop