Haji

Alright, so I was wondering what you guys think about a Big three upgrade on this car to increase the current flow to my current system. I was going to do it in 1/0 gauge wire. For those of you who don't know, big 3 is an upgrade of
Battery negative to chassis
Battery Positive to Alternator (300A fused)
Engine Block to Ground.

Please chime in electrical gurus, I don't want to screw anything up in the car, I just want to improve electrical flow.

RedG37SNC

Don't do battery negative to chassis unless you want to run the alt full time, overcharge your battery and lower life and take the mileage hit, see: https://www.myg37.com/forums/2917296-post5.html

Haji

How many miles would be talking?
My Alt probably will run hard anyways due to the 2500 watt amp i'll be putting in.

g37mobbin

use Stinger Electronics | Welcome

use the battery stringer that i use on my DD i have a 2000 watt kicker amp + 400w 4 channel amp running to it...it's a 300 watt that is used before any of the power is used from the battery. my Question to you is what are you worried about the most?

RedG37SNC

Oh would that be cool if power consumption and MPG effect were actually reported. You have to figure they took the time to design it, Nissan apparently beleived it was worth it.

One other possible consideration since this isn't clearly documented is that while the lack of a PWM signal results in normal generation is there a higher setting possible that would be activated with higher current draw?

Redline37

iTrader: (2)

So, I read what you said, but know very little about the whole electric grounding system. I got lost where you say "By performing the power generation voltage variable control, the engine load due to the power generation of the alternator is reduced and fuel consumption is decreased." So does that mean that it is better to not run the negative to chassis ground? I have already had my grounding kit installed, so is there any benefit to disconnect that one grounding wire?

RedG37SNC

Those were quotes from the service manual. With the battery negative connected to chassis you're shorting the Battery Current Sensor and defeating the power generation voltage variable control system. The documented benefit is that it can help improve mileage, the other I'm suggesting as a possibility is that it could also better maintain a battery under heavy load.

EDIT: One other benefit is it prevents overcharging which can also lead to lowering battery life.

mw09g37

iTrader: (3)

hmmm if this is the case why does every grounding system (stillen included) ground to the battery if the system nissan built doesn't like it?

Modme

iTrader: (17)

That's definitely an interesting find. So in theory, it would be better to connect a thicker gauge wire from the battery to the voltage sensor and another wire from the other end of the voltage sensor to the chassis.

Modme

iTrader: (17)

Most likely because they dont even know about this feature. Most of the aftermarket products are carried over from previous generation cars. They assume that since it was beneficial in other cars, it must be good for our cars too.

RedG37SNC

One of two possibilities.. they either weren't aware of the system and grounding kit design consist of measuring wire lengths to key areas, or they felt the benefits of improved grounding out weighed the benefits of the PGVVC system. I kind suscribe to the first suggestion since bypassing this is not a good idea. Battery management systems aren't unique to Nissan, most if not all cars have them these days.

Which one is right, we'll I still have a 12 gauge wire from Neg to BCS to Chassis, and I have Nissans system in tact so I'm going with that and will just be sure to keep my little fella's contacts clean. The rest of the GK is fine and glad to have it.

Haji

I'm worried about voltage drop when the bass hits. The sundown amp I'm looking to get takes in 250A of current so I need to bolster my electrical.
But I'm really interested about the lack of increased ground from the battery to the chassis. Everyone usually upgrades this to increase current flow otther wise you are in essence running everything through 1 measly piece of 8-12 guage? I use that stuff for speaker wire.......

Tennessee

Sorry to bump an old thread, but I am in the very same boat as you. I'm about to drop 2 amps in my 08 G35 that will be about 2700w between the 2. I've always upgraded all my grounds to 1/0 in all my rides. I was going to upgrade my starter battery to a stinger and run another in the back. Has anyone had any issues with the alt not charging your bank of batts?

scarguy055

So, you did the grounding kit minus the wire from the battery negative terminal to ground?

Did you notice any improvement in audio or anything at all or was it just for peace of mind or aesthetics?