C5Natie

I was wondering if anyone here has done the big 3 electrical upgrade to help with the voltage and current draw of big fuel systems. I just finished installing the third Fuel pump that will come on off a 10# Hobbs switch. I also have dual spal fans and a eoc fan so I have a good amount of current draw. I ordered the big 3 kit from forum vendor SacCityCorvettes to log and see if the cars voltage stays steady when everything is at full tilt. I'll share my results but was wondering if anyone had tried it already.

ss4luck

I think all cars can benefit from the big 3, regardless of current draw but especially cars with big current draw. I went through the electrical on my car over winter and had some extra 1/0 laying around from my stereo build in my truck and threw some upgrades at the Z out of principal.

C5Natie

Well im seeing anywhere from 0.5 to over a 1 volt increase according the dtc battery gauge. Also logged the voltage on the dyno pulls and it was always steady and never dropped. I must say it was definitely worth the upgrade.

Turpid porpoise

I did something similar except instead of adding larger gauge wire to the oem setup, I replaced all oem wires to the starter, alt and battery and replaced with 1/0 or 4 awg. I have zero voltage drop at all times.

neverstop

my car ran noticeably better with a big guage wire from brett run from alternator to battery on the hot side. otherwise it has to be routed via the starter terminal and with headers that gets hot as heck. i have to say my car ran noticeably better with a billetech alternator too, my guess is because the coil dwell and fuel injectors are scaled according to alternator that improving that output helps the fuel and ignition system a tiny bit.

C5Natie

What year is your C5? I was getting non stop Charging System Fault messages by simply using a 145amp alternator off a 2004 C5. Had to go back to my stock Valeo 110amp unit.

neverstop

sorry, I'm actually on a c6 vette. I know some of the older billet tech alternators were throwing that code issue in c5 but I believe they worked it out. I'm with you that having strong alternator output is key on these cars, especially for supercharged where can have minor belt stuff or slip going on at WOT so I figured a stronger alternator was well worth the price to ensure my fuel system always getting full juice. my fan runs higher at idle too so car cools a little better. i got the 240 amp one. not cheap but worth it.