Was up guys, thought I’d give this a try and see if anyone out here can help.. so I got a boosted H22a fully built with a 61mm bb turbo and 1200cc rc injectors.
its in a 94 integra Gsr chassis, battery is relocated to the trunk ( I bought shell this way) .my issue is for starters when I crank the car I get a very week crank every single time almost as if the battery where damn near dead or dead , I have to let go of the key and turn it again almost always the second time I get better crank and car starts.first I thought I had a bad battery so I replaced and it was the same, then time for tuning came and on the Dyno the alternator took a dump ( was a new alternator) I since swapped out the turbo and upgraded to 1200cc injectors yes with a resistor box. When to re-tune and my voltage issue was also now under WOT after vtec engages. The voltages start dropping from 13.9 or so down all the way till around 12.0 or so. Every single time at WOT after vtec engages .my tuner said I have to fix this issue as he can’t tune because it starts misfiring like crazy when the voltage starts to drop every run. Relocated my battery ground , sanded surfaces made sure everything is tight my battery cables are pretty big 2 gauge I believe. Battery and alternator are both new and same issue.. If anyone can help I’d appreciate it thanks

 

Did you ever figure this out? I’m having the same issue… vtec hits and it goes from 14.1-12.5 and feels like I’m dragging a bus

 

it's a 2 year old thread, but here is the answer.
Run a ground cable from the engine directly to negative post on the battery. 2 gauge is small for your power I run 2/0 on my cars with battery in the trunk and a 6 gauge black back to the battery. Also run a good ground from the engine to the chassis. And battery to chassis
The chassis is actually not a good grounding conductor for the motor. Electrons run on the surface of metal not inside, so think of all the crap on their way home (battery) that covers the bare metal chassis.