Boosted H22 voltage dropping at WOTWas 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

 

brand of alternator and battery?

 

Do some research and make sure the electrical load detector is operating correctly.

 

99% of the time it's the alternator, or more specifically the voltage regulator. They get extremely hot from being right next to a turbo manifold and the internal solder melts causing exactly the issue you describe. It's pretty common on turbo H/F series stuff since the alternator is literally right next to the hottest part of the car. I've gotten so I just throw a new voltage regulator in mine whenever it starts having issues. Replace brushes as needed. Saves a lot of money.