Has anyone here ever increased the plunger size in the injector pump on either a 4jb1 or 4jg2? What gains did you see as opposed to costs of doing so. I am weighing up if i want to build up my 4jb1 or my 4jg2, or just stick my 3.8 vs commodore motor in. The cost of my adapter plate is going to be just short of 1000$ plus all the rest i'm considering a new turbo (Either machined housing with vf8 or just vf10, or a garrett b/b turbo) and a worked injector pump.
Will obviously have all custom intake and exhaust to suit though.
Cheers