For injector rebuild, I would suggest upping the pop pressure. Stock pressure is 2200 to 2300psi (not exactly but in that area). When I rebuilt mine, I upped the pressure to between 2400 and 2450psi (around 160 bar). You don't want to go too high, but a little higher will help fuel atomization. Higher pressure also retards timing slightly, so you may want to compensate by advancing the timing a little more.
Jason
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