Ummm, good luck with this.
I know that Suzuki's 1.6 and 1.8 engine are good little engines but I've never heard of anyone putting a turbo on them, hopefully you start out with the boost pressure low and work your way up or you may find pieces of the pistons and connecting rods sitting in the oil pan.
But to answer your question I don't know what fuel injectors you are going to need but what you are going to need is to keep the air/fuel mixture where it needs to be, if you run too lean the engine will run hot and possibly melt the valves or pistons and/or both.
Also if your combustion temperatures exceed 2,500 degrees oxygen and nitrogen will fuse together and form NOX which will cause the "Check Engine" light to come on and you will fail emissions testing next time your car is due to be tested.
If you run too rich you may end up with gasoline in the oil (not a good thing) and you will blow black smoke out the tail pipe and eventually plug up your cat with carbon.
What you are going to have to do is experiment with different injectors, fuel regulator pressures, and turbo boost pressures until you come up with something that the engine likes, what I would also do is talk to people that race imported cars (Toyotas, Hondas, etc.) at your local race track and see what worked for their 1.8 engines that will probably save you a lot of time, trouble and money.
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