you could be right. My first step in my turbo kit is to get a megasquirt and run it NA for a while to get some practice using it.
Everything sitting on my car in that picture is a complete Greddy kit for a Honda Prelude with a 2.0 I was able to score it for $200 cash from a kit who really needed the money more than he needed a faster Prelude.
There are a few guys on Miata Turbo running TD05's most of them have 1.8's because people like to swap out 1.6's. The 18G is the next step down from the 20g. Greddy kits use Mitsubishi turbo's but they are not the same as the turbo's Mitsubishi uses on their cars. A 1.6 Honda uses the 16G a 2.0 Honda uses the 18g. Most Honda guys running a 18G are using 370 cc injectors so I look at the fuel needs of a 18G and think it will probably be okay.
The compressor wheel is actually smaller than the T28 by 4-3 mm and the turbine wheel is only 3mm larger.
I'm dead set on using it if it doesn't spool quickly I may try a T25. I'm into the car for $998 with it running. I scored the turbo for $200, I will probably buy someones used MS2 when they upgrade to a MS3 I missed out on a local one for $450 earlier this year. The roll bar and butterfly brace are used and I scored them for $150! I still need to put some FM end links and a set of Raceland coilovers and then I will have a reasonably quick Miata for under $2000.
That is my goal.
Here is a Greddy turbo spec sheet
The 20G is only available as a TD06 and a bit bigger on the turbine wheel. I would not attempt a 20G on the 1.8 or 1.6.
TD06 20g
Compressor Wheel diameter: 52.6/68
Turbine wheel diameter : 55.3/65
