I would need to check your turbo spec again, but have dyno'd many m20's.
What I found is ~12psi on a 56mm compressor, t3, a/r of .48 is pretty much gonna make close or at 300whp/320wtq (think Super 60 stats). Increase the inducer approaching 62mm, that's going to bump up to ~400/400 at 12psi, but come in much later. Go in to a 6266 t4 and you can easily make an m20 go 500whp, but it boosts very late and you break stuff at that point. For 500whp you need high quality pistons, over-engineered rods, and hope you don't ever starve fuel or #6 piston rings lands will melt. Personal best on an m20 was 518whp/590wtq at 19psi on a custom 6267 t4 with a big housing. Took 5k to reach full boost, but tires would break loose at 130mph swapping gears.
For a road track car, this is way too unpredictable. Worse thing you can do is have boost surge mid corner and upset the car. Your pointy end will be facing oncoming traffic at a lot of corners.
What I found is ~12psi on a 56mm compressor, t3, a/r of .48 is pretty much gonna make close or at 300whp/320wtq (think Super 60 stats). Increase the inducer approaching 62mm, that's going to bump up to ~400/400 at 12psi, but come in much later. Go in to a 6266 t4 and you can easily make an m20 go 500whp, but it boosts very late and you break stuff at that point. For 500whp you need high quality pistons, over-engineered rods, and hope you don't ever starve fuel or #6 piston rings lands will melt. Personal best on an m20 was 518whp/590wtq at 19psi on a custom 6267 t4 with a big housing. Took 5k to reach full boost, but tires would break loose at 130mph swapping gears.
For a road track car, this is way too unpredictable. Worse thing you can do is have boost surge mid corner and upset the car. Your pointy end will be facing oncoming traffic at a lot of corners.
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