I am looking at which turbo to get and want to find out which one will work best at 18/19psi on a standard 2L, I have standard internals and after the turbo and intercooler i will not modify for power any further. Does anyone know which turbo will suit best or can give me some help reading the maps...what does the pressure ratio on the y axis represent...how do i find out how the cfm relates to boost?

I think each one of the loops on the map represents a different boost pressure. Don't quite understand them, though havent tried too hard..

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K.E.R.S!!!1

is this going to be on a stock or aftermarket ECU ?

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MY93 Impreza GX 1.8L, 0hp, 0nm

My car has an aftermarket ecu if thats what your asking.
The loops/islands on the map relate to different efficiencies (60%, 75% etc) but i cant work out what the pressure on the y axis relates too and how boost relates to the cfm.

I think your best off looking at what has worked very well on other cars. I would say PE1818 or the GTS01 from GT pumps would be your best bet.

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PE1818?

I dunno where you got your results from Simon, but every car I've seen with a PE underperforms compared to VF series turbos..

On a standard 2L engine running 18/19psi you'd be hard pressed to look past a VF34 especially considering the price of the more 'exotic' turbos.

I was thinking a VF34 but just wanted to do a little research for myself rather than just be led by what everone has done before, i suppose it's like free R&D what with all the people who have modded before...