George Lendich wrote:

Paul,
Just had some feed back on Turbo selection and was advised that the TO4E-50 is a good selection for power, however the housings A R are .6 for the compressor inlet and .96 for exhaust inlet ( less
than the 1.3 previously advised).
However that would run a fairly high boost and would be too high for just normalising ( N.A rotors) unless a wastegate is used.

My contact uses Mazda components which has the cost advantage - he uses a 13B compressor with a 12 A turbo which spins-up more quickly and provides more power sooner.

I advised him of our problem and he suggests that what we need is the opposite to what he uses and that is a 12 A compressor with a 13 B Turbo.

Their interchangeable apparently!
These are only suggestions of someone to try and it's either this or the more expensive aftermarket set-ups.

I'm not using a turbo but would personally try the 12A compressor with the 13 B turbo myself if cost was a consideration.

Just some feed back to consider, hope it helps.
George (down under)

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