TUrbo Sizing rule of tumb for rotaries

[leeroy_25]

Okay.. So quick little puzzle!
If I had a 6 cylinder piston engine to make 450bhp and was us turbo x
I presume due to the extra gas flow on a rotary engine to make 450bhp I would have to uses X\'s big brother? Now would that be the same compressor size with a 1 size increase on the turbine A/R roughly?
Another way of looking at it maybe is if I have a turbo making 600bhp on a piston engine could I assume I am likely to max that out at say 400bhp on a rotary?
Now if I add another rotor into the equation how much does that impact it?

I am trying to size the turbo for my 20B! But not wanting to go the normal Garret/HKS route.. I am just torn between two sizes on the exhaust as I want to maximise spool without choking it top end or ending up with High EGT\'s

Any thoughts on the matter would be appreciated!

Cheers
Lee

[Turblown]

It would be best to tell us which brand turbo you are looking at...

GT4294R with a 1.0 housings is what you are after from Garrett.. A Q trim 1.15 with a 67mm wheel, and open 60mm wastegate with 4" exhaust would work too