Hi all , could JCav please give us some idea on the affects of using smaller trim compressors on Garretts GT3582R turbocharger . I need to know if its possible to make a bit less overall power (airflow) but have the same transient response with a little less turbine inlet pressure . I was thinking of suggesting using an 82mm 50 trim BCCW18C compressor (from the GT4082R) or same family 82mm 52 trim compressor from the GT3782 .

Also it has been mentioned that a "GT3576R" would work well . The compressor map for the GT3076R looks better suited to me than the GT3582R but the maximum turbine flow (GT3076R) is probably lacking for a 3 litre six so the GT35 turbine and housing may help to achieve equal manifold pressures on both sides .

Thanks all , cheers from Adrian in Aus .