Having a new turbo built up (stage 3 you might say) and was considering going 60 trim on the compressor wheel instead of 55, previously running a 50 trim.
How will this effect the turbo's response/performance and will the turbine housing/wheel become restrictive at all? Obviously it will mean more lb/min of flow in at any given turbo RPM but what other benefits/draw backs are there?

I'm on stock manifolds but with a NMS ported head (stock valve sizes), the off the shelf Newman RST cam and slightly higher than stock CR, still a 1600cc.

All thoughts and input welcome!

Compressor maps...





Can't seem to find a 55 trim comp map yet....

Cam spec...

 

Also been given the option of a T34 turbine wheel in the RST .48 housing, which i'm told is the same size as the RST wheel so won't increase lag.

Any thought's experiences please...

 

Did any one ever shed any light on this Karlos? be interesting for some one who knows their stuff to compare the comp maps above with a gt2560.



How does compare with a .50-.60 trim t3 with a .48 exhaust housing?

 

Are flow figures so similar because they are both 60trim? the gt2560 seems to be much more efficient? Sorry, i really am blond when it comes to turbo specs...

Am i being a right tool, are the two maps virtually identical?

Rob,