17-11-2012, 11:35 PM
Nahhh this is more LGV 
Just been spying compressor maps and trying to get my head around them. Make for interesting reading compared to a T2 at the same pressure ratio. T2's seem to drop out of peak efficiency just after a P/R of 1.8 (12psi, stock for a DT-ish), at 72%. By the time you hit a P/R of 2.5 (22psi) it's at peak flow but only 60% efficiency. Makes you wonder why people run T2's up at 30psi then if efficiency falls off dramatically after that!
Compared to the GT2056, a P/R of 1.8 would yield efficiency of up to 78%, already higher than the T2 but flow equates to roughly 130bhp at that. It could theoretically run at 42psi and still be 75% efficient! And that could be pointing towards 185bhp while stll being more efficient than the T2's stock efficiency...
Just been spying compressor maps and trying to get my head around them. Make for interesting reading compared to a T2 at the same pressure ratio. T2's seem to drop out of peak efficiency just after a P/R of 1.8 (12psi, stock for a DT-ish), at 72%. By the time you hit a P/R of 2.5 (22psi) it's at peak flow but only 60% efficiency. Makes you wonder why people run T2's up at 30psi then if efficiency falls off dramatically after that!
Compared to the GT2056, a P/R of 1.8 would yield efficiency of up to 78%, already higher than the T2 but flow equates to roughly 130bhp at that. It could theoretically run at 42psi and still be 75% efficient! And that could be pointing towards 185bhp while stll being more efficient than the T2's stock efficiency...
![[Image: signature_zps1a02ba79.jpg]](http://s1128.photobucket.com/user/martypellowe/media/signature_zps1a02ba79.jpg.html)