There are way too many people on here trying to decide on turbos that are so close together.....
Blouch's site..... 4. Mitsubishi TD05H turbine wheel
TD06 compressor housing
FP's Site.... Rapid spool and large torque numbers are guaranteed by the TD05H turbine section
I believe the the compressor housing on the 68HTA is a td05 16g housing....which makes it smaller than the 18gxtr housing.
So it seems that FP is claiming more flow throw a smaller housing......
Based on what i think the compressor housing is on a 68HTA i would give the edge to the 18gxtr all day long. Especially if you went compared 7cm vs 7cm up to 10cm vs 10cm combinations...the 18g should win, imo.
The problem is that we now have 7cm, 8cm and 10cm turbine housing available for each of these turbos.....so its a cluster phawk of different turbos all simply labeled as "68HTA" and "18gxtr". there is 6 different combinations of each turbo.
i mean a 7cm 68HTA will get killed on the topend by a 10cm 18gxtr and a 10cm68HTA might make more topend than a 7cm 18gxtr.
Basically, the turbos are so freaking close that my decision would be based on the 16g housing....its tiny.
If you wanna put things on a level playing field then it should be 47 lb/min 20gxtr vs 68HTA.....
IMO if you're looking for topend.....get a gt30 range turbo....dom1,2, or 2.5
if you get a 8cm dom2.5 the lag isnt gonna be horribly different but the topend will be wayyyyyy better.