All a matter of matching the turbo to the application as we all say.
I think they work well on some of the 8P engines but may not suit the 8L so well.
I agree that they need a bit of volume to get moving but for all that the on boost pickup is amazing.
you say well matched components... I have to disagree
like for like installs where spec is zero compromise, the GTX just "dont do it for me" at all!
Laggier in every iteration I have seen so far than their std cousins, and although their comp flow spec is higher, essentially the next frame size up relative to their GT cousins, their spool is also the next frame size up,.... aka slower..
To realise their flow potential to the nonsense numbers quoted by garrett, on a 1.8t platform car, they need to be pumping up their boost levels... The GTX pressure ratios are higher to achieve their quoted max flows.. More boost = a lot more heat load which the motor will have to deal with.
The 11 blade compressor design to me is only working when you spool them up hard..
I prefer a billet style less bladed wheel (like HTA, Precision etc) as they shift more air sooner, without having to spool fast and hard to get the peak airflows.
GTX not things I would personally consider great units for 1.8t...
Best performing unit to dat for road car, all be it stroker 20v LCR was an HTA3071/0.82 all vbanded setup. Compact physically, but damn it pulled very hard... without having to wind the boost levels up to 30+psi
my 2p from the several GTX I have had my hands on thus far
EFR series is next appealing unit.. We shall see.