Nick,
Thank you for the info and the hours of research you just caused me :rockwoot:
Not to piss in your cheerios as you've been around an likely forgot more than I'll ever know, but I found out some info about those turbos and more specifically the J vs Cupped designs. Apparently they are different yet are being advertised interchangeably.
Reposted from:
https://www.facebook.com/media/set/?set=a.243568358997248.62322.160773747276710&type=3
Here we see the 'high flow' version, with a more pronounced 'cup' to the turbine inducer blade. The trailing edge also has a slightly different design as well.
This design has proven very popular on equal-length, pulse-optimized manifolds, utilizing twin-volute (twin-scroll) turbine housings. However, they work quite well on single-volute housings as well.
And, shown here, is the 'lower flow' version, with less pronounced 'cup' to the turbine wheel inducer. The trailing edge is a less contoured design. These wheels are typically very effective on single-volute (single-scroll) turbine housing and manifold designs, although they work quite well in twin-volute systems as well.
Detail close-up of 'lower flow' wheel, showing the lessened 'cup' of the turbine inducer.
Detail of the 'high flow' variant, with more pronounced 'cup'.
And just for clarification about the turbo you posted:
62mm/83mm FMW compressor, 76/68mm Turbine
179077, .83A/R, T4, Twin-volute, single-valve wastegated
179078, as above, but with “J” turbine
The wastegated units above are low-valve-flow designs; single valve on only one volute.
Cheers! :chug: :st: :ft: