Any tests of GT28 vs. VTG 68 mm?

How is the spool?

Rather than putting a set of 68 mm VTGs how would twin GT28s work?

 

Here's a graph comparing a VTG setup with intake, exhaust and a tune against Switzer's P800 package using Switzer's Tial Alpha 28's.

Granted it's not a 68mm VTG, but these 28's spool within 100rpm's of the stock VTG's.

 

These turbos are very close in spool and power production, IMO.
My car with A28s and EVOMS programming ran 5.54s 60-130 and a 997tt with 68mm VTGs from Champion ran a 5.50s.

 

For comparison's sake, here's the dyno of a car with our 68mm VTG's. This sheet is from an AWD Mustang dyno..but OK for comparison's sake.

Keep in mind also that VTG's will always be a much easier install, no cutting required. The also allow you to use factory ECU boost control, rather then an external boost controller (which could fail).

 

Sounds fantastic!