Nice! Yes that's the exact turbo I have. I seem to remember there was some compressor fin damage or something. It's been years since I've looked a the turbo. Will grab some pics of it tomorrow, it's at my parents place.
The video sounds great. I loved the noise that turbo made on my ae86.
http://www.atpturbo.com/mm5/merchant...egory_Code=GTH
The above turbine housing would allow me to drop in the gt2860 in the spot where the 4854 is now with little to no changes. A strange note on the atpturbo page though...
T31 (T3) turbine housing with 4 bolt outlet. Fits turbine wheel found on GT28RS, GT2876R (GT25/40R) and all GT2871R turbos. Turbine housing A/R is Garrett T3 .63, or .82 A/R. Turbine flow rating of .63 A/R T31 is comparable to T25 flanged .86 AR.
The turbo currently has a t28 .63 ar housing. Seems they are suggesting the housing size difference between the t3 and t25 is significant even without the AR change.... I suppose I'd still get the .86 AR four bolt t3 housing to achieve similar performance to the v band tial housing you're running? Very nice housing btw. I wish I had went with a vband mani...
Lastly, as far as spool, in third gear from an off throttle roll, would you have full boost by mid 3k rpm?