Is this turbo worth using?
 

So my FC came with this mystery AiResearch turbo. Its on its way out and am trying to decide whether to rebuild it or buy a new one. Based on its specs could I get to 350hp with it??

Compressor (says AiResearch T04):
0.60 A/R, 63 Trim
55.1mm / 69.4mm

Turbine (from what I gather its very similar to the stock turbine):
0.84 or 0.86 A/R? Very hard to read the ar stamping on the housing, its so worn down it took me ages to even notice its there.
74 Trim
63mm / 73mm

Havent had the chance to drive the car much yet, so cant really gauge its character. It was pretty quick spooling I think. Punchy for 5psi on a 'safe' haltech base map, atleast to me. I should mention its a stockport s4 motor.

https://cimg3.ibsrv.net/gimg/www.rx7...51794a201e.jpg
https://cimg8.ibsrv.net/gimg/www.rx7...9b7533656b.jpg
https://cimg2.ibsrv.net/gimg/www.rx7...9926c65cfb.jpg
https://cimg0.ibsrv.net/gimg/www.rx7...a18d303c9d.jpg

What are the major and minor wheel diameters? Looks close to TO4B or S but diameters will let people give you pretty accurate behaviour/power ceiling.

If the bearings and seals are dead you are probably better off buying a borg warner sxe or one of the decent build quality GTX or G series clone turbos for the money/effort. There are still plenty of people running that generation of turbo though.

Compressor
Major: 69.4mm
Minor: 55.1mm

Turbine
Major: 73mm
Minor: 63mm

I havent opened it fully, though theres enough shaft play to scrape the housing and the compressor wheel is chipped.

I wouldn’t bother rebuilding that probably limited to ~350whp without the response of more modern stuff.