Ok, latest update on turbo data that I think I've figured out so far. In order to use the performance maps of the various turbos, we need to figure out a few things about our engine, namely the pressure ratio and air volume in lbs/min. I did this using the formulas given on http://www.junkyardturbos.com/index.php. A couple of the variables I plugged in were engine rpm and ambient temperature. Maybe someone can correct me if I'm too far off base with the max rpm number (as I'm deployed and am trying to do this all from memory), but I used 5000 rpm for the top end and 2500 for the mid. Target boost pressure I set at 8psi, ambient temperature i took the average for a year in tucson AZ being 80 deg F. Do these sound about right? If so, these are the following numbers to shoot for on performance maps when selecting a turbo.
Pressure ratio: 1.54
lb/min @max rpm: 11.03
lb/min @mid rpm: 5.54
So far I have found the Garrett GT1548 performance map to be the best fit for these numbers.....problem....the cost. Haven't had a lot of luck finding sellers of this little turbo, and it's smaller than most cars would use. A new GT1548 runs between $600-$700, I need an alternative, any suggestions?