The Garrett turbo Mike has now dates to 1997. It is a prototype GT.
Since Garrett was a sponsor at the time, and it was not production, they would not give me a compressor map, nor much specific information. I do know the compressor is 70ppm at 65% eff.
That is on a standard day. SEA LEVEL and I think 85 degrees f. We used to use 60 deg f back in my turbine days, but it has changed like most everything.
We saw 600 RW HP at 600ft altitude and 90deg f. at only 7400RPM.
With a better head, and more valve lift than the .600" I ran, he will make more power with that turbo.
At Bonneville, when barametric is 25" Hg, HP will be less at the same boost pressure. Turbo's have come a long way since then, but even your 1200HP turbo will loose flow.
When you look at the car and changes I made thru the years, when running with the turbo motor the car was only lowered about 2".
The speeds I ran that week were not representative of what the car could have ultimately done. The down run was 208.somthgingh and the return with #4 exh valve seat starting to go away, was only 201... The down run I had to lift completely going into mile 3. The rear was trying to pass the front, really bad. The 208 would have been way higher had not "racing" happened on both runs.
Later years The car was lowered to the max and went 180 with a N/A motor that only had 335 HP.
Point is, with essentially a new car, Mike can run that turbo for at least 2 years before he needs something bigger. My advice to him has been to get up to speed, and when he runs out of compressor he can then look around at what is out there. Garrett and KKK (BorgWarner) have really great products.
He has a base engine that will fully be able to support 120 ppm, but needs to work up to it.
I'll stop rambling, and keep offering Mike all the support I'm able to provide.
I have even figured out a way he could run Production Supercharged again. It might be a little pricy but there are some parts out there that would make it possible.
Years ago, while at Ford, I made 2 tall deck blocks by furnace brazing partially machined iron plates to the decks of production blocks that had bores that were only rough machined. (actually silver brazing)
The project lacked funding and was cancelled. The blocks disappeared. (NO, NOT ME). I'll bet they are still somewhere around SE Michigan. I suspect that block would be acceptable to SCTA since it is a modified production part. Gee......I wonder.