The Supra Guys swear by Nitrous. From my own personal experience (Hot Air and 83 Carbed Turbo), NOS if properly used is great on a Turbo car. If your TUNE is NOT RIGHT, you will find out quickly. 35-125hp should not be a problem unless you are not getting FUEL. I have never seen anyone outside of Ken Duttweiler and the Resident Mad Scientist, Don Wang use more than 250hp. Don uses NOS to get his big turbo to spool. It turns off at a certain rpm. Duttweiller had a fogger setup on his DFI GN. Not sure of his setting, never were disclosed! Wtih NOS as a power adder with a Turbo, you have to really understand fuel and timing. More fuel, less timing. On a Hot Air, NOS is worth more than it would on Intercooled car. Hot Air charged air ranges from 260-300 degree. Spraying NOS brings temps down into the 130 degree range. Even with a 35hp shot, you now have 50hp. Bear in mind, you also picked up 2-4lbs of boost.

. So, with a stock Hot Air being 200hp, spraying a 35hp shot now = 250hp. You must compensate fuel for the extra hp, and the extra lbs of boost. At this time, timing is not a issue. Any thing above this, you would need to consider getting a chip to reduce timing. Hot Airs DON'T like alot of timing. Even if you add a intercooler to a Hot Air, they don't like timing.
With the "new" emergence of E85 and TT chips, I believe you get up to 150hp (worth 225hp). XFI, progressive controller, or some form of Management unit could meter the NOS. But the big question is for how long. I sprayed (75hp) my T Type for almost a year and half. I only had issues when I stepped up to slicks (street raced on BFG R1's) and red strip convertor. BQ Tranny started to slip.
There is a board member I followed for a while, I believe his name is Kevin Bright. He strayed his 9 sec T Type. I believe he was using XFI to control his NOS. I am not sure of the amount he was spraying... I can remember Duttweiler was spraying his 4.1 DFI GN into the 10's and also into the 9's. So NOS can be used efficiently if you are on your game! The Import Crowd is still spraying Turbos...EKanoo 6.15 @230, BOOSTLOGIC spray 200hp to spool Huge Turbonetic's Turbo.