The following info was derived by using Squirel Performance's Turbo Calculator. I ran 3 different HP combos for the new 572 inch big block. I did the calculations below before I was aware of the calculator from Borg Warner on the preceding page.

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1200 HP Data with minumum boost at 3500 and maximum boost coming in at 5000. Maximum boost at the manifold (on the gauge) would be 14.2 psi and about 17.3 psi on the compressor side of the turbo before the intercooler and piping to it and from it to the carb ...

1200 Turbo Map with a T76 Turbo........................

1400 HP Data with minumum boost at 3500 and maximum boost coming in at 5000. Maximum boost at the manifold (on the gauge) would be 18.3 psi and about 22.19 psi on the compressor side of the turbo before the intercooler and piping to it and from it to the carb .........................

1400 HP Turbo Map with a T76 Turbo.....

1600 HP Data with minumum boost at 4000 and maximum boost coming in at 5500 (note changes on min/max boost from previous HP levels). Maximum boost at the manifold (on the gauge) would be 22.3 psi and about 27.15 psi on the compressor side of the turbo before the intercooler and piping to it and from it to the carb. Tthe boost levels are getting pretty high and the intercooler is going to have to work well for this to work.

With a progressive boost controller like the TURBOSMART e-Boost 2 where the boost can reference off of the gear you are in, or the rpm or timed based. You can only use one of the preceeding at at time. Using the boost controller we could bring this highest boost on in only high gear in the last mile....................

1600 HP Turbo Map with a T76 Turbo (note I changed the minimum boost to 4000 and the maximum boost comes in at 5500 to keep away from the surge line on the left) .....

With the calculator used above the T-76 turbo looked pretty good for the 572 up to 1600 HP levels. To further check that I wanted to use the Borg Warner Calculator that was used on the preceding page. The problem is that the only maps you can look at with that calculator are for Borg Warner turbos.

To overcome that little problem I took a T-76 map and plotted the pressure ratio and the lb/min of air at each of the 6 data points from the BW calculator onto the map. Here is what I got for 1200 HP.

You can see above that the 6th point is off the map in the 65% efficiency area near choke. If you go to the first map on this page the last point (1200 HP) is near the 75% line. Which calculator then is right? I'm going to go with the more conservative BW one as I'd rather error on the save side. I still think that the Squirrel calculator can be a good tool to use and is better than just saying a turbo is good for say 800 HP and buying it based on that alone.

Now I'll show a T-76 map again with the data from the BW calculator for 1400 HP.

Now the 6th point (1400 HP) is off the map and the 5th point (1300 HP) is over in the 65% efficiency area of the map. Back a page with the SX400 turbo the 5th point is at 71% and the 6th is at 67%.

In conclusion I still think the T-76 turbos (2) would work easy to 1200 HP and probably beyond but two of the SX400 (171702) turbos which are not all that much more money could easily do 1200 HP and should be good into the 1400 HP range and maybe more. Time will tell if this was a good choice and obviously there are other better choices, but instead of $700 a piece turbos now we would be looking at $1300 to $2300 dollar apiece turbos. Maybe later. Also based on past speeds with the Stude and HP in the 800 to 900 range 1400 HP should be good for close to 300 mph, which is faster than we want to go with this car in one leap. This will be a gradual road with the turbos as we are starting into speeds where few Studebakers have gone.