i went to hahn's site and couldn't find it, i'm checking to plot out the points fot this turbo at 25psi. i'm sure it can handle it, but i want to see it's limits.

after 27psi it looses its efficiency according to hrc.

ok well what i've calculated and to what i've come up is:
2.802 pressure ratio
41.58 lb/min
i only see the wheel sizes from his site, but it will help me more to compare say my turbo size. when i look at my maps, it's still very efficient at 25psi. it's still at 72% efficiency. i only see the compressor map for the regular 20G td06, and it's way off.

Guys... the compressor map is the same for all three Super 20G models.

hey Dougie you're right, all compressor wheels are the same...the only difference are the turbine housing and wheel sizes. so really now it makes sense why Armond ran out of steam passed 25psi. Armond only made 332WHP with 18psi. i don't know James, but i just hope that turbo actually does well at those boost pressures. it's risky, but i sure hope you use race gas this time just in case.

The 20G doesn't flow what some people think...

And don't forget... Hahn made what just over 500 WHP? And that was with a 150 shot of laughing gas.... so go figure guys, go figure.

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Megasquirt powered 420A
Custom turbo system

http://www.ms-custom.com

yeah i figured...so i went and looked at the S25G, pretty close to the wheel size to my SC34, mine is 2.230"/2.950, S25G is 2.381/3.073, the difference is also inlet which is 4" inlet/2.5out. and they claim this is a 700HP turbocharger. mine is 545hp. i dunno because the SC61 is a little bigger and it's 700HP.