In case you guys dont stumble across the thread , heres a link , https://www.rx7club.com/showthread.p...43#post6874743.
With all the right mods to support higher revs , I'm trying to decide what a/r I should go with , using a pair of GT3040R's , heres the info on them.........

Dual Ball Bearing "GT30/GT40R" Turbo assembly. T3 style inlet flange with 4 bolt T31 style exit. This turbo incorporates the same exact GT40 compressor wheel found in the popular GT35/40R, but runs the smaller 60mm w/84 trim turbine wheel from the GT30R. Appropriate for smaller engine where the GT35/40R feels too big, but the high amount of compressor flow is needed for the desired HP and boost levels. Large T04S style compressor housing with 4.00 inlet and 2.50" outlet. This turbo has a flow capacity of about 600HP.

Turbine
-Wheel: 60mm w/ 84 trim
-Housing: .63 ar, .82 ar, 1.06 ar


Compressor
-Wheel: 82mm w/ 56 trim
-Housing: .70 ar

 

Anyone ???

 

With a setup that custom, you're going to have instrument the car and play with a few sizes...

 

Thats what I'm afraid of ! I guess it would all depend on how high I'l be reving the motor !

 

I typed a big reply then deleted it.

I think your going totaly the wrong way mate in short version of what i was typing.

send Howard Coleman a pm and ask him for some advise.

 

care to explain ? ...........and I exchanged a few e mails with Howard already , but his setup and mine aren't the same , for starters , he runs a street port and I a semi pp .