Borg Warner twin turbo sizing
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Registered User
Joined: Aug 2017
Posts: 6
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From: Charleston, SC
Borg Warner twin turbo sizing Hey guys, I could use a little help with choosing the correct size turbos for my build. Here's what we're working with:
-Iron block 5.7
-Brian Tooley stage 2 or 3 turbo cam kit (I could use some help picking which to go with too)
-Stock 317 heads
The car is a '93 Rx7 with a T-56 trans. I'm looking at the Borg Warner S300SX-E (I'm going with twins for packaging) but I'm open to other suggestions. Here's where I need some help. I'm not sure what compressor or turbine I should go with. I'm shooting for 600-700hp to the wheels with quick spool up. The S300s compressors range from 61mm to 69mm and the turbines are T4 inlets with either twin scroll .91 or 1.00 A/R or a .88 open inlet. I have heard that you can get a T3 hot side for the S300s too.
The car is going to be driven on the street primarily so I'm more concerned with area under the curve than peak hp. Hopefully I didn't leave anything out, and thanks in advance for the help!
-John
-Iron block 5.7
-Brian Tooley stage 2 or 3 turbo cam kit (I could use some help picking which to go with too)
-Stock 317 heads
The car is a '93 Rx7 with a T-56 trans. I'm looking at the Borg Warner S300SX-E (I'm going with twins for packaging) but I'm open to other suggestions. Here's where I need some help. I'm not sure what compressor or turbine I should go with. I'm shooting for 600-700hp to the wheels with quick spool up. The S300s compressors range from 61mm to 69mm and the turbines are T4 inlets with either twin scroll .91 or 1.00 A/R or a .88 open inlet. I have heard that you can get a T3 hot side for the S300s too.
The car is going to be driven on the street primarily so I'm more concerned with area under the curve than peak hp. Hopefully I didn't leave anything out, and thanks in advance for the help!
-John
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Verdad Gallardo Doh sorry, the AGP .63 ARE T3 not T4. I had S200 51mm with the .63 previously and they made 740/810 on a chassis dyno, so if you find those a lot cheaper they will meet your needs.
TECH Fanatic
Joined: Jun 2013
Posts: 1,163
Likes: 16
From: Avon, Ohio
Twin t4 67s where plenty peppy for me on a 5.7. Made great power too 
* 870whp was 23psi**
Here is an in car when I was testing my home made 2 stage boost controller. Gives you and idea of how boost recovery was
* 870whp was 23psi**
Here is an in car when I was testing my home made 2 stage boost controller. Gives you and idea of how boost recovery was
