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

 

Also, I'm going to be running e85

 

You could make those numbers with a single S300. I have a buddy that did 650whp on a standard s366 with a 5.3 and t56.

 

But twins look so cool! Good to know though! Thanks for the input! Any idea what size twins I should consider if those are too big?

 

You would be better off with a smaller frame turbo such as a "GT35" size or a 6262. They are physically much smaller and will meet your goals.

 

I got a set of 62/66 precisions t3 housing laying around if interested

 

So apparently I need to go smaller... Does anyone have any experience with the S200SX-E turbos? 57mm compressor, turbine A/R from .83 up to 1.27 with a T-3 flange.

 

I have those on a 6.0 and they are good. The BW s200 turbine housings are slow spooling...spend a little extra if you get any s200s and get .63 AGP T4 housings.

 

The t4s spool faster than the t3s?

 

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.

 

Call Jose at forced inductions or lil John motorsports

 

Awesome! Thanks for the help guys!

 

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

 

If you're only looking for 700hp, a pair of very small S200's will be quite fine.

 

Hi, if someone likes Holsets, and wants to roll their own twin kit which would be a better choice for a stick shift L33 5.3 with 317 heads, a pair of hx25s or T3 flange hx30 's ?

 

I'm running twin s366's and shooting for 1200 rwhp on a 370 ls. Using truck manifolds and fabricated my own hot side . Still have to finish a few things but it should be done next week at the latest