Turblown Engineering has developed this 300 to 400rwhp turbo system package for your 93-2002 FD3S Rx7. This setup has been developed from over 18 years experience with turbocharged rotaries. These turbo systems are not only dyno tested, but have years of track testing behind them.
First and foremost one has to choose whether you want an IWG( internal wastegate) or EWG( external wastegate) turbo system. The iwg system is much quieter as the waste-gate discharges into the downpipe, where as the external wastegate is very loud once full boost pressure is reached. The IWG system is much more reliable in terms of component maintenance, and simpler to install. The IWG also has the best transient response, and the lowest boost threshold. The EWG makes more peak RPM power, and ultimately more power in general( bigger turbo selection available with SXE turbos). The smaller 7670 IWG will hold as low as 8 psi. Generally a turbo-smart actuator is needed to hold 15 psi or more to redline. Size of the exhaust system, and engine VE have an affect on overall higher RPM max boost pressures. If you need additional help choosing between IWG or EWG, read more here.
For this particular 400HP package the EFR 7670 IWG is the best choice. It generally makes the following power levels;
300rwhp @ 8 psi on pump gas( with quiet exhaust, and stock ports)
300rwhp @ 6.5 psi on E85 with full 3" off road exhaust ported engine
360rwhp @ 15 psi on pump gas full 3" off road exhaust stock ports
400rwhp @ 15.5psi on E85 with full 3" exhaust small/medium port
460rwhp @ 20 psi on E85( max power level) with large streetport
Read more about the IWG turbo systems in this blog post.
The EWG version of the cast EFR 7670 turbo system makes about 15 more RWHP per psi than the above, with about 500rpms later spool time.
The EWG SXE7670 does the same as the EWG EFR 7670, but with an added 300rpms of lag. Keep in mind the SXE does not have a built in bov or boost control solenoid as the above EFR models( both IWG & EWG)