Turblown Engineering FC3S 13BT Cast EFR IWG Turbo System


The Turblown Rx7 EFR IWG Turbo System is the most reliable & fastest responding turbo system available for the 13B rotary engine. At the heart of this turbo system is a Ball Bearing BorgWarner EFR(Engineered For Racing) Turbochargers. These Internal Waste-Gate EFR turbochargers also feature Built In Recirc Blow Off Valves, & 3 Port Boost Control Solenoids built into the compressor cover. All of these features in one package reduce the complexity of your turbo system. 

Every single piece of this turbo system is designed for the highest reliability and performance that money can buy. As of 10/17/15 this turbo systems now includes our new 347SS investment cast EFR IWG T4 manifold. This manifold comes standard with twin 1/8 NPT exhaust gas temperature or exhaust manifold back pressure ports( plugs included). The turbo system cooling lines mimic the factory in terms of reliability with partial or full 304SS heavy wall hardlines, with high temp silicone lines for mating to the OEM hose barbs. Oil return line silicone hose is oil compatible, and double wall heat-shielded. 

At the heart of the system is an EFR 7670 turbo that delivers the fastest boost response, and lowest boost threshold possible and is perfect for a 350 to 400rwhp street, or AutoX car. The 7670 & 8370 will hold boost pressures as low as 6psi with a wide open 3 inch exhaust regardless of the port work. The 7670 will make over 425rwhp at higher boost pressures(20 psi range), and the 8370 another 30+rwhp.

The internal waste-gate configuration offers considerably less noise than open dump tubes. This is more desirable for street and track cars with decibel limits & emission restrictions. With a proper tune, and the OEM catalytic converter installed one should be able to pass an emission tailpipe test( assuming engine health, and auxiliary components are working properly). Furthermore one does not have to worry about melting your external wastegate lines, or blowing your waste-gate diaphragms( common on road course driven cars with external wastegates). The internal wastegate is also a divorced unit, with two separate runners leading up to one single 42mm waste-gate valve. This is the best internal waste-gate design of any turbocharger. This turbo system is a true twin-scroll unit. It completely separates the exhaust pulses between the two rotors. This separation not only makes more power, but increases boost response. The 7670 internal 42mm waste-gate has been proven to properly control boost pressure on a 13b without any creep.This turbo system comes standard with the medium waste-gate canister. A TurboSmart EFR IWG dual port actuator is recommended for those who wish to run both medium and very high boost pressures with the OE EFR solenoid. 

This turbo system Does Require Supporting Modifications such as an aftermarket ECU, intercooler, clutch, fuel, & ignition upgrades to reach it's full potential. 
Turblown Engineeing offers a Lifetime Limited Warranty for the original purchaser on the turbo manifold and downpipe. The turbo is under BorgWarner's One Year limited warranty. We have yet to see a single EFR turbocharger fail in over 7 years of use, and having sold 1000s of them! 

OEM A/C line & RA omp adapter compatible with all models 

Some EFR 7670 castings do require grinding of our current cnc brackets. 

The turbo and manifold can be installed together before being placed in the engine bay. Installation does not require the engine to be removed, jacked up, or any studs pulled. This is the easiest single turbo to install that we have ever seen. 

After one heat cycle the turbo to turbo manifold nuts will need to be re-torqued to ensure the life of the Inconel T4 gasket. The nuts should also be checked at regular maintenance intervals.

We have weighed our cast manifolds vs our welded units and they actually weight a few ounces less! Since these manifolds are investment cast, they are less than 1/2 the thickness of your traditional cast iron turbo manifolds, and therefore do not retain as much heat as cast iron manifolds. There are zero downsides to this casting process vs welding. 

Inconel stud kits have 1.5 thread pitch that go into the manifold and 1.25 thread pitch nuts 

Installation Notes 

  • Coolant port plugs must be swapped from original BW orientation in some cases( orientation from BW is random).
  • ABS sensor line requires heat shielding
  • EGT/EMBP plugs on manifold will require anti-sieze and proper tightening if ports are not used. Do not over tighten supplied plugs.
  • Anti-seize should be used on all fasteners including vband clamp
  • Start with 3 turns of preload for OE BW medium actuator, Start with 1 for turbosmart units
  • Make sure waste-gate rod is perfectly aligned with side loading after installation supplied WG bracket adapter. Tighten wg bracket adapter to OE BW bracket first, then install on turbo, then install WG actuator to bracket
  • It is recommend to start tuning with WG pressure only( no solenoid), and ECU boost cut settings enabled.
  • External Oil restrictors are NEVER used. Make sure crankcase(oil pan) has adequate vent
  • 3" downpipe does not come terminated at the rear ( no flange). OEM midpipe is 2.5", and not all manufactures end at the same location.
  • Stock location coolant feed port on lower intake manifold is not used, a block off plate( not supplied) is required. OEM throttle body coolant feed line on rear iron should be block off( tapping and plugging recommended).
  • Vmount installation do not leave much room for an air filter to be attached directly to the turbo. Supplied unit will not fit directly on the turbo( although smaller ones can be fitted- see photos). A cobra style coupler and turbo inlet duct will need to be purchased/fabricated( not included).
Electric fan required for all installations


The default kit includes the following parts; 

T4 .92 IWG EFR turbocharger with medium BW actuator 

347SS IWG Turbo Manifold

CNC wastegate adapter bracket

3" 304SS down pipe( 1 o2 bung) & vband clamp

Inconel hardware kit ( between turbo manifold and turbo). 

Inconel T4 turbo gasket

EFR solenoid female pin and connector kit( for wiring to boost controller)

Oil & water feed & return lines ( including necessary adapters fittings, hose and clamps etc)

K&N Air filter