Twin Turbo Conversion info
Back in 2001 I was one of the first to complete a twin turbo conversion on my n/a 3S. I'm sure there have been new findings for better ways to do the conversion since then, but here's the information I've compiled. It's the same information still posted on 3SX.com, but I figured I'd post it here, too. It might be helpful for anyone wanting to take on this task.
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Here's a list of parts you'll need.
Turbos from a VR-4, either the TD04 9b's or TD04 13g's, with wastegate actuators
Exhaust manifolds and the manifold gaskets from a VR-4
Oil housing from a VR-4
Oil feed and oil return lines for the turbos, and all the eyebolts and gaskets
"Joint" on the back of the engine block for the rear oil feed line
Modified non-turbo oil pan to accept oil return lines
Water housing from a VR-4
Water feed and water return lines for the turbos, and all the eyebolts, washers, and gaskets
o2 housings and pre-cats from a VR-4
Downpipe from a VR-4 (remember that if you have Gen 1 pre-cats, you need a Gen 1 downpipe, etc)
Fuel injectors from a VR-4. The stock 360cc injectors are just fine.
Fuel pump from a VR-4.
Electronics/Gauges you'll need
S-AFC, S-AFR, or some other way to control the fuel.
Boost gauge
Air/Fuel ratio gauge
Exhaust Gas Temperature gauge (two is better)
Pocketlogger - very useful for monitoring everything, especially knock
Optional things (or things other might tell you that you need)
ECU from a VR-4
Engine wiring harness from a VR-4
Injector resistor pack from a VR-4
Boost controller
The parts below in the table are new parts I got from Mitsubishi, and they're mainly the oil/coolant lines and all the bolts and gaskets you need for that and for the exhaust.
Mitsu Part# Description Quantity
Oil Lines
Front (Right)
MD161898 Tube, T/C Oil Feed, RH 1
MF650102 Eyebolt, T/C (feed line) 2
MF660063 Gasket, T/C (feed line) 4
MD160039 Tube, T/C Oil Return, RH 1
MR258477 Gasket, T/C Oil Return Tub 2
MF241225 Bolt, T/C (return line from T/C) 2
MD193110 Bolt, T/C (return line to pan) 2
Rear (Left)
MD174793 Tube, T/C Oil Feed, LH 1
MD145960 Joint, T/C (feed line) 1
MF660063 Gasket, T/C (feed line) 3
MF650102 Eyebolt, T/C (feed line) 1
MR266015 Tube, T/C Oil Return LH 1
MR258477 Gasket, T/C Oil Return, LH 2
MF241255 Bolt, T/C (return line from T/C) 2
MD193110 Bolt, T/C (return line to pan) 2
Coolant Lines
Front (Right)
MD194061 Pipe, T/C Water Feed, RH 1
MS650013 Eyebolt, Cooling water line 1
MF660064 Gasket, Cooling water line 2
MD153689 Pipe, T/C Water Return, RH 1
MS650013 Eyebolt, Cooling water line 1
MF660064 Gasket, Cooling water line 2
Rear (Left)
MD158758 Pipe, T/C Water Feed, LH 1
MD158989 Eyebolt, Cooling water line 1
MF660064 Gasket, Cooling water line 2
MD153691 Pipe, T/C Water return, LH 1
MS650013 Eyebolt, Cooling water line 1
MF660064 Gasket, Cooling water line 2
Miscellaneous
MD319539 Gasket, thermostat case 2
MD165017 Gasket, cooling water outlet hose fitting 1
MD147332 O-ring, cooling water line 1
MD161392 Joint, engine cylinder block 1
Exhaust Stuff
MD168266 Gasket, T/C exhaust inlet 2
MD077551 Seal ring, T/C exhaust inlet 2
MD168267 Gasket, T/C exhaust outlet 2
MD132930 Nuts 5
MD132933 Washer 1
Other Exhuast
MD165879 Nuts, manifold 14
MD168979 Lock washer, manifold 14
MD000436 Flat washer, manifold 14
MB687002 Exhaust gasket, front pre-cat/DP 1
MB687015 Exhaust gasket, rear pre-cat/DP 1
MB687002 Exhaust gasket, DP/main cat 1
