I am in the process of adapting a MHI TE04-13C turbo to an Opel 1.9 CIH (SOHC) engine.
It will also have EFI and ecu from the same 2.5 turbo Dodge. I have a AFPR to dial back the fuel pressure about 25% to compensate for the engine size difference.
I have the intake manifold modified for the port injectors and Dodge TB and built an adapter to drive the turbo dodge distributor off the nose of the camshaft.
The turbo ex manifold is mocked up based on designs by californiagting and rallybob on the Opel GT board.
It has been difficult to find info on the Mitsu turbo but from the compressor map and airflow plots I have done it looks fairly well matched to the 1.9 Opel engine.
I have assumed that the airflow of the head is similar to the 2.2-2.5 MOPAR ie average.
The turbo flange will be fed off the bottom of the manifold, placing the reclocked cold side toward the front with discharge pointing down. This places the wastegate actuator against the block, so a custom mount and extended actuator shaft will be needed.
The hot side exhaust will need a custom exit. I think a fabricated exit combining the wastegate flow with the turbo flow will be somewhat better than the factory cast outlet. I plan on a v band connection either before or after the 90 degree down bend and a flex section in the downpipe. Most likely 2" or 2.5" exhaust from there. Calculated airflow is around 369 CFM, which correlates to a hoped for 250 flywheel hp.
I plan to smooth both hot and cold side housings without changing any contours.
Would it be beneficial to open the turbine housing to reduce backpressure or would that be counter productive as in reducing the energy input the the turbine?
I think that some of the concepts outlined in the thread on the Garrett outlet optimization would apply here.
Any constructive comment will be appreciated. Maybe some of the strategies developed here could also be used by those who are still running a Mistu on a 2.2 or 2.5 MOPAR?
PS I also have a Turbo Minivan and a 1984 Rampage that will be getting a 2.5 turbo motor.
The mini has a Mitsu but the Rampage engine has a TBI turbo manifold and a TII Garrett.