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Posted 23 November 2009 - 03:05 PM
Posted 23 November 2009 - 06:59 PM
Welcome to USMB.
The Legacy engine crossmember is needed so that the turbo uppipe will fit. The crossmember is notched to allow for the uppipe to fit. I am not sure if the legacy crossmember is the same width as the Impreza crossmember. You could probably find a turbo crossmember from a GC chassis, have the existing crossmember notched or reroute the uppipe.
You will be putting an OBDI engine into an OBD2 car. So you have a few options in terms of getting the engine to run. The quick and dirty option is to trim an EJ22T harness to and then splice in the wires that are needed to make it run. It is possible to use an EJ22 OBD1 harness with slight modifications. You would use the OBD1 EJ22T ECU in this application. There are less than a dozen wires that need to be spliced and your will have your existing harness intact should you want to return to stock in the future. If you have to smog your car this is probably not the option you want do go with b/c you will be running into world of smog-ability problems. Unless you pull the turbo motor w/the N/A motor every time you smog.
One the other end of the spectrum, you can run the EJ22T with the OBD2 harness and ECU. IIRC the OBD2 EJ22 ECU can handle slight amounts of boost. I would research NASIOC and RS25.com to verify this. You would need to probably use the 98 heads on the EJ22t shortblock so that you have the OBD2 stuff on the intake manifold. You would also have to use the crank timing gear from the 98. EM would be needed if you are going to run it with med to high amounts of boost. Minimum monitoring would be a wideband O2 sensor, maybe an Exhaust Gas Temp sensor and of course a boost gauge.
One theoretical solution is to get a WRX harness and ECU and use it to run the turbo. One step further would be to use EJ25 heads and intake. Remember, it’s the closed deck shortblock on the ej22t that’s valuable,
Whatever you decide to do, also consider how much you will be spending. You could probably find a USDM WRX engine w/harness and ECU for 3k or so.
Good Luck and have fun
Posted 23 November 2009 - 08:48 PM
Posted 24 November 2009 - 02:45 PM
thanks for the tip lol. so i can bolt up a set of EJ25T heads and intake up to the EJ22T shortblock and everything should line up? if i snagged a wrecked sti could i use the subframe from that to make everything line up? the only thing i've herd about doin' one of those sti guts to gc8 chassis conversions is that 05 is pretty much that last year that everything lines up and no one can give me a direct answer on if the 6 speed rear tranny mount will bolt up in there and be in the right place. thanks again for all of your help, definately appreciated.
Go to the built motor section on NASIOC for info on hybrid turbo motors.
The shortblocks for the entire EJ series are essentially the same in dimensions. It's the cylinder diameter that determines EJ18, EJ20, EJ22 or EJ25. I have a 96 EJ25 shortblock mated to 00 EJ22 heads. Ran no problems.
Before undertaking this project, try to determine your skill level, your need for reliable transportation, and how much money you want to spend.
USMB is good for EJ swaps into the older EA cars, lifting sobbies and for great camaraderie. NASIOC and RS25 are better for the 1993-2001 chassis cars
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