Little Help With My Lego Swap

93GC8AWD · 10-09-2012, 07:25 PM

I have recently purchased a 92 legacy ss. I'm pulling the motor for a rebuild. But before I start, I was going to keep things simple and use a set of 2.5 dohc heads and a td04 turbo. Should I purchase a 2.5 dohc timing kit? I'm honestly only looking for around 250-300 HP.

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DohcEj22e · 10-11-2012, 05:42 PM

Yes, you must purchase the EJ25D timing kit since you have pretty much adopted that setup when you converted to DOHC heads. Make sure you use the 97-99 EJ25D heads as their chambers are well enclosed in the EJ22T bores.

Also, the passenger side head must be tapped for the turbo & since you're converting from single to DOHC, you may as well get an 11mm STi oil pump (to compensate for the increased room in the heads) & a new turbo water pump as well as new tensioner & timing belt pulleys.

Set the timing as you would an EJ25D & it will start right up. The crank pulley, crank, & cam sensors will be the same & your ECU will run those heads. You WILL have a decreased compression ratio though but that will allow you more room for boost.

10-09-2012, 07:25 PM	#1
93GC8AWD Scooby Specialist Member#: 245268 Join Date: Apr 2010 Chapter/Region: TXIC Location: Arlington, Tx Vehicle: 1993 Impreza L Wagon Blue	Little Help With My Lego Swap I have recently purchased a 92 legacy ss. I'm pulling the motor for a rebuild. But before I start, I was going to keep things simple and use a set of 2.5 dohc heads and a td04 turbo. Should I purchase a 2.5 dohc timing kit? I'm honestly only looking for around 250-300 HP. * Registered users of the site do not see these ads.

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10-11-2012, 05:42 PM	#2
DohcEj22e Scooby Newbie Member#: 289011 Join Date: Jul 2011	Yes, you must purchase the EJ25D timing kit since you have pretty much adopted that setup when you converted to DOHC heads. Make sure you use the 97-99 EJ25D heads as their chambers are well enclosed in the EJ22T bores. Also, the passenger side head must be tapped for the turbo & since you're converting from single to DOHC, you may as well get an 11mm STi oil pump (to compensate for the increased room in the heads) & a new turbo water pump as well as new tensioner & timing belt pulleys. Set the timing as you would an EJ25D & it will start right up. The crank pulley, crank, & cam sensors will be the same & your ECU will run those heads. You WILL have a decreased compression ratio though but that will allow you more room for boost.