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Old 10-09-2012, 08:25 PM   #1
Scooby Specialist
Member#: 245268
Join Date: Apr 2010
Chapter/Region: TXIC
Location: Arlington, Tx
1993 Impreza L Wagon

Default 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.
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Old 10-11-2012, 06:42 PM   #2
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.
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