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Old 08-14-2007, 08:21 PM   #18
Scooby Specialist
Member#: 3363
Join Date: Dec 2000
Chapter/Region: NWIC
Location: Salem, Oregon
1982 Reynard
Blue, Red, and White


^ Agreed in every way.

I chose the H6 due to rules limitations (an AWD car with a 3.0L NA engine is allowed to be lighter 110 pounds than with a 2.0L FI engine). I also compete in a form of motorsports where throttle response is absolutely everything.

Bottom line: An H6 swap is not something I would recommend for everyone.

Why EZ30 or EZ30R? These engines are lighter, I believe, than the EG33. They are definitely shorter than the EG33 and, thus, have fewer fitment issues and better weight distribution (less weight waaaay out on the nose). The EZ30R has AVLS and will allow the use of two cam profiles. It also will allow variable cam timing if you go through the effort to hook up the AVCS as well. At this time, engine management is the sticking point for the AVCS... if your ECU won't do AVCS closed loop, you'll spend a lot of time doing tuning. I my completely under-educated opinion, the EZ30 has all the same potential for power as the EG33, with less weight. The downside is significantly more wiring to get there.

EZ30 engine mounts: the stock EZ30 mounts will mount in your Impreza. The OE mounts for the R variant are plastic and WILL break. I had a pair of STi Group N mounts custom modified to fit the EZ30 (engine side of the mount is different than the EJ series engines).
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