EJ204 explain please

[daddykubs]

Hi all!

I\'ve been trying to get to bottom of this for quite a while now...

What is sooo special about EJ204 JDM (also sold in NZ) that it makes 190hp???

I have UK BL5 2.0R which is supposed to be 165hp.

It really does my head in. What is the mechanical difference between them?

Thanks for help

[Joker]

Wiki says: [some ppl blank out at that 1st "W" word]

http://en.wikipedia.org/wiki/Subaru_EJ_engine

 

EJ204 DOHC naturally aspirated AVCS

• Legacy JDM BL - BP series 2003-2009 190 hp (140 kW)
  

Impreza JDM GC - GF series

• 1993-1999 155 hp (116 kW)
  

about all I can help (I was curious what the 204 was actually in)

I\'m going to go on a limb and suggest the AVCS bit helps (which didn\'t feature in the 93-99 Imp\'s)

[daddykubs]

Thanks.

I have to say I am puzzled. Have been searching for quite a while now.

Managed to set that:

This motor was used in Legacy and Impreza SRX

Depending on year and transmission it develops 180-190hp

Has AVCS and 11.5:1 CR

You can find cars with that lump in Japan, Russia, New Zeland (not sure where else, but I don\'t know Japanese nor Russian)

I tried Wiki, TradeCarView, GooExchange, found links to JDM brochures here somewhere

Wiki and local dealer aren\'t really usefull.

What seems to be a fact.

EJ204 (MT) revs up to 7100, is 190hp and 200Nm, DOHC, AVCS

What I thought it is

Dual AVCS, WRX internals

What I suspect

Different inlet manifold, ECU, head or piston design

[MercuryFree]

I used to own a celica that put out 170hp from a 2.0L NA engine (factory) with 10.3:1 CR

So with the additional 1.2 CR and AVCS I can see 190 being easy enough from a 2.0L factory engine

[Marky]

Prob same sort of stuff that seperates - for arguments\' sake - a "Beams" 3SGE motor from a standard one - or any number of other "upgraded" n/a motors

Higher than normal comp (and a high octane diet being required), fancy valve timing, different ECU tune, higher rev limit than the norm, lighter insides (not turbo model bits generally)

Pure guesswork here, I has no idea what the actual story would be but imagine you\'d be beating yourself and your wallet up trying to substitute the applicable bits onto a non JDM motor

[daddykubs]

On top of that You can add Cllio 192, Type R and S2000.

My car is EDM Legacy 06 2.0R imported to UK from Malta hence no data in UK dealership.

Engine EJ204LTCLE n/a 165hp (I believe) Box 5MT

11,1:1 CR, DOHC, AVCS

Now B4 JDM

EJ204

2003-2006 190hp TA-BL5

2007 180hp ABA-BL5

and revised

[DRFVDR]

dont know the total answer BUT I would hazard a guess at maybe dual VVT cams ( inlet and exhaust) different tune, higher compression and a higher redline would give you the extra HP

[daddykubs]

Double AVCS is under question- I have seen JDM brochure/specs sheet

and it clearly states under GT- DOHC, 16 valve, DUAL AVC ,

and then 2.0R- DOHC, 16 valve, AVCS

Also Germans claim the can remap EJ204 from 165 to 180 without any other mods...

[Joker]

`anything non JDM gets detuned

especially euro\'s or ozzy

[94 Leone]

Fuel octane and climate have a lot to answer for too ya know i.e higher air density at sea level.

[daddykubs]

^

+1 on climate. I read this guy\'s post about tuning and living in high moutains and his hp was like 98 or something silly

But have to disagree on fuel:

JP low octane is 89RON premium is 96RON according to Wiki

GB low octane is 95RON premium is 97RON also You can get Shell Vpower 99RON (Iuse it)