EJ20 better or EJ25
10-24-2006, 05:39 PM
#1
Registered User
Thread Starter
Join Date: Dec 2005
Location: PA
Posts: 14
Car Info: Impreza WRX 02'
EJ20 better or EJ25
I have a question for every impreza fans.
The 2002 Impreza WRX's EJ20 is more durable or the 04+(EJ25) is more durable ?
and what's different between Spec C EJ20 and US EJ20? I heard the Spec C's engine is totally different from the US EJ20, higher RPM, more powerful, and fast reaction.
I personally like EJ20 then EJ25 because I think EJ25 is too heavy. Therefore, not good on corner.
The 2002 Impreza WRX's EJ20 is more durable or the 04+(EJ25) is more durable ?
and what's different between Spec C EJ20 and US EJ20? I heard the Spec C's engine is totally different from the US EJ20, higher RPM, more powerful, and fast reaction.
I personally like EJ20 then EJ25 because I think EJ25 is too heavy. Therefore, not good on corner.
Last edited by kansai_wrx; 10-25-2006 at 08:09 AM.
10-24-2006, 06:38 PM
#2
VIP Member
iTrader: (2)
Join Date: Dec 2003
Location: St. Louis MO
Posts: 1,245
Car Info: 02 PSM WRX
Here's a good place to start http://www.spdusa.com/wrx_intro.htm
10-24-2006, 09:55 PM
#3
Registered User
Join Date: May 2006
Location: I was up above it, now I'm down in it
Posts: 5,686
Car Info: New Government Motors SUV!
Originally Posted by kansai_wrx
I have a question for every impreza fans.
The 2002 Impreza WRX's EJ20 is more durable or the 04+(EJ25) has better?
and what's different between **** C EJ20 and US EJ20?
The 2002 Impreza WRX's EJ20 is more durable or the 04+(EJ25) has better?
and what's different between **** C EJ20 and US EJ20?
EJ205 (US WRX 02-05)
Although it's strong, it's probably the least impresive of the 4 engines. Designed for the world market WRX models, but no variable valve timing.
EJ207 (JDM WRX '99-01; JDM WRX STi '98-present)
Very sought after for it's 8K RPM limit, forged internals, valve timing, DOHC, etc.
EJ255 (US WRX '06-present)
Another very strong block with more displacement and low end torque than the EJ205. It replaced the EJ205 and also comes with DOHC.
EJ257 (US WRX STi '04-present)
Same block design as the EJ255, but different internals and heads. Very stout engine and holds up to over 500whp on stock block and stock internals and is friendlier to the bigger turbos than the 2.0liter versions due to the extra displacement.
There's more to it than that, but I just wanted to go over some of the basics. I didn't include the EJ22K used in the holy grail of Imprezas, the WRX STi 22B. They're all great engines. Some have their shortcomings, but there's really nothing "negative" about any of them in regards to performance and reliability.
Last edited by Superglue WRX; 10-25-2006 at 10:51 AM. Reason: Cam correction
10-25-2006, 08:00 AM
#4
Registered User
Thread Starter
Join Date: Dec 2005
Location: PA
Posts: 14
Car Info: Impreza WRX 02'
I always have questions
Originally Posted by Superglue WRX
Research these engine models for the Impreza:
EJ205 (US WRX 02-05)
Although it's strong, it's probably the least impresive of the 4 engines. Designed for the world market WRX models and only SOHC.
EJ207 (JDM WRX '99-01; JDM WRX STi '98-present)
Very sought after for it's 8K RPM limit, forged internals, valve timing, DOHC, etc.
EJ255 (US WRX '06-present)
Another very strong block with more displacement and low end torque than the EJ205. It replaced the EJ205 and also comes with DOHC.
EJ257 (US WRX STi '04-present)
Same block design as the EJ255, but different internals and heads. Very stout engine and holds up to over 500whp on stock block and stock internals and is friendlier to the bigger turbos than the 2.0liter versions due to the extra displacement.
There's more to it than that, but I just wanted to go over some of the basics. I didn't include the EJ22K used in the holy grail of Imprezas, the WRX STi 22B. They're all great engines. Some have their shortcomings, but there's really nothing "negative" about any of them in regards to performance and reliability.
EJ205 (US WRX 02-05)
Although it's strong, it's probably the least impresive of the 4 engines. Designed for the world market WRX models and only SOHC.
EJ207 (JDM WRX '99-01; JDM WRX STi '98-present)
Very sought after for it's 8K RPM limit, forged internals, valve timing, DOHC, etc.
EJ255 (US WRX '06-present)
Another very strong block with more displacement and low end torque than the EJ205. It replaced the EJ205 and also comes with DOHC.
EJ257 (US WRX STi '04-present)
Same block design as the EJ255, but different internals and heads. Very stout engine and holds up to over 500whp on stock block and stock internals and is friendlier to the bigger turbos than the 2.0liter versions due to the extra displacement.
There's more to it than that, but I just wanted to go over some of the basics. I didn't include the EJ22K used in the holy grail of Imprezas, the WRX STi 22B. They're all great engines. Some have their shortcomings, but there's really nothing "negative" about any of them in regards to performance and reliability.
Thank you for your infomation. But I have other questions that~
How much horsepower does the EJ205 can stand? If I want to change a big turbo, should I change the internal parts? Moreover, sometimes I feel my transmission is not following to my engine. I mean the reaction is too slow......is that ture? or just my feeling is not right?
10-25-2006, 08:02 AM
#5
Registered User
Thread Starter
Join Date: Dec 2005
Location: PA
Posts: 14
Car Info: Impreza WRX 02'
Originally Posted by MO REX
Here's a good place to start http://www.spdusa.com/wrx_intro.htm
10-25-2006, 08:18 AM
#6
Originally Posted by kansai_wrx
Thank you for your infomation. But I have other questions that~
How much horsepower does the EJ205 can stand? If I want to change a big turbo, should I change the internal parts? Moreover, sometimes I feel my transmission is not following to my engine. I mean the reaction is too slow......is that ture? or just my feeling is not right?
How much horsepower does the EJ205 can stand? If I want to change a big turbo, should I change the internal parts? Moreover, sometimes I feel my transmission is not following to my engine. I mean the reaction is too slow......is that ture? or just my feeling is not right?
ej207 > ej22 turbo motor > ej257
10-25-2006, 08:19 AM
#7
Registered User
Join Date: May 2006
Location: I was up above it, now I'm down in it
Posts: 5,686
Car Info: New Government Motors SUV!
Originally Posted by kansai_wrx
Thank you for your infomation. But I have other questions that~
How much horsepower does the EJ205 can stand? If I want to change a big turbo, should I change the internal parts? Moreover, sometimes I feel my transmission is not following to my engine. I mean the reaction is too slow......is that ture? or just my feeling is not right?
How much horsepower does the EJ205 can stand? If I want to change a big turbo, should I change the internal parts? Moreover, sometimes I feel my transmission is not following to my engine. I mean the reaction is too slow......is that ture? or just my feeling is not right?
But the EJ205 can handle plenty of power with stock internals, somewhere in the ~350whp realm, it's not an exact science. It all depends on how you treat the car.
However, your tranny is only good for around ~260-280whp. After that it becomes iffy. Once you go beyond that power level, it would be in your best interest to upgrade the gears.
But, ultimately, your title asks which is better between the EJ20 and the EJ25... the EJ25. Bigger is better in this particular case.
10-25-2006, 01:45 PM
#10
Registered User
iTrader: (2)
Join Date: Sep 2006
Location: SF
Posts: 1,293
Car Info: WRB 18g + Meth (sold) 07 BMW 335i coupe
yea i heard that the ej20 is supposedly better because of open loop system? somethin bout fuel i believe...n also that it takes mods without fuel management a little better then 04+
10-25-2006, 11:55 PM
#13
Registered User
Join Date: May 2006
Location: I was up above it, now I'm down in it
Posts: 5,686
Car Info: New Government Motors SUV!
Originally Posted by Jake
oic...thanks for clearing it up...so im assuming it might be easier to tune a 02
** I may have the open and closed loops labeled backwards, but it's not important. I just wanted to demonstrate what is happening in the ECU. Just one more reason to get a Bugeye!!!
10-26-2006, 03:14 PM
#14
![[W5]IntoTheWRX's Avatar](https://www.i-club.com/forums/customavatars/avatar43698_1.gif){kind=avatar}
Originally Posted by Superglue WRX
Yeas, but that's totally ECU related. The 02-05 EJ205 engines are identical, the ECUs are not. The problem in the 04-05 ECUs is in switching maps. They use one map for Partial Throttle (open loop**), and one map for Wide Open Throttle (closed loop**). There is a significant time delay when it switches between maps. This results in a temporary, yet unhealthy, lean condition in the engine. This can theoretically lead to engine misfires, or worse. Getting an engine management system should be the first thing on an 04-05 owners list if they plan on driving the car hard.
** I may have the open and closed loops labeled backwards, but it's not important. I just wanted to demonstrate what is happening in the ECU. Just one more reason to get a Bugeye!!!
** I may have the open and closed loops labeled backwards, but it's not important. I just wanted to demonstrate what is happening in the ECU. Just one more reason to get a Bugeye!!!
10-26-2006, 04:18 PM
#15
Registered User
Join Date: May 2006
Location: I was up above it, now I'm down in it
Posts: 5,686
Car Info: New Government Motors SUV!
Here's some OL/CL info that I found on Nabisco....
http://forums.nasioc.com/forums/showthread.php?t=671294
http://forums.nasioc.com/forums/show...hlight=OL%2FCL
Cheers!
http://forums.nasioc.com/forums/showthread.php?t=671294
http://forums.nasioc.com/forums/show...hlight=OL%2FCL
Cheers!
