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Old 04-03-2009, 09:22 AM   #1
saab-on-the-cobb
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Question Will my 2006 WRX ECU control an EJ257 longblock?

I searched, but could not find the answer.

Will a 2006 WRX ECU safely control an STi engine?

Thanks!

sotc
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Old 04-03-2009, 10:31 AM   #2
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sure it will if its tuned
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Old 04-03-2009, 01:17 PM   #3
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Quote:
Originally Posted by saab-on-the-cobb View Post
I searched, but could not find the answer.

Will a 2006 WRX ECU safely control an STi engine?

Thanks!

sotc
Yes, ej255 and ej257 = same engine except pistons.
Tossing the ej257 onto your 2006 wrx (i'm assuming) will raise the compression.

So have it retuned.
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Old 04-03-2009, 02:09 PM   #4
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Quote:
Originally Posted by Nuke209 View Post
Yes, ej255 and ej257 = same engine except pistons.
Tossing the ej257 onto your 2006 wrx (i'm assuming) will raise the compression.

So have it retuned.
ej257 has lower compression. the compression ratio on the 255 is 8.4-1. the compression on the 257 is 8.2-1.



different pistons, different crank, different cams, different heads, they are not the same motor
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Old 04-03-2009, 03:10 PM   #5
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Here we go......
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Old 04-03-2009, 06:56 PM   #6
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Yes with a retune and the right sensor placements. The wrx heads only have 1 Cam sensor while STI has 2 and the placement is a little bit different. You can buy a bracket to compensate for this and then run the sti longblock. also, plug up the avcs oil holes since the wrx ecu has no control for this.
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Old 04-03-2009, 07:28 PM   #7
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Quote:
Originally Posted by Fongers View Post
Yes with a retune and the right sensor placements. The wrx heads only have 1 Cam sensor while STI has 2 and the placement is a little bit different. You can buy a bracket to compensate for this and then run the sti longblock. also, plug up the avcs oil holes since the wrx ecu has no control for this.
I thought my 06 2.5L had AVCS?

sotc
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Old 04-03-2009, 08:16 PM   #8
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Quote:
Originally Posted by ronzogonzo View Post
ej257 has lower compression. the compression ratio on the 255 is 8.4-1. the compression on the 257 is 8.2-1.



different pistons, different crank, different cams, different heads, they are not the same motor
same rods, same block, same valvetrain/cams, same avcs cams.

different head casting with combustion chamber, different pistons different avcs lines


More importantly, what year EJ257?
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Old 04-03-2009, 09:46 PM   #9
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Quote:
Originally Posted by Fongers View Post
Yes with a retune and the right sensor placements. The wrx heads only have 1 Cam sensor while STI has 2 and the placement is a little bit different. You can buy a bracket to compensate for this and then run the sti longblock. also, plug up the avcs oil holes since the wrx ecu has no control for this.
06 wrx = avcs
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Old 04-04-2009, 12:41 PM   #10
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Quote:
Originally Posted by ronzogonzo View Post
ej257 has lower compression. the compression ratio on the 255 is 8.4-1. the compression on the 257 is 8.2-1.



different pistons, different crank, different cams, different heads, they are not the same motor
yes, but the combustion chambers are different in the sti heads.
So are the pistons.
Find the thread about the ej255 & ej257 difference, sponaugle posted some great info.
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Old 04-04-2009, 01:30 PM   #11
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Quote:
Originally Posted by FuJi K View Post
More importantly, what year EJ257?
The shortblock is a brand-new 2004.

Have not bought the heads yet, but I'm looking for '06 heads.

I want to keep the stock engine intact, and build a badass STi engine.

I'm not against using WRX 06 heads, but I would prefer the lower compression of the STi engine and NOT the raised comp of the WRX heads/STi block.

Also, I want better flow without machine work.

I'm not looking for physical differences, but whether the 2006 WRX ECU is fully able to control the 2006 STi motor.

It'd be way easier, I suppose, to drop WRX forged pistons in the block and have a set of 'o6 WRX heads machined to flow better.

I'd really like the STi motor, as I've found very good prices on pistons and heads for that particular app.

SOTC
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Old 04-04-2009, 01:49 PM   #12
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To my knowledge the ecu will work, but you ought to check the pinouts in the corresponding manuals to verify that all the sensors and controls have the same voltage ranges since there's a 2 year gap on the equipment.

Does anyone make forged WRX pistons? Aside from a custom set, all I've found were 257 pistons listed as 257/255. That is, less dish volume than the actual 255, so you'll end up with an even higher CR running on WRX heads as you said, 8.7:1 range.

Also, I've read that the 255's combustion chamber is slightly more insensitive to the tuning strategy used than the 257's. I don't have a link, but it was in PPB.

I really wish people would stop talking out of their ass about these motors. If you don't know for sure, don't spread misinformation. The facts are here: http://forums.nasioc.com/forums/show....php?t=1667168 There's a link to Sponaugle's thread in there as well. Someone really should sticky that.

Last edited by Merp; 04-04-2009 at 01:55 PM.
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Old 04-04-2009, 01:54 PM   #13
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Quote:
Originally Posted by Merp View Post
To my knowledge the ecu will work, but you ought to check the pinouts in the corresponding manuals to verify that all the sensors and controls have the same voltage ranges.

Does anyone make forged WRX pistons? Aside from a custom set, all I've found were 257 pistons listed as 257/255. That is, less dish volume than the actual 255, so you'll end up with an even higher CR running on WRX heads as you said, 8.7:1 range.

Also, I've read that the 255's combustion chamber is slightly more insensitive to the tuning strategy used than the 257's. I don't have a link, but it was in PPB.

I really wish people would stop talking out of their ass about these motors. If you don't know for sure, don't spread misinformation. The facts are here: http://forums.nasioc.com/forums/show....php?t=1667168 There's a link to Sponaugle's thread in there as well. Someone really should sticky that.
+1
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Old 04-04-2009, 04:01 PM   #14
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Quote:
Originally Posted by Merp View Post
To my knowledge the ecu will work, but you ought to check the pinouts in the corresponding manuals to verify that all the sensors and controls have the same voltage ranges since there's a 2 year gap on the equipment.

Does anyone make forged WRX pistons? Aside from a custom set, all I've found were 257 pistons listed as 257/255. That is, less dish volume than the actual 255, so you'll end up with an even higher CR running on WRX heads as you said, 8.7:1 range.

Also, I've read that the 255's combustion chamber is slightly more insensitive to the tuning strategy used than the 257's. I don't have a link, but it was in PPB.

I really wish people would stop talking out of their ass about these motors. If you don't know for sure, don't spread misinformation. The facts are here: http://forums.nasioc.com/forums/show....php?t=1667168 There's a link to Sponaugle's thread in there as well. Someone really should sticky that.

Beginning to agree, only 257 pistons. Sounds dangerous.

I'd REALLY like to run a full STi motor, complete with the 07 heads.

Merp, I appreciate your answer!

SOTC

Last edited by saab-on-the-cobb; 04-04-2009 at 04:29 PM.
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Old 04-04-2009, 06:06 PM   #15
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Yes, your ECU will control the EJ257 based engine just fine, as long as you are talking about an 04-07 STI longblock.

Clearly it would not work with the dual AVCS 08.

There are a few minor things you need to consider however. If my memory serves me right, the 06 WRX 2.5s has the air pump. If you get an STI EJ257 long block, it will not have the air pump or support for it (the head casting)..

Simple to disable the codes of course, but just so you are aware.

Other then the smog pump, the control mechanisms are the same. Obviously you will have to get a tune.

Jeff
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Old 04-05-2009, 01:23 AM   #16
saab-on-the-cobb
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Quote:
Originally Posted by sponaugle View Post
Yes, your ECU will control the EJ257 based engine just fine, as long as you are talking about an 04-07 STI longblock.

Clearly it would not work with the dual AVCS 08.

There are a few minor things you need to consider however. If my memory serves me right, the 06 WRX 2.5s has the air pump. If you get an STI EJ257 long block, it will not have the air pump or support for it (the head casting)..

Simple to disable the codes of course, but just so you are aware.

Other then the smog pump, the control mechanisms are the same. Obviously you will have to get a tune.

Jeff
Thank you!

Yes, I have the air pump. Not for long, though.

Oh, and I won't just be getting a "tune."

I'll be coming to Surgeline for a tune.

SOTC
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Old 04-05-2009, 09:08 AM   #17
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Quote:
Originally Posted by Merp View Post
To my knowledge the ecu will work, but you ought to check the pinouts in the corresponding manuals to verify that all the sensors and controls have the same voltage ranges since there's a 2 year gap on the equipment.

Does anyone make forged WRX pistons? Aside from a custom set, all I've found were 257 pistons listed as 257/255. That is, less dish volume than the actual 255, so you'll end up with an even higher CR running on WRX heads as you said, 8.7:1 range.

Also, I've read that the 255's combustion chamber is slightly more insensitive to the tuning strategy used than the 257's. I don't have a link, but it was in PPB.

I really wish people would stop talking out of their ass about these motors. If you don't know for sure, don't spread misinformation. The facts are here: http://forums.nasioc.com/forums/show....php?t=1667168 There's a link to Sponaugle's thread in there as well. Someone really should sticky that.
Thank you somebody for not posted wrong info. The 06+ wrx motors are not all that different from sti. If you think otherwise your of in fairyland or something. Thank you merp for posting correct info.
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Old 04-05-2009, 09:42 AM   #18
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Quote:
Originally Posted by Team Scream View Post
Here we go......
FUNNY ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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