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Old 12-15-2010, 02:31 AM   #1
stiferko
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Default JDM EJ20 V7 and V8

i am looking to do the swap in my 02 wrx, and i know all that is involved...

my question is, is the v8 as capatable as the v7?
whats the difference between the 2?
can i for the most part, plug and play it the same way?


thanks!
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Old 12-15-2010, 05:46 AM   #2
KenSekiguchi
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Well, since you have an 02' WRX, the swap should be very straight forward with the exception of wiring the AVCS which isn't too difficult, for the most part it is all plug and play. The V7 EJ207 came with full forged internals where the V8 EJ207 came with hyperueritic internals. Both the V7 and V8 EJ207's are monsters when compared to our USDM counterparts in terms of absolute reliability, driveability, the amount of abuse taken, and the fun factor on both of the V7 and V8 is very high even when stock.
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Old 12-15-2010, 07:07 AM   #3
stiferko
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so the v7 and v8 are the same as far as the wiring? both plug and play? + wiring of the avcs
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Old 12-15-2010, 01:41 PM   #4
Britain
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Yes, both are the same. The V8 had a intake temp sensor so one extra wire. If you get the V8 Spec-C then you don't have to deal with the TGV's.

-Britain
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Old 12-16-2010, 11:02 AM   #5
stiferko
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where would the temp sensor run to?
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Old 12-17-2010, 12:13 PM   #6
RiskySeven
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AFAIK, your ECU won't know what to do w/ AVCS, you'll need a JDM ECU. If you are worried about emissions, some states can't read JDM ECUs...some apparently can.

http://www.iaperformance.com/product...oducts_id=2580
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Old 12-17-2010, 02:55 PM   #7
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Quote:
Originally Posted by Britain View Post
If you get the V8 Spec-C then you don't have to deal with the TGV's.

-Britain
Not sure what you mean here, but the regular JDM V8 motor doesn't have TGVs either.

To the OP:
The basic wiring is the same between the V7 and V8 motors as far as getting the AVCS working is concerned. IA Performance has an AVCS wiring kit to make the job easier.
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Old 12-18-2010, 01:20 AM   #8
stiferko
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i know how to wire it up and everything, that isnt the problem at all... i was just originally looking into the V7 and have been finding alot of good deals on v8's so i was wondering if the v8 was the same as far as wiring and installation
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Old 12-19-2010, 05:11 AM   #9
12.9$500rex
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Quote:
Originally Posted by RiskySeven View Post
AFAIK, your ECU won't know what to do w/ AVCS, you'll need a JDM ECU. If you are worried about emissions, some states can't read JDM ECUs...some apparently can.

http://www.iaperformance.com/product...oducts_id=2580
So anyone know emissions info on the JDM v7 & v8? Who has passed with these swaps and in what states? Anyone pass in IL?
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Old 12-19-2010, 05:12 AM   #10
12.9$500rex
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Quote:
Originally Posted by RiskySeven View Post
AFAIK, your ECU won't know what to do w/ AVCS, you'll need a JDM ECU. If you are worried about emissions, some states can't read JDM ECUs...some apparently can.

http://www.iaperformance.com/product...oducts_id=2580
So anyone know emissions info on the JDM v7 & v8? Who has passed with these swaps and in what states? Anyone pass in IL?
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Old 12-19-2010, 05:13 AM   #11
12.9$500rex
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delete

Last edited by 12.9$500rex; 12-19-2010 at 06:14 AM. Reason: repeat post
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Old 12-19-2010, 11:15 AM   #12
02 Scoob-TN
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I easily passed here in nashville,TN. Our test consists of scanning the ECU for trouble codes and readiness monitors, visual inspection of gas door inlet plug, etc. I have a version 8 longblock with the matching JDM ECU with AVCS hooked up and all.
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Old 12-19-2010, 12:32 PM   #13
prokaw875
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Quote:
Originally Posted by Britain View Post
Yes, both are the same. The V8 had a intake temp sensor so one extra wire. If you get the V8 Spec-C then you don't have to deal with the TGV's.

-Britain
Any version 8 you dont have to deal with TGV`s. Alot of people think there is a big difference between the Version 8 Spec-C and Standard Version 8 STi like intake, header, blah blah but there really is not. Cams are different, ECU is a tad bit more agressive, and thats about it engine wise. Version 7 has TGV valves, Version 7 spec-c/ra-c do NOT since they recived the later V7/8 big port heads and matching tgvless intake
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Old 12-19-2010, 12:41 PM   #14
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Quick rundown of what you need for the swap...
Complete EJ207 $4000-5000 complete w/ecu and harness
IA Performance AVCS Harness $200?
Stock downpipe

or

Ia performance twin scroll flange $90
Ebay downpipe bellmouth $150
Custom made twin scroll downpipe $150

Walbro 255 $100
Drivetrain swap or ACT HDSS clutch $400-4000

thats about it for putting a 207 in a wrx
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Old 12-19-2010, 02:39 PM   #15
stiferko
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i was leaning more towards the v8 lately because of the twin scroll...

i dont know which one to go with
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Old 12-19-2010, 04:56 PM   #16
Ryan23
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Quote:
Originally Posted by prokaw875 View Post
Any version 8 you dont have to deal with TGV`s. Alot of people think there is a big difference between the Version 8 Spec-C and Standard Version 8 STi like intake, header, blah blah but there really is not. Cams are different, ECU is a tad bit more agressive, and thats about it engine wise. Version 7 has TGV valves, Version 7 spec-c/ra-c do NOT since they recived the later V7/8 big port heads and matching tgvless intake
None of the JDM Motors have TGV valves. Regular STi have the empty TGV housings. Spec-C have the full length runners (TGV-housing-less). All JDM heads are also "big-port".

OP: Main difference: Ver 7 is single scroll, VF30/34 with AVCS.
Ver 8 is twin scroll, VF36/37 with AVCS. If you are going to run the original turbo/header, go with the twin scroll setup provided the cost between the two are close. There are some differences between the two engines but nothing you would probably ever notice.

Ryan
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Old 12-19-2010, 05:14 PM   #17
12.9$500rex
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So anyone have IL emissions experience with this swap?
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Old 12-19-2010, 06:34 PM   #18
stiferko
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im looking to make about 350awhp.... will the OEM twin scroll meet these needs?

im not looking to build a motor, so not sure which would be my best bet
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Old 12-19-2010, 07:47 PM   #19
Ryan23
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Quote:
Originally Posted by stiferko View Post
im looking to make about 350awhp.... will the OEM twin scroll meet these needs?

im not looking to build a motor, so not sure which would be my best bet
Pretty close on race gas. Close enough that I go with the stock setup for OEM reliability and spool. When you get bored with that, than think about upgrading.

Ryan
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Old 12-19-2010, 07:55 PM   #20
stiferko
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would the v8 be as capable? being that it doesnt have as good built bottom end as the v7?

i figure with a good tune, fuel system, and the right bolt ons... it shouldnt be a too outrageous of a target to hit...
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Old 12-20-2010, 01:50 AM   #21
FuJi K
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why do you all make it seem to hard to put in a AVCS motor?

Stick that longblock in and don't run AVCS. Ver7 STi not big port, Ver7 Spec C is big port.
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Old 12-20-2010, 03:30 AM   #22
Ryan23
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Quote:
Originally Posted by FuJi K View Post

Ver7 STi not big port, Ver7 Spec C is big port.
I've got a set of heads sitting on an engine here in my living room that beg to differ I have yet to see a set of small port heads here in Japan. Incidentally, the Subaru FAST CD lists the same P/N for the heads, Spec C or otherwise.

Ryan
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Old 12-20-2010, 04:41 AM   #23
FuJi K
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Quote:
Originally Posted by Ryan23 View Post
I've got a set of heads sitting on an engine here in my living room that beg to differ I have yet to see a set of small port heads here in Japan. Incidentally, the Subaru FAST CD lists the same P/N for the heads, Spec C or otherwise.

Ryan
what trim did that head come off of? if thats the case then bugeye ver7 "EJ207" motors that have been sold back in the day must have been AUS/EDM motors listed as "JDM." Forester STi EJ255 has small ports. Tomei has R&D on that head, which isn't an EJ207 head BUT is there in Japan.
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Old 12-20-2010, 07:39 PM   #24
Ryan23
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Quote:
Originally Posted by FuJi K View Post
what trim did that head come off of? if thats the case then bugeye ver7 "EJ207" motors that have been sold back in the day must have been AUS/EDM motors listed as "JDM." Forester STi EJ255 has small ports. Tomei has R&D on that head, which isn't an EJ207 head BUT is there in Japan.
I haven't looked at any Forester EJ255s up close, so you got me there Every once in awhile they pop up for sale but nowhere near the frequency of GDB engines.

My heads came off a EJ207DW3CJ in a Ver 7 RA (non-Spec C). They have the deep splitter. Granted, they have been ported



Ryan
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Old 12-20-2010, 08:41 PM   #25
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Was thinking about this post in the shower Just to clear up any potential misconception, that pic was not insinuating the port entry is any larger. Just using the calipers as a point of reference vice the obscure "large socket"

Ryan
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