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Old 10-25-2011, 09:18 AM   #1
maddhatteroo7
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Default ver 7 ej207 stock boost

What would the stock boost be for a ver7 ej207 w/vf30? Thought it was 14.5 psi but im boosting 19-20psi currently with no ebc or other mods. Makes me wonder if it was tuned possibly. Was thinking about using open ecu to flash back to stock. Thanks for the input!
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Old 10-25-2011, 10:12 AM   #2
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Stock boost on those engines is around 18-19 psi IIRC.

Ej257's run 14.5 psi stock.
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Old 10-25-2011, 07:15 PM   #3
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Thats what I kept hearing until I've talked to a local tuner here in Tokyo and figured they knew more about it. Odd thing is I'm pretty sure my ej20g was at 14.5lbs.
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Old 10-25-2011, 08:06 PM   #4
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Quote:
Originally Posted by maddhatteroo7 View Post
What would the stock boost be for a ver7 ej207 w/vf30? Thought it was 14.5 psi but im boosting 19-20psi currently with no ebc or other mods. Makes me wonder if it was tuned possibly. Was thinking about using open ecu to flash back to stock. Thanks for the input!
Remember my old bug eye rick? I think that one did 1.4 bar stock. What ever that equates to.
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Old 10-26-2011, 03:44 AM   #5
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Ok ray. I thought it was weird with it.boosting 1.6bar 19-20lbs and its not modded more than a catback currently.
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Old 10-26-2011, 08:39 AM   #6
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My ej207 peaks at 18-19 normally. Once in a while it hits 21ish. It it catless and has full exhaust including a header. I've been running it like that for 8 years with no issues.
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Old 10-26-2011, 08:45 AM   #7
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Factory boost for V5/6 EJ207 is 800 mmHg = 1.1 bar = 15.5 psi.

Last edited by Marnix; 10-27-2011 at 03:44 AM.
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Old 10-26-2011, 08:53 AM   #8
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Quote:
Originally Posted by garface View Post
My ej207 peaks at 18-19 normally. Once in a while it hits 21ish. It it catless and has full exhaust including a header. I've been running it like that for 8 years with no issues.
Quote:
Originally Posted by Marnix View Post
Factory boost is 800 mmHg = 1.1 bar = 15.5 psi.
hmmm im thinking ill reflash the ecu just incase. I wish there was actual subaru documentation available to see which models produced what amount of max boost.
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Old 10-26-2011, 09:20 AM   #9
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Stock is 18.56 PSI in my V9 JDM EJ207.
The documentation you're looking for is found in the ROM image that people pull from Stock JDM ECU.
The boost target is 18.56, I've logged 18.7 and the boost cut is over 22.4 PSI
I got 3 other images from 3 different sources and the tables were all identical.

The S cars have an even higher fuel cut, in the 23 PSi range.
Take a look at the Ej207 owners forum, there is a lot of info there, most EJ207 are after 2002.


I don't know what you are doing (You're running this engine in Tokyo/Japan or in BAIC USA), but if you're running a JDM EJ207 with mods and did not tune anything, you should run it with 100 Octane unleaded gasoline, not with 93 and certainly not with 91.

If you're looking to reflash it back to stock JDM spec, that spec is for 100 Octane gasoline that these cars are needing to run in Japan.
Prior to me getting my ECU reflashed, when I was still running it stock, waiting for the reflash, I fuelled cam 2 100 unleaded, as a temporary safety measure.

If you're running an EUdm EJ207, this is different.


Another important difference that one needs to understand is that there are quite many differences between the hardware and stock tuning of a JDM EJ207 and EUdm EJ 207. The EUdm does not run wthe boost that the JDM runs stock.
This is why you're getting two apparently contradictory answers.
There are differences in heads, coil packs, spark plugs, etctec.

Last edited by Vlad; 10-26-2011 at 12:33 PM.
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Old 10-27-2011, 03:43 AM   #10
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I misread in the first post for which EJ207 version the request was... My statement of boost levels is for V5/6 engines, not for the V7.

And V5/6 EJ207 cannot be compared with later versions. The short blocks are completely different. V7 and up have semi-closed deck blocks with MUCH tougher connecting rods, so do not try to run V7 and up boost levels on V5/6 engines, they will throw a rod!
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Old 10-27-2011, 09:26 AM   #11
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Quote:
Another important difference that one needs to understand is that there are quite many differences between the hardware and stock tuning of a JDM EJ207 and EUdm EJ 207. The EUdm does not run wthe boost that the JDM runs stock.
This is why you're getting two apparently contradictory answers.
There are differences in heads, coil packs, spark plugs, etctec.
Does the EU EJ207 run a different turbo? I see it was said that the heads are different. Is this true across the GD model years? or only from 02 to, lets say, 05?

Where I'm from, we have both JDM and EUDM and ADM cars :|

I've seen two stock JDM bugeye STi's run at 18-19 psi boost. Their redline was around 8200 or so rpm?

I've seen ONE EUDM bugeye STi run at closer to 15 psi I think, but that car also redlines at "only" 7500 rpm.

What's up with that?

As far as I recall though, both cars used similar spark plugs! Well, it may be possible that the OE heat ranges were different, but I'm not sure if the owners had changed the plugs to those different ranges, or that was in stock trim.
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Old 10-27-2011, 09:42 AM   #12
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The 207 may have started in 2001 or late 2000. I've read somewhere that late model GC8 had EJ207 in a very late Version 6.
As long as we're talking new body, beginning with 2001, the JDM had VF30 in the Sti and VF34 in the Sti Spec C.
The AUS had something else to my knowledge, probably the EU as well.

This becomes more true with newer models.
With mid year 2003, the JDM become twinscroll and the EUDM stay single scroll. Differences start to include cams and such. Turbos are twinscroll, VF 36, 37. The S cars have the very special VF42.

With 2005 the EUDM and AUS become EJ257, while the JDM stay EJ207.

A while ago, one of the board memebers analyzed the part numbers for the components. The JDM V7 were different than any otherones and just for '02, the cams for Spec C are said to have been very radical, and that later they reverted to a more "normal design" that then carried to all the V8+ twinscrolls. The V8+ Twinscroll Spec C are said to have different cams as well.
The heads are a big part of the reason, for sure.The redline is quite different, easily visible when you look on ebay at misc clusters. The JDM clearly show redline at 8000, while the rest at 7200.
The extra 200RPM are said to be only a visual reading or an innertia thing, because I've personally seen that no Subaru (not even the mighty GRB Spec C EJ207) has in the ROM the fuel cut over 8000.
In other words, let's say you're logging a run to the limitator. You hit 8000, the limitator kicks in and cuts the fuel. The engine will gain another 200rpm due to accelerative innertia, before it starts to slow down. Your log might show 8200 therefore.

I have the owner's manuals of both the JDM and EUDM. Their reccomended spark plugs are 1 range different.
The coil packs have a different part number and are revised for the different range plugs.
Doing plugs without doing coil packs doe not give you the same effect.

The reasons for the different RPM ranges can be many: Legal liabillity, Local laws about timing belt replacement interval (in Japan they are allowed to tell owners to replace every 50 K miles, while I believe that in US that is not the case).
The timing belt is a different part number, possibly with less stretch, but with more frequent replacements. Don't get me wrong, people have run and are running JDM EJ207 with USDM timing belts and the engine runs fine. But doing stuff by-the-book, you would get a different timing belt.
A big reason are the different heads.

The spec C cars got an oil radiator and no cooler.
The S cars are even more special and differ in the ROM as well.
The body/chassis is different and the weight is different.
The ratios in the gearbox from the close ratio JDM 6 speed may not have made it to export markets.

Last edited by Vlad; 10-27-2011 at 10:06 AM.
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Old 10-27-2011, 10:29 AM   #13
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I know the UKDM STi ver 7 ran a VF35 turbo and the small port heads.
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Old 10-27-2011, 10:32 AM   #14
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Vlad - you sir, are a Subaru-God. Excellent info!

So can we run the JDM EJ207 coil packs with the colder plugs for a better effect?
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Old 10-27-2011, 10:39 AM   #15
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Thanks


If you've looked at Romraider, it had a time of development and then stagnation. hardly anything new is coming out.
One of the very last things to come out was the Dwell angle table.
To do everything right, you would need:
-Plugs
-Coil packs
-Access to the dwell angle table for your ECU

The way things worked with Romraider, things became available first for certain ECu's , then for everybody. I think they stopped at "for some".

Then you copy the JDM OEM ECU image, open the dwell table, copy the whole thing and paste it into your ECU.
There might be more implications than this, a tuner would get into further detail about additional changes needing to be made, but my feeling is that at this point you'd be 99% there with the spark plugs.

Last edited by Vlad; 10-27-2011 at 10:47 AM.
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Old 10-30-2011, 11:41 PM   #16
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Quote:
Originally Posted by Vlad View Post
Thanks


If you've looked at Romraider, it had a time of development and then stagnation. hardly anything new is coming out.
One of the very last things to come out was the Dwell angle table.
To do everything right, you would need:
-Plugs
-Coil packs
-Access to the dwell angle table for your ECU

The way things worked with Romraider, things became available first for certain ECu's , then for everybody. I think they stopped at "for some".

Then you copy the JDM OEM ECU image, open the dwell table, copy the whole thing and paste it into your ECU.
There might be more implications than this, a tuner would get into further detail about additional changes needing to be made, but my feeling is that at this point you'd be 99% there with the spark plugs.
There is a version 9.. 2 liter engine????? What years?????


I have never heard about this.
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Old 10-31-2011, 09:29 AM   #17
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The talk about versions is just fan club talk, so we can understand Sti generations easier. Subaru has stopped calling them versions since version 6.

As far as Subaru is concerned, a V7 is a GD revision A. All these were revisions and the GD body has revisions A through F.

People have agreed that GDA is V7, GDB-D are V8 and GDE-F are V9.

Now, the current bodystyle, GR which may be upto revision D already is said in "Sti talk" to be V10, so far and yes, it still has an EJ207, quite improved too.

Last edited by Vlad; 10-31-2011 at 09:43 AM.
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Old 11-01-2011, 01:13 AM   #18
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Quote:
Originally Posted by Vlad View Post
The talk about versions is just fan club talk, so we can understand Sti generations easier. Subaru has stopped calling them versions since version 6.

As far as Subaru is concerned, a V7 is a GD revision A. All these were revisions and the GD body has revisions A through F.

People have agreed that GDA is V7, GDB-D are V8 and GDE-F are V9.

Now, the current bodystyle, GR which may be upto revision D already is said in "Sti talk" to be V10, so far and yes, it still has an EJ207, quite improved too.
I guess i need to check my lens prescription. i must be mistaken on what i initially read.


In any event, google is your friend, simply type in your shortblock and heads and you will get your answers.
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Old 11-01-2011, 07:53 AM   #19
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Yeh, just go to Subaru's Japanese site and look at the spec C, the EJ207 is clearly shown in the features, it's still around. These days with dual AVCS and more closed deck than the EJ257.
The regular Sti doesn't have it though.
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Old 11-01-2011, 01:34 PM   #20
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Guys 2005 my is considered ver.9
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Old 11-05-2011, 04:10 AM   #21
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Im in tokyo... On base gas is midgrade and thats all we have. Off base is significantly more expensive for hi-octane (200/liter)
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Old 11-05-2011, 07:55 AM   #22
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Quote:
Originally Posted by Vlad View Post
The talk about versions is just fan club talk, so we can understand Sti generations easier. Subaru has stopped calling them versions since version 6.

As far as Subaru is concerned, a V7 is a GD revision A. All these were revisions and the GD body has revisions A through F.

People have agreed that GDA is V7, GDB-D are V8 and GDE-F are V9.

Now, the current bodystyle, GR which may be upto revision D already is said in "Sti talk" to be V10, so far and yes, it still has an EJ207, quite improved too.

In what way? I thought the only changes were the addition of smog devices, and no other additions to increase power or power band were added?
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Old 11-05-2011, 07:56 AM   #23
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Quote:
Originally Posted by maddhatteroo7 View Post
Im in tokyo... On base gas is midgrade and thats all we have. Off base is significantly more expensive for hi-octane (200/liter)
What is it, 76 yen to the dollar these days?
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Old 11-05-2011, 07:59 AM   #24
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Off base and on base might be coded differently. You surely understand the differences between MON, RON and AKI.
Wikipedia has definitions, I don't have time to go there now.
If you want an USDM tune for 91, then you may be able to use a mid-grade gasoline.
Other than that, talk to the local tuners and ask them what they tank..
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Old 11-05-2011, 08:45 AM   #25
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What is it, 76 yen to the dollar these days?
75-78(78 on a good day) at least my cola went up and i dont buy **** out in town much other than a train ticket

Quote:
Originally Posted by Vlad View Post
Off base and on base might be coded differently. You surely understand the differences between MON, RON and AKI.
Wikipedia has definitions, I don't have time to go there now.
If you want an USDM tune for 91, then you may be able to use a mid-grade gasoline.
Other than that, talk to the local tuners and ask them what they tank..
I'm aware of the different octane rating schemes from most countries. I've even asked the locals working at the gas stations on base and even in Okinawa (been there too) the gas supplier was a japanese company so ours is the same as off base. I would like to get details as to what specific octane rating it is just to kill my curiosity.
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