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Old 03-16-2021, 08:00 AM   #1351
johnfelstead
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I run 20% methanol with super unleaded pump fuel (your 93 octane) when competing and on a trackday. I can run up to 6 degrees more ignition compared to plain pump fuel which picks up 20% torque.

Methanol is really good at knock suppression and cylinder cooling. My engine is running 9.3:1 compression and circa 475BHP/520LbFt on a 2.1 with Mahle Motorpsort 2618 pistons. The high compression really loves high octane fuel blends.
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Old 03-16-2021, 11:46 AM   #1352
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EJ207 Version 8, spark plugs, Autolite Iridium XP.

For those who prefer Autolite Iridium XP this is OEM replacement: "Autolite XP3923 Iridium XP"
&
1-step colder is "Autolite XP3922"
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Old 03-17-2021, 09:28 AM   #1353
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Quote:
Originally Posted by kgozi View Post
EJ207 Version 8, spark plugs, Autolite Iridium XP.

For those who prefer Autolite Iridium XP this is OEM replacement: "Autolite XP3923 Iridium XP"
&
1-step colder is "Autolite XP3922"
Definitely wouldn't run anything but NGK plugs.
Stock v8/v9 =BKR7EIX
One step colder = BKR8EIX
IA performance carries them @ about $9 a piece.
I was able to install them and get tuned without adjusting the gap. Mind you this is on a fairly stock setup (turbo back/3 port ebcs).
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Old 03-17-2021, 10:26 AM   #1354
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You can order them just about anywhere too , iirc standard plug on a Honda S2000 and a bunch of VWs
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Old 03-17-2021, 12:17 PM   #1355
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I've been using NGK PFR7B gaped at 0.7mm in JDM EJ207 for 2 decades. They last forever.
I'm not a fan of Iridium plugs.
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Old 03-17-2021, 12:19 PM   #1356
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Quote:
Originally Posted by TwistedAxles101 View Post
Definitely wouldn't run anything but NGK plugs.
Stock v8/v9 =BKR7EIX
One step colder = BKR8EIX
IA performance carries them @ about $9 a piece.
I was able to install them and get tuned without adjusting the gap. Mind you this is on a fairly stock setup (turbo back/3 port ebcs).

Some people dont like NGK, im one of them. Also, my local tuner doesn't like them either. I shared the item ID in-incase someone is looking for them.

Autolite iridium is very well designed, their warranty is extensive as well. I used NGK for years and I'm happier with the Autolite Iridium XP.

Its all preference, use what makes you more comfortable. This is just like deciding between engine oil.



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Old 03-18-2021, 01:22 AM   #1357
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Quote:
Originally Posted by johnfelstead View Post
I've been using NGK PFR7B gaped at 0.7mm in JDM EJ207 for 2 decades. They last forever.
I'm not a fan of Iridium plugs.


Agree

I even run the copper versions for e85 and they work better than iridiums - particularly because you shouldn’t gap iridiums down for risk of breaking the electrode.

Mick
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Old 04-01-2021, 06:50 PM   #1358
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The info in this thread is outstanding... Way to go vlad

Last edited by wrxmaster617; 04-02-2021 at 07:14 AM.
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Old 04-06-2021, 11:24 AM   #1359
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So, I discovered yesterday that one of my cams was broken on the v9 heads I planned on using for my build. Does anyone know if these RCM Spec C cam would be a direct drop in replacement or would I need to changed out the buckets?...
https://rogerclarkmotorsport.co.uk/s...-kit-sti-v7-v9
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Old 04-06-2021, 01:25 PM   #1360
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Quote:
Originally Posted by murrdogg24 View Post
So, I discovered yesterday that one of my cams was broken on the v9 heads I planned on using for my build. Does anyone know if these RCM Spec C cam would be a direct drop in replacement or would I need to changed out the buckets?...
https://rogerclarkmotorsport.co.uk/s...-kit-sti-v7-v9
You will have to change the buckets to set the clearances as required. You do with any top end rebuild where you cut the valve seats or refresh the valve seal or change the cam.
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Old 04-08-2021, 09:06 PM   #1361
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A little confused by this, when talking about the differences in the v8:

“The exhaust is completely different/incompatible with the USDM WRX/Sti, all the way from the header to the downpipe. It can be replaced by a USDM exhaust, the USDM does bolt up to the block.”

Simply put does this mean that usdm and jdm headers are interchangeable? I understand that the up pipe and down pipe are different in the v8.
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Old 04-08-2021, 11:25 PM   #1362
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Quote:
Originally Posted by Blubaru03x View Post
A little confused by this, when talking about the differences in the v8:

"The exhaust is completely different/incompatible with the USDM WRX/Sti, all the way from the header to the downpipe. It can be replaced by a USDM exhaust, the USDM does bolt up to the block."

Simply put does this mean that usdm and jdm headers are interchangeable? I understand that the up pipe and down pipe are different in the v8.
it should bolt right up, but I know the downpipe on the jdm is like 2 inches shorter than the UDSM one
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Old 04-08-2021, 11:28 PM   #1363
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Quote:
Originally Posted by murrdogg24 View Post
So, I discovered yesterday that one of my cams was broken on the v9 heads I planned on using for my build. Does anyone know if these RCM Spec C cam would be a direct drop in replacement or would I need to changed out the buckets?...
https://rogerclarkmotorsport.co.uk/s...-kit-sti-v7-v9
yes they don't give any specs on the cams so its hard to say.. I would change all four though you could run into some weird problems if the have different specs
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Old 04-09-2021, 06:43 AM   #1364
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Quote:
Originally Posted by Blubaru03x View Post
A little confused by this, when talking about the differences in the v8:



“The exhaust is completely different/incompatible with the USDM WRX/Sti, all the way from the header to the downpipe. It can be replaced by a USDM exhaust, the USDM does bolt up to the block.”



Simply put does this mean that usdm and jdm headers are interchangeable? I understand that the up pipe and down pipe are different in the v8.


JDM v8 was twin scroll ELH so if you use this setup you have to use compatible parts through the down pipe. Otherwise you can swap everything out for OEM style single scroll like the v7 /USDM variants.
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Old 04-09-2021, 08:20 AM   #1365
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Ver8 JDM STi oem down pipe is short but the the donut junction is identical to a oem usdm. In order to use a usdm catback the intermediate pipe or what people here call the mid pipe has to be lengthened. Or, buy an aftermarket twin scroll down pipe that is usdm lenght and a usdm catback will bolt up without the need to lengthen a usdm intermediate pipe to use whatever catback it is you want to use. The same thing applies if trying to use a jdm STi ver 7 oem down pipe, they are too short also. A single scroll usdm lenght down pipe allows for the use of any usdm catback. Ver 9 JDM STi oem down pipes are long as a usdm down pipe and can be used on a ver 8 twin scroll setup allowing the use of any usdm catback without having to lengthen the intermediate pipe.
A ver 8 and 9 can be converted from twin scroll to single scroll turbo, everything exhaust related usdm bolts right up and there is no need to lengthen the intermediate pipe.
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Old 04-09-2021, 11:57 AM   #1366
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Quote:
Originally Posted by D-Rodman View Post
Ver8 JDM STi oem down pipe is short but the the donut junction is identical to a oem usdm. In order to use a usdm catback the intermediate pipe or what people here call the mid pipe has to be lengthened. Or, buy an aftermarket twin scroll down pipe that is usdm lenght and a usdm catback will bolt up without the need to lengthen a usdm intermediate pipe to use whatever catback it is you want to use. The same thing applies if trying to use a jdm STi ver 7 oem down pipe, they are too short also. A single scroll usdm lenght down pipe allows for the use of any usdm catback. Ver 9 JDM STi oem down pipes are long as a usdm down pipe and can be used on a ver 8 twin scroll setup allowing the use of any usdm catback without having to lengthen the intermediate pipe.
A ver 8 and 9 can be converted from twin scroll to single scroll turbo, everything exhaust related usdm bolts right up and there is no need to lengthen the intermediate pipe.
Forgot to mention I have an 03 wrx, my down pipe will fit the v7.

As far as my down pipe fitting the v8, isn’t the bell mouth bolt pattern different? Or is it that the location of the vf36 turbo is pushed back in the ej207 and that’s why the jdm down pipe is shorter? I’m prepared to use a jdm bell mouth or eBay vf36 bell mouth welded to my down pipe.

I mainly asked my first question because I have ported oem headers on my 03 and would want to keep them for the build (if I ever get to it lol)

Last edited by Blubaru03x; 04-09-2021 at 12:35 PM.
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Old 04-09-2021, 03:11 PM   #1367
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You cant use single scroll headers and up pipe with a twin scroll turbo.

The stock JDM twin scroll header setup is very good.

The outlet flange design on a twin scroll is also different to single scroll.

Basically the header/up pipe/turbo in/turbo/turbo out is all designed physically differently to a single scroll system and must be used as a matched system as a whole.
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Old 04-09-2021, 03:16 PM   #1368
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Yeah I was wondering about using the stock v9 STI valves/springs/retainers with this cam set. Not sure if the JDM Hawkeye Spec C got different components in addition to the cams.
Quote:
Originally Posted by subaru_gc8 View Post
yes they don't give any specs on the cams so its hard to say.. I would change all four though you could run into some weird problems if the have different specs
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Old 04-09-2021, 05:48 PM   #1369
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Quote:
Originally Posted by johnfelstead View Post
You cant use single scroll headers and up pipe with a twin scroll turbo.

The stock JDM twin scroll header setup is very good.

The outlet flange design on a twin scroll is also different to single scroll.

Basically the header/up pipe/turbo in/turbo/turbo out is all designed physically differently to a single scroll system and must be used as a matched system as a whole.

That's what I was thinking. Thanks for all the info guys



And if i get the longblock ej207 it will come with the header and up pipe anyway.



But going off what Vlad said in the original post is still a little confusing: "It can be replaced by a USDM exhaust, the USDM does bolt up to the block.
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Old 04-10-2021, 03:44 PM   #1370
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You can bolt any system to any Subaru EJ20 DOHC engine, you just have to match the parts as a set when you do so.
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Old 04-10-2021, 10:11 PM   #1371
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Quote:
Originally Posted by murrdogg24 View Post
Not sure if this is the same as the JDM EJ207....
https://www.flatironstuning.com/genu...embly-gdb-v7-8
Question:

What would the compression ratio wind up being running this short block with EJ205 USDM cylinder heads?
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Old 04-11-2021, 03:25 PM   #1372
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Default EJ207 Info

Trying to diagnose a high rpm stumble. If it would be better to create a new thread let me know. Posting here since I have a 207 and I've addressed most of the usual suspects.

Basically, right at 7200 (visual on the tach, not sure if that lines up with true engine speed but should be close), the engine starts to stumble and not want to keep climbing through the rev range. Changed crank pos sensor and all ignition coils with new OEM. Previous coils were OEM as well. Checked plugs. All wearing evenly and no signs or burning rich or lean on any cyl. Plugs were new right before tune last November (BKR7EIX) and gapped to .028". MAF has about 20k miles in it and was cleaned before tune. New OEM flywheel when I did engine and trans swap last summer. At the time of tuning, AVCS appeared to be working properly. When the tune was done my tuner mentioned that it would go rich at 7000 which can be seen in the dyno chart.

https://forums.nasioc.com/forums/sho....php?t=2923312
Post #39

I wasn't having any stumbling issues at the time and the tuner wasn't really helpful with suggestions other than possibly ignition coils. Those coils had about 20k on them.

No CELs, idles smooth, drives smooth up to 7200. Haven't taken it above 6000 other than after replacing the coils and CPS to see if I still had the issue. Planning on replacing both O2 sensors this week as I don't know when they were done last. Thoughts or ideas on where to look next? FPR? Cam pos sensors? Alternator? Not sure if current one is OEM or not. Can't read the plaque on it.

Other items changed during swap:
New ID 1050x injectors
Older version Perrin fuel rails with new fuel lines
New Walbro 255 pump and filter
New starter/battery grounds. Made grounding kit for both heads as well
Odyssey PC925 2 years old

Edit:
I've been starting to wonder if it's potentially the wrong heat range plug for my application. But I've been seeing mixed info on what plugs came from the factory on the v7. Most info I've found references PFR7 heat range but some threads have mentioned PFR/BKR6 which I know was for the EJ205. Could I be having issues with the 7 series heat range and should have 8?

Last edited by snow_bound26; 04-11-2021 at 07:28 PM.
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Old 04-12-2021, 10:18 AM   #1373
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Anyone got the part number for a V9 LH exhaust camshaft? I'm trying to see if I can order one from Japanparts.com but there's like 3 different parts for the EJ207.
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Old 04-12-2021, 10:45 AM   #1374
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Quote:
Originally Posted by murrdogg24 View Post
Anyone got the part number for a V9 LH exhaust camshaft? I'm trying to see if I can order one from Japanparts.com but there's like 3 different parts for the EJ207.


Contact iATuning. They may even have it in stock.
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Old 04-12-2021, 11:08 AM   #1375
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I called and they say call Rallispec...

Called Rallispec and they can get it from Japan but I would have to pay additional shipping from Rallispec to me so I'd rather cut out the middle man and buy direct from Japanparts.

So I am guessing I need #221 as seen on Japanparts

If I have to spend over $500 on a single cam I think I'll just pony up $1k and buy the RCM spec c set.



Quote:
Originally Posted by snow_bound26 View Post
Contact iATuning. They may even have it in stock.

Last edited by murrdogg24; 04-12-2021 at 12:50 PM.
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