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Old 10-13-2012, 01:58 PM   #1
canadiansnoobie
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Default 96 JDM GC8 EJ20 WRX vs STI

I have a 96 JDM WRX. I killed the engine becouse of some extremely aggressive driving.. So I pulled the engine and set it aside to be rebuilt at a later date. I bought a 96 JDM STI engine with tranny, ecu and wiring. My plan is to install the STI engine into my car. What else might I need for this installation? Is everything else pretty much the same from the 96 WRX to the 96 STI?

Any help or suggestions will be greatly appreciated. Or perhaps point me to a thread that already has the information that i'm looking for
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Old 10-13-2012, 02:41 PM   #2
AgentJ17
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As long as it is the same model of motor should be no wiring or any other issues. 96 is the year they switched from the EJ20G to the EJ20K. Easy to distinguish the two from each other. EJ20K has single ignition coil on the intake manifold and EJ20G has coil-over-plug. Otherwise, the STi EJ20G may only vary from the WRX EJ20G IF it has forged internals. Can't say what the differences between the WRX and STi EJ20K. I know they at least have different turbos from each other.
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Old 10-14-2012, 12:17 AM   #3
Marnix
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To be sure you won't run into surprises just swap the intake manifold from your engine onto the new one. The ECU is also just plug and play in your car. But be careful, the STI has pretty aggressive ignition timing which wil kill your engine (again) on non-Japanese fuel.
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Old 10-15-2012, 12:55 AM   #4
canadiansnoobie
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I usually run 94 octane. what octane is the fuel in japan.
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Old 10-15-2012, 08:00 AM   #5
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When your car was new (and the STI) it would have been 97 RON but I think Canada (guessing you're canadian from your user name?) uses the same system for fuel ratings as the US.
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Old 10-15-2012, 10:37 AM   #6
canadiansnoobie
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I think the US/Canada 91 AKI is comparable to the 97 RON in Japan. but I'm not sure so don't quote me on that
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Old 10-16-2012, 12:25 AM   #7
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Quote:
Originally Posted by canadiansnoobie
I think the US/Canada 91 AKI is comparable to the 97 RON in Japan. but I'm not sure so don't quote me on that
**** no. Not even close.
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Old 10-16-2012, 01:01 AM   #8
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I'm running chevron 94 (as its the only non ethanol 94 i can find locally) its whats been run thru the car since it came here in late 2010, i've put appx 10k kms on the car since I purchased it last year no issues so far when i have to run 91 i drive it gently and hear no knock or pinging.
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Old 10-16-2012, 05:45 PM   #9
canadiansnoobie
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Quote:
Originally Posted by i_c_the_light View Post
**** no. Not even close.

Enlighten us then.
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Old 10-16-2012, 05:53 PM   #10
canadiansnoobie
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Quote:
Originally Posted by i_c_the_light View Post
**** no. Not even close.
I found the info.. all good

United States: in the US octane rating is displayed in AKI. In the Rocky Mountain (high elevation) states, 85 AKI (90 RON) is the minimum octane, and 91 AKI (95 RON) is the maximum octane available in fuel. The reason for this is that in higher-elevation areas, a typical Naturally aspirated engine - Wikipedia, the free encyclopedia draws in less air mass per cycle because of the reduced density of the atmosphere. This directly translates to less fuel and reduced absolute compression in the cylinder, therefore deterring knock. It is safe to fill a carbureted car that normally takes 87 AKI fuel at sea level with 85 AKI fuel in the mountains, but at sea level the fuel may cause damage to the engine. A disadvantage to this strategy is that most turbocharged vehicles are unable to produce full power, even when using the "premium" 91 AKI fuel. In some east coast states, up to 94 AKI (98 RON) is available. As of January, 2011, over 40 states and a total of over 2500 stations offer Ethanol - fuel with 105 AKI. Often, filling stations near US racing tracks will offer higher octane levels such as 100 AKI
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Old 10-16-2012, 06:13 PM   #11
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why did you blow your engine?
you ran low octane fuel, in a relative sense, regardless of the **** slinging about domestic fuels.
you have 440cc injectors that are quickly rivaled by the 450+cfm capacity of the 16g.
your injectors as you see are targeting low 10s for afr, indicating high idc
your wgdc targets modest and somewhat appropriate boost levels for your timing and fuel
your timing is nearly 30 frickin peak, on PUMP GAS, I ran 30 on e85 and was having spark blowout due to cylinder pressure.



modify anything, especially boost (which everyone does and thinks its ok), is a sure fire way to strech a bolt or crush a bearing
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Old 10-16-2012, 06:39 PM   #12
canadiansnoobie
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I buggered my engine on a gymkhana course. I pushed my car way to hard. Completely my own fault. After parking it I found that I don't have any compression in cylinder 2. And my rear main seal went as well which buggered up my clutch. When I get around to it i'll get the head off and find out if its valve or rings. Personally i think its rings due to the amount of grey blue smoke coming out of my exhaust when it happened..
I guess thats the price of a little too much fun..
But no worries. The 96 STI engine is on its way and will be in my car soon and my soob will be back on the road and no more pushing it on gymkhana courses..
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Old 10-18-2012, 03:08 AM   #13
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Rings don't let go, pistons do. Especially when mixture is not properly controlled or run on wrong gas.

I ran an EJ20G in my Legacy around the most demanding track in the world (The Norschleife of The Nürburgring) for 200 laps in one year (200 laps = over 4000 km) beating the crap out of it and it never missed a beat, nor had any problems with smoke or bearings. Just ran 100 RON fuel (Aral Optimum).
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Old 10-18-2012, 10:59 AM   #14
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We dont have anything thats close to 100 RON fuel.
EJ20K's are very prone to spinning bearings over here when used with much lower octane and high boost.
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Old 10-18-2012, 04:24 PM   #15
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Quote:
Originally Posted by Marnix View Post
I ran an EJ20G in my Legacy around the most demanding track in the world (The Norschleife of The Nürburgring)
that is extremely debatable, plenty of difficult tracks all over the globe.

OP, do you have some pics of your set-up? I recently acquired a 97 RHD STi w/ a full 05 swap and am curious to see what your's looks like.
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Old 10-20-2012, 03:25 PM   #16
canadiansnoobie
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Default Vacuum hoses

Does anyone have a diagram of the vacuum lines for the intake and turbo of the 96 ej20 sti. When i put my engine in I want to make sure I hook all the lines up properly. a diagram or some pics would help big time.
or point me to a thread that already has this..

thanks
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Old 10-20-2012, 03:28 PM   #17
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Quote:
Originally Posted by canadiansnoobie
Does anyone have a diagram of the vacuum lines for the intake and turbo of the 96 ej20 sti. When i put my engine in I want to make sure I hook all the lines up properly. a diagram or some pics would help big time.
or point me to a thread that already has this..

thanks
Hey I don't know if the EJ205 is the same but I can send you some photos if you want! Shoot me a pm
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Old 10-21-2012, 02:09 AM   #18
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Quote:
Originally Posted by dub kllr View Post
that is extremely debatable, plenty of difficult tracks all over the globe.
True. But although they (Laguna Seca, Bathurst, Spa-Francorchamps etc) may come close, none of them can match the Nordschleife regarding difficulty (over 70 corners, steep blind crests etc) and how demanding it is for both car and driver.
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Old 10-21-2012, 08:42 AM   #19
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Quote:
Originally Posted by Marnix
True. But although they (Laguna Seca, Bathurst, Spa-Francorchamps etc) may come close, none of them can match the Nordschleife regarding difficulty (over 70 corners, steep blind crests etc) and how demanding it is for both car and driver.
I think it's time to lay off the kool-aid bro.
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Old 10-21-2012, 05:03 PM   #20
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a pair of nobodies are arguing with marnix over the difficulty of 'Ring.
one is from the ****hole of america and the other from the backwards kiwi island

oh man
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Old 10-22-2012, 10:44 AM   #21
canadiansnoobie
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Quote:
Originally Posted by eg33GC View Post
a pair of nobodies are arguing with marnix over the difficulty of 'Ring.
one is from the ****hole of america and the other from the backwards kiwi island

oh man


Ya i know.... I started this thread to get info for putting an STI engine in my car.. Not for talking about tracks.
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Old 10-22-2012, 11:51 AM   #22
SlowTrackImpreza
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just to clear some things up about gasoline ratings

Japan uses RON, which is Research Octane Number

US/Canada use (MON+RON)/2 , where MON is Motor Octane Number

the MON test is done at a couple thousand RPM so the MON is typically about 7 or 8 points below the same gas testing on RON.

sooooo...remember algebra in school

knowing the RON for your motor in Japan used 97 that is (90+97)/2 = X

assuming MON is ONLY 7 points less averaged, X is 93.5 octane
assuming MON is 8 points less averaged X is 93 octane


so with this being said.....you should only use shell gasoline 93 octane, its the only gas shown to consistently test higher than the advertised rating...sometimes as high as 96 here in Virginia.

one thing to remember though, now that it is winter, I know in the United States we use a winter blend for both ethanol AND Gasoline....we mix 10%ethanol, up to 3% butane with the gas. This reduces the knock resistance. I would find out if Canada does this as well and use an octane booster.


just my .02
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Old 10-22-2012, 12:53 PM   #23
canadiansnoobie
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Thanx for the info.. That was very usefull
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Old 10-22-2012, 01:50 PM   #24
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Quote:
Originally Posted by eg33GC View Post
a pair of nobodies are arguing with marnix over the difficulty of 'Ring.
one is from the ****hole of america and the other from the backwards kiwi island

oh man
Where am I arguing with Marnix again? Just picking up a slight hint of fanboism with a sprinkling of defensiveness.
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Old 10-22-2012, 06:10 PM   #25
blessthekellen
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SlowTrack. Good info.
I went over this when I was deciding whether or not to purchase a Version4 with the EJ20k.

Here in Canada, we use ethanol. Alberta here it is Husky 94 w/ 10% ethanol.
Shell/Petro here uses 91 Octane w/ no ethanol.

A lot of JDM owners here have beat to death on which is better for our engines.
When I had my Version 2 WRX with the EJ20G & Robs 440 tune. I received much more knock response with Shell 91 than I did with Husky 94.


Honestly because Shell is such a lower octane than Husky here, I would never run anything but Husky 94 in an EJ20k.
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