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Old 10-02-2011, 11:16 PM   #1
JPN4
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Default Tuning or chipping a V6 EJ207

Have probably one of the biggest head aches for a tuning solution for my V6 sti. If anyone has any info on tuning for this car that would be awesome.
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Old 10-02-2011, 11:35 PM   #2
69subaru360
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Put a usdm wrx intake manifold and harness on it.

There's also link and power fc, hydra should work too.
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Old 10-03-2011, 12:40 PM   #3
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yeah you can go PowerFC.

or convert to USDM WRX since there is no AVCS to deal with. then you could just do an accessport or open tune
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Old 10-03-2011, 01:06 PM   #4
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In Europe they can be Ecutek'ed...
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Old 10-17-2011, 12:03 PM   #5
da_coolest
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Sorry for hijacking the thread. But I also have the same engine and the same question as well! I asked few people about the Power FC and most of them told me to get something like haltech instead of power fc and power fc is not good enough. But still theres a huge price difference between those two. Can someone please clarify what would I miss if i buy the power fc instead of the haltech?
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Old 10-17-2011, 12:06 PM   #6
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Quote:
Originally Posted by da_coolest View Post
Sorry for hijacking the thread. But I also have the same engine and the same question as well! I asked few people about the Power FC and most of them told me to get something like haltech instead of power fc and power fc is not good enough. But still theres a huge price difference between those two. Can someone please clarify what would I miss if i buy the power fc instead of the haltech?
Knock control. The power fc can not retard timing in response to knock.
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Old 10-17-2011, 12:22 PM   #7
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and to do real tuning with a PowerFC you need a datalogit interface ($350) or a tuner with the real Apexi interface (doubt theres too many of those if any in the USA)

Another option is the ViPEC but it costs more, about $1700. However, it is newer and more advanced and has direct USB connectivity

Last edited by elislider; 10-17-2011 at 12:32 PM.
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Old 11-03-2011, 03:52 PM   #8
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Its that simple? Just swap only the Intake Manifold and harness from a WRX? Would the STI Intake and harness work the same? Would you have to swap the WRX/.STI COP with it?

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Originally Posted by 69subaru360 View Post
Put a usdm wrx intake manifold and harness on it.

There's also link and power fc, hydra should work too.
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Old 11-03-2011, 03:59 PM   #9
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Quote:
Originally Posted by darkcrave View Post
Its that simple? Just swap only the Intake Manifold and harness from a WRX? Would the STI Intake and harness work the same? Would you have to swap the WRX/.STI COP with it?
It's that simple. Yeah you'd need the COP too.

USDM sti is more work with DBW and all.
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Old 11-03-2011, 05:01 PM   #10
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But if your using the Whole STI harness and ecu would the DBW still be a issue?
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Old 11-03-2011, 05:08 PM   #11
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Quote:
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But if your using the Whole STI harness and ecu would the DBW still be a issue?
No just more complicated
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Old 11-03-2011, 05:19 PM   #12
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Gottcha! This is going to make my V5 STI Swap so much easyer with more tuning options
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Old 11-04-2011, 03:27 PM   #13
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There was a long thread about this on RS25, basically the way to go with a v5/6 engine, if you DON'T want to just use the v5/6 intake/wiring/ecu, and if you need emissions/OBD compatibility, is to use a usdm WRX intake, harness, and ecu, and just use the jdm longblock. That way you have all the mechanical performance benefits of the jdm engine (forged pistons, good valvetrain, etc) and the tuning options of a usdm WRX
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Old 11-04-2011, 04:27 PM   #14
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any chance you can LINK me?
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Old 11-04-2011, 06:08 PM   #15
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well theres no point in reading the thread, i summarized it all just there. also i believe you have to switch your cam gears (at least the one on the left intake) to WRX style so the cam sensors work. but literally for all reference purposes you'd be doing a USDM WRX swap, except the longblock is JDM. youd have to get the wiring from a WRX and merge it with your chassis/dash harness.
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Old 11-04-2011, 06:27 PM   #16
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I don't think you have to swap the gear. The V5-6 EJ207 is a phase 2 engine.
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Old 11-04-2011, 11:06 PM   #17
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"FOR v5/6 Engines to pass in CA you need to swap over to a WRX ECU (which means wiring it up) and running the WRX intake manifold/cam gears/sensors/etc as talked about before."


So The 207 Will need the 205 cam gears?
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Old 11-05-2011, 12:28 PM   #18
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The more obvious tell would be the crank gear. The older style has only 6 knobs on it for the crank sensor and the newer one has like 36 little ones. If it has the newer crank gear, you are good to go. If it has the older one, then you need a new crank gear and cam gears.

You can see the difference HERE.
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Old 11-08-2011, 12:32 PM   #19
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you SHOULD swap over all 4 cam gears for consistency but you only NEED to swap the left intake cam gear (and the crank gear, as discussed) because those are the only 2 that have a sensor with them
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