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2004 USDM STI, which Link EM will work with my DBW system?


Anthony Cedio III
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I am doing a rather large build on my 2004 STI. I am installing a 2.8L engine and 70 pound a minute turbo. I am currently using Cobb AP for my engine management system, the problem is the tip in scale for the AP is only calibrated to 860cc injectors. I was looking at your WRXlink G3 and like a lot of the features. I will mostly be dragracing this STI so the launch control, flat-foot shifting and anti-lag should all be an added bonus. I have read everything I can find about the WRXlink G3 and can't find out weather it will work with the STI's drive-by-wire throttle system. I was also wondering what size injectors the WRXlink can handle, I may need 1600cc injectors. With the new STI are there any other factory installed systems that will not allow me to use the WRXlink G3? The manual for the WRXlink G3 says that you replace the entire factory ECU with the link ECU, is the Link ECU programed to handle all of the options on the STI? Will I loose control of the Driver Controlled Center Diff? Will I loose cruise control? Will the super sport ABS still work? Basically the car will still be driven on the street, just not everyday, so I need an EM that will still allow me to use most of the factory systems so the car remains reliable and still has use of all of it's features. Thank you for your time, Tony Cedio

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Unfortuneately your STI is what we call a version 10.  The WRXLink is designed only for versions 7-9 so does not have DBW controll.  As far as our research indicates, the factory ECU does not control ABS and Centre Diff, these are run by independent controllers.  The ECU may take input from these controllers however.  As far as injector sizing goes, there is no upper limit on injector size.  The WRXLink can do staged injection which would allow you to  run two sets of smaller injectors and get some of your driveability back.  The only things it cant control  will be the cruise control as that is part of the DBW system.  But all this is irrelevant as it will not plug in to your car (V10 has a four row header, WRXLink has 3 row)!  Our best solution would be the LinkPlus G3 (to be released in approximately 6 weeks).  It has all the tuning features of the WRXLink G3, has a DBW controller.  note that this will be a wire  in ECU...

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