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Old 06-21-2009, 11:27 PM   #1
midnight2.5rs-t
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Default some questions and help requested

alright i am trying to get my car boosted asap and i have a couple of questions. first off i wanna mod my stock injectors but i dont know what cc's they will be or how to do it propperly. so if someone can enlighten me that would be great. also is there any one here that can help learn to tune or get me a base map. i ask here cause i know you guys will help. i will give you more details on the setup if anyone can help me.
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Old 06-22-2009, 12:19 AM   #2
IllNastyImpreza
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you'll get more help if you include more info. What are you going to tune with ? a reflash, standalone ?piggyback?

If you are running the same rails as the WRX then you could just grab a set of wrx injectors. AFAIK the only Injectors easy enough to modify yourself ARE the wrx injectors. People have modified other ones but are a little more tricky to do so. IE the yellow sti injectors are harder and most people send off to PE to have modified and flow tested.
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Old 06-22-2009, 12:54 AM   #3
midnight2.5rs-t
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Originally Posted by IllNastyImpreza View Post
you'll get more help if you include more info. What are you going to tune with ? a reflash, standalone ?piggyback?

If you are running the same rails as the WRX then you could just grab a set of wrx injectors. AFAIK the only Injectors easy enough to modify yourself ARE the wrx injectors. People have modified other ones but are a little more tricky to do so. IE the yellow sti injectors are harder and most people send off to PE to have modified and flow tested.

gonna run a greddy emu for engine managment. they are the top feed rails but i have also heard that with running the wrx injectors on the rs you have to delete the air assist and buy special o-rings to make them fit. i am gonna a 16g turbo from an sti ra with a top mount then basic bolt ons and ewg, and i have changed the boost i wanna run like 10 different times. the only reason why i wanna try and mod em is to try and save some dough for a wide band.
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Old 06-22-2009, 12:59 AM   #4
IllNastyImpreza
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There are tons of threads about the injector options. you should check them out. I'm not as familiar with the 02+

you say you are saving for a wideband, so you are going to try to tune it yourself? props for the DIY ingenuity. I'm in the same boat myself. I'm gonna be running an EMU and trying to establish a base map myself. The price of a tune is rediculous these days. For the 500 bucks it costs to get your car tunes, you can buy the wideband and guages and everything and street tune it yourself....it just takes alot longer
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Old 06-22-2009, 11:10 PM   #5
midnight2.5rs-t
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Originally Posted by IllNastyImpreza View Post
There are tons of threads about the injector options. you should check them out. I'm not as familiar with the 02+

you say you are saving for a wideband, so you are going to try to tune it yourself? props for the DIY ingenuity. I'm in the same boat myself. I'm gonna be running an EMU and trying to establish a base map myself. The price of a tune is rediculous these days. For the 500 bucks it costs to get your car tunes, you can buy the wideband and guages and everything and street tune it yourself....it just takes alot longer

i hear that, and the 00-04rs are the same. i am gonna look around for answers on the injectors.
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Old 06-23-2009, 10:19 AM   #6
master c
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okay - i have a custom fuel system on my 00 RS. bought SARD fuel rails for a WRX and built custom brackets to mount them. the spacing between the injectors is the same, but the way they mount is different cuz wrx and sti have TGV's. You could essentially buy any fuel rail setup designed for a wrx or sti as long as you have the skills to build new brackets to make em mount up - this way you can use stock o ring kits for wrx or sti topfeed injectors and have them work flawlessly with the rails without having to buy custom o rings. the next thing you will want to do is have the intake manifold modifed for the new injectors. the stock injectors have air assist BS on em...so the stock injectors have caps that go on the ends and allow the injector to sit flush with the runner. any wrx or sti injectors will not have these caps so when you install wrx or sti topfeeds in the manifold they will be too far up inside the runner for an effective spray pattern. what you do to correct this is take the injector donut gasket/o ring from the tip of the injector on the WRX and drill the hole in the intake manifold where the injector goes. the goal is to drill/machine the hole out slightly larger in diameter so the donut gasket fits nicely - then you will need to drill/machine the top part of the hole so the injector body will sit farther down in the intake manifold. you want the tip of the injector to sit flush with the runner just like stock. you can then weld or cap off the air assist system and just leave the solenoid plugged in to keep CEL's from popping up for the air assist system. if you do this method of work you can use any topfeed injector designed for the WRX or STI and have it be a bolt in affair. (very easy by the way, only took me an hour to do this and some creativity for the fuel rail mounting brackets)
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Old 06-23-2009, 10:20 PM   #7
midnight2.5rs-t
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thanks that helps alot, i knew there was some crap there about the air assist.
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