Basically for anyone who can't be bothered reading all of it, it appears that underneath the cap with the holes in it most of the turbo subaru injectors flow the same. (740cc) The only difference between the flow put out by the pink top STI injectors and the normal blue/greyish top ones is the size/pattern of the holes in this cap.
The initial mod to attain 740cc flow was to simply cut this cap right off allowing total flow and a conical shaped spray pattern. However, putting out 740cc is alot for most of us not needing anywhere near this to adjust with tuning.
Soooo the guys looked into drilling out the standard WRX injectors to put out higher ratings... They found on the stock WRX injectors that using a 0.5mm bit they were able to achieve 600cc and a spray pattern desribed by RE (injector specialists/testers) as excellent!!!
Sooooo this has got me thinking... i'm going to order some .5mm drill bits and test this with the RS injectors. If anyone has a set i can get my hands on at a reasonable price i'll investigate! Might try some EJ22 ones too if they'll fit... Al can you shed any light on this?
And just so you all know to run the larger injectors you will need some form of tunable ECU/piggyback. I'm considering an SAFC II
if this is true then who needs to blow 500 bucks on sti injectors when we can mod them ourselves, along with a fuel management system (SAFC) as stated. Make massive cheap power.
Mark,
1991 Turbo Sedan, Aspen White 5MT, Sold RIP
1994 Turbo Sedan, Crimson Pearl 5MT, from British Columbia-no rust!
Vrg3 has experimenting with cutting the caps off of the 92-94 N/A injectors too. IIRC he's going to try and get them flow tested as some point. Us turbo guys would have to swap in the N/A fuel rails to use them but they bolt right up and it shouldn't be expensive or difficult.
-Matt
'92 SS 5mt. All go and no show. Sold :(
'94 Audi UrS4 Modded (new project)
'96 Outback 5mt.
'07 Legacy 2.5i SE
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Oh... and I hope the fucker get bunked with Gunter, arrested for raping Gorillas.[/quote]
hold on hold on, if i take the caps of my injectors the little hat that sits over my pink injectors with to bolts holding it down, this will make them run at 720cc. come on is this true or am i dreamming????
no, hehe, They're talking about the bottom side of the injectors the part where the fuel exits, apparently the new injectors are all the same on the inside, just the cap they have on the bottom is what keeps them from producing the same amount of cc/min. I think it was found out that our injectors wouldn't work for this or something, I can't really remember cause I wasn't paying much attention but there's a thread about it.
total lost on all this. ok my intake maifold is off right now, what i see is a silver steal cap in the inside of manifold where the injectors go and there is one hole in that cap. if i drill to small pin holes in it i will get more gas flow ---> :. thats my pattern what you think.
I think I have no idea, According to that thread we don't have the same injectors as the ones they're doing this to on nabisco. If you've got later style injectors then it could work, but don't hold me to that.
Rio Red 90 Legacy LS AWD 174k
Liquid Silver 92 SVX LS-L 88k
[url=http://folding.amdmbpond.com/FoldingForOurFuture.html]Do you fold?[/url]
I'm on First and First. How can the same street intersect with itself? I must be at the nexus of the universe.
Don't drill holes in the tips of your injectors, Nico! You're not looking at a cap; you're looking at the outlet of the ball valve in the injector.
92-94 non-turbo injectors do have the same kind of cap as the WRX injectors, and those could in theory be drilled. Like legacy92ej22t said, I have a set of four that I cut the caps off of but I haven't had time to flow-test them yet.
A concern I have about enlarging the holes by hand is that it could be hard to get them all precisely the same. The guy who started the post (Crazyhorse) only ever got one injector flow-tested and nobody seemed to think that was an issue. I posted that concern up in that NASIOC thread, but in true NASIOC style they just ignored the technical fact that you can make different-sized holes with a single drill bit :roll:.
Anyway, yeah, another guy (Aaron'sWRX) drilled four injectors and found two to flow the same and two to leak. That's not enough to convince me that drilling by hand is a workable idea... yet.
"Just reading vrg3's convoluted, information-packed posts made me feel better all over again." -- subyluvr2212
ok ok i thawt it was goign to be eazy thanks for the clearing up the matter for me, i read all those posts and they lost me so dont even think about doing that then i wont
The thing i would be worried about with doing this would be decreasing the fuel velocity out of the injector too much, and the spray pattern. These can have a negative effect on the way the car runs that would make me rather spend some money on some upgraded injectors rather than modify mine. Now if someone does this and it seems to work ok, i might reconsider it, but we'll see.
Ben
91 Celica All-Trac @ 0 psi (turbo being installed)
92 Celica Turbo FWD (swap) @ 12 psi HOLY CRAP!!! I miss AWD
He has run the modded (new CNC machined end caps) with the Perring BIG MAF intake and his car runs like stock. The advantage he gained was mainly seen in his data logs.
At WOT and around 6300 RPM his STi was reading 93% duty cycle on the stock injectors. He's now reading 65% and the ECU has had no problems handling the addtional fuel/flow.
Jim a local modded EJ22T equipped Impreza owner is planning to have this modification done to his stock Legacy Turbo injectors and see if this does the same for him and will allow him to run more boost with more fuel without any changes in engine management.
