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Old 02-24-2004, 05:08 PM   #76
Subahaulic
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I wonder why crazyhorse got 600cc from the .5mm drill mod, while you got 720cc. The "circumcision mod" has resulted in several sets flowing 740cc vs. five sets @ 850cc. I am begining to think we are seeing a variance in machining or fuel pressure during testing; although, RG Eng. was the tester in most cases.

Anyone with ideas?
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Last edited by Subahaulic; 02-24-2004 at 05:16 PM.
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Old 02-24-2004, 05:35 PM   #77
crazyhorse
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I'm going to triple check the size of that bit first....
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Old 02-24-2004, 07:23 PM   #78
Aaron'sWRX
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Quote:
Originally posted by Subahaulic
I wonder why crazyhorse got 600cc from the .5mm drill mod, while you got 720cc. The "circumcision mod" has resulted in several sets flowing 740cc vs. five sets @ 850cc. I am begining to think we are seeing a variance in machining or fuel pressure during testing; although, RG Eng. was the tester in most cases.

Anyone with ideas?
The 740cc was the injector under 30psi, not the standard 43 psi for flow testing the injectors. So they are really 850cc injectors. It was just a difference in how much psi was ran doing the flow test..
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Old 03-10-2004, 10:52 AM   #79
geronimo66
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Does anyone have access to a machien shop that could make a simple jig and a repeatable result. That would be worth some $$ to people I think. Send you stockers in for a verified 600cc inj.
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Old 03-12-2004, 10:13 AM   #80
Subahaulic
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Just to update this discussion--I now have both WRX blue injectors and STi piink injectors that have been precisely examined microscopically, with the following results/ observations--and the news is not good.

The spray hole sizes are as follows: WRX=0.25mm
STi = 0.3mm
The bad news is that, aside from the very small aperature sizes, the Subaru/Denso engineers have designed these at severe angles to create a difficult to replicate fan-like dispersal spray. The STi pinks also have much steeper angles (=wider spray capability) than the WRX blues.

My conclusion is that realistically increasing the small aperature sizes by drilling the blues, combined with the requirement to slant them for dispersion, is not likely to be achieved by those of us that need between 440 to 700cc's/min of flow.

This in no way reflects on the efficacy of the "decapitation/circumcision mod" to get ~850cc's/min, which has now proven to be readily tunable by those requiring that much flow.
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Old 03-12-2004, 02:16 PM   #81
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nice info subahaulic, but if we drill the wrx inj. then we would get a different spray pattern, and if we switch to sti pinks we get a different spray pattern, so in both cases we get different spray patterns. Also does anyone know if they sell .3mm bits out there?
since .5mm seems to leave very little room for error.
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Old 03-13-2004, 02:35 AM   #82
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is there anyway we can buy STi caps to put on our blues?
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Old 03-26-2004, 05:33 PM   #83
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any updates crazyhorse?
I wonder to what extend does RC checks for the proper pattern.
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Old 03-26-2004, 05:56 PM   #84
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Quote:
Originally posted by blaznasn
nice info subahaulic, but if we drill the wrx inj. then we would get a different spray pattern, and if we switch to sti pinks we get a different spray pattern, so in both cases we get different spray patterns. Also does anyone know if they sell .3mm bits out there?
since .5mm seems to leave very little room for error.
That small is getting real tough to use for anyone who isn't trained, or has learned to deal with bits that small.

.3429mm .0135" #80
.3683mm .0145" #79
.3969mm .015625" 1/64"
.4064mm .016" #78
.4572mm .018" #77
.5mm .0197"
.508mm .02" #76
.5334mm .021" #75
.5715mm .0225" #74
.6096mm .024" #73
.635mm .025" #72
.6604mm .026" #71
.7112mm .028" #70

See: http://www.ehobbytools.com/index.htm...tml&lang=en-us
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Old 09-16-2005, 09:55 AM   #85
vtt
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so
how this story finished?
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Old 09-16-2005, 10:16 AM   #86
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I never did flow test the injectors I had drilled.... Ended up buying an STi...
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Old 09-19-2005, 10:52 AM   #87
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I was looking forward to seeing if all 4 ended up spraying 600cc's
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Old 09-19-2005, 11:22 AM   #88
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Ok, noob here with a question on this mod.
From what I'm gathering after reading this, are you guys drilling out your stock injectors to increase the bore size? It sounds like it should work in theory, but it also sounds kinda sketch. Let me know if thats what you're doing or if I just have my head up my ass.
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Old 09-19-2005, 09:21 PM   #89
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Quote:
Originally Posted by Crashman287
Ok, noob here with a question on this mod.
From what I'm gathering after reading this, are you guys drilling out your stock injectors to increase the bore size? It sounds like it should work in theory, but it also sounds kinda sketch. Let me know if thats what you're doing or if I just have my head up my ass.
its more a matter of taking off a restricting endcap more than it is "boring" it out. The end cap is cut off ever so slightly at the weld.
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Old 10-18-2005, 03:47 PM   #90
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any update?
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Old 10-18-2005, 07:25 PM   #91
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I read 4 pages of posts, hoping to add another page to my book of tricks, only to learn he bought an STi. Where was the commitment at at bettering the community?!
Well, congrats on the STi and I hope your finger gets slammed in a door for not following through.
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Old 10-18-2005, 07:27 PM   #92
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It's an evil plot for me to sell more cars actually And now I'm thinking about ditching the 04 for an 06 STi!
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Old 10-19-2005, 04:28 AM   #93
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One question I have is if enlarging the holes will have any affect on the ionization of the gas. I know that removing the cap gives you more cc's but another issue with that is that the gas doesn't ionize properly reducing gas efficiency. Will enlarging the holes have the same effect and reduce efficiency?
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Old 10-19-2005, 09:57 AM   #94
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I think I would much prefer to cut off the end caps, if sticking with the stock ECU.

The stock ECU has a value in the programming that specifies injector size. You just change this as appropriate and you're good to go - no crazy timing due to lying about the air flow.

I guess if you are using piggybacks then that is a drawback in this case.

-Adrian
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Old 10-19-2005, 10:48 AM   #95
quadturbowrxgtr-s
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it is a problem with Ecutek as well.
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Old 10-19-2005, 01:37 PM   #96
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Quote:
Originally Posted by quadturbowrxgtr-s
it is a problem with Ecutek as well.
Why would it be a problem for Ecutek? Can't they just adjust the injector scaling values as well?

Thanks!
Adrian
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Old 10-21-2005, 11:42 PM   #97
quadturbowrxgtr-s
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IDK but when I spoke with my "tuner" and mentioned doing the "cap cut" he said they have had problems with a few they have done as far as idle goes.
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Old 10-28-2005, 08:26 PM   #98
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Update?
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Old 10-28-2005, 08:33 PM   #99
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Update is I bought an 06 WRX Wagon.... No idea where those injectors ran off to
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Old 10-29-2005, 10:45 AM   #100
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oooh '06 wagon with the corazon kit would be sex on wheels!

or the dolphin kit that's nice too!
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