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Old 03-16-2007, 11:17 AM   #1
WRXINTX
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Default how-to mod STI side feed injectors for Higher flow??

I searched for this and I found nothing on modding the side feeders...

I have an '04 Forester XT automatic and it uses the Yellow top 565cc STI injectors and I am doing a TD06-20G 8cm turbo....

I want to start around 270-300whp and work up to 350-380whp after that...

but, I will probably wait to go above 300whp until I have a built tranny with converter and IPT valvebody....

I have seen pics of these injectors that were modded after removing the screens on the bottom, but, does this require complete disassembly of the injector or can it be modded while still in one piece...???

Thanks for the help

RYNO
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Old 03-16-2007, 12:01 PM   #2
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Do you have a milling machine?
If not then send them out to be modded. The side feeds are not like th etop feed that can be modded with a razor.

TMS
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Old 03-16-2007, 12:45 PM   #3
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Yes, I have access to a bridgeport mill, a lathe, and a great old friend who is a retired master machinist from the Navy...

He is an awesome guy!!!!

Do you have any pics or directions as to how deep to mill them off and do they have to be dissasembled???

Thanks!
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Old 03-16-2007, 01:39 PM   #4
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From looking at them all they do is macnine out the screen in the tip. Make sure to have them flowed and cleaned after/if yu do it.
I have never done it. I have never seen them done. I have never seen a write up to do it.
I do know that on the top feeds that screen is REALY thin. I have done 12 sets of top feeds or so.

TMS
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Old 03-31-2007, 01:19 AM   #5
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I modded the yellow 550 sti side feeds on my setup. I used a mini disc cutter (harbour freight) and first cut off the aluminum diffuser on the end. then I slowly ground the end down until the screen was cut out. I didnt flow test them, but damn they flowed ALOT more!
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Old 03-31-2007, 09:12 AM   #6
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Old 03-31-2007, 09:23 AM   #7
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I think you could do it with a dremel with some of the smaller metal cutting bits. Need to be very careful though.
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Old 03-31-2007, 10:00 AM   #8
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I tried with a dremel and failed miserably. I destroyed 3 injectors. w00t!
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Old 03-31-2007, 03:19 PM   #9
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yeah it seems like it would be hard to do with a dremel.
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Old 03-31-2007, 03:45 PM   #10
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Quote:
Originally Posted by reddevil View Post
I modded the yellow 550 sti side feeds on my setup. I used a mini disc cutter (harbour freight) and first cut off the aluminum diffuser on the end. then I slowly ground the end down until the screen was cut out. I didnt flow test them, but damn they flowed ALOT more!
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Old 03-31-2007, 09:59 PM   #11
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Hey...

1 - they work great.

2- I am not tuning for milage, simply balls out fuel.
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Old 04-01-2007, 01:07 PM   #12
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Quote:
Originally Posted by reddevil View Post
Hey...

1 - they work great.

2- I am not tuning for milage, simply balls out fuel.
i guess you know that your duty cycle went down, but how do you know if they are flowing evenly.
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Old 04-01-2007, 01:11 PM   #13
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Quote:
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i guess you know that your duty cycle went down, but how do you know if they are flowing evenly.
he doesn't, and they're not.
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Old 04-02-2007, 12:26 AM   #14
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But I did a 12.9 at 109.56 spinning 1st and 2nd!

If you aren't tuning for milage, whats a few cc's between injectors if you are tuning for a "rich" tune?
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Old 04-02-2007, 01:45 AM   #15
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Deatschwerks is in my home town, and I got to see the results of their professionally "hacked" side feeds... they didn't flow anywhere close to equal.

Have them professionally modded so they flow well, as well as retaining a good atomization pattern.
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Old 04-02-2007, 05:18 AM   #16
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I have been running the "hacked" side feeds for ~1 week now.
They were sent out for cleaning and flow testing. They came back with 804, 804, 800, 800, with a "good" spray pattern.
My milage might have come down ~1 maybe 2 MPG. The ECU still targets 14:1 durring cruise, if the AFR dosen't change the MPG is not going to change much if at all. All at cruise, once on boost well that whole MPG thing doesn't matter any way.

TMS
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Old 04-02-2007, 11:57 AM   #17
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to everyone: cleaning and flow testing does not make injectors flow similarly! I have seen the bench results of hacked injectors and it's scary how bad they are. Real easy to burn a hole in a piston when your differences are 10% or more across the board.
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Old 04-02-2007, 02:17 PM   #18
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If anyone needs injectors flowtested/cleaned, send me a PM. I have access to a flowtester, and the prices are probably better then anyone else can do. Its a fun toy to play with too

--mark
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Old 04-03-2007, 03:12 AM   #19
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"flow testing" doesn't account for voltage changes as well as the various operating conditions of an injector. I have personally seen differences of over 10% from injector to injector. On an aggressively tuned car this can mean a blown engine.

That said, if you must run a stock modified injector, always remember to place the highest flowing ones in #3 and #4 - these are the leanest / hottest cylinders.

Gary
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Last edited by Gruppe-S; 04-03-2007 at 08:50 PM.
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Old 04-03-2007, 08:49 PM   #20
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playing editor for the good of all cylinders......

Last edited by reddevil; 04-03-2007 at 08:56 PM.
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Old 04-03-2007, 08:50 PM   #21
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Quote:
Originally Posted by reddevil View Post
Wouldn't you mean HIGHEST flowing?
Ooops yeah highest flowing, thansk for noticing that. Fixed!

Gary
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Old 04-06-2007, 11:00 PM   #22
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Used my modded injectors today to do 311 hp and 354 torque at 22 psi with a 7-1 compression motor. Had 11-1 afrs on average.
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Old 04-06-2007, 11:31 PM   #23
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Quote:
Originally Posted by benw View Post
to everyone: cleaning and flow testing does not make injectors flow similarly! I have seen the bench results of hacked injectors and it's scary how bad they are. Real easy to burn a hole in a piston when your differences are 10% or more across the board.
Thats not the point of cleaning and flow testing now is it? Cleaning allows it to flow as much as possible, and flow tests to see how much they flow. I dont see flow matching anywhere in there
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Old 04-07-2007, 06:00 PM   #24
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Quote:
Originally Posted by reddevil View Post
Used my modded injectors today to do 311 hp and 354 torque at 22 psi with a 7-1 compression motor. Had 11-1 afrs on average.
The AFRs, unless measured at each individual cylinder will not indicate a problem if some are running a bit richer on some a bit leaner on others. If you are measuring at the header collector and you have a sensitive WB02 (I am using the PLX one) you might detect a broader deviation in AFR which could be an indication of a problem as I have done in the past, but it is still difficult to detect.

No doubt modded injectors work, my recommendation to everyone going modded is to just make sure you get individual flow numbers, avoid installing injectors with high deviations in flow, and put the highest flowing ones on cyl 3/4.

Oh BTW if you need OEM cores, we have tons in stock right now.

Gary
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