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Old 03-01-2006, 08:58 AM   #1
Zackbo
Scooby Specialist
 
Member#: 43151
Join Date: Sep 2003
Chapter/Region: South East
Location: Charlotte, NC
Vehicle:
04 STI
Kinda Silver-ish

Default Squeezing it all out of 440cc's

I've been having some fun lately seeing just how much power I can get out of the stock 440cc injectors. And I'm a little suprised

As long as I start fading boost by 5.5k rpm's, I never see the 90's, and my car pulls as good as it did with tuned modded stockers. So, I'm cheating a little; I've did the FPR mod, and I'm running a mix of 98 octane for safety.
Details: Deadbolt Kong turbo, full exhaust, stock TMIC.

I've got a set of pinks ready to go in, and I'll probably put them in just as a safety factor, but I wanted to inform the community on what could be accomplised with the stock 02-05 injectors and good gas


3809 +8.4 3.8 100 40 00 rich +16.3 49.4 +19.0 -1.6 450.00 3.6 rich0
3866 +9.4 3.6 100 50 00 rich +14.2 56.1 +19.3 -1.7 450.00 3.5 rich0
3992 +9.4 3.6 100 50 00 rich +14.5 56.0 +19.3 -1.7 450.00 3.6 rich0
3949 +12.2 3.8 100 60 00 rich +13.3 63.8 +18.8 -1.3 450.00 3.6 rich0
4030 +12.2 3.8 100 60 00 rich +13.1 64.7 +18.9 -1.3 450.00 3.6 rich0
4110 +14.6 4.0 100 80 00 rich +12.8 68.2 +17.8 -1.2 450.00 3.7 rich0
4074 +14.6 4.0 100 80 00 rich +12.6 69.9 +18.2 -1.3 450.00 3.7 rich0
4166 +15.8 3.9 100 80 00 rich +12.0 68.7 +17.3 -1.6 450.00 3.8 rich0
4177 +16.4 4.1 100 80 00 rich +11.8 67.9 +17.6 -1.6 450.00 3.7 rich0
4290 +17.4 4.1 100 80 00 rich +12.9 72.1 +17.8 -1.8 450.00 3.9 rich0
4301 +18.2 4.1 100 80 00 rich +13.2 72.4 +17.4 -1.8 450.00 3.9 rich0
4357 +18.6 4.0 100 90 00 rich +12.9 74.5 +17.5 -1.7 450.00 3.9 rich0
4468 +18.8 4.1 100 80 00 rich +12.6 74.8 +18.1 -1.8 450.00 4.0 rich0
4468 +19.2 4.1 100 80 00 rich +13.0 74.3 +17.9 -1.7 450.00 3.9 rich0
4610 +19.4 4.1 100 90 00 rich +13.2 77.3 +18.9 -1.7 450.00 4.0 rich0
4597 +19.4 4.1 100 90 00 rich +13.5 79.8 +19.3 -1.7 450.00 4.0 rich0
4728 +19.6 4.2 100 90 00 rich +14.9 84.5 +21.2 -3.3 450.00 3.9 rich0
4681 +19.6 4.2 100 90 00 rich +15.5 83.8 +21.0 -3.3 450.00 3.9 rich0
4866 +20.0 4.2 100 90 00 rich +15.5 83.5 +21.8 -2.0 450.00 3.9 rich0
4859 +20.0 4.2 100 90 00 rich +15.6 88.3 +23.5 -2.0 450.00 3.9 rich0
4852 +20.2 4.2 100 90 00 rich +17.4 82.0 +22.2 -3.5 450.00 3.9 rich0
4997 +20.0 4.2 100 90 00 rich +17.3 81.2 +23.1 -3.7 450.00 3.9 rich0
5081 +19.8 4.2 100 90 00 rich +19.1 83.7 +23.6 -3.5 450.00 3.9 rich0
5027 +20.4 4.2 100 90 00 rich +19.6 85.6 +23.2 -3.6 450.00 3.9 rich0
5065 +19.8 4.3 100 80 00 rich +19.8 87.4 +24.8 -3.7 450.00 4.0 rich0
5184 +19.2 4.2 100 80 00 rich +20.5 85.6 +24.9 -3.9 450.00 4.0 rich0
5128 +19.2 4.3 100 80 00 rich +21.0 85.4 +25.1 -4.2 425.00 4.0 rich0
5167 +18.8 4.3 100 80 00 rich +21.6 87.2 +26.0 -3.9 425.00 4.0 rich0
5385 +18.8 4.3 100 80 00 rich +21.9 88.9 +26.0 -4.2 400.00 4.0 rich0
5359 +18.0 4.3 100 80 00 rich +22.4 88.8 +25.8 -4.1 425.00 4.0 rich0
5393 +18.0 4.3 100 80 00 rich +22.5 89.2 +25.8 -4.2 425.00 4.0 rich0
5564 +16.6 4.3 53 70 00 rich +23.6 86.8 +26.0 -4.2 ECU. 3.9 rich0
5446 +16.6 4.3 53 70 00 rich +24.5 81.0 +26.0 -4.4 ECU. 3.5 rich0
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Old 03-01-2006, 11:57 AM   #2
scooby24
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Member#: 56414
Join Date: Mar 2004
Chapter/Region: MWSOC
Location: Olathe, KS
Vehicle:
2004 Forester XT 5MT
PSM

Default

What are your AFR's by redline?

My STi's was only pushing about 13 lbs by redline and at 12:1 AFR (had water injection) my IDC's were around 85.

More boost...smaller injectors...near same IDC...? I'd think your AFR would have to be really lean.
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Old 03-01-2006, 12:12 PM   #3
Zackbo
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Join Date: Sep 2003
Chapter/Region: South East
Location: Charlotte, NC
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04 STI
Kinda Silver-ish

Default

I'm sure I would be running static on the injectors if I didn't taper the boost off significantly at 6k rpm's. I'm talkin' going from 400 to 100 for my CLB #'s. With my driving style, I almost always shift before 6k anyway, so it doesn't really matter. Mid-range torque is my 'cup of tea'
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Old 03-01-2006, 12:32 PM   #4
Kha0S
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Chapter/Region: NESIC
Location: Grantham, NH
Vehicle:
2011 WRX (DGM 5D)
2002 WRX/2003 SVTF

Default

You're also in a geographical region where you don't get as much severe cold. On an average winter morning here, about 15-20F ambient, seeing 25-35F IAT, 13.5 psi or so is enough to see up to 95% IDC at stock fuel pressure and moderate (11.7:1) AFR.

Now, an additional 10psi in the FPR would net me a 10% drop in IDC, and water/methanol injection would yield about another 10% (because I could lean out another point or so in AFR)... I'd need to do both before I'd feel confident in running anything more aggressive than the stock turbo.
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Old 03-01-2006, 01:01 PM   #5
Zackbo
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Join Date: Sep 2003
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Location: Charlotte, NC
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04 STI
Kinda Silver-ish

Default

Yeah, I've considered that. The air is just not as dense around here because of the temps. I did the above pull this morning, and it was about 50F out.

Can anyone recommend what I could do with my timing to inrease torque in mid-range?
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Old 03-01-2006, 01:28 PM   #6
scooby24
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Location: Olathe, KS
Vehicle:
2004 Forester XT 5MT
PSM

Default

your timing looks pretty good...but without seeing your EGT's AFR...and the fact that you're running 98, it's hard to say how much you can move.
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