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Old 01-25-2006, 04:57 PM   #1
overdose
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Default STG2 STI's, what IDC are you seeing 5500+ w/ ~16 tapering to ~15psi by redline?

I installed a typhoon and it seems to read ~+.05v above 5500 bringing my past idc's of 95-97% to 104-106%, car has just tyhoon short ram, catless tbe and accessport... with my boost curve up there what idc's are you seeing at what afr?
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Old 01-25-2006, 07:00 PM   #2
entropy138
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Back when i had just the tXs short ram and invidia dp (stock catback) on the stage 0 and stage 1 utec maps I was seeing over 100% idcs... AFR's were originally in hte 10.3-10.4:1 range and after leaning out to 10.9-11.0:1 I was still hovering right on the 99-100%++ idcs.... There just isn't much room on the stock injectors unfortunately...
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Old 01-26-2006, 12:33 AM   #3
bboy
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There's an old thread somewhere in the 2.5 forum with a log of a stock STI tune with 99% IDCs. That's all you get out of those injectors.
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Old 01-26-2006, 12:47 AM   #4
SloRice
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I was maxxing out my injectors above 6000RPM's at 15psi and 11.2:1AFR. I recently installed a walbro fuel pump and my IDC's went down to about 94-95%. For $100 it gives you just enough head room for a Stg2 STI.
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Old 01-26-2006, 12:51 PM   #5
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around 68% or so IIRC. Ill look later. Its no higher than 75% I know that.

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Old 01-26-2006, 12:55 PM   #6
SloRice
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^^Stock injectors? What is your fuel pressure at to make the injectors perform that big??
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Old 01-26-2006, 03:05 PM   #7
bboy
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I can't believe Dave has stock injectors.
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Old 01-26-2006, 04:04 PM   #8
edmundu
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I have a '05 LGT, but it is effectively running a STG2 STI setup(vf39,manifold,TMIC,dp/up,Custom PDX AP). With MAFv=4.68-4.70, I see inj duty cycles of 106-116%! This was logged using EcuExplorer if it matters...
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Old 01-26-2006, 04:11 PM   #9
nhluhr
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Yeah guys, when you are reading 99% on the IDC, it is NOT as much fuel as they can flow. They will keep increasing pulse width until the IDC is in the 115% range.
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Old 01-26-2006, 04:15 PM   #10
WolfPlayer
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I'm running 104% on the stock injectors at 11:1 AFRs. No problems. And YES ... for those reading this ... I DO have Walbro fuel pump installed. The pump makes no difference!

t

Last edited by WolfPlayer; 01-26-2006 at 04:26 PM.
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Old 01-26-2006, 05:27 PM   #11
SloRice
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Old 01-26-2006, 07:45 PM   #12
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Quote:
Originally Posted by SloRice
^^Stock injectors? What is your fuel pressure at to make the injectors perform that big??
Stock injectors
Stock fuel pressure
No RRFPR.

One secret weapon.
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Old 01-26-2006, 08:03 PM   #13
Freon
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Today I read about 90% @ 11:1 @ 5250rpm @ 4.4V MAF @ 16.7psig on a 45F day
... as read by a UTEC. Stock pump and injectors.
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Old 01-27-2006, 12:22 AM   #14
SpaldingSpeed
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Quote:
Originally Posted by Davenow
Stock injectors
Stock fuel pressure
No RRFPR.

One secret weapon.

um....Alky?
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Old 01-27-2006, 12:25 AM   #15
Davenow
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Quote:
Originally Posted by SpaldingSpeed
um....Alky?
And thats at 20PSI btw
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Old 01-27-2006, 11:13 AM   #16
SloRice
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well, that's cheating
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Old 01-27-2006, 01:56 PM   #17
bboy
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I want Dave's secret weapon.
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Old 01-27-2006, 07:51 PM   #18
entropy138
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Quote:
Originally Posted by SloRice

I agree - mine dropped 3-4% idcs with the addition of the walbro. Granted I didn't document all conditions like WolfPlayer but I was seeing over 100% from about 4500 on up and after the pump I could get into the 6500 range without ever seeing over 97-98... about 6500 it lost it tho. Maybe wolfplayer's FPR held up to the added pressure a bit better then usual?

Then again its easily arguable the a 3-4% drop isn't really an improvement - but it does constitute a 'difference'

Last edited by entropy138; 01-27-2006 at 07:57 PM.
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