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Old 11-14-2014, 12:04 PM   #1
BeastianSTI
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Default CL Maf Scaling

Hey guys,

I've been scaling my maf with my new injectors, and I feel like I may have a vac leak. Everything has smoothed out, and i've learned how important it is to maintain constant throttle. Anywho, as i'm lightly accelerating, the car is kind of stumbling/shuttering. If I give it more throttle, it'll shutter for a second and go.




It seems like no matter what I do for 1.2-1.4v, it wont improve. Any ideas guys? Could that be indicative of my injector scaler being off or something? While the shuttering is occurring, the afr bounces between 13.9 and 14.9.

Thank you all!
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Old 11-14-2014, 12:49 PM   #2
fenix-silver
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Was your MAF scaled well prior to the new injectors? My understanding, and what I did, is to ONLY adjust the injector scaling and latency after upgrading injectors with a MAF that was scaled previously.

Oh, did you upgrade your injectors to a different size, or are you just replacing them?
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Old 11-14-2014, 01:10 PM   #3
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I had a tune that was previously working. Installed DW850 injectors due to faulty old injectors. Another member sold me "stock" 05 Sti injectors, but he lied... So I was stuck figuring out how to tune for the injectors. I adjusted scalar and latencies, and then dialed things in with MAF scaling adjustments.
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Old 11-14-2014, 08:51 PM   #4
mr.nicknasty8
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That's like right where you are coming off idle. That area is kind of hard to scale. Try adjusting your tip-in settings
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Old 11-15-2014, 12:33 AM   #5
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Sounds like a tip in enrichment issue.
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Old 11-15-2014, 09:39 AM   #6
BeastianSTI
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maybe I dont understand tip in fully yet. My understanding is that it tip in only goes into effect when you have an increase in throttle angle, right ? Can tip in bare an effect while at a constant throttle position?

Thanks again

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Old 11-16-2014, 03:41 PM   #7
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Bumpday

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Old 11-16-2014, 08:50 PM   #8
mr.nicknasty8
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Tip in takes effect when there is a change in like 4% throttle if I remember correctly... so going from idle to taking off in first, your log indicates you are rich. Try adjusting the tip in


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Old 11-16-2014, 10:48 PM   #9
BeastianSTI
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Ohhh gotcha. Thanks - ill try adjusting it now

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Old 11-17-2014, 01:17 PM   #10
fenix-silver
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Something to keep in mind that I found helpful when dialing in my injector latency/scaling was to only log the fueling corrections when not making throttle changes, or when you're pretty certain the change is less than your minimum tip-in. So when I was driving around, any time I had to come to a stop or had to accelerate briskly, I disabled logging until I was at a more constant throttle position.
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Old 11-18-2014, 11:49 PM   #11
BeastianSTI
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Yeah I made sure to do that whilst doing my logging =]

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Old 11-19-2014, 12:38 AM   #12
ride5000
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How modified is the maf setup?
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Old 11-21-2014, 08:58 AM   #13
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Its just an aps 65 with a green filter on it

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