WHY?? AFR Roller Coaster at steady state driving
Small annoyance but it is driving me crazy.
When:
-Steady state driving
-RPM = 1000 --- 2500
-TP = 10% --- 18%
It feels like a surge when cruising along. The surge feeling mirrors the up and down AFR (see pic below)...
Any ideas or help??? All mods in SIG...
Last edited by SideStep; 11-30-2006 at 05:21 PM.
2007 CTS-V LS2
Look at the Closed Loop Proportial Base vs Airflow Mode table and reduce it 20-40% to start. Then re-log and see if AFR error is as jaggy.
Also look at the Idle proportional. It will probably need a reduction as well.
EC
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Originally Posted by EC_Tune
Good deal... thanks!!!
2007 CTS-V LS2
I had to set mine to 0 at low flow, definately looks like that is what is happening.
Sulski Performance Tuning
2000 WS6 M6 - LS6 (long block, refreshed top end), 10.8:1 CR, 90 mm ported FAST, Exo-Skel, 227/232 cam, QTP HVMC, EWP, GMMG, 9" w/4.11s
2018 Sierra SLT 5.3L A8 - Airaid intake tube, GM Borla catback, L86 Intake/Ported TB
Thanks for the replies.... I will try reducing those values and re-scanning tomorrow AM...
2007 CTS-V LS2
I knew I would the answer here...
The answer was in the Closed-Loop Proportional Base vs. Airflow fueling. I reduced the values and got immediate results. Logged some this AM and will fine tune after lunch...
2007 CTS-V LS2
cool dude
Sulski Performance Tuning
2000 WS6 M6 - LS6 (long block, refreshed top end), 10.8:1 CR, 90 mm ported FAST, Exo-Skel, 227/232 cam, QTP HVMC, EWP, GMMG, 9" w/4.11s
2018 Sierra SLT 5.3L A8 - Airaid intake tube, GM Borla catback, L86 Intake/Ported TB
Mine looks very similar to that, maybe I'll try this too.
'00 Corvette FRC
HPTuners, AEM WB, PP&C Stg 3 Heads, PRC Gold, G5X3 114, LS6 Intake, Trick Flow 7.4 PRs, SVO 30#, LS2 Chain, 160* Stat, BPP Vortex Rammer, Dynatech Supermaxx L/Ts, B&B Bullets, Magnecor, NGK, B&M 45044, R-D Racing Cross Bar, Z06 Clutch Assembly, DRM Brake Ducts, Goodridge SS Lines, Speedbleeders. . . .Black Z06 Motorsports
Exxxcellennnttt... <in my best C. Mongomery Burns accent>
Always Support Our Troops!
Is there a procedure to fine tune these values??? (log this or that and compare to current values, then make change???) OR is it a poke and hope then try again deal???
Thanks All
:lurk:
2007 CTS-V LS2
keep logging, make adjustments accordingly
Sulski Performance Tuning
2000 WS6 M6 - LS6 (long block, refreshed top end), 10.8:1 CR, 90 mm ported FAST, Exo-Skel, 227/232 cam, QTP HVMC, EWP, GMMG, 9" w/4.11s
2018 Sierra SLT 5.3L A8 - Airaid intake tube, GM Borla catback, L86 Intake/Ported TB
well.... I knew that would be part of it... anyone care to recommend certain PIDs (or whatever) to monitor???
2007 CTS-V LS2
You've got them logged now. What you want to happen is the STFT dithering back and forth about 3-6% if it's less than that you need to increase the value. If it's more, decrease. Can't give you exact values as there aren't any pids that deal directly with mode number. You will have to interpolate from the General Mode vs Airflow table to see where you are.
HTH
EC
Always Support Our Troops!
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