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09-03-2020, 08:44 AM
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#1 |
 Drives: 2012 BMW 135i Join Date: Nov 2016
Location: MD
Posts: 396
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Throttle plate closing
Hi all -
After two laps on track (flyers, hot laps) i observed the car closing my throttle plate. I would command 100% throttle but after 6k RPM it would begin to close the throttle plate to 80%. Has anyone seen this behavior and know what to chase? Humidity was high - 90%; IAT reported at 78. |
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09-03-2020, 09:05 AM
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#2 |
 
Drives: '19 ZLE, S54 E36M3 Join Date: Feb 2018
Location: North Augusta, SC
Posts: 227
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Can't say on these cars, but that's normal on my VW as a means of managing boost/torque. Can't tell it while driving, but the logs clearly show it. I would think it would be unncessary with the SC, but....
IAT only 78? Must be nice. Ambient here has been higher than that at 3AM lately. |
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09-03-2020, 09:08 AM
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#3 |
          
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,838
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Normal with stock tune ZL1's.
__________________
2016 NFG 1SS A8
Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA |
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09-03-2020, 11:11 AM
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#4 |
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Drives: 2012 BMW 135i Join Date: Nov 2016
Location: MD
Posts: 396
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thanks for confirming its normal behavior - i've never seen it in the data before but RaceChrono was just updated so maybe somehow its making its way into the data. My first two laps clearly has the plate all the way open so i suspected its normal behavior.
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09-03-2020, 11:20 AM
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#5 |
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Former GM Technician
Drives: 2018 ZL1 A10, 06 Silverado Duramax Join Date: Sep 2009
Location: Switzerland
Posts: 343
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If there is too much knock retard, the throttle will also close some degrees.
__________________
2018 Camaro ZL1 A10
Rotofab Big Gulp, Nick Williams 103, Magnuson 2650, 9.17" (14%) lower, 90mm upper, Vengeance Racing Heads (LME) Cam Package (Cammotion Stage 1), Johnson Lifters, JMS Voltage Booster, Lingenfelter high flow check valve, BBK shorty headers, Custom 2.75" down pipes, Gesi Gen2 high flow cats, MM catch can 791whp, 772ft-lbs SAE Just added 30% XDI Injectors, LPE big bore hpfp, Flex fuel. Elite tuning, results coming soon. 2006 Silverado Duramax Diesel MPI Compound Turbo 40% over Injectors Efi Live DSP5 Tuning Follow me on Instagram: Swisstyphoon1980 |
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09-03-2020, 11:30 AM
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#6 | |
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Drives: 2012 BMW 135i Join Date: Nov 2016
Location: MD
Posts: 396
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Quote:
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09-04-2020, 05:35 AM
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#7 | |
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Former GM Technician
Drives: 2018 ZL1 A10, 06 Silverado Duramax Join Date: Sep 2009
Location: Switzerland
Posts: 343
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Quote:
Bad / low octane fuel. And yes, heat also. Your issue could be from high iat's. But like others already mentioned that is normal.
__________________
2018 Camaro ZL1 A10
Rotofab Big Gulp, Nick Williams 103, Magnuson 2650, 9.17" (14%) lower, 90mm upper, Vengeance Racing Heads (LME) Cam Package (Cammotion Stage 1), Johnson Lifters, JMS Voltage Booster, Lingenfelter high flow check valve, BBK shorty headers, Custom 2.75" down pipes, Gesi Gen2 high flow cats, MM catch can 791whp, 772ft-lbs SAE Just added 30% XDI Injectors, LPE big bore hpfp, Flex fuel. Elite tuning, results coming soon. 2006 Silverado Duramax Diesel MPI Compound Turbo 40% over Injectors Efi Live DSP5 Tuning Follow me on Instagram: Swisstyphoon1980 |
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