11-14-2020, 10:21 PM | #1 |
Drives: 2017 ZL1 Join Date: Apr 2020
Location: South florida
Posts: 332
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Octane and Timing
today we logged a couple of pulls on my stock tune car. I am doing Ted jannetty flex fuel conversion next week. Right now I blend gt260 Sunoco with 93 to get around 96 octane. Todays log we saw up to 24.5 degrees of timing. I was surprised as I hear stock is usually around 20deg ? Also I have done LT's with cats and full exhaust, rotofab , and today I put the LT5 tb from jannetty. Other then turning off the rear cats, no tuning, no codes, and it runs like a scalded dog. I know Ted's tuning will help immensely though. So is that much timing unusual with stock tune ? The car seems to have learned to use the extra octane.
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2017 ZL1 M6 Silver Ice Metallic
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11-14-2020, 10:38 PM | #2 | |
ZL1 Believer
Drives: 2019 Camaro ZL1 Join Date: Oct 2020
Location: Bangkok, Thailand
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Quote:
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11-15-2020, 06:05 PM | #3 |
Drives: 2017 ZL1 Join Date: Apr 2020
Location: South florida
Posts: 332
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Any other input ?
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2017 ZL1 M6 Silver Ice Metallic
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11-15-2020, 08:06 PM | #4 | |
Drives: 2019 ZL1 Join Date: Mar 2019
Location: NJ
Posts: 1,534
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Quote:
24 degrees of timing at WOT at what rpm, what spark airmass and cylinder mass? |
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11-15-2020, 08:51 PM | #5 |
Drives: 2017 ZL1 Join Date: Apr 2020
Location: South florida
Posts: 332
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Around 6300rpm. Sorry I can't answer your other questions.
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2017 ZL1 M6 Silver Ice Metallic
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11-15-2020, 09:24 PM | #6 |
Drives: 2018 ZL1 Join Date: Oct 2019
Location: Texas
Posts: 83
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I think stock map on my 2018 the timing peaked at 22. I couldnt run anymore than 18 up top with my mods as it would knock a little. With E30 I run around 23 degrees up top with a 12.5 A/F ratio.
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2018 ZL1 A10 - Rotofab Intake, LT5 TB, TSP Headers, ATI Balancer, 9.1 Lower Pulley, JMS BAP, Flex Fuel.
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11-15-2020, 10:21 PM | #7 |
Drives: 2019 ZL1 Join Date: Mar 2019
Location: NJ
Posts: 1,534
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11-16-2020, 06:21 AM | #8 |
Drives: 2017 ZL1 Join Date: Apr 2020
Location: South florida
Posts: 332
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My mechanic buddy does. We just sent it to Ted .
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2017 ZL1 M6 Silver Ice Metallic
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11-16-2020, 10:57 AM | #9 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,764
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IME the ECU has a high and low octane table that is programmed from the factory. You won't ever get more timing then what is in that table(on non alcohol based fuels) combined with the IAT, Humidity, and ECT spark modifier tables.
What likely is happening is that the car is not getting full timing on pump gas. So the added octane is allowing you to get the full available timing.
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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 |
11-16-2020, 11:01 AM | #10 |
Drives: 2022 Lt1 A10 Join Date: Nov 2015
Location: clark, mo
Posts: 8,857
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My stock timing is about 22 or 23 degrees and my E85 timing adds 4 degrees max depending on the amount of E the sensor sees in the fuel line.
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2022 Lt1 6.2 A10, Maggie 2300, THPSI Port Inj/10 rib, Rotofab, E, Nickey, SCOL, Griptech, RC Bandits, Hoosiers/MT 9.80@142.96 1.44 60ft, 6.34@112 707/669 RWHP/TRQ. 16SS Maggie 2650 9.41@147 1.35 60ft, 5.99@119. 16 C7 A8 10.90@128 Bolt on stuff
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11-16-2020, 01:34 PM | #11 |
Drives: 2017 ZL1 Join Date: Apr 2020
Location: South florida
Posts: 332
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Great info, I will let you know how Ted's flex fuel program works out. Waiting on the jsm booster which will be here tomorrow. The car loves the blended gt260 at 6 gals 100 and 13 gals 93. But at 9.59 a gallon it gets expensive. I drive the car quite a bit. Thanks
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2017 ZL1 M6 Silver Ice Metallic
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11-16-2020, 03:44 PM | #12 |
Drives: 80 Z28 - 93 Z28 - 14 Camaro SS-RS Join Date: Sep 2016
Location: Fayette Maine
Posts: 387
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My SS had two timing tables and it would get stuck on the low timing table if you put bad fuel in it. Do the 2018 ZL1s have the same issue and you have to do the fuse pull?
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11-16-2020, 03:58 PM | #13 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,764
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no you don't have to pull a fuse, put good octane back in it and it will revert back to the high octane table.
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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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