Flex fuel and WOT timing question

NorCalLT1 · 10-06-2020, 09:38 PM

i just installed my flex fuel sensor and i'm the stock tune. I was curious what timing people are seeing at WOT. when i looked at my data the ethonol content was 80% and my WOT timing was 21-22 dgrees. unfortunately i did not check timing when i was running straight 91 oct. so is this normal timing for 80% ethonol? right now i have an MSD intake, 95mm TB, rotofab, and the flex fuel sensor.

thanks

laynlo15 · 10-06-2020, 10:03 PM

Mine has 4 degrees added to the stock timing. As the E goes down such as when your someplace where E may not be available then the timing should come down at WOT depending on the amount it drops. On 72 percent my max timing when logging was 26.5 degrees.

NorCalLT1 · 10-06-2020, 10:14 PM

so any reason why mine is so low? I was at 80%.

Joshinator99 · 10-07-2020, 05:04 AM

Quote:

Originally Posted by NorCalLT1

so any reason why mine is so low? I was at 80%.

You say you’re on the stock tune. If you haven’t made any changes to the timing tables, you won’t see any additional timing from running E. There is a table that modifies your timing advance based on E content percentage.

NorCalLT1 · 10-07-2020, 08:12 AM

Ok, I thought from the factory it had a tune that advanced it a certain amount. Thanks

KingLT1 · 10-07-2020, 08:40 AM

The Flex spark table is there but it's not populated. You need to scale the stoich table and populate the Flex table. There are threads around here with the information on how to do it.

NorCalLT1 · 10-07-2020, 12:38 PM

Yes, i populated the stoich table for ethonol and i can see that the AFR is adjusted for whatever ethonol % is present as well.

Trochoidal · 10-07-2020, 08:19 PM

Quote:

Originally Posted by NorCalLT1

Yes, i populated the stoich table for ethonol and i can see that the AFR is adjusted for whatever ethonol % is present as well.

This might help you with your timing.

https://www.camaro6.com/forums/showthread.php?t=469951

10-06-2020, 09:38 PM	#1
NorCalLT1 Drives: SS Join Date: Aug 2019 Location: California Posts: 25	Flex fuel and WOT timing question i just installed my flex fuel sensor and i'm the stock tune. I was curious what timing people are seeing at WOT. when i looked at my data the ethonol content was 80% and my WOT timing was 21-22 dgrees. unfortunately i did not check timing when i was running straight 91 oct. so is this normal timing for 80% ethonol? right now i have an MSD intake, 95mm TB, rotofab, and the flex fuel sensor. thanks

10-06-2020, 10:03 PM	#2
laynlo15 Drives: 2022 Lt1 A10 Join Date: Nov 2015 Location: clark, mo Posts: 8,860	Mine has 4 degrees added to the stock timing. As the E goes down such as when your someplace where E may not be available then the timing should come down at WOT depending on the amount it drops. On 72 percent my max timing when logging was 26.5 degrees. __________________ 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

10-07-2020, 08:40 AM	#6
KingLT1 Drives: 2016 1SS NFG A8 Join Date: Aug 2017 Location: 46804 Posts: 6,797	The Flex spark table is there but it's not populated. You need to scale the stoich table and populate the Flex table. There are threads around here with the information on how to do it. __________________ 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

10-06-2020, 10:14 PM	#3
NorCalLT1 Drives: SS Join Date: Aug 2019 Location: California Posts: 25	so any reason why mine is so low? I was at 80%.

10-07-2020, 08:12 AM	#5
NorCalLT1 Drives: SS Join Date: Aug 2019 Location: California Posts: 25	Ok, I thought from the factory it had a tune that advanced it a certain amount. Thanks

10-07-2020, 12:38 PM	#7
NorCalLT1 Drives: SS Join Date: Aug 2019 Location: California Posts: 25	Yes, i populated the stoich table for ethonol and i can see that the AFR is adjusted for whatever ethonol % is present as well.

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