WOT lambda numbers for a supercharged 5.0
10-29-2019, 05:54 PM
#1
Senior Member
Thread Starter
WOT lambda numbers for a supercharged 5.0
What should I be looking for regarding lambda (at WOT) for my supercharged 5.0 running on pump gas 93 (e10. My understanding e10 can have as little as 2 percent ethanol)
What multiplier do most tuners use to determine AFR on e10?
I need to know enough to review my own logs rather than having to depend on a tuner to always be available. I'm sure he's covered up with logs.
We're getting close to having the revised tune complete for the fuel system upgrade. The weather is preventing from finishing it up right now..
What multiplier do most tuners use to determine AFR on e10?
I need to know enough to review my own logs rather than having to depend on a tuner to always be available. I'm sure he's covered up with logs.
We're getting close to having the revised tune complete for the fuel system upgrade. The weather is preventing from finishing it up right now..
10-29-2019, 06:42 PM
#2
Senior Member
You don't use multipliers. Lambda is lambda. 1.0 lambda on e85 is 1.0 lambda on e10 gasoline
The difference is on e85 that's 9.6:1 afr and on e10 it's 14.06
Always read your datalogs in lambda, with a supercharger you should be tuned anywhere from .75 to .79 lambda.
The difference is on e85 that's 9.6:1 afr and on e10 it's 14.06
Always read your datalogs in lambda, with a supercharger you should be tuned anywhere from .75 to .79 lambda.
Last edited by w00t692; 10-29-2019 at 06:46 PM.
10-29-2019, 08:00 PM
#4
Originally Posted by rojizostang
What should I be looking for regarding lambda (at WOT) for my supercharged 5.0 running on pump gas 93 (e10. My understanding e10 can have as little as 2 percent ethanol)
What multiplier do most tuners use to determine AFR on e10?
I need to know enough to review my own logs rather than having to depend on a tuner to always be available. I'm sure he's covered up with logs.
We're getting close to having the revised tune complete for the fuel system upgrade. The weather is preventing from finishing it up right now..
What multiplier do most tuners use to determine AFR on e10?
I need to know enough to review my own logs rather than having to depend on a tuner to always be available. I'm sure he's covered up with logs.
We're getting close to having the revised tune complete for the fuel system upgrade. The weather is preventing from finishing it up right now..
10-29-2019, 08:13 PM
#5
Senior Member
Thread Starter
Anyway the newest revision stays around .79.
What do i need to look at besides measured AFR (lambda)? lambse, short term and long term fuel trims, and what numbers mean what and when?
Last edited by rojizostang; 10-29-2019 at 08:15 PM.
10-29-2019, 08:43 PM
#6
Say its commanding xx amount of fuel at commanded lambda your trims show what the computer is trimming to meet that target.... +stft means its leaner and adding that xx% to meet. And -stft means its rich and pull that indicated %
Usually when u run outta fuel it shows in the fuel psi and usually the fuel trims start climbing high when the computer is asking for more.
Might be a little off and corrected on it a little but that's the gist
10-29-2019, 08:51 PM
#7
Senior Member
Thread Starter
Stft and ltft are a measure of how well the VE is dialed in. Usually om factory threshold is +/-10 but tuned I like to see +/-5 and really dialed in is +/-2
Say its commanding xx amount of fuel at commanded lambda your trims show what the computer is trimming to meet that target.... +stft means its leaner and adding that xx% to meet. And -stft means its rich and pull that indicated %
Usually when u run outta fuel it shows in the fuel psi and usually the fuel trims start climbing high when the computer is asking for more.
Might be a little off and corrected on it a little but that's the gist
Say its commanding xx amount of fuel at commanded lambda your trims show what the computer is trimming to meet that target.... +stft means its leaner and adding that xx% to meet. And -stft means its rich and pull that indicated %
Usually when u run outta fuel it shows in the fuel psi and usually the fuel trims start climbing high when the computer is asking for more.
Might be a little off and corrected on it a little but that's the gist