What should AFR be at Cruise?
CRUISING: 14 AFR Most stock to slightly modified engines will run just fine at an AFR of 15 and yield better MPG. If you prefer better PERFORMANCE then we suggest to run an AFR of 14 or even richer to around 13.
Is 13 AFR too lean?
Best performance for most vehicles is in the 12.5 to 13 AFR range. Going too rich will have the opposite affect and decrease your performance. Getting up to cruising speed or getting ready to pass someone, you usually are looking for the performance to get up and go. Best performance for most vehicles is around 12 AFR.
Is 17 AFR too lean?
But that’s in an ideal world, one where every molecule of fuel and oxygen is completely consumed during every single combustion event. In a real engine, a 14.7:1 air-fuel ratio is a little too lean. If you lean out past 14.7:1, all the way to something like 17:1, your engine will run cooler again.
What is the perfect AFR?
The ideal air-fuel ratio that burns all fuel without excess air is 14.7:1. This is referred to as the “stoichiometric” mixture.
What AFR makes the most power?
A naturally aspirated engine, running on pump gasoline will normally make the most horsepower at an AFR of about 12.8 – 13.0. An AFR of about 14.6 will produce the best fuel economy.
Is it better to run lean or rich?
TLDR – running just a little lean could improve fuel economy and give extra power. However, run too lean and you risk engine failure because the engine runs too hot. Whereas running rich can waste fuel and increase pollution but will not damage the engine.
Is AFR 14.6 good?
An AFR of about 14.6 will produce the best fuel economy. Dynojet normally creates tunes with AFR’s of 12.8 at high load/rpm areas, AFR’s around 14.6 at low load areas, and AFR’s between those numbers at other areas.
What is considered lean AFR?
Any mixture greater than 14.7:1 is considered a lean mixture; any less than 14.7:1 is a rich mixture – given perfect (ideal) “test” fuel (gasoline consisting of solely n-heptane and iso-octane).
Is it better to run rich or lean?
Can running Rich damage engine?
In a healthy engine, nearly all the fuel that enters the cylinder is burned during the combustion. With a rich mixture, unburned fuel is left inside the cylinder. This causes friction to built up between the pistons and cylinder walls, leading to damage.
What is too lean AFR?
When an air/fuel mixture has too much fuel, it is rich. When there is not enough fuel, it is lean. An AFR higher than stoich = lean. An AFR lower than stoich = rich. A lambda value higher than 1 = lean.
What is the AFR poster contest?
The AFR Youth Program captures the creativity of students with our annual AFR Poster Contest. The contest begins in the fall and any 1 st – 4 th grade student is eligible to participate. Order forms are due October 29, 2021 and posters are due December 3, 2021.
What is the AFR AG achievement contest?
The AFR Ag Achievement Contest at the Oklahoma Youth Expo is designed to recognize youth who have an interest in livestock, excel in showmanship and have knowledge of the livestock industry including production, management, processing and end product utilization.
When do I post my top winners for AFR?
Top winners will be recognized at the annual AFR Convention in February 11-13, 2022. Posters must be post marked by December 3 in order to be judged. Oklahoma State University Collegiate AFR (CAFR) is a newly established program for AFR members to continue their involvement after graduating from high school.
What AFR should I target at idle and cruise?
I’m just after some ideas on what a reasonably safe AFR I could target at idle and at cruise (under about 3000 rpm and off boost), engine is an RB25DET NEO. Thanks in advance. You should really be targeting stoichiometric 14.7, lambda 1 on normal pump fuel for cruise and idle.