Does gearing affect AFRs?
Thread Starter
Melting Slicks
Joined: Mar 2006
Posts: 2,754
Likes: 380
From: South Florida FL
Does gearing affect AFRs?
Basically I'm trying to find if tuning in 3rd gear compared to 4th affect A/FRs? since I street/track tune an only get full 1st tru 3rd gear passes.
so how does the load difference affect AFRs?
so how does the load difference affect AFRs?
Pro
Joined: Feb 2007
Posts: 702
Likes: 1
From: Frankfort Il
The load in third gear should be close enough to fourth gear, that you'd be good. The reason we do dyno pulls in 4th (manual, 3rd auto) is because that is the gear that gives the drivetrain a 1:1 ratio for more accurate dyno numbers.
First and Second tend to be a little leaner do the lighter engine load. It's pretty cool seeing the the AFR plotted on a graph over time like we can do with our Mustang Dyno's 1/4 Simulation. Where we might be at 13.0:1 AFR in fourth during our HP Tests, we could be 13.2:1 in the lower gears during a 1/4 Simulation.
First and Second tend to be a little leaner do the lighter engine load. It's pretty cool seeing the the AFR plotted on a graph over time like we can do with our Mustang Dyno's 1/4 Simulation. Where we might be at 13.0:1 AFR in fourth during our HP Tests, we could be 13.2:1 in the lower gears during a 1/4 Simulation.
