jspaeth
06-03-2010, 09:38 PM
I am trying to work on my fuel maps......the higher RPMs are difficult to do without a steady-state dyno...
Anyway....technical question for the EXPERTS out there.
V.E. vs. RPM......does it change with manifold pressure?
Example....if I want constant 12.0:1 AFR at 10 psi in all RPMs, I would need to steadily add fuel up to where I achieve peak torque, and then after that, the V.E. drops off, and I could actually use less fuel to get same AFR, right?
Okay, assuming that I got that right, is there any reason to expect that the V.E. (or relative amounts of fuel at different RPMs at fixed manifold pressure) should be different at 0 psi compared to 10 psi compared to 20 psi?
I have a really good fuel map that allows me to achieve desired AFRs in the vacuum portion of my map, and I am seeing clear trends in where I need more fuel vs. RPM at fixed manifold pressure.....I am hoping I can apply these trends to the lower half (positive manifold pressure) of my map.....
Anyone have any insights?
Anyway....technical question for the EXPERTS out there.
V.E. vs. RPM......does it change with manifold pressure?
Example....if I want constant 12.0:1 AFR at 10 psi in all RPMs, I would need to steadily add fuel up to where I achieve peak torque, and then after that, the V.E. drops off, and I could actually use less fuel to get same AFR, right?
Okay, assuming that I got that right, is there any reason to expect that the V.E. (or relative amounts of fuel at different RPMs at fixed manifold pressure) should be different at 0 psi compared to 10 psi compared to 20 psi?
I have a really good fuel map that allows me to achieve desired AFRs in the vacuum portion of my map, and I am seeing clear trends in where I need more fuel vs. RPM at fixed manifold pressure.....I am hoping I can apply these trends to the lower half (positive manifold pressure) of my map.....
Anyone have any insights?