Posted By: mickm
Latest six pack tuning... - 05/08/17 02:44 AM
So, the latest. For a re-cap, 540 Hemi with the mopar manifold and stock repo carbs.
I just went from the 66 jets to 64 in the center carb. AF went from ~13.4 to ~14.0 at cruise, ~12.2 to ~12.6 at WOT. I will go one or two more jet sizes as I'm looking for 12.8-13.2 on WOT, mid 14's fine with me on cruise.
Have gone through almost all the springs, there is always a bog when the secondaries kick in. More pronounced in the lower gears. Goes off the scale lean during the bog, but it least it is a short bog.
Secondaries kick in at 11Hg rolling into it slowly. Also, when 1/2 or more throttle before the secondaries, start to kick in, AF is mid 14's. That seems too lean to me for 1/2 throttle. So I'm going to put a 8.5 PV in next. I spent some time driving around with a vacuum gauge connected, and never saw it go below 11Hg until the secondaries kicked in. Also have a 6.5 PV if that is too much.
Idles well, starts immediately. Have a ways to go, but I'm getting there...
I just went from the 66 jets to 64 in the center carb. AF went from ~13.4 to ~14.0 at cruise, ~12.2 to ~12.6 at WOT. I will go one or two more jet sizes as I'm looking for 12.8-13.2 on WOT, mid 14's fine with me on cruise.
Have gone through almost all the springs, there is always a bog when the secondaries kick in. More pronounced in the lower gears. Goes off the scale lean during the bog, but it least it is a short bog.
Secondaries kick in at 11Hg rolling into it slowly. Also, when 1/2 or more throttle before the secondaries, start to kick in, AF is mid 14's. That seems too lean to me for 1/2 throttle. So I'm going to put a 8.5 PV in next. I spent some time driving around with a vacuum gauge connected, and never saw it go below 11Hg until the secondaries kicked in. Also have a 6.5 PV if that is too much.
Idles well, starts immediately. Have a ways to go, but I'm getting there...