Working on tuning the carb on the 440 in my super bee, I have an Innovate LM2 wideband with the sensor on the pass side collector. I had been having a lean condition (15+ afr) when going from cruise to light/medium acceleration, going from a 6.5 to 10.5 power valve cleared that up. I am now working on leaning out light throttle cruise, currently at about 12.0 AFR when maintaining speed from 2-3k rpm. This condition was identical before the PV change (vac is 15 at cruise so PV is for sure closed)
Primary T slots are square, the secondaries are not showing at all, exposing them would make the idle way to high. Should I close the primaries more (bringing them to less than square) and open secondaries?
Based on what I have read it seems like my next step would be adjusting the IFR's? Currently at 31, thinking about stepping down to 29. Do you typically change all 4 or should I start with just the primaries?
Car/Engine specs (how I bought the car)
69 Super Bee A833 4 Speed/3.55 gear/29" tire
440HP lower end with estimated 10:1 comp
Trickflow 240 heads
Comp Magnum 305H ([email protected], .525 lift, 110LSA)
Performer RPM manifold
Brawler 850 race
Dougs 2" headers/3" exhaust
MSD 6AL/Pro Billet Distributor/Blaster Coil
Timing is at 22 initial with a 14 advance bushing (36 total with 1 heavy silver and 1 blue spring), idle/vac will increase if I advance initial more but how much is too much?
Vac at idle is around 6-7, thinking this is related to the cam?
Vac at cruise is 15-16
Idle AFR is right around 13.0
Main jets are 72 and 84, I think I will end up dropping the 84s down but not worried about WOT just yet.
Primary T slots are square, the secondaries are not showing at all, exposing them would make the idle way to high. Should I close the primaries more (bringing them to less than square) and open secondaries?
Based on what I have read it seems like my next step would be adjusting the IFR's? Currently at 31, thinking about stepping down to 29. Do you typically change all 4 or should I start with just the primaries?
Car/Engine specs (how I bought the car)
69 Super Bee A833 4 Speed/3.55 gear/29" tire
440HP lower end with estimated 10:1 comp
Trickflow 240 heads
Comp Magnum 305H ([email protected], .525 lift, 110LSA)
Performer RPM manifold
Brawler 850 race
Dougs 2" headers/3" exhaust
MSD 6AL/Pro Billet Distributor/Blaster Coil
Timing is at 22 initial with a 14 advance bushing (36 total with 1 heavy silver and 1 blue spring), idle/vac will increase if I advance initial more but how much is too much?
Vac at idle is around 6-7, thinking this is related to the cam?
Vac at cruise is 15-16
Idle AFR is right around 13.0
Main jets are 72 and 84, I think I will end up dropping the 84s down but not worried about WOT just yet.