Meep-Meep
дворянин
My buddy has this slick gadget made by Innovate Motorsports that uses a heated O2 sensor and converts the sensor mV output to A/F ratio in real time. It also has the ability to record and save tons of data. The unit is powered by the cigarette lighter, or at least it was after I fixed the lighter socket, and is pretty easy to hook up and get readings. The only problem is the cord from the tail pipe sensor to the LM1 is too short so for me to see anything I had to glance between the door and drivers seat. Not ideal under full power acceleration!
The 66 HEMI Charger wasn't doing anything at the moment so I stuck a probe up it's butt and went for a cruse. My suspicion was correct in that it's very lean at times so now I just have to figure out where. Most of the lean condition is right around tip in, which makes me wonder if the low speed jet needs to be opened up a bit. I'm running the original 66 hemi carbs with stock calibration, and knowing that they didn't have our special CA designer blend of 91 unleaded to set them up when they were new, I'm not going to rule out some major changes. I will fiddle with the usual suspects first.
I put in the stock metering rod springs (stiffer) and saw a slight improvement, but from what I saw before the spring change were A/F ratios in the 15:1 range and leaner while cruising under very light loads or slight down hill. Idle was about 13.5:1 and that confirms I can still adjust a carb or two by ear. Cracking the throttle open under load long enough to get past the pump shot recorded the mixture to be in the mid 12.5:1. Not too bad.
I'm going to see if I can get a longer cable so I can have the instrument up front where I can see it, but for now I at least got an idea what's going on. This is just the beginning so stay tuned!
The 66 HEMI Charger wasn't doing anything at the moment so I stuck a probe up it's butt and went for a cruse. My suspicion was correct in that it's very lean at times so now I just have to figure out where. Most of the lean condition is right around tip in, which makes me wonder if the low speed jet needs to be opened up a bit. I'm running the original 66 hemi carbs with stock calibration, and knowing that they didn't have our special CA designer blend of 91 unleaded to set them up when they were new, I'm not going to rule out some major changes. I will fiddle with the usual suspects first.
I put in the stock metering rod springs (stiffer) and saw a slight improvement, but from what I saw before the spring change were A/F ratios in the 15:1 range and leaner while cruising under very light loads or slight down hill. Idle was about 13.5:1 and that confirms I can still adjust a carb or two by ear. Cracking the throttle open under load long enough to get past the pump shot recorded the mixture to be in the mid 12.5:1. Not too bad.
I'm going to see if I can get a longer cable so I can have the instrument up front where I can see it, but for now I at least got an idea what's going on. This is just the beginning so stay tuned!
