First drive of 2012 with the following changes: Swapped FBO ECU for MSD Steet Fire ignition box Swapped old FBO dist for FBO dist with VA Cool Carb heat shield
Last year, I finished up with A/F readings from 30mph to 60mph in the 14.2-14.6 range. 3500/4000rpms was consistant at 14.2. 50mph-WOT showed rich spike into the low 12's and then my WOT shift points leaned out a little to 12.6. My cruise to decel showed rich into the 12's. A couple of you suggested swapping to a vacuum advance distributor and that leaned out the cruise to decel A/F reading into the upper 13's.
My main goal this year is to get my 30-60mph cruising into the mid 14's to low 15's. I also want my WOT shift points around the 12.8/13.0 range.
I got two test drives in today in 65 degree weather. Once I retuned the carb to 13.6/13.8 in D, then I took notes at the following mph. 30:14.2 40:14.6-15.2 50:14.6/14.8 60:14.0 3500/4000rpms: 13.8 50-WOT: spiked to low 12's then leaned out to 12.8/13.2 at shift point Light accel mid to upper 13's Heavy accel high 12's
Something made my numbers go rich and my idle at a stop was acting up. When I got home I found my rear float WAY too high and it ended up have a piece of crud in it. I opted to change the primary jets from 62's to 60's and my pvcr's from .065" to .069's. I mainly wanted to lean out my cruising just a tad more and lean out my 3500/4000rpms into the 14's.
My second test drive showed the following changes after retuning my in D A/F to 13.2/13.4: 30: 14.2 40: 14.6-14.8 45: 15.4-15.8 50: 15.2-15.6 60: 14.4 3500/4000rpms: 14.2 50-WOT: No rich spike, A/F went directly to 13.0 and stayed at 13.0 until shift point Light accel 13.8-14.2 Heavy accel low to mid 13's
I like most of what is shown above except for the readings leaner than 15.4 which gave me some slight surging. I am going to swap out my .065" IAB's for some .060"'s to see if it will richen up the 45-50mph cruise just a touch. The car loves the extra timing at idle (was 24, now 32 with VA hooked up to manifold vacuum) and it idles much smoother in the 13.2/13.4 range in D with foot on the brake (like at a stop).
