Best is 437rwhp @ 5600 & 414rwtq @5400.

This was my first time tuning on a dyno, I didn't really get into it a lot. I only marginally tinkered with the timing and the secondary jets.

One of my runs were with 88 secondary jets and 34 total timing. That's when I got my best numbers. My A/F ratio graph indicates an average of around 11.7.

On another set of runs I had 92 secondary jets with the same timing. Had A/F graph showing me about 11.2 average. Well, its safe to say i'm heading the wrong way.

Can I draw the conclusion at this point that I can remove my 92 secondaries and retreat back to my 88s (giving me my original 11.7 average) and even dip below that to achieve an even leaner mix? If the difference between 88 and 92 took a half point away, maybe I can put it back to 88 and drop it down to 84 and increase it by a half point up to 12.2? Or even an 82 jet to bring it to 12.4 or 12.5?

Thanks in advance for your tips/tricks.





88 Jets w/ 34 total timing





92 Jets w/ 34 total timing





92 Jets w/ 38 total timing

 

Yes, your line of thinking is correct. I have limited experience with carbs, but with MPFI 13.0-13.2 AFR usually yields best power. With a carb, I would target 12.5 and then fine tune from there.
One thing I'll add: Are you certain your primary jets are correct? I'd make one wideband pull with the secondaries disabled to verify that first. If the priamaries are too large, effects of secondary jet size adjustment will be "diluted".

 

My primary jets are 80s. Car runs flawless at idle, no bogging and it has immediate response to throttle. It doesn't cough or sputter at stop lights even with the AC on. I want to believe that those are right where they need to be

 

Primary jet size has only a minimal effect on idle and off-idle response. Depending on carb size, your primary side feeds the engine up to ~400 cfm demand. You can compensate primary jetting with idle adjustments. Do that suggested step to get your overall curve correct.