Question about A/F ratios

[Onefast99gsx]

All were zip-tied except for that one. My bad. I backed the boost down to right about 20# just a bit ago. I can run her hard 60-90 with just about zero knock. If i go much over 20# like i was doing yesterday she'll start to knock in 3rd gear. Perhaps alky injection is only good in my car to 20psi. Either that or i'm over-running the stock FPR. I was hoping to boost to 23# with alky inj.