Sounds like similar issue others were having using the JB4 using a higher maps stacked with the Ford Tune. I would think using a lower level, like 3 or 4 as mentioned should help alleviate the spark knock issue.Wanted to follow up with more info on testing this over the weekend. The engine does exhibit a mild knock at low rpm when running the devices together. This may cause an issue over extended time of use. The knock events occur under low rpm high load, like tip in. Under wide open throttle like we tested on the Dyno, this is not an issue.
Just a reminder this is with 93 fuel, so running 91 or less octane could cause more issues unless you run a lower level on the Pulsar. So at this point, our calibrators are not condoning the use of the devices running in conjunction with each other.
I’d be interested to see 93 octane gas w/one step colder plugs would help. Maybe even going to E30? Won’t know for sure until it’s tested