I had to run a boost a pump, and an adjustable fpr. Could not get good fueling after a certain point (I think 16ish psi). I can’t remember max pressure of the stock fpr, but it was too low at some point. Tuning was really all over the map. Once I raised fuel pressure up top it fixed the problem and tuning was cake. 12.0 is really not all that bad, but you’ll loose less by being too rich than too lean…and it’s safer. 11.5-8 was a good happy medium on an l67Glad I went with the 450 pump then. 12.0 doesn't seem that lean to me but I supposed at that boost level it doesn't take much. It really dropped hard when it went to 17 psi up until that point it was kinda slowly tapering off
8 to 11 max I'd say it averaged 9. When it kr'd it pulled back to 6 and as soon as that happened boost spiked from 17 to 23 and kr went to 9 and buried timing. I really think this was mostly maf related as I'd never seen it flatline the way it did as soon as I hit the pedal and I didn't change fuel enough from the prior run near that drastically. I've also had that maf well over 50lbs/min so I don't understand why it just sat there right under 40. Fuel was commanded at 11.5 as I felt that was a safer zone and prior experience has shown me there isn't that much hp difference to make up for the risk of trying to ride a 12.0How much timing were you running?