Sharp knock counts

[Rodman]

I have my FP set @ 38lbs with the vac hose off. What I am noticing now, is a sharp knock count when I'm at partial throttle and then 'nail' it, my logger shows a lean condition at that point followed shortly by a richer mix. Is my base FP too low? It feels like the fuel is not reaching the cylinders fast enough at those times. If I add FP, won't I get faster fuel response into the cylinders? Or should I change my throttle points? OTHER THAN THIS PROBLEM, MY CAR IS TUNED VERY WELL. I would love to post my logger graphs, but I can't get the logs saved in the right format.

 

[jdmawd]

I have my FP set @ 38lbs with the vac hose off. What I am noticing now, is a sharp knock count when I'm at partial throttle and then 'nail' it, my logger shows a lean condition at that point followed shortly by a richer mix. Is my base FP too low? It feels like the fuel is not reaching the cylinders fast enough

Fuel pressure should be monitored, from in the car wile driving. If you are having fuel delivery problems, you need to know if fuel is flowing properly, and that pressure is rising incrementally with boost. under hood FP gauges are about as good as no gauge at all. also what size turbo,injecters and fuel pump are you running. what boost level does this problem occur at. once you veryfiy that your fuel pressure is ok then add fuel where you are lean.