| Well see the question is the knock increasing as the speed of the vehicle is increasing or is the knock flashing 14 then coming down. See tranny shifts, suspension, belt tensioner, etc.. the motor has been pulled apart.. how do you know 100% exactly its been put back together with everything in the exact same location.
I would drop boost to like 18 and see if it runs clean there. Noting issues like fuel pressure, BLM', and watching the knock as the speed increases through a gear. Start with higher O2's like 780's and 18 PSI and see if it runs clean. If it doesnt, find out why? If it does then start upping the boost, fuel pressure,.. and watch the knock in the middle of third gear as the speed increases.. should be zero.. or less than a degree.
Every car is different. What one person can do doesnt mean someone else can do. There is a point whereby if you increase the alcohol into the motor it will start losing power. So the idea is to use only enough to get rid of detonation. If you drop fuel pressure and lean the motor out.. then you'll probably have to add alcohol to control the detonation. So in this aspect adding alcohol is fuel replacement.
Tuning on the street I like being conservative at set my goal in the 780-800 range as my safety cushion. At the track I will shoot for 740-760's with a motor thats not heat soaked. Some motors like 780's.. others like 720's.. I do notice the more mods like heads, cams, higher timing.. they tend to run higher O2's. Stockers seem to get away with lower O2's. Just depends. Watch your time slip, how the car reacts from 330, 1/8, 1/4.. and make decisions as to how its picking up. Make those changes accordingly in FP, timing, alky.
Hard to tell based on your post what changed from one day to another. I hope you can figure the issue.. let us know.
I have a lot of people that rely on the recall feature of the scanmaster.. it will record the highest knock registered..but if it happens on a shift??? its a useless number. Watch it rolling into the throttle.. if it comes fast then goes.. its not fueling but mechanical. Guys that run noisy cams know this for example.
HTH |