I just finished rebuilding LNF in my solstice over the winter. I have heavier valve springs, so I went with Bates solid lifters. Now, I get alot of KR, more than I did before the build which almost non existant. From about 1500 rpm to 3500rpm 15% load up to 60% load. I keep pulling timing but it doesnt get any better. Im thinking it has to be False KR, mayber from the chatter of the solid lifters. Also, anytime you let off the gas then barely get back into the trottle, you'll get KR for a secong there too.
Some more info on this engine so that it may help someone that is more experienced in tuning then me, as Im just a beginner at this. The engine has forged I-beam rods, Wiseco LNF forged pistons. Ported head, Ferrera stainless valves, 82# valve springs, ZZP stage 1 cams with lobe. port matched intake and exhaust manifold, EFR 6758 Turbo, 3' downpipe with Solo Street race exhaust. And a fifth injector setup that I copied from GMTECH post on it. Ive calibrated the MAF and the STFT ar within 2%. But I keep pulling timing out of those cells that keep showing KR, and nothing helps. Ive clocked the knock sensors at 9'oclock. I may go an start moving them around to see if there are any changes. I will post logs later when IM at home. Oh, and Im running E85, its the only ethanol I can get in 100 miles.
Any ideas would be helpful as Im just starting to get into to tuning.