Random lean spikes during boost at lower rpm

[BMWMD82]

So I'm hoping someone has some wisdom for me here. Was trying to dial in my MAF tonight after doing the "manifold switch" patch. My problem is that I keep encountering random lean spikes on the wideband. Typically, they're only one time per pull (3rd gear -- ~1800-6600 rpm), and usually around 3000-3500 rpm. Makes dialing in the MAF really tough in that region. It'll go from ~.75 lambda to .85 lambda or so when it happens, then the rest of the pull to redline is super smooth and my commanded vs. actual lambda are spot on.

This is on a '13 LS3 Corvette with a Magnuson Heartbeat @ 10.5 psi, headers, and ID850s, for what it's worth. I usually run methanol injection, but it was turned off and 10 degrees of max timing dialed in for this MAF tuning to keep things safe. My first thought on the spikes was that they could be misfires, but I didn't log any under my "total misfires" PID when the spikes were present. The spikes show up on the narrow bands as well, so it's not the wideband.

Any suggestions?

[GHuggins]

Think the ID850's have this weird problem, but no one is really sure why. Imagine something in the data is off for them? It's always a set amount of time after entering PE. There's a big investigation on here somewhere as to what causes it, but unsure if anyone ever came up with an answer?

[BMWMD82]

Thanks. Yeah, I think I just saw that thread. Though now I'm not so sure it isn't a misfire. screenshot.png

[Wicked]

Post your tune and the log.

[10_SS]

funny you bring this up... right after I applied the patch I started seeing this as well for the first 3-4 wot pulls but then it went away. but its limited to one single RPM (3500rpm). I have a bench simulator and I noticed setting the "supercharger fitted" option seems to do the same thing as "manifold patch" regarding injector delta.. but im wondering if just switching the Supercharger option yes will show the same problem... maybe the patch is intended for os without the supercharger fitted option?

Stock LS3 with Whipple injectors and whipple At 9psi. I assumed at first is was just my crappy 10% reduction in fueling blend job that I did when fist applying the patch... guess not?