11 CTSV WOT spike issue

[99SLOWC5]

I have a 11 CTSV im helping tune and I have a lean spike I can not figure out. I haven't had my hands on a ton of Gen 4 cars so this is a quite a learning curve can anyone shed some light on this issue. At 3,700 i get a lean spike and I can not track it down

Car has
Ported supercharger
2.55 upper
9.1 lower
160 t stat
gutted cats
LPE GT9 cam
springs, pushrods
80# FIC injectors
New Era intake

11 black auto ctsv.hpt[email protected]

[99SLOWC5]

my latest scan, when my duty cycle jumps, my AF goes currently on that dyno pull from 12.5 to 10. I'm lost on why the increase in duty cycle. Is it because the MAF doesn't read past 86.69?

[SultanHassanMasTuning]

you need to enrich your maf before 11000 HZ as your o2 sensors are reporting a low 12 AFR.

at WOT your o2 sensors boosted should be 950+mv


also your timing is a bit low for the boost your running

also why are you commanding 12 AFR?

your PE should be 1. 28

also make enrichment ramp in 2.00

[Mike@G-Force]

Ive tuned MANY CTS-V's where are you located?

[99SLOWC5]

wisconsin

[99SLOWC5]

I was making head way commanded a 11.5 through PE, AF with the wideband on the dyno is 11.3-11.5 everything was going good added a little timing back. flashed it and now my AF tanks to 10.5 til 4200 and tanks to 10 after. Heres the current tune