Doubt about my A/F Ratio

pty370z

Hi everyone,

I have UpRev Cipher which I use to monitor the sensors in my Z and took advantage of the on-board wideband O2 sensors to check how my A/F ratio is during cruising and during acceleration all the way to red line..

My doubt starts here:
I've read many times throughout forum posts that as you install breathing bolt-on mods you end up having a leaner mixture..

AFAIK, the lower the number on the A/F ratio reading means it's RICH and the higher the number on the A/F ratio reading means it's LEAN.

So, during idle, for example, my A/F ratio is in the 14-15 range which is cool..

The thing is, when I push on the pedal and take it to red line my A/F ratio starts getting richer, and richer, and richer... At around 7,000rpm I'm looking at an A/F ratio of 10-11... IS THIS NORMAL?

Also, I noticed than when I let off the pedal and let the engine start decelerating, the A/F ratio bumped up and maxed out at constant 30. IS THIS NORMAL..??

I appreciate your comments and thanks in advance!

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2010 Solid Red 370Z * Touring-Sport-6MT * Black Interior
Performance: STILLEN * BERK * UR * MISHIMOTO * K&N * Z1 * ZSPEED * UPREV * DBA
Interior: GT-R Red Start/Stop Button * MSA Floor Mats * PW:JDM
Exterior: INGS+1 * SEIBON * FUJIMURA * PW:JDM * UAM * KICS * VOLK