I'm in the process of tuning a new 402 I just installed. It is topped with a TVS 1900 and has a pretty mild camshaft (219/235 .625/.622 113+1) Right now I am tuning idle and part thottle since the engine isn't broken in yet.

My first question is why do my narrowband O2 signals look so erratic and why do they not always follow each other. I have a wideband in each bank, different manufactures so I expect a little variance between the two. For the most part they are close enough to each other.

Second in the picture I added my NGK wideband in bank 2 is pretty close to my AEM wideband in bank 1 but the Narrowbands are the complete opposite of each other. Just not sure if I should be concerned of this for when I go back to closed loop. I really don't want to have to go and manipulate the rich/lean switching voltages blindly or if I don't even need to.

Thanks.

cruise home 31 july 14.hpl
G8 402 MAF TUNE 31 JUL 14.hpt
NGK Wideband 14.68 cmd afr.cfg
O2 split.jpg