SD tuning

hey fellas I’m still very new this so hope this isn’t a stupid question but I have opened up the tune file on my ve ss which has a cam extractors Otr which was done before I bought it and I wasn’t able to get any info about it all, but I noticed the maf was missing and has the patch with the intake temp sensor so I assumed it was tuned in speed density.. but in the tune file in OS it asks to apply the code modification for speed density? Which makes me think maybe something is wrong here? Also after I had a look I just changed the speedo calibrations for my wheels put it back in and now I’m getting a code saying mass or volume air flow A circuit low? Kinda lost now any help would be appreciated cheers

Hi Jake it might be easiest to start by posting up the stock calibration that you downloaded so we can see what's been done. There are a couple of options when it comes to performing an SD tune and you don't necessarily need to apply the SD patch. Give us some more info on the vehicle too and we will be able to help.

hi mate thanks for answering, the car is a ve commodore L98 6.0l 6 speed auto, it has a twin 3" system with extractors, OTR, 25% under driven and a cam but there is no information on the cam or what is inside the engine as the previous owner passed away, it has the stock ecu and am tuning with hp tuners mpvi2, iv attached the calibration below any more info or hints would be greatly appreciated thanks