08/15/2025
Happy Friday ya’ll!!
The shop and dyno have been super busy this year and I’m behind of posting stuff but I’m working on getting things loaded up.
Here’s the latest tune I did. A customer had cams installed & tuned at another shop. After picking the bike up, the customer had numerous complaints on how the bike was running, check engine light being on after the work performed and primary making noise at idle. The customer took the bike back multiple times and was told “ you have a bad 02 sensor (light still stays on after new ones installed), the primary noise is normal and the tune is fine”.
So fast-forward, he got referred to ACS. What I found was the O2 sensors weren’t turned back on in the tune ( easy thing to miss, I’ve done it when I first started tuning), the tune itself was jacked up and multiple areas. And the AFR‘s were all over the place. The primary noise was due to the tune being way off, he was very lean in areas and also very rich in areas which was causing the bike to not run properly and causing the primary noise.
In the end we cleaned up the AFR’s and gained several hp and tq in the process. I would also like to mention the very minute dips that you see are half of an AFR/lambda which in our world is splitting hairs and doesn’t make much of a difference and the bike is happy. The dip in the very beginning of the sample is when the computer had an oh s**t we’re doing something moment and quickly recovered to where it needed to be within 200 RPM.
