FASTdan

I visited a new rolling road facility very close to where I live. Daytuner - specialises in bike powered kit cars. I was discussing my car and the issues I have with it (the over rich mid range fuel and the flat/lean spot at 50% throttle) and telling him the AFR's that I see (11.8 on boost, but richening to low 10's mid range) and he reckoned anything below 12 and he'd expect it to misfire! And that he'd tune it to 12-13AFR.
I'm pretty sure mine doesn't misfire on boost unless you get below 10 AFR, and I've ALWAYS been told to keep below 12AFR on boost. Am I misinformed here? I'd have thought 13 would be very dangerous?
I wonder if he's basing this on his experience on bike engines? I presume on a NA you need to be getting closer to optimum (12.6?) to get the best power?

Car is a turbo technics 1600CVH on a single, twin choke carb…...

GARETH T

tell him to stick to bike engines

FASTdan

thats what I thought! Thing is I was told he was good with carbs - but I'm thinking bike carbs, not 20yr old webbers lol.