If the tuner spends enough time you can get the AFR's very flat but do you think the engine needs the same AFR at 3000rpm WOT as it does at 8000rpm WOT ?.You need to look at the bigger picture NO 2 engines require the same AFR's and this is due to many factors.Now we could all sit here behind a keyboard and debate which is the perfect tuning AFR for power or part throttle and there will be no real winner as we all use different AFR's for tuning.We are currently looking at and have tested a hi speed 5 gas analzyer and exhaust gas temp setup but more on that setup later.
Regards Dyno Dave