15:1 is a horrible AFR for wide open throttle. when youre running it hard you should be in the mid to high 11s. a few guys run about 12.2-12.4, but that is running on the ragged edge of too lean. a boosted car is different from an n/a car in being that you need to use more fuel when youre running hard. the 15:1 ish is good for idling and cruising, but when you start hammering on it the AFR should come down a bunch.
we are all just trying to help here, no mock. dont get frustrated. clubgp is for people to get mocked and told they are wrong. we are just pointing out that a 15:1 AFR will lead to a blown engine if that is really what youre running.