s300 tune help, datalog review
Posted: Wed Sep 13, 2023 12:12 pm
Hello, first time poster here forgive me if this is in the wrong place
I just swapped a stock b18b into an 99 hatch and am just trying to get a tune to drive on for the rest of the season before i go turbo / dyno tune next spring. Im pretty new to the whole tuning side of things. the only things not stock are header and exhaust, and the stock o2 sensor is gone replaced with aem x series wired to ELD. Also have walbro 255 and aem FPR set to stock fuel pressure. I used a timing light to get the timing to 16 degree spec. the car idles well and it drives okay too. However, there is aggressive popping / backfire whenever i let off throttle to shift gears. I have attached a datalog as well as my calibration here. I am too scared to rev high or give it throttle right now so sorry if its not enough to go on. I pulled the timing back a little from the stock just to be safe. If someone could go over the log and let me know why the backfiring is happening or if there are any serious issues with the current map it would be greatly appreciated
I notice on the log there is a bit of a fuel spike at the top of of each acceleration right as / before i let off throttle. maybe this is causing the backfires? If so how might I fix this
I just swapped a stock b18b into an 99 hatch and am just trying to get a tune to drive on for the rest of the season before i go turbo / dyno tune next spring. Im pretty new to the whole tuning side of things. the only things not stock are header and exhaust, and the stock o2 sensor is gone replaced with aem x series wired to ELD. Also have walbro 255 and aem FPR set to stock fuel pressure. I used a timing light to get the timing to 16 degree spec. the car idles well and it drives okay too. However, there is aggressive popping / backfire whenever i let off throttle to shift gears. I have attached a datalog as well as my calibration here. I am too scared to rev high or give it throttle right now so sorry if its not enough to go on. I pulled the timing back a little from the stock just to be safe. If someone could go over the log and let me know why the backfiring is happening or if there are any serious issues with the current map it would be greatly appreciated
I notice on the log there is a bit of a fuel spike at the top of of each acceleration right as / before i let off throttle. maybe this is causing the backfires? If so how might I fix this