if you dont have any major mods done to your motor i dont think you're gonna benefit from the ls ecu. if anything your car will run very rich.
i used a gsr ecu for my sohc vtec for couple of days and the gas mileage was very very bad. the motor lost a lot of power in the top end because the gsr ecu was dumping more fuel than my sohc vtec could take. but otherwise it was fine. it idled good, revved to 8200rpm (i know its crazy for an internally stock d16y8) but it held up for quite a few days of abuse.
i used a gsr ecu for my sohc vtec for couple of days and the gas mileage was very very bad. the motor lost a lot of power in the top end because the gsr ecu was dumping more fuel than my sohc vtec could take. but otherwise it was fine. it idled good, revved to 8200rpm (i know its crazy for an internally stock d16y8) but it held up for quite a few days of abuse.