I know this works for most people, but I'm guessing most people use the higher compression b20b (99+) or the equivalent b20z, but the car i just bought had the engine swapped by the previous owner to a lower compression 1997 b20b, and he says it's running a stock LS ecu. It runs ok but smells rich. I'm wondering if the lower compression calls for less fuel or a different tune. Anyone have a clue what I'm on about?

 

it might smell like that because it doesnt have a cat in the exhaust.

ive had 2 b20's running off ls ecu's. both were lean on cold start and at wide open throttle. the rest was good to go thanks to the o2 sensor. i had to get an adjustable fpr and pump the pressure a bit to get it as close as i could to acceptable afr while in open loop

 

Check to see if your car still has the charcoal canister on the firewall. If not, THAT is where the fuel smell is coming from...