kenne bell feul pressure setting?

[mac7290]

just got a 91 coupe with a s/c 9# boost(kenne bell) it has stock injectors (19#) maf and t/b. the feul pressure with the vacuum off is at 64# which seems really high vacuum on is around 50#. seems to run rich(black smoke and gas smell)it has the k/b fmu. feul preesure will go to about 80# with boost. i know a dyno tune or a wide band are the best way but out of my means right now.) just trying to find some baselines. any ideas or suggestions are appreciated. thanks

 

[Daggar]

Your intial fuel pressure should be at stock setting. You should also be running a boost-a-pump or larger than stock fuel pump. Let the FMU do the work of providing the fuel pressure for when it's in boost. 9 lbs from a KB is too much for 19 lb injectors. If you're truly getting 9 lbs of boost then you may want to swap to a larger pulley (reduce boost) before you lean out and blow it up.