Hi guys I work for Norris Motorsports in Plainfield, IN and we have a customers 2003 mustang cobra in the shop that we had to finish putting back together because of another shop bailed on assembling the car, so in a nutshell the engine was already together and in the car but either way here is the list of what the car has:
ENGINE, MMR 4.75 long block, stock compression ratio, ported heads, comp cam stg2 blower cams degreed by MMR,
BLOWER, Kenne Bell 2.8H freshly rebuilt by PSE SUPERCHARGERS, 3.74 pulley, car also has Innovate west balancer w/2lb lower
AIR INTAKE, JLT High Boost intake w/ SCT BA3000 MAF
IGNITION, MSD coils and NGK TR6 plugs gapped 32
FUEL SYSTEM, Lethal Performance return system w/Walbro 465 pumps, pressure set at 42psi, has Ford Racing 80lbs injectors
EXHAUST, Bassani mid length headers, 2 1/2 bassani x-pipe going to magnaflow mufflers/tails
CLUTCH/TRANS, spec twin disc clutch and t56 magnum transmission
Car also has your typical cooling mods to the supercharger system and is also running a 170 degree T Stat.
So here is our issue with the car on the dyno and about 3-4k RPM the car just goes way rich and starts bucking/backfiring and today on the data log the timing went bonkers all over the place during the issue. No matter where you set the MAF scale it doesn't change car does same thing every time same RPM. Mind you I AM NOT THE TUNER I am the lead tech there and just looking for answers before yanking the factory ECM out and going stand alone. Any help would be appreciated
ENGINE, MMR 4.75 long block, stock compression ratio, ported heads, comp cam stg2 blower cams degreed by MMR,
BLOWER, Kenne Bell 2.8H freshly rebuilt by PSE SUPERCHARGERS, 3.74 pulley, car also has Innovate west balancer w/2lb lower
AIR INTAKE, JLT High Boost intake w/ SCT BA3000 MAF
IGNITION, MSD coils and NGK TR6 plugs gapped 32
FUEL SYSTEM, Lethal Performance return system w/Walbro 465 pumps, pressure set at 42psi, has Ford Racing 80lbs injectors
EXHAUST, Bassani mid length headers, 2 1/2 bassani x-pipe going to magnaflow mufflers/tails
CLUTCH/TRANS, spec twin disc clutch and t56 magnum transmission
Car also has your typical cooling mods to the supercharger system and is also running a 170 degree T Stat.
So here is our issue with the car on the dyno and about 3-4k RPM the car just goes way rich and starts bucking/backfiring and today on the data log the timing went bonkers all over the place during the issue. No matter where you set the MAF scale it doesn't change car does same thing every time same RPM. Mind you I AM NOT THE TUNER I am the lead tech there and just looking for answers before yanking the factory ECM out and going stand alone. Any help would be appreciated