Original mods on car , LS3 camaro, LT headers, LS9 cam, CAI.
After Whipple 2.9 twin screw install on car, Full whipple kit, came with Siemens Deka 63lb injectors, whipple tune with there injector data for the deka 63lbers, ZL1 pump and programmed FPCM with ZL1 settings.
Before install of whipple kit I dialed in MAF, car running in maf only, and o2 settings to eliminate surging with the o2 switching that was happening. Also adjusted min air flow for cam to tweak the idle a little bit.
Before whipple kit install, o2's switched together most of the time and fuel trims followed each other very closely at idle, light cruise , and acceleration. Within .5 to 1 percent bank to bank.
After whipple install I now see Bank 1 , (0 to -3 at idle) , and Bank 2 , (-6 to -9 ). In the scan they are never switching together and sometimes at light cruise are off bank to bank by 9-11 points.
It idles and drives fine but am worried about 1 bank running leaner than the other, especially if going into boost.
The IPW at idle is 1.1 to 1.3 ms side to side, same spread at light cruise. WOT the IPW reads within 2ms bank to bank usually both are the same, matching.
Smoked for vaccum leaks found nothing, no exhaust gaskets where touched during whipple install, plugs where whipple supplied denso IT22 gapped at 34, see an occasional miss show up on the scanner on different cylinders both banks ,random. Injectors, whipple supplied Deka 63lb with whipple supplied data.
Any opinions on the bank to bank fuel trim differences. Whipple PD blower issue? Deka injector issue? Install issue. Spark plug issue. 1.1 IPW too low effecting fuel feed?
Is this normal for a PD blower install for your fuel trims to go out bank to bank?
Any opinions would be appreciated.
Thanks