I am getting back into a tune after a medical issue and I am hoping you may be able to assist me.
I have a 95 GMC sierra with a big block 454 30/1000's over, edelbrock MPFI with 36 lb injectors (edel 3636). the heads are edelbrock performers and the bottom end now has flat top pistons yielding a 9.2:1 compression ratio. The cam is a comp cams roller cam (Mild 264 grind) with roller rockers up top. I have a Thorley tri-wye header system with a single Gibson exhaust (3 inch) and a K&N FIPK intake system. The computer (PCM) is a 16197427 with the BMHM code and the TBI to MPFI chip (1389.BIN) from edelbrock is a $31 mask
I am using tunerPro RT with a moate s autoprom APU1 burner/logger/emulator and an Innovate wideband O2 sensor with analog outputs for datalogging as well as a meter for visual use. I will be welding in a bung for the wideband O2 sensor this weekend.
I have modified the memcal resistor pack with the jumper as advised and the PCM driver resistors have been removed and replaced with 18 Ga. buss wire jumpers.
The mask is a $31 and I can find lots of software change requirements info on the forums for TBI to MPFI conversion tunes on the $0D/$E6/$OE mask for TBI to MPFI conversions but not much on the $31 mask and 7427 PCM software change requirements for the TBI to MPFI Conversions.
I have attached the current bin file which originally was the edelbrock supplied Bin file (1389.BIN) and the MPFI modified BIN (chip7_MPFI_2_19_15X2.bin) with software flags and scalers changed as best as I could figure them out from the $0D Bin file changes required from info available on the forums from people who have successfully made the TBI to MPFI mods on their $0D masks, but they are not directly translatable to the $31 mask
I have attached the original edelbrock Bin (1389.bin), the current (chip7_MPFI_2_19_15X2.bin) modified as best I could) Bin with course tuning done, the XDF file (31_TPV5_v250.xdf) and the ADX (A220_0E_31_Trans2_v250.adx) file required by tunerPro to examine the current Bin file
I would appreciate a check of the the software changes made on the $31 mask Bin file (chip7_MPFI_2_19_15X2.bin) and let me know if I have the changes straight I would be eternally grateful for any assistance and advice to zero in closer on the tune before I send the truck off to a local dyno shop for precision tuning.