TBI Tuning for dummies?

[dave w]

Perhaps a brief description of what your tuning will help. Year / Make / Model / Engine / Transmission / ECM or PCM information.

That helps with knowing what TunerPro files are to be used. Then the uphill fun begins.

dave w

[IamBrad]

Perhaps a brief description of what your tuning will help. Year / Make / Model / Engine / Transmission / ECM or PCM information.

That helps with knowing what TunerPro files are to be used. Then the uphill fun begins.

dave w

It's a 1994 C1500 with a 305 and 4L60e. the PCM is 16196395 and the bin is BHMD. The engine is stock. I did add some shorty headers, high flow cat and did the Ultimate TBI mod. I did add a TBI spacer but that was more to be able to clear the distributor after removing the collar that the TBI units have.

Future upgrades will be a mild roller cam .447/.459 lift with 201/208 duration. I have some 081 heads also with larger intake values but I'm not sure I'm going to use them yet. Because I'm more interested in low end torque than high end HP.

[dave w]

It's a 1994 C1500 with a 305 and 4L60e. the PCM is 16196395 and the bin is BHMD. The engine is stock. I did add some shorty headers, high flow cat and did the Ultimate TBI mod. I did add a TBI spacer but that was more to be able to clear the distributor after removing the collar that the TBI units have.

Future upgrades will be a mild roller cam .447/.459 lift with 201/208 duration. I have some 081 heads also with larger intake values but I'm not sure I'm going to use them yet. Because I'm more interested in low end torque than high end HP.

I'm slightly confused, 16196395 is usually $OE definition for a 4L80E : http://www.gearhead-efi.com/Fuel-Inj...Information-OE

What I was able to find is BHMD is listed for $OD 16197427 : http://www.gearhead-efi.com/Fuel-Inj...Information-0D

There is information showing the 16196395 will work with $OD BHMD, but I don't have personal experience to verify 16196395 will work with $OD BHMD. Perhaps using 16197427 would be an option?

The overriding factor is BHMD is $OD, so tuning with $OD is the path forward.
TunerPro RT File Type: adx A217 $0D TP5 v250.adx
TunerPro RT File Type: xdf Advanced $0D TP5 v251.xdf

[IamBrad]

I'm slightly confused, 16196395 is usually $OE definition for a 4L80E : http://www.gearhead-efi.com/Fuel-Inj...Information-OE

What I was able to find is BHMD is listed for $OD 16197427 : http://www.gearhead-efi.com/Fuel-Inj...Information-0D

There is information showing the 16196395 will work with $OD BHMD, but I don't have personal experience to verify 16196395 will work with $OD BHMD. Perhaps using 16197427 would be an option?

Haha you and me both. It took me about a day to figure that out. Everything was telling me it should be $0E and that it was only used in HD trucks with the 4L80E. But I guess GM didn't pay attention to that. Anyway the $0D stuff seems to work well.

[dave w]

Next step is to post a data log. Advanced tuners often use Air Fuel Ratios to tune with: http://www.gearhead-efi.com/Fuel-Inj...ng-Spreadsheet

[mihela]

8625, 7427 and 6395 are mostly interchangeable and all can run $0E, $0D, and $31 code. $0D is for a 4L60E, $0E and $31 are for the 4L80E. I would start with the latest 1995 code for your truck combination as a base for your tune and work from there. Do you have a wideband? It's possible to tap its 0-5 volt output to the EGR position sensor wiring and hack it into the datastream in place of battery voltage. Then you can feed the datalog into a spreadsheet to help you tune the VE table. That's more accurate than BLM tuning.

[In-Tech]

8625, 7427 and 6395 are mostly interchangeable and all can run $0E, $0D, and $31 code. $0D is for a 4L60E, $0E and $31 are for the 4L80E. I would start with the latest 1995 code for your truck combination as a base for your tune and work from there. Do you have a wideband? It's possible to tap its 0-5 volt output to the EGR position sensor wiring and hack it into the datastream in place of battery voltage. Then you can feed the datalog into a spreadsheet to help you tune the VE table. That's more accurate than BLM tuning.

If your transmission is a '94 DON'T use a '95 file, the transmission changed in '95.