93 vs 95 454 fuel injectors

[lvdaytona]

I need some input on a tbi swap my dad and I have done. 1983 c3500 originally had a diesel engine. we bought it with a carburetor 454 already in place. Decided to go fuel injection, bought everything from a 1993 c3500 454 tbi. Installed this combo, and truck ran just fine. Fast forward a year, Dad decides that the turbo 400 needs to be replaced with 4l80e. I found a new 95 ecu and prom for 1995 454 4l80e combo. Re-pin ecm connectors to 1995 schematic. Now truck will idle, but when you increase rpm, it falls on it's face. Injector pattern goes from nice open cone to a tight cone, looks like it is dumping fuel. Not sure, but am thinking that the 95 ecm is supposed to control bigger psi injectors, not the 9-13 psi it has now. So....need to know if I should swap the 93 fuel delivery(injectors, regulator, pump) to a 95 30 psi set up. If so, are the 93 injectors physically the same as 95 injectors, or do I need to find a 95 injector pod?? any advice appreciated.

[In-Tech]

Can you post the .bin from the '93 and the .bin from the '95 you are using? Broadcast code on the chips would save a bit of time if you have them.

[dave w]

Gearhead-efi Injector Flow information: http://www.gearhead-efi.com/Fuel-Inj...d-part-numbers

According to the link above, the 93 injectors are: 17084304 - Black / Blue - 74pph - 7.4L / 454 - 91-93

According to the link above, the 95 injectors are: 17104288 - Pink / Purple - 46pph @13psi - 7.4L / 454 - 94-95 *NOTE: Came with 30 PSI regulator used @ 26-32psi for 67-72pph
__________________________________________________ ______________

GM used different computers for the 4L80E:
http://www.gearhead-efi.com/Fuel-Inj...Information-31

http://www.gearhead-efi.com/Fuel-Inj...Information-OE

dave w

[lvdaytona]

Can you post the .bin from the '93 and the .bin from the '95 you are using? Broadcast code on the chips would save a bit of time if you have them.

I am using a 7427 ecu with prom BMHM for 95 setup, and old setup was 7060 ecu with BANF prom.

[In-Tech]

The early and late TB unit can basically use the same calibration, not perfect but close enough. The 7060 runs a 4L80e and your original bin file(BANF) was 7.4L 4L80e so, not sure why you went to the red/blue right off the bat. The egr can cause much grief if one is EVRV and other is solenoid(didn't check your files). I would turn off egr for now till you verify wiring which it sounds like is your issue somewhere. Bottom line is you can swap early and late TB units(as long as fuel pump keeps up) and not change the cal. Not that it doesn't need a cal improvement but stock will still get you down the road :)

[myburb]

If you are using a 95 bin and a 7427, without any fancy tuning you need the 94-95 injector and a fuel pump putting out at least 30+ psi. I have been involved with several of those swaps. With tuning you can run the older (93) injectors with 13 psi. What you want is to have a calculated fuel flow of about 70 flow. The 93 and 95 pods are interchangeable.

[lvdaytona]

The early and late TB unit can basically use the same calibration, not perfect but close enough. The 7060 runs a 4L80e and your original bin file(BANF) was 7.4L 4L80e so, not sure why you went to the red/blue right off the bat. The egr can cause much grief if one is EVRV and other is solenoid(didn't check your files). I would turn off egr for now till you verify wiring which it sounds like is your issue somewhere. Bottom line is you can swap early and late TB units(as long as fuel pump keeps up) and not change the cal. Not that it doesn't need a cal improvement but stock will still get you down the road :)

I swapped ecu because of the 4l80e. The trans was 95 and up, the 7060 ecu/prom would not control it correctly. something was different with the pressure control solenoid and how the ecu controlled it. I believe the 93 4l80e had a program that caused solenoid to perform a cleaning routine every few seconds or something...not sure, just know that it was not controlling it right, and trans would not shift correctly. The swap to the 4l80e was what started this whole nightmare! As far as egr goes, I did swap to the solenoid type and rewired the harness for that egr to work.

[lvdaytona]

by saying that "The 93 and 95 pods are interchangeable.", do you mean the injectors are the same physically, or do I need the pod piece from a 95 to put on the 93 tb?

[myburb]

The injectors are physically the same size.