1997 Blck box to 0411 Swap

[Dan Smith]

What tune file would I start with ?

1997 5.7 4l60 regular cab shortbox 2wd

[Fast4.7]

What tune file would I start with ?

1997 5.7 4l60 regular cab shortbox 2wd

Modified 2002 Express van L31/4L60E file. The MAF calibration is far different between an 01-02 van and GMT400 even though they use the same MAF part number. For a 1997 GMT400, the later van tune also has a lot of stuff that will need to be disabled. VATS disabled, PRNDL set to none, Alternator F and L terminal diagnostics disabled, evap pressure sensor codes deleted, evap vent solenoid code deleted, and a few other things I am forgetting. If that L31 has the updated MPFI spider you need to put the correct injector data into the 0411 tune as well. 08-13 4.3Ls used the upgraded spider from the factory. I have a startup base tune I use in all of them. My startup tune is different 96-97 vs 98+ given the numerous changes GM made on the later ones.

[04silverado6.0]

I didnt realize the injector data was different. Lots of people using the upgraded spider without retuning. Can you post the difference? I dont think i ever changed the PNRDL switch either. Wiring straight from the switch on the trans to the 0411.

[Fast4.7]

Injector data is way different and the spiders even run at different pressures. One has poppets and the other real injectors so of course the data is way different. Stock poppets ran at 66 psi and the updated runs at 58 psi. There is 10% less flow on the newer unit at the rated pressure nevermind the rest of the important data being different. On the stock black box tuning at the time, my stock 97 Express running on E10 pump fuel was 2 full points leaner than commanded and had loads of KR at WOT using stock injector data with the GM AC Delco upgrade spider. Changed injector data and the commanded air/fuel and fueling dropped right into line with where it should have been and most of the KR went away. The rest went away when I dropped a 170F thermostat into it.

I have never wasted my time to wire in the PRNDL on swaps. The MPS does the same thing when the PRNDL is set to None.

I have a tune file I will post but it has a hot timing map for 91+ octane (I usually ran 93) and no hotter than a 170F thermostat. It would probably knock like a Jehovas witness on 87 at the stock operating temp, with the tiny factory cam that is 5* advanced, junk factory iron heads, crappy GM dished piston design and complete absence of quench those engines ran. I run more timing now in an 11:1 aluminum head 383 than the Vortec would tolerate before it spark knocked on 91+.

[04silverado6.0]

I could probably take the early e38 data and convert to gen 3 data.

[Fast4.7]

I could probably take the early e38 data and convert to gen 3 data.

That is what I did using E37 data for an 08+ Express 4.3L in the repository. Later 4.3L ran a returnless version of the same spider and same injector part number. Take the 58 psi row and plug in the data. I have run the later 4.3L timing maps as well capping the upper value at 42* IF it is not a 24x swap. I have tuned a couple L31 5.7L 24x setups now that were 24x swapped just because of the crappy distributor cap and rotor setup on the L31s.