Hi guys, trying to lose the opti on a stock 1996 LT1 and found that I can repin the harness to use the LS PCM. I downloaded a 2002 express van file from here with the 5.7, is that close enough to use on the LT1 as is? I will have to do a segment swap as I will be running a T56. If this file is not what I need does anyone have a start up and run file for the 96-97 F body LT1 using the 411 PCM? I can use either a bin file or HPT.
Thanks!
https://www.youtube.com/watch?v=nk3pvxJtYyU
I’m wondering if the video is the same as your conversion?
Similar but different, while he removed his opti completely the easierOriginally Posted by dave w
way is to use the opti for the cap and rotor and lose the opti sensor. The 4x
wheel and crank sensor is then used to fire the coil and injectors using the LS PCM.
common file to use to start is an early 5.7 express van file but I don’t know what
mods it needs for the LT1.
2002 L31 .bin files available on gearhead-efi: http://www.gearhead-efi.com/Fuel-Inj...rPro-Bin-Files
One of the challenges I see with the 96 LT1 vs. 2002 Express Van '0411 L31 are the spark tables. The 96 LT1 uses MAP Sensor tables for spark advance and the 2002 Express Van '0411 L31 uses MAF Sensor tables for spark advance.
The 2002 Express Van L31 Injectors are Sequential Fire.
Seems likely the LT1 would benefit using the 2002 Express Van '0411 MAF Sensor?
Seems likely the LT1 would benefit using the 2002 Express Van '0411 Ignition Module?
Seems likely the 2002 Express Van .bin file would require a VATS delete and possibly some Emission deletes also.
Correct, when this conversion is done it runs in batch fire mode. I can turn off VATS and any unneeded codes. As far as the MAF I can swap if needed, but I have to see if that is needed or not, same with the ICM. The 2001 express van tune has also been used, not sure if that is different than the 2002.
No guarantees on this file but it will start and run. Then you can begin the tuning process. The posted file uses a regular 5 wire 2000-2006 Truck MAF
Here is the Express transfer function for the stock 3 wire Express MAF.
Code:MAF Sensor Air Flow Vs. Output Frequency Hz gm/sec 1500 2.422 1625 2.805 1750 3.227 1875 3.695 2000 4.211 2125 4.789 2250 5.430 2375 6.133 2500 6.891 2625 7.703 2750 8.570 2875 9.484 3000 10.461 3125 11.516 3250 12.672 3375 13.945 3500 15.305 3625 16.742 3750 18.250 3875 19.836 4000 21.539 4125 23.359 4250 25.289 4375 27.352 4500 29.539 4625 31.875 4750 34.344 4875 36.938 5000 39.648 5125 42.398 5250 45.219 5375 48.133 5500 51.141 5625 54.273 5750 57.594 5875 61.102 6000 64.781 6125 68.641 6250 72.695 6375 76.953 6500 81.406 6625 86.055 6750 90.883 6875 95.906 7000 101.109 7125 106.500 7250 112.055 7375 117.805 7500 123.734 7625 129.844 7750 136.164 7875 142.672 8000 149.313 8125 156.188 8250 163.273 8375 170.570 8500 178.094 8625 185.859 8750 193.922 8875 202.250 9000 210.844 9125 219.719 9250 228.875 9375 238.320 9500 248.063 9625 258.102 9750 268.453 9875 279.102 10000 290.070 10125 301.352 10250 312.945 10375 324.867 10500 337.102 10625 349.672 10750 362.563 10875 375.781 11000 389.320 11125 403.188 11250 417.383 11375 431.906 11500 446.742 11625 461.906 11750 477.383 11875 493.180 12000 509.297
Last edited by In-Tech; 11-05-2023 at 04:17 AM.
-Carl
Same MAF sensor, same ICM on the vans as the LT1. LT1 is also sequential. Not hard toduplicate the LT1 timing curve if you know what the gm/cyl value is throughout the RPM range at WOT as well as what the MAP sensor reads at WOT. Then you can rinse and repeat for any rpm and load. Spark map in my aluminum head 383 L31 would probably be very close for an aluminum head LT1. I can post that tune.
Posting Permissions
Reply With Quote
Bookmarks