Looking for tune file for LT1 1996 conversion to LS PCM

**dave w** · 11-05-2023

I wonder about '0411 injector parameters LT1 vs. L31?

**In-Tech** · 11-05-2023

1997 LT1 Camaro MAF Transfer funcion

Code:

    MAF Sensor Calibration Table
 
  Hz    gm/sec
   1488   2.45 
   1616   2.88 
   1744   3.34 
   1872   3.87 
   2000   4.45 
   2128   5.12 
   2256   5.85 
   2384   6.64 
   2512   7.49 
   2640   8.41 
   2768   9.40 
   2896  10.46 
   3024  11.60 
   3152  12.82 
   3280  14.11 
   3408  15.48 
   3536  16.98 
   3664  18.60 
   3792  20.34 
   3920  22.22 
   4048  24.23 
   4176  26.35 
   4304  28.60 
   4432  30.97 
   4560  33.43 
   4688  35.99 
   4816  38.69 
   4944  41.54 
   5072  44.52 
   5200  47.66 
   5328  50.97 
   5456  54.42 
   5584  58.04 
   5712  61.81 
   5840  65.77 
   5968  69.92 
   6096  74.27 
   6224  78.82 
   6352  83.59 
   6480  88.58 
   6608  93.80 
   6736  99.25 
   6864 104.93 
   6992 110.88 
   7120 117.04 
   7248 123.42 
   7376 130.03 
   7504 136.87 
   7632 143.92 
   7760 151.14 
   7888 158.63 
   8016 166.31 
   8144 174.03 
   8272 182.36 
   8400 191.01 
   8528 200.07 
   8656 209.43 
   8784 219.12 
   8912 229.15 
   9040 239.52 
   9168 250.23 
   9296 261.30 
   9424 272.71 
   9552 284.48 
   9680 296.61 
   9808 309.10 
   9936 321.96 
  10064 335.20 
  10192 348.80 
  10320 362.77 
  10448 377.14 
  10576 391.88 
  10704 407.02 
  10832 422.55 
  10960 438.46 
  11088 454.78 
  11216 471.51

**drptop70ss** · 11-05-2023

Originally Posted by In-Tech

1997 LT1 Camaro MAF Transfer funcion

Code:

    MAF Sensor Calibration Table
 
  Hz    gm/sec
   1488   2.45 
   1616   2.88 
   1744   3.34 
   1872   3.87 
   2000   4.45 
   2128   5.12 
   2256   5.85 
   2384   6.64 
   2512   7.49 
   2640   8.41 
   2768   9.40 
   2896  10.46 
   3024  11.60 
   3152  12.82 
   3280  14.11 
   3408  15.48 
   3536  16.98 
   3664  18.60 
   3792  20.34 
   3920  22.22 
   4048  24.23 
   4176  26.35 
   4304  28.60 
   4432  30.97 
   4560  33.43 
   4688  35.99 
   4816  38.69 
   4944  41.54 
   5072  44.52 
   5200  47.66 
   5328  50.97 
   5456  54.42 
   5584  58.04 
   5712  61.81 
   5840  65.77 
   5968  69.92 
   6096  74.27 
   6224  78.82 
   6352  83.59 
   6480  88.58 
   6608  93.80 
   6736  99.25 
   6864 104.93 
   6992 110.88 
   7120 117.04 
   7248 123.42 
   7376 130.03 
   7504 136.87 
   7632 143.92 
   7760 151.14 
   7888 158.63 
   8016 166.31 
   8144 174.03 
   8272 182.36 
   8400 191.01 
   8528 200.07 
   8656 209.43 
   8784 219.12 
   8912 229.15 
   9040 239.52 
   9168 250.23 
   9296 261.30 
   9424 272.71 
   9552 284.48 
   9680 296.61 
   9808 309.10 
   9936 321.96 
  10064 335.20 
  10192 348.80 
  10320 362.77 
  10448 377.14 
  10576 391.88 
  10704 407.02 
  10832 422.55 
  10960 438.46 
  11088 454.78 
  11216 471.51

Thank you again!

**In-Tech** · 11-05-2023

Hiya,
You're welcome.
Those early MAF's aren't so good, especially with a non stock inlet air tract. Just trying to get you a decent starting point for your tuning process.

**steveo** · 11-05-2023

corvette and f body maf calibrations are quite different even though they use the same sensors. this is likely due to plumbing differences and also different afr goals in the upper ranges and gm using it for fine tuning there rather than targeting perfect calibration

**Fast355** · 11-08-2023

The Express uses the same MAF as the F/Y car LT1 or early LS1. Should be able to copy the LT1 injector data into the 0411 tune. The Van tune will need some timing added to it. From there tune the VE tables with the MAF failed. Once you get the VE tables dialed in, re-enable the MAF and start tuning the MAF curve. The LT1 should pop right off on the van tune and run fairly well. But it will definitely be down on power without some timing added to it, van tune only has like 24° total advance.

Personally I would use a DBC P59 and use the Mexican GMT800 L31/5spd tune as a starting point. Segment swap over the 6spd trans segment from a 2005 CTSV that also had a P59 with the same OS.

**dave w** · 11-08-2023

Originally Posted by Fast355

The Express uses the same MAF as the F/Y car LT1 or early LS1. Should be able to copy the LT1 injector data into the 0411 tune. The Van tune will need some timing added to it. From there tune the VE tables with the MAF failed. Once you get the VE tables dialed in, re-enable the MAF and start tuning the MAF curve. The LT1 should pop right off on the van tune and run fairly well. But it will definitely be down on power without some timing added to it, van tune only has like 24° total advance.

Personally I would use a DBC P59 and use the Mexican GMT800 L31/5spd tune as a starting point. Segment swap over the 6spd trans segment from a 2005 CTSV that also had a P59 with the same OS.

Is there a link to the DBC P59 Mexican GMT800 L31/5spd tune? Is there a possibly of posting the DBC P59 Mexican GMT800 L31/5spd tune to this thread?

**drptop70ss** · 11-06-2023

Originally Posted by In-Tech

Hiya,
You're welcome.
Those early MAF's aren't so good, especially with a non stock inlet air tract. Just trying to get you a decent starting point for your tuning process.

Appreciate it, will definitely have a non stock air intake, will be a 96 LT1 T56 put into a 61 Rambler wagon going on an 87 monte carlo SS chassis. One of my usual mutt builds!

**In-Tech** · 11-06-2023

Hiya,
Since you are building a new intake tract, use the 01-06 Truck MAF, it is much more forgiving to intake tube changes(Initial tune I posted is set up for that). Make sure it has at least 12" of straight tube after the MAF, and a high quality air filter before the MAF that will reduce any turbulence before the MAF. These things will drastically help you in the tuning process.

**Fast355** · 11-08-2023

Originally Posted by In-Tech

Hiya,
Since you are building a new intake tract, use the 01-06 Truck MAF, it is much more forgiving to intake tube changes(Initial tune I posted is set up for that). Make sure it has at least 12" of straight tube after the MAF, and a high quality air filter before the MAF that will reduce any turbulence before the MAF. These things will drastically help you in the tuning process.

I have not experienced that at all. Any intake change even with that MAF has had to be adjusted for.

I also just put a GenIV truck or G8 MAF on a setup. It works very well.

**drptop70ss** · 11-05-2023

Originally Posted by dave w

I wonder about '0411 injector parameters LT1 vs. L31?

The LT1 ran 24 pound injectors stock, I have never looked at an LS PCM tune running at vortec (yet, still have to get this one loaded onto a PCM), if the tables are set up the same I will adjust if needed.

**1project2many** · 11-08-2023

I wonder about '0411 injector parameters LT1 vs. L31?

Agreed. I would definitely expect to use injector tables that math the type of injector that is installed. The L31 Poppet style injectors are very different from traditional fuel injectors.

IME the stock one ton van injector voltage compensation is incorrect below 10V. If left stock our commercial vans have difficulty starting with a low battery and the exhaust is very rich at idle if the voltage drops. Leaving those tables intact could really mess with traditional injectors.