1996 LT1 to 12200411 PCM conversion help

[Snipescastle2]

Okay,Just wanted to bring everyone up to speed on what I have been doing to my ‘96 Trans Am LT1 0411 PCM conversion I’ve been Collaborating with Carl (“Intech”) to get my project working. Just so everyone knows, I have “TunerPro RT” For tuning, and I have my bench tuning harness/LSDroid and the OBDLink MX+ that I have been using thus far.
I am using an “OTC Genesis” Scan tool to read whats going on with my car(I don't have an ALDL cable for my laptop, so I’m using what I have.

I’m attaching my Bin file for everyone to review, and suggest any changes that you feel will help me get this beast dialed in. The engine is stock (for right now) I am getting ready to drop a 383 LT1 Stroker in it. The new engine has right at 11.5 to 1 compression, the LT4 “Hot Cam” and ported stock heads with1.6 Ratio rockers. Comp valve-springs/retainers/push rods.Scat cast steel crank, Scat pro comp rods and all ARP
hardware. I have deleted all the emissions, rear O2’s, evap etc.....I have updated the MAF to the newer “Truck Maf” and conversion table. I will post my last set of readings taken ( before I found an injector stuck open) that has since been fixed.
The car Idles kinda rough, but still idles. It has a little off idle stumble, and probably needs more advance. One code I got after I got it running was from the cam position sensor fault ( there isn’t a cam sensor on my engine) I’ll have to turn that off in the tune. Basically, this engine is running like a 2001 Vortec L31 350 without a distributor. Batch fire fuel injection -vs. Sequential fire. Same ignition coil/module same firing order, only using the opti spark distributor as a cap and rotor.
no opti electronics being used. It is using the crankshaft position sensor and reluctor to fire the engine.

Here’s my readings that were taken most recently:


RPM’s. 2443
IAT. 75F
Spark. 35deg
IAC position 209cnt
Baro press. 17.65 inhg
CMP retard. -28deg.
Desired IAC airflow
18 g/s
Desired idle speed 825 rpms
ECT- 109F
Engine load 82%
Fuel Trim cell 21
Fuel trim learn disabled
H02S bank 1sensor 1v
456Mv
HO2S bank 1sensor 2v
447Mv
HO2S bank 2sensor 2v
443Mv
HO2S bank 2sensor 1v
464Mv
Ign. 1 signalv 13.5v
Knock retard 0 deg
Ltft bank 1 0.0%
Ltft bank2 0.0%
Loop status open
MAF sensor 25.51 g/s
Map sensor 7.38 inhg
Map sensor Volts .77v
Stft bank 1 0.0%
Stft bank 2 0.0%
TP sensor volts. .22v
MAF Sensor hertz 3236.8 hz

My .Bin file :

Please feel free to suggest what I need to make this beast run better.
Probably more like the stock LT1 spark and fuel tables.
Thanks!
Ben Smith

[dave w]

Thank you for the progress update, especially the psted .bin file. What would be helpful for me and several other members interested your LT1 / 0411 project would be to post the original .bin file you started with. Several members, including myself, have the "expensive" software to compare the original .bin vs. the 0411_LT1 .bin. Just looking at modified .bin file is not very helpful, but comparing the .bin files shows what parameters were changed and MOST IMPORTANTLY how much of a change!

dave w

[In-Tech]

Hello everyone,
Here is the starting .bin and .cal(TC) we began with. I was thinking it would be great to make this a group project so the next guy would have an even better starting point. Unfortunately my time is very limited to help :( I will try to have an updated .bin file tonight for Ben(Snipescastle2) to try after dinner. Them snipes are good eatin

[Snipescastle2]

Carl,
Most of the “Snipes” I’m referring to, are “Hole Snipes” as in NAVY engineering folks��
I appreciate all the help thus far! The hard part is behind me, now to dial this puppy in!!!
Have a great evening!
Ben Smith

[In-Tech]

Here it is with the cam sensor fault corrected, sorry about that. We gotta see what this thing is doing when you get a chance to do some logging.

[dave w]

Attached are compare differences:
Source File: 0411 LT1 OS12208322 Files\01ExpressVan3500_L31_4l80E.cal
Compare File: 0411 LT1 OS12208322 Files\0411_Lt1_OS12208322_B.bin

dave w

[Snipescastle2]

Hello everyone! I’m still trying to wrap my head around this project,
it feels more like I’m getting “Wrapped around the axle” I’m reading more
about spark tables and advancing/retarding the timing according to
map-vs.rpm’s-vs.temp, etc. I found an online calculator that helps you
start initial spark tables, perhaps one of you guy’s can look this over and
see if it comes close. It’s from a site that uses “microSquirt” efi.
It ask’s specifics like:

http://www.useasydocs.com/theory/spktable.htm

Cylinder Bore:	inches millimeters
Combustion Chamber Type:	open chamber - little or no quench 2-valve closed chamber w/ optimized quench 3 or 4 valve engines, w/ swirl&tumble
Fuel:	regular (87 octane) mid-grade (91 or 92 octane) premium (94+ octane) E85
Compression Ratio:	< 9.0:1 9.1:1 to 10.0:1 10.1:1 to 11.5:1 > 11.6:1
Idle Vacuum:	in·Hg
Maximum boost level: (0 for naturally aspirated, max. boost (psi) for turbo/supercharged)	psi (21 psi maximum)
Maximum RPM:	RPM
Idle RPM:	RPM
Spark advance table dimensions:	8×8 12×12 16×16 24×24 MS-I uses 8×8 tables; MS-II, MicroSquirt, and the Sequencer use 12×12 tables.

if anyone has a different calculator or spreadsheets that can help us “Noobies” Please share,
I really want to understand the flow of how everything works together.
thanks again!
have a great day!
Ben Smith