Anyone have a 4L80E program?

Hey folks, I think I found the problem! I updated the Force Motor Current fields D3802 and D3803 with the one from a Camaro with a 4L80E from the HoldenCrazy modified files, and it fixed 90 percent of the problems. Unfortunately I won't be able to continue tuning the trans right now, as tomorrow I start putting a new engine in the truck. The shift speeds are off, as are the kickdown speeds, as I am still having an issue with vacuum leaks screwing with things. Well, I won't be by the end of the week, but up till now... Anyway, included is a copy of the new file I'm using at the moment, if anyone else is having similar problems and wants to give it a shot. I still plan to put the finished file over to holdencrazy.com when I get it worked out. I've gotten tons of help here, the least I can do is give a little back. Please note, this file does not have a stock 4L80E gearing, I'm using the 2.75 first and 1.58 second gears in this trans. If you have a stock 4L80E I'd not use this program.

Attachment 10379

Telco, set D0960-D0962 Throttle Kickdown tables to 100% all cells; this will avoid conflicts with the PT Upshift/Downshift tables.

K, once I get the truck back on the road (engine swap in progress) and get the segment copy issue worked out I'll make sure to adjust per your suggestion. Thanks.

Hey question guys. I was just correlating the old program to the new so I can get the shift points more or less correct, and just discovered on the old program that field H0104 was incorrect. According to the program,

"The number of revolutions per mile of the transmission output shaft.

For manual vehicles, it is not used and is often set incorrectly.
For automatic vehicles, it is used by the PCM to determine the transmission shift speeds.

It will normally be consistent with the equation: H0101=H0102*H0104."

On the old program, H0101 is 88956, calculated according to the tire diameter, which is correct. H0102 is 40, which is a set number. Since H0101=H0102*H0104, it also means H0101/H0102=H0104. H0104 should be 2223.9, but the program shows 2790. Might this have been causing my strange shifting parameters? When I put the tire diameter in for the new program from scratch, the numbers calculated the correct values for all three fields.

That may have been the cause of the shift points being out.

Sweet. I'm really looking forward to seeing how the new program goes with the new engine.

Quote:

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Originally Posted by ScarabEpic22

Just found your file from earlier in this thread, I see your truck is a 2000. Why not use an OS from 2002 like the popular 12212156? It should be more refined than the 2000 OS plus if you ever want to go to a COS its easy. Not sure you want to add another thing into the mix right now though!

Attached is a stock 02 12212156 OS file with a freshly copied 4L80E trans and trans diagnostic segment. I also put your VIN in, but didnt change any of the tables around. If it works for ya, great! The IFR is different between your tune and this one so I knew there would be a few things to move around. If you want to use it, open your old file and this new one and copy all the values from the 2000 tune to the 02 one.:rockon:

(BTW, are there any advantages to running say an OS from 03 vs 02 in a 512kb PCM? I know most people use the 12212156 OS because its great for Vortec swaps with the Express van tune, but what about regular trucks?)

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Scarab - I tried using your program but my computer would not accept it. Guess it's not going to work. Thanks though.

I did get the engine running, finally. There's still a lot to be done yet though. Initially I had misfiring on two cylinders, found them to be a couple of defective injectors so I've got six 5.3L injectors and two 4.8L injectors in the truck right now. It doesn't seem to be affecting anything badly since the engine is a 4.8L, but I'll be swapping all the injectors with new ones as soon as I get enough scratch together. Still have to track down an oil leak, and get the wideband wired in.

Hello Telco,

Take a look at the part number on the original 4.8 L injectors, and the 5.3 L injectors you have intermixed - these maybe the same. GM generally used the same injectors on 4.8 / 5.3 / 6.0 L engines within the same model year, and often over several model years.


Regards,
Taz

My dad mentioned that to me last night. I plan to check it out this evening. Thanks.

Telco, did you full flash the file I created for you? If you did not, then its not going to work because the trans segment is for an 80E not a 60E.