L94 & 6L80 Into My '92 2dr K1500 Blazer

[farmtruc]

OK, I had thought it was hard to set that up. How do you go about setting it up for the PCM to control the post 2007 alternator?

ok , just going off of memory.
i believe the alternator was charging this way.

using flat old style alternator connector
x2 pin 61 goes to Pin B
x2 pin 32 goes to Pin C

i'm pretty sure i was using a 2010 ecm and harness

[Nak]

Thanks for that. Too late for me--mine's already modified--but that should help folks reading this.

I'm making minimal progress. First I had to work on the remodel, then I got called out of town, then I was home for a day and got called out of town again. Very frustrating, as a couple of full days should see this running. I've gotten some small things done. One O2 harness lengthened, the other shortened. All the vent lines are in place. Fuel tank wiring is done. Still to go: Mount and calibrate the fuel tank. Hook up the fans. Hook up the windshield washers. Install the O2 sensors. Mount the ECM. Install the intake manifold. Fill the coolant. Make a few changes on the tune. (Disable DOD until 1000 miles.) Run the Battery grounds and Alternator connections. AC connections. I think that's it...

[Nak]

Fuel tank & system is done. The 2012 plug for the fuel tank vapor pressure sensor had to be trimmed to fit the 1998 fuel sender/pump module. Should still be weatherproof. Hoping to start her up tomorrow evening!

I've been studying the tuning process and found a very good reason--performance--to keep the evap system operational. The ECM uses the Evap system to determine percentage of ethanol in the fuel. It then adjusts the tune for the fuel. Only a Flex Fuel engine will do this, but this is a pretty cool thing. Without the Evap operational, you'd have to tune the engine to take advantage of the high octane rating of E85. With the Evap operational, fill her up with E85 and instant extra horsepower! E85 = Cheap race gas. Also, in the near future we're likely to see different levels of Ethanol in our fuel. It'll be nice to have a correct tune regardless of the % ethanol.

[Nak]

Had a few problems. I was missing a couple of breakouts on the harness, not a big deal--easy enough to add. Then I realized my fuel sender was wrong. I switched to a '98 tank to get the 40-250 ohms fuel level sender. Here's the problem: '98 till about 2004 is 40 ohms empty and 250 ohms full. After 2004, 40 ohms is full and 250 ohms is empty. (I need the ECM to have the correct fuel level because of my plans for my instrument panel.) Anyways, after some research I figured out how to calibrate the ECM for a reverse fuel curve with HPTuners. After some tests it looks like it works fine. Hopefully I won't have any issues down the road with the fuel sender curve being reversed. (I want things like fuel mileage and distance to empty to work properly.)

So, I'll finish wiring the fuel sender tomorrow--maybe an hours work--then I'll fill the fuel tank one gallon at a time so I can calibrate the fuel level. After that I've got just a few small things to do; so barring any problems I'll start her in the next day or two.

[Nak]

Getting close. I filled and calibrated the fuel tank, installed the intake and a few other details. I pressurized the fuel system and no leaks! Yay!

Here are the calibration values for a 1998 fuel tank & sender with a L94 engine. Your numbers may be slightly different, but these should get you pretty darn close:
Empty, 14.2%
1 Gallon, 14.2%
2 Gal, 16.4%
3, 19.2%
4, 22%
5, 23.6%
6, 25.8%
7, 27.4%
8, 29%
9, 31%
10, 32.6%
11, 33.8%
12, 35%
13, 3.2%
14, 37.2%
15, 38.4%
16, 39.6%
17, 40.8%
18, 41.2%
19, 42.8%
20, 43.6%
21, 44.4%
22, 45.4%
23, 46.2%
24, 47%
25, 48.4%
26, 49.2%
27, 50.2%
27.5, 50.6%
28 - 30 gallons, 50.6%

[Nak]

Started her up tonight! Some problems though... First, I get a DTC "No comm with TCM" and the transmission won't go into gear. I'm thinking I'll have to have my TCM reflashed at a dealer. Second, I show nothing for oil pressure or temp. Not low or zero, nothing. I'm guessing there's a problem with the harness. Third, One of the trans cooler fittings I had welded up is leaking at the weld. That'll have to come off & get re-welded. Fourth, I have no tail lights at all. No brake lights, turn signals, etc in the rear. I'll have to trace that one down.

Other than that she ran rough for a while but is running fine now. The exhaust sounds excellent, at least at idle with minor revving. Very quiet. Hopefully the valves in the mufflers will open open--like they are supposed to--during hard runs.

I'll get a first run video up soon along with a few more pictures.

[Nak]

Already fixed everything but the tranny not going into gear. As far as that goes, It's either an OS compatibility between the TCM and the ECM--most likely I think--or a VIN incompatibility--Less likely I think. Possibly a tune issue, but I find that unlikely; but what the hell do I know! Either way, It's going to take a re-flash at the dealer to get the TCM and the ECM talking.