International 345 TBI EFI conversion

[JeepsAndGuns]

Yeah, me too?

BMHK $OE it's the only manual bin I ever found, is there another one? Think it was your thread that confirmed what I was taught about bins a long time ago from auto to manual having lots of changes not normally seen in simple xdf or software like TunerCat. Guys who can dissemble can find subtle differences but the new XDF v250 stuff has found so many parameters and TunerPro compare function confirmed many differences in IAC logic to begin with.

I tried a $0D auto bin once. I copied over my fuel and spark tables, cyl volume and injector flows, and a handfull of other parameters. I tried it and hated it. IAC logic SUCKED. I only drove it about a mile before I turned around and came back home and removed and deleted that bin...lol

[EagleMark]

Well I found another reason to run $OE because it has direct connection to PCM from VSS and no DRAC/VSSB buffer. But now what VSS to buy?

Four choices from Jags That run for aftermarket in speedo line VSS. Can rule out number 4, I think 1 and 2 are for DRAC/VSSB? That leaves 3?

There are 4 types of VSS signals required by the ECM:

1. The two-pulse (2000 pulses per mile) square wave (D.C current or direct current) used on all TBI engines thru 1992, all computer-controlled-carbureted engines, and on 1985-1989 TPI engines.

2. A four-pulse (4000 pulses per mile) sine-wave (A.C. current or alternating current) signal isr equired by the 1990-1993 TPI, 1992-1993 LT1 engines, and 1990-1993 Camaro 3.1/3.4 V6 engines.

3. A 40 pulse per driveshaft revolution speed sensor used on 1993 and newer trucks with automatic -transmission, 1994 and newer rear drive cars with the automatic transmission.

4. A 17 tooth per driveshaft revolution speed sensor used on 1993-1997 LT1 engines with the Borg-Warner 6-speed transmission. An 11 tooth reluctor ring is used on 1993 LT1 engines with the Borg-Warner wide ratio (3.35 First gear) 6-speed transmission.

[gregs78cam]

The way I understand it, the 40pp driveshaft sensor is used as a input for the VSSB, and then the VSSB outputs a 2000ppm, and 4000ppm signal to the PCM. I think the 2000ppm and 4000ppm sensors can be fed directly into the PCM.

[JeepsAndGuns]

We touched on this back in my 7427 thread. I have the #1 from JTR. All I had to do was set the parameter (I think it was a flag?) in the bin that says input not from DRAC. Speed reads and reads corectly.
It did not work untill I set it for input not from drac.

[FSJ Guy]

We touched on this back in my 7427 thread. I have the #1 from JTR. All I had to do was set the parameter (I think it was a flag?) in the bin that says input not from DRAC. Speed reads and reads corectly.
It did not work untill I set it for input not from drac.

That's what I did, too. I have the 2PRS (something like that), also. I also marked the same flag so the PCM knows what type of input to expect. Instant success. :D

I found it interesting that GM even put that option in the code. But, of course, I'm not complaining.

[EagleMark]

Awhile back when I did this harness I noticed the 4l80E wiring diagram went from VSS to PCM. But the 4L60E went to a DRAC/VSSB buffer so at that time I only had an $OE manual bin and wired that way.

[EagleMark]

Well it has taken longer then expected but my kid wanted to do the entire project himself. With school and a full time job he got er done!

I was just a teacher and the project is running. Now just have to cover harness in convoluted tubing and proceed to tuning. Which is another thing he wants to learn so TunerPro and ADX and XDF and his starter $OE manual bin are loaded on his laptop.