OBD2 conversion revision B in progress.
Posted: Thu May 22, 2008 8:25 pm
Call me a gluton for punishment. Call me crazy...I don't care. over the last 6 months, more money than I care to admit was tied up in the 93 SSEi, and most of that money was due to the PCM conversion (HP Tuner, several PCMS, etc.). Money that I will never see again...so I might as well put it to good use.
It's a known fact that the 94/95 PCMs work great when they are good...but when they are bad, they are a major PITA. And very hard to come across a good one in the JY. When I did the 1993, that harness was made from scratch, and although it worked well enough, it was far from the plug-n-play setup I initially intended it to be. But the 94-95s are a different story.
Aside from running new wiring for MAP, AC pressure, and the EVAP flow switch (a total of 8 wires), and figuring out the cruise control (that was next on the project list), the conversion on the 94/95 models should be MUCH easier to do. Taking lessons learned from my first attempt, here is the outlay for "Revision Bravo" :
1) PCM will be located in the cabin, underneath the stereo.
2) Connectors from a 94/95 PCM will be scuttled from it, and they will be soldered onto the corresponding OBD2 PCM wires. The harness itself should be no more than 3.5 feet, to allow for service loop.
3) Non-shared wiring will be bundled up, and ran through a grommet hole to the engine bay. This includes the cruise control, AC, MAP sensor, and any others that might crop up.
This system, unlike the first one, will be geared for plug and play conversions, and should be completed in an afternoon. The system works, as I've already proven. Now, it's going to be controlling a stable platform (unmodded and well-cared for L27) instead of a Frankensteined engine. When i start on this project, it will take a matter of weeks, not months, to accomplish, since the research has already been done. From a performance standpoint, I realize I won't gain much...if any at all. This is more for replacing the funky OBD1.5 system and going with a standard OBD2 setup.
I'd like some input from you guys...if this kit *were* to be produceable, what would you like to see?
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Posted: Sun Apr 20, 2008 2:16 am Post subject:
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I was looking at the SSE yesterday after work (just did the AL7 conversion to it!!!), and there really isn't any room under the dash for the 1997 module...though I am betting the 1998-up modules could. Since budget is a prime factor, I gotta stick with the 1997 setup. And since I do NOT want to stick the PCM in the engine bay (as it would mean having to lose or relocate the airride pump and the headlight washer bottle), the next best place is in the trunk. The only issue I have in doing this, is the fact that the wire resistance is going to be greater, making response times slower.
Rivieras had their PCMs mounted underneath the seat, so maybe the distance between the PCM and the engine isn't too bad afterall in terms of operation efficiency.
_________________
Found something that might make the conversion easier to accomplish cheaply. I did a search on "gm 32 pin" (what is used for the three PCM connections), and this is what I came up with...
Granted there are some wires missing, but should be simple enough to put them in there. These connectors will allow me to construct a new PCM interface for the existing 94/95 PCM connections inside the cabin. And will be MUCH easier than trying to salvage the RWB connectors from a junk PCM.
_________________
It's a known fact that the 94/95 PCMs work great when they are good...but when they are bad, they are a major PITA. And very hard to come across a good one in the JY. When I did the 1993, that harness was made from scratch, and although it worked well enough, it was far from the plug-n-play setup I initially intended it to be. But the 94-95s are a different story.
Aside from running new wiring for MAP, AC pressure, and the EVAP flow switch (a total of 8 wires), and figuring out the cruise control (that was next on the project list), the conversion on the 94/95 models should be MUCH easier to do. Taking lessons learned from my first attempt, here is the outlay for "Revision Bravo" :
1) PCM will be located in the cabin, underneath the stereo.
2) Connectors from a 94/95 PCM will be scuttled from it, and they will be soldered onto the corresponding OBD2 PCM wires. The harness itself should be no more than 3.5 feet, to allow for service loop.
3) Non-shared wiring will be bundled up, and ran through a grommet hole to the engine bay. This includes the cruise control, AC, MAP sensor, and any others that might crop up.
This system, unlike the first one, will be geared for plug and play conversions, and should be completed in an afternoon. The system works, as I've already proven. Now, it's going to be controlling a stable platform (unmodded and well-cared for L27) instead of a Frankensteined engine. When i start on this project, it will take a matter of weeks, not months, to accomplish, since the research has already been done. From a performance standpoint, I realize I won't gain much...if any at all. This is more for replacing the funky OBD1.5 system and going with a standard OBD2 setup.
I'd like some input from you guys...if this kit *were* to be produceable, what would you like to see?
_________________
Posted: Sun Apr 20, 2008 2:16 am Post subject:
________________________________________
I was looking at the SSE yesterday after work (just did the AL7 conversion to it!!!), and there really isn't any room under the dash for the 1997 module...though I am betting the 1998-up modules could. Since budget is a prime factor, I gotta stick with the 1997 setup. And since I do NOT want to stick the PCM in the engine bay (as it would mean having to lose or relocate the airride pump and the headlight washer bottle), the next best place is in the trunk. The only issue I have in doing this, is the fact that the wire resistance is going to be greater, making response times slower.
Rivieras had their PCMs mounted underneath the seat, so maybe the distance between the PCM and the engine isn't too bad afterall in terms of operation efficiency.
_________________
Found something that might make the conversion easier to accomplish cheaply. I did a search on "gm 32 pin" (what is used for the three PCM connections), and this is what I came up with...
Granted there are some wires missing, but should be simple enough to put them in there. These connectors will allow me to construct a new PCM interface for the existing 94/95 PCM connections inside the cabin. And will be MUCH easier than trying to salvage the RWB connectors from a junk PCM.
_________________
