94-95 LBody Tuning Guide BETA 11-16-09

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GM 94-95 L Body Tuning Guide 11/16/09 - Revision 1.07 ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯ GM 60 Degree Tuning Guide For 1994-1995 L Body Information describing how to add the ability to tune your 1994-1995 L Body by swapping to the OBDI 16149396 PCM with electronic transmission controls for the 4T60-E. By Isaac Hayes Table of Contents ã Introduction to adding the ability to tune your 1994-1995 L Body x – – – ã Parts Required x Putting it
  GM 94-95 L Body Tuning Guide 11/16/09 - Revision 1.07 ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯   GM 60 Degree Tuning GuideFor 1994-1995 L Body Information describing how to add the ability to tune your 1994-1995 L Body by swapping to the OBDI16149396 PCM with electronic transmission controls for the 4T60-E. By Isaac Hayes  pg. 1 Table of Contents ã Introduction to adding the ability to tune your 1994-1995 L Body x – Parts Required x – Putting it Together – Wiring Diagram x ã Tuning How-To – Introduction x – Setup & Required Equipment x – Getting Started with TunerPro RT – Suggested Values and Formulas – Other Adjustments x – Tuning VE Fueling – Tuning Spark Advance x ã Notes – Idle Re-learn x – Adding Features x ã Credits – Robert Saar for wiring diagram*** Re-import pictures if pixilated.*** X = Section done to satisfactory amount for now.  pg. 2 Figure 1   Figure 2Introduction  The 1994-1995 L bodies and other GM cars with the 3100 (except for A-body) got stuck with a PCM that was a crossover gray year. Most refer to this as “OBD1.5”. The stock PCM is somewhat more advanced than older PCMs, is flashbased, and still technically OBDI. To this day there is no tuning solution for it, and not much technical data from GM.Some people opt to swap to OBDII, but that requires more sensors, wiring harness changes and other items as well asexpensive tuner hardware. This guide is going to show you how to swap to an OBDI PCM which is fully tunable andcan control the electronically shifted 4T60-E.The PCM service code that we will be swapping to is 16149396 and is in 91-93 W-body cars with the 3.4L DOHC“Twin Dual Cam” engines. It was used for the 3.1L MPFI motor as well for the 93-94 years only. It has additionalSRAM to control the transmission. This PCM can also accept many other “bins” of code for those who have swapped a5spd or even have a turbo. See the tuning section for more info. However this guide will focus on installing the PCMand getting it up and running for a car still equipped with the factory 4T60-E automatic. It will also touch on how to tuneand what is needed.Keep in mind by going to a “real” OBDI PCM, you will loose SFI. The motor will run with MPFI. The stock SFI computerreverts to MPFI or “batch fire” after so many RPMs anyway. This means you will no longer need the 24x crank sensorbehind the harmonic dampener or the cam sensor. You can leave them still attached to the motor though, in case youwant to swap back to your srcinal PCM for whatever reason. We will be making an adapter harness so swappingbetween the two PCMs is as simple as disconnecting them from the body harness. Nothing on the vehicle will need tobe modified. Also this may cause problems if your area has emissions testing with going backwards to an older PCM.Although it technically will still be OBD1, and still have the EVAP and EGR working like stock. If you have an engineswap or modified engine, tuning can actually improve your emissions. Parts Required 1). 16149396 PCM from 91-93 W bodies 3.4L DOHC or 93-94 3.1L MPFI. (See Figure 1)  2). Four PCM Connectors from the body wiring harness which plugs into thePCM, with 6” or more of length. (See Figure 2) Note: These connectors can also be had from other weather proof PCMs ofthe same style case.3). Spare 3100 PCM (or your srcinal one if you don’t plan to ever use itagain). (See Figure 3.a)  We will take this apart and remove the three electrical connectors only. Youcould also order these connectors brand new through Mouser Electronics. (See Figure 3.b)   [ Mouser Part Numbers: 12186043 - 12186041 - 12129008 ]   Figure 3.aFigure 3.b  pg. 3 Putting it Together Now once we have the parts, we will take the 4 connectors from the 16149396 PCM, solder the wires from them to theconnectors we removed from the 3100 PCM going to the correct pins for the conversion (see next page for pinouts).This will allow the harness we have made to plug into the 16149396 PCM, and the other end into the body harness ofthe car.You will need to know how to solder, and use heat shrink to cover the connections. I would also use some electricaltape as well, and possibly wire loom to organize the new harness. You will want to seal the 3100 PCM connectorssince the pins on the back will be exposed where you soldered the wires. Liquid electrical tape or potting compoundwill work. Do not use silicone as it contains acid and will corrode the connections. Epoxy could be used if one wished.Depending on where you mount the PCM will determine how long the harness you will make. You could fabricatebrackets to mount it in the stock location. Another option is to make the harness very long and have the PCM mount onthe hump behind the heater controls on the floor with some Velcro or metal L-brackets for grip. You may need to solderon extra wire to extend the length between the two connectors.Removing the 3100 female connectors from the donor PCMIf you do not buy new connectors for the interfacing to the body harness, you will need to take them out of a 94-953100 PCM or PCM from a 3.4L RWD F-body. First open the PCM case. If the torx screws are rusted tight, take a hack-saw and cut the thin part of the case through where the screws mount and it will quickly come apart. Then take the torxscrews and bolts out of the PCB’s and remove them from the case. Now you can remove the injector driver MOSFETsand other items in your way to get at the connectors. The easiest way to remove the connectors is to take a Dremelwith a thin cut-off wheel and slowly cut through both rows of pins flush to the board. You could also de-solder it fromthe board if you can do that kind of work without over heating the connectors. To clean the dust off, take a nylon brush(toothbrush) and soap and water to get the metal dust out of the clear sticky rubber potting compound that is on theinside of the connectors. You don’t want this holding the metal dust and possibly making connections between pins.That would cause trouble shooting nightmares. Then shake the water off or blow the water out with air and set aside.Wiring it togetherSolder the wires from the body harness pigtail 16149396 PCM connectors to the female 3100 PCM connectors. Useshrink wrap to cover the connections.(see Figure)Use the table on the next page to match up the wires to the correctpins. See Figure 1 for the 16149396 connector letters (in picture, prom cover is facing up). For the 3100 PCMconnectors, A =White/Gray, B =Black, C =Blue. Looking inside the connectors you will see where the numbering startsand ends.(9396 numbers, check those to see if they show up, else show close up)Pin-out table notesIf going to a manual swap later, see the manual/auto pins which serve dual purpose. Be sure to either enable thecorrect flags in the .bin to turn off auto support and enable manual support, or better yet start with a 5spd bin.1 st gear and 4 th gear switch inputs are not connected because the newer 4T60-E does not have these outputs. Thisprobably is not needed for function of the PCM/trans as it appears to only be a secondary monitoring of the trans. Itcould be hooked up with the gear select position switch and two PNP transistors to “decode the logic circuit”.More infolater if this is needed.But the info is here in case we need it or want to use it for some reason.Power Steering signal is not hooked up or needed. This was for the older pumps to raise the idle when there is extraload from the pump.See the Adding Features section for adding in the rest of the un-used connections.  
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