SS #670 Modifications:
Shiftlight

[Shiftlight] Here is the shiftlight I installed in SS #670; I used one of Harlan's shiftlights. The tach on the F-Body is a bit lazy; it's possible to hit the rev limiter (6200 RPM) with the tach reading 5700 RPM or lower. This has something to do with the fact that the tach is driven by serial data from the PCM to the instrument cluster. This combined with the fact that the engine is still pulling strong at redline makes it difficult to tell when it's time to shift.

I mounted the shiftlight in the HVAC vent above the stereo. The five LEDs (mine are yellow) are very bright and difficult to ignore day or night. I originally programmed the shiftlight for 5900 RPM. However, I found that I would still occasionally brush the rev limiter so I later reset it for 5800 RPM.

I attached the shiftlight to a small piece of sheet metal using a 1" adel clamp (a metal loop clamp with a rubber cushion) I found at the local hardware store for $0.50. I used two sheet metal screws to mount it in the inside of the air duct. After a few tries I was able to position the light so it was aimed correctly.

[Exposed view] [PIC assembly]
Exposed view PIC assembly

Here's a picture the circuit board which consists of a Peripheral Interface Controller (PIC), some dips switches and buttons used to program it and some miscellaneous support components.

Electrical hookup

Disconnect the negative terminal of the battery while working on electrical circuits to avoid potentially damaging shorts and possible personal injury.

I wired the hot side of the shiftlight to the +12 volt "GAUGES" circuit on the fuse block (fuse 9). I got ground from a convenient sheet metal screw under the dash.

[SS #670 wiring schematic] [Fuse panel]
SS #670 wiring schematic Fuse usage chart

Here is a schematic that includes the shiftlight wiring in PDF format.

On a 2000 Camaro, the tach wire (circuit 121/Engine Speed Output) goes from the PCM to a connector C105. I think taping the tach wire here is easier (and safer) than messing with the PCM connector. C105 is an eight pin weatherpack connector and is the middle of three connectors located on top of the passenger side wheel well.

connector C105

Since I don't have ASR, the dark green wire enters on "G" but does not exit from the matching connector. A quick way of taping in without cutting wires is to disassemble the connector and carefully remove the tach wire. Then solder the new wire to the connector and reassemble.

Programming

When looking at the board with the push buttons on the top and the dip switch on the bottom (see above), the left button is #1 (cylinder) and the right is #2 (RPM). The dip switches are numbered 1-7.

Note: It is not necessary for the engine to be running during programming.

To read the current number of cylinders programmed, apply power and then press and release button #1. The number of flashes indicates the programmed number of cylinders (or one if using coil per plug mode).

To program the number of cylinders, set the dip switches as shown in the chart, apply power and press and hold button #1 until the light begins to flash rapidly. Release the button and count the number of flashes to check for correct programming.

# cyls 1 2 3 4 5 6 7
2 ON OFF OFF OFF OFF OFF OFF
4 OFF ON OFF OFF OFF OFF OFF
6 OFF OFF ON OFF OFF OFF OFF
8 OFF OFF OFF ON OFF OFF OFF
CPP OFF OFF OFF OFF ON OFF OFF

The LS1 uses 4 cylinder mode.

To read the current trigger RPM, apply power and then press and release button #2. The number of flashes indicates the programmed RPM in hundreds. Two numbers are displayed. Zero is represented by two fast flashes. For example, two fast flashes followed by eight flashes would be 800 RPM. Five flashes followed by eight flashes would be 5800 RPM.

To program the trigger RPM, set the dip switches as shown in the chart, apply power and press and hold button #2 until the light begins to flash rapidly. Release the button and count the number of flashes to verify programming.

RPM123 4567
500ON OFFONOFF OFFOFFOFF
600OFF ONONOFF OFFOFFOFF
700ON ONONOFF OFFOFFOFF
800OFF OFFOFFON OFFOFFOFF
900ON OFFOFFON OFFOFFOFF
1000OFF ONOFFON OFFOFFOFF
1100ON ONOFFON OFFOFFOFF
1200OFF OFFONON OFFOFFOFF
1300ON OFFONON OFFOFFOFF
1400OFF ONONON OFFOFFOFF
1500ON ONONON OFFOFFOFF
1600OFF OFFOFFOFF ONOFFOFF
1700ON OFFOFFOFF ONOFFOFF
1800OFF ONOFFOFF ONOFFOFF
1900ON ONOFFOFF ONOFFOFF
2000OFF OFFONOFF ONOFFOFF
2100ON OFFONOFF ONOFFOFF
2200OFF ONONOFF ONOFFOFF
2300ON ONONOFF ONOFFOFF
2400OFF OFFOFFON ONOFFOFF
2500ON OFFOFFON ONOFFOFF
2600OFF ONOFFON ONOFFOFF
2700ON ONOFFON ONOFFOFF
2800OFF OFFONON ONOFFOFF
2900ON OFFONON ONOFFOFF
3000OFF ONONON ONOFFOFF
3100ON ONONON ONOFFOFF
3200OFF OFFOFFOFF OFFONOFF
3300ON OFFOFFOFF OFFONOFF
3400OFF ONOFFOFF OFFONOFF
3500ON ONOFFOFF OFFONOFF
3600OFF OFFONOFF OFFONOFF
3700ON OFFONOFF OFFONOFF
3800OFF ONONOFF OFFONOFF
3900ON ONONOFF OFFONOFF
4000OFF OFFOFFON OFFONOFF
4100ON OFFOFFON OFFONOFF
4200OFF ONOFFON OFFONOFF
4300ON ONOFFON OFFONOFF
4400OFF OFFONON OFFONOFF
4500ON OFFONON OFFONOFF
4600OFF ONONON OFFONOFF
4700ON ONONON OFFONOFF
4800OFF OFFOFFOFF ONONOFF
4900ON OFFOFFOFF ONONOFF
5000OFF ONOFFOFF ONONOFF
5100ON ONOFFOFF ONONOFF
5200OFF OFFONOFF ONONOFF
5300ON OFFONOFF ONONOFF
5400OFF ONONOFF ONONOFF
5500ON ONONOFF ONONOFF
5600OFF OFFOFFON ONONOFF
5700ON OFFOFFON ONONOFF
5800OFF ONOFFON ONONOFF
5900ON ONOFFON ONONOFF
6000OFF OFFONON ONONOFF
6100ON OFFONON ONONOFF
6200OFF ONONON ONONOFF
RPM123 4567
6300ON ONONON ONONOFF
6400OFF OFFOFFOFF OFFOFFON
6500ON OFFOFFOFF OFFOFFON
6600OFF ONOFFOFF OFFOFFON
6700ON ONOFFOFF OFFOFFON
6800OFF OFFONOFF OFFOFFON
6900ON OFFONOFF OFFOFFON
7000OFF ONONOFF OFFOFFON
7100ON ONONOFF OFFOFFON
7200OFF OFFOFFON OFFOFFON
7300ON OFFOFFON OFFOFFON
7400OFF ONOFFON OFFOFFON
7500ON ONOFFON OFFOFFON
7600OFF OFFONON OFFOFFON
7700ON OFFONON OFFOFFON
7800OFF ONONON OFFOFFON
7900ON ONONON OFFOFFON
8000OFF OFFOFFOFF ONOFFON
8100ON OFFOFFOFF ONOFFON
8200OFF ONOFFOFF ONOFFON
8300ON ONOFFOFF ONOFFON
8400OFF OFFONOFF ONOFFON
8500ON OFFONOFF ONOFFON
8600OFF ONONOFF ONOFFON
8700ON ONONOFF ONOFFON
8800OFF OFFOFFON ONOFFON
8900ON OFFOFFON ONOFFON
9000OFF ONOFFON ONOFFON
9100ON ONOFFON ONOFFON
9200OFF OFFONON ONOFFON
9300ON OFFONON ONOFFON
9400OFF ONONON ONOFFON
9500ON ONONON ONOFFON
9600OFF OFFOFFOFF OFFONON
9700ON OFFOFFOFF OFFONON
9800OFF ONOFFOFF OFFONON
9900ON ONOFFOFF OFFONON
10000OFF OFFONOFF OFFONON
10100ON OFFONOFF OFFONON
10200OFF ONONOFF OFFONON
10300ON ONONOFF OFFONON
10400OFF OFFOFFON OFFONON
10500ON OFFOFFON OFFONON
10600OFF ONOFFON OFFONON
10700ON ONOFFON OFFONON
10800OFF OFFONON OFFONON
10900ON OFFONON OFFONON
11000OFF ONONON OFFONON
11100ON ONONON OFFONON
11200OFF OFFOFFOFF ONONON
11300ON OFFOFFOFF ONONON
11400OFF ONOFFOFF ONONON
11500ON ONOFFOFF ONONON
11600OFF OFFONOFF ONONON
11700ON OFFONOFF ONONON
11800OFF ONONOFF ONONON
11900ON ONONOFF ONONON
12000OFF OFFOFFON ONONON

The above chart is not necessary when you notice that the RPM X 100 is encoded in binary; dip switch #1 corresponds to 1, #2 to 2, #3 to 4, #4 to 8, #5 to 16, #6 to 32 and #7 to 64. For example, 5800 RPM is 58 X 100. Since 58 is 2 + 8 + 16 + 32, switches #2, #4, #5 and #6 will be on.


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Craig Leres