Engineer & Designer: Bob Bailey Manual: Andy Bogus Version 1.
First Things, First This manual is written for the experienced shade tree, or professional, mechanic. If you are not capable, and these instructions, for whatever reason, scare the hell out of you, please, consider taking this to a competent professional for installation. It is highly recommended that you save these instructions. This manual contains valuable information that will permit you to trouble shoot and inform any future owner what you did – and why.
The OptiSpark Story A Brief History In 1991, General Motors Chevrolet Division introduced the 1992 Corvette with the Second Generation Small Block, designated by RPO code LT1. The LT1 was used exclusively in the Corvette until the 1993 model year, when it branched out into the new forth generation Camaro and Firebird, commonly referred to as F-Body cars, and in 1994, the GM B-Body, full sized rear drive sedans (the Chevrolet Impala SS and Caprice, Buick Roadmaster and Cadillac Fleetwood).
The Engineering The OptiSpark itself is not a bad component; it is simply the result of poor planning and execution. The OptiSpark is essentially a conventional distributor, however, it is much more compact and does not have the facility for setting base timing. As accurate as it may be, its condition can deteriorate rapidly, depending on climate and maintenance. The OptiSpark is made up of two halves, the “Opti” half, which consists of a metal disc with inner and outer rows of timing marks.
Additional Components Required To correctly install the LTCC, you will need the following parts: Quantity 8 2 1 1 1 1 1 1 1 Product GM LS1 Coils GM LS1 Coil Brackets Set, Taylor Spiro Pro Universal Wires Set, Taylor LT1 180 degree Ends Set, Taylor LT1 Angled Ends Taylor Wire Removal Tool Taylor Wire Crimper Assortment of fuses, 20-amps on up Taylor Convolute Tube, 25ft of ¼” Part Number 12558948 12562864 Color dependant 46052 46066 43392 43390 38092 (black) Internet Price $35.00 each $8.00 each $80.
THE LTCC KIT Please take a few minutes and familiarize yourself with these instructions and the kit itself. Inside the LTCC package, you will find the LTCC module and the harness. The harness has 8 leads, each with a weather pack connector and a ground wire, a pigtail connector and four non-harnessed wires.
Installation Procedures There are several ways you can go about installing this kit. We recommend taking a couple of stabs at it. Don’t do any one thing that will get you in over your head, especially if you need the car during this process. The following is a recommended installation procedure: 1. Install the coil packs. On the Corvette or F-Body cars, the coils can easily be mounted to the valve covers with home made stand-offs. It is easy enough to do both sides in one evening.
Special Instructions for 1992 Corvette Installation As noted above, the 1992 Corvette is a special case. The connector is not compatible with the later style connector used on the LTCC. To remedy this, there are two options, acquiring the harness ends that will allow you to change them over, or, carefully soldering the LTCC harness ends to the existing 1992 OptiSpark connector. Either way, you will need to be aware of how the OE 1992 connector looks. Please see the graphic below, for the pin out.
There is a 4 Position “Mode” Dip Switch inside the unit that has the following functions; Mode 1 Off Soft-Touch Rev Limiter 2 Energize 2-step Input to Activate 3 Rising edge 4 NOS Retard Activated by 2-step Input On Hard Cut Off Rev Limiter De-Energize 2-step Input to Activate Falling edge Low Rev Limit activated by 2-step Input Comments Default Determines 4x LowResolution Decode Mode Leave off
Tuning There are two dials inside the unit • • LIM is the rev limiter RET is the N.O.S. Retard & Low Rev Limit The settings are as follows: Setting 0 1 2 3 4 5 6 7 8 9 A B C D E F Result Disabled 6100 6200 6300 6400 6500 6600 6700 6800 6900 7000 7100 7200 7300 7400 7500 Setting Retard – above 2000 RPM 0 1 2 3 4 5 6 7 8 9 A B C D E F None 2 4 6 8 10 12 14 16 .5º per 1000 rpm .75º per 1000 rpm 1.5º per 1000 rpm 2º per 1000 rpm 2.
LED Error Codes Green is good, if on, the system is functioning correctly! Red is not so good. During the first second of operation, it will light, as part of the power on self-test, however, if it starts blinking, there is a problem. Please refer to the table below for details on what the blinks mean. 1 2 3 4 Cylinder Decode Sequence Error.
