I have an Electromotive SDI/OptiEliminator for sale. The coil base and mounting bracket have been polished and clearcoated. With this setup you can completely eliminate the OptiSpark. Everything needed for the install is included, including LT1 specific instructions and hardware, with the exception of spark plug wires (uses standard HEI style connectors). Three Hall pickups are included as well.

Works with 92-95 OBDI LT1's. Recommend using the SDI to control timing so functions such as soft-touch rev-limiter, programable timing curve, etc can be used. Timing can be controlled from inside the car (±7°). Can also be used with a two-bar MAP for boosted applications. Separate tach output. Very flexible setup without having to go to a completely stand-alone computer system.

Asking $500, and will consider reasonable offers.

Pictures can be seen HERE. Some of the pictures show the gold irridite finish before the unit was polished. Does not include the billet Opti cover.

 

Hi,
I noticed that this system has a gear that bolts onto the crank pulley, is there any way to mount the sensor so you can put the gear behind the pulley as I want to put it on a vette? Also i see that SDI systems have 1 coil per 2 cylinders and LTCC have 1 coil per cylinder and are $400 plus about a $100 in coils. How negotiable are you on the price? Thanks,
Dan

 

That's the crank trigger, and there's a bracket that bolts to the waterpump to hold the pickup over the crank trigger. The pickup sits about .025" - .035" away from the crank trigger and it provides the SDI with a timing "baseline". There are two teeth missing from the crank trigger that tells the SDI where TDC is.

Electromotive sells many different crank triggers that may allow you to use it behind the crank pulley - you will have to contact them and ask. The current setup places the crank trigger about 1.750" away from the crank pulley.

The SDI is a "lost spark" setup. Very little spark energy is wasted to the cylinder that isn't under compression. If you compare the coils on the SDI (which are standard GM coilpacks like is used on the Northstar) you'll notice that they are much larger than the LS1 coil packs. More mass, larger windings and larger wire gauge equate to a coil that is more durable and has the potential for more spark energy, even when taking into account the slight loss to the "dead" cylinder. I'm not saying the LS1 coil setup is bad by any means, it's a huge improvement over the stock setup.

This is a quite a different system than the LTCC. The LTCC uses the optical side of the Optispark, this system can run with or without the Opti. The LTCC cannot run by itself; it requires input from the PCM. The SDI can run under control of the PCM, but actually works better in stand-alone. You can control the timing curve using three dials under the cover on the SDI itself. Additional timing control can be added by connecting it to a MAP, and will work with 2 and 3 bar MAP sensors for boosted applications. Additionally, it can be set up to use the PCM for normal timing control under normal conditions and switch to the SDI timing curve by flipping a switch, using a WOT switch or activated with a nitrous system.

The LTCC is a very nice plug-n-play setup - the SDI takes some work to get it going, including finding #1 cylinder TDC on the compression stroke (so the crank trigger can be placed in the correct position). The SDI is a nice system for those who want more control in their ignition system without having to go to a complete aftermarket system.

The coils are included with the system, but I can't offer support (you will have to contact Electromotive for support) and is being sold as-is. I make no guarantees as to the feasibility of the system for any particular application.

If you want to make an offer, send me a PM or an e-mail.