Ok, all I need to know is, is it possible to run the LT1 harness and computer on a Gen 1 SBC and use a regular distributor.... or would you HAVE to use a DFI system or something. Dont say it wont work with heads and intake as this will be a very custom setup.

Thanks,

Joel

 

Yea it will work,use the opti to control the injector firing and the dist to do the timing and not connected to the computer.Ya will have to get the balancer keyed and get a aftermarket one with timing marks to set your timing.

 

I don't think LR read the post right. The stock LT1 computer won't run with out the Opti, and you can't run an Opti on a gen I motor. If your running a Gen I motor in a 4th gen and want fuel injection, go DFI.

 

This is what I was thinking

 

The LT-1 WILL run without the spark side of the opti and a dist for spark.If ya run a FAST on an LT-1 ya got to have the opti for the injectors or a crank trigger or a dist with two modules.

If ya can't don't tell these guys or my shop car, that are doing it,that it can't be done.

 

The trick with the traditional SBC will be to figure out how to drive the opti.

 

If ya are going to an early model there are several companies that have the injector drivers in a box ready to plug in,with the harness,and everything.

 

You still didn't read the OP. He wants to run a Gen I SBC, not an LT1.

 

Read post above your's

 

Do they allow you to plug into a traditional flying magnet type trigger or what all is involved in that?

 

I still think you're reading it wrong. He's not saying the LT1 PCM will not run without the high voltage side of the Opti. He's saying you need the optical signals for the LT1 PCM to function (or a sim chip like the one Electromotive sold briefly with the SDI/Opti-Eliminator package). People have also managed to do that by installing the optical sensor module in a conventional distributor.

 

Fred,
There is one down here that has a conventional looking dist,and EFI.
It has two moduals in it one for spark and one for the EFI. Says he bought it from MSD built like that.From there ya need the injector control box and harness and you're set. This is in a '94 and the stock computer is retained for tranny and guages,ect.It's running in the low 11's and I have not looked at the car in the daytime yet,but I'm gonna.

 

If he's running the fuel injection with an aftermarket ECU, off the MSD dstributor signal, its no problem. MSD also makes a "stub" mount cam position sensor for their "coil per cylinder" setup. Looks just like a drive shaft for a distributor, and plugs into the distributor hole. I always thought all it would take is one of the "smart" guys here to come up with a "chip" to translate the MSD CPC stub data to the Opti low res pulse pattern.

I run the MoTeC ECU in full sequential, using the Opti optical signals, and the stock PCM is used to turn on the fuel pump, control IAC and the speedo. I still have the Opti and most of the other sensors paralleled to both computers.

The guys at NEDyno briefly touted a cam position sensor they welded into a stock LT1 timing cover, using the FAST/eDIST setup, but I don't think it ever worked too well. With a single point cam position sensor, you losing the high resolution level data that the Opti can provide. With a setup like the MoTec, where you can tune injector pulse timing, and tweek individual cylinders for fuel and ignition advance, the high res data from the Opti serves a very useful purpose.

 

Speartech was looking at selling an opti/HEI hybrid for use on LT1s and gen1s with LT1 engine management. Project is on the back burner at this time but maybe some polite interest expressed to him could move it along. It was basically an HEI with the optical sensors for the opti.