question about LTX-8S
 

it's mapped for an FD and i know that in some cases that these need to be sent back to Microtech to be re-mapped. could the current maps be changed enough to run N/A? i don't understand these ECUs that well but i just don't get why the user can't erase current maps and install another one for a different application. is it the intention of the manufacturer that u HAVE to send back to them when u change applications?

You can change the map as much as you want to adjust for any engine's fuel requirements. The real issue is that the FD uses different triggers then the 2nd gen. The 2nd gen uses two reluctors in the CAS, and I believe the FD uses Hall sensors. So the ECU will likely have to go back to Microtech to make that change.

yep, you can run a microtech on any second gen(n/a or turbo) but switching between FD and FC is a more complex issue, one that is internal in the ECU so it would need to be modified by Microtech to be able to switch between FC and FD.

so i can pretty much make the necessary changes to my engine, like 3rd gen ignition system etc., to get it to work on my '74 sp 13b. how would it react being used for fuel only?

I'm not sure you can easily add the 3rd gen triggering system to an older 13B. I don't do FDs (I'm not willing to accept that much pain :) ) so I don't know for sure.

Have you looked at the Megasquirt? It's easy as hell to set up as a fuel only controller.

yes i have but i don't have the patience to put one together and not cheap for preassembled ones. not to mention all the problems i read about that those using it r having. i really haven't decided on anything specific, it's just that when i run across something already mapped for a rotary, i'm curious as to if it's possible to remap it myself to work for my setup.

I put FC CAS w/ '83 RX7 Front Cover and FC coils w/ custom brackets on my '73 RX3 and it runs succesfully. I am pleased with the results so far. It's true, I am only on initial start-up, but it started. There are issues, but the CAS and coils are not it.

I need to know what the base timing mark for a 13B Cosmo Twin Turbo motor is in degrees so I can decifer where 5° ATDC is. After this I may get bold enough to put my turbo on again.

I do understand your lack of faith with the non-mechanical ignition systems. I ran a turbo with a carborator and mechanical advance distributor on my bridgeport for a bit and it was predictable and hence comfortable mostly due to lots of NA experience with the motor.

Racing Beat used to make a hall effect conversion for early front covers.