I’m doing a 1974 Mazda REPU Carburetor to TBI Conversion and would like to have opinions/suggestions on my wiring. I used Aaroncakes schematic to make thing easier to see what I’ve changed.

1. Using 4 coils
2. Two EGT Probes
3. TPS is stock GM TBI
4. Idle is stock GM TBI 4 wire using IAC 1A, 1B, 2A, & 2B (not shown)

Changed the battery connection because my fuse panel only has one B+ connection for all of the fuses.

 

I guess what I'm really asking is, will anything as it is shown burn my REPU down to it's axles. LOL

 

the shield of the cam sensor needs to go to the shield of the crank and the - of the cam sensor need to go to the- of the crank, also i would eliminated the sound system 12v from the ecu wiring.

 

Thank you. I'll do that tonight.

 

Your TBI injectors are probably low impedance, correct? If so, then use the main board injector drivers which can handle low impedance through PWM instead of resistors.

And I also agree with removing the audio system from the fuse panel. The EFI panel should be for engine related items only. Set up another panel for the body, and another for audio/accessories.

 

Thanks for your help guys. The fuse box I'm using has 12 spot so the sound system was more a space filler than anything else, with that said I'didn't know not to do that so it was good info.

The fuel injectors are low imp. I all ready have them setup on injA and B with resistors for now so if that doesn't work out I will change them to PWM.
Thanks again guy glad to know I'm not going to go up in smoke.

 

get the new style ev14 injectors, idle quality its way better.

 

stock GM TBI throttle bodies use there own type of injectors. Standard injectors don't fit

 

I did go from 50ish#(350ci) injectors to 80#(454ci)

 

Here is a link to the thread I started on this conversion.

https://www.rx7club.com/old-school-o...rsion-1081256/