ZR-1 Net Registry Forums - View Single Post - Building an LT5 engine harness from scratch. Any advice?

shanker · 02-06-2011

This project has been moving forward, but mostly in the chassis & body department. I haven't touched the engine wiring yet except for purchasing all the necessary connector pigtails & getting wiring diagrams. I was originally looking for pinouts on each of the LT5's sensors, but I have that info now. Part of the reason I chose the Autronic Engine management is because I've seen it control the LT5 engine and it can use almost all of the stock sensor inputs. Crank & cam position sensors are usable with my autronic unit as far as I know.
I'm using an AEM brand CDI 4 channel ignition to fire my factory coil packs. I haven't heard anything bad about the "wasted spark" setup. I planned to use an external regulator & set fuel pressure at a constant.

todesengel: Using only 8 injectors sounds like a great idea! I'll PM you about which ones you're using, and what you use in place of the secondaries to fill the holes. I don't really need meth injection but I do need something in place of those injectors. Maybe just leave them in place without wiring them? I was told by a GM ZR1 engineer that I could run the FP at 55psi and I'd be happy with the results. the stock injectors are 22.8lbs/hr @45psi

I was planning to run all 16 injectors, and have the secondaries kick in at anything above 1% throttle. I was told this would give a good idle and performance. Basically I would wire primary & secondary injectors together, but use a relay for the power output to the secondaries. Both injectors for each cylinder would fire in unison above 1% throttle.

I am no expert and I have no real experience with the LT5 engine so if anyone has advice for me I will certainly appreciate it.

02-06-2011	#19
shanker Join Date: Feb 2008 Location: Albany NY Posts: 15	Re: Building an LT5 engine harness from scratch. Any advice? This project has been moving forward, but mostly in the chassis & body department. I haven't touched the engine wiring yet except for purchasing all the necessary connector pigtails & getting wiring diagrams. I was originally looking for pinouts on each of the LT5's sensors, but I have that info now. Part of the reason I chose the Autronic Engine management is because I've seen it control the LT5 engine and it can use almost all of the stock sensor inputs. Crank & cam position sensors are usable with my autronic unit as far as I know. I'm using an AEM brand CDI 4 channel ignition to fire my factory coil packs. I haven't heard anything bad about the "wasted spark" setup. I planned to use an external regulator & set fuel pressure at a constant. todesengel: Using only 8 injectors sounds like a great idea! I'll PM you about which ones you're using, and what you use in place of the secondaries to fill the holes. I don't really need meth injection but I do need something in place of those injectors. Maybe just leave them in place without wiring them? I was told by a GM ZR1 engineer that I could run the FP at 55psi and I'd be happy with the results. the stock injectors are 22.8lbs/hr @45psi I was planning to run all 16 injectors, and have the secondaries kick in at anything above 1% throttle. I was told this would give a good idle and performance. Basically I would wire primary & secondary injectors together, but use a relay for the power output to the secondaries. Both injectors for each cylinder would fire in unison above 1% throttle. I am no expert and I have no real experience with the LT5 engine so if anyone has advice for me I will certainly appreciate it.