600 hp-1gfe build- Concerns about my wire size choices

Good day, I have a quick question and would really appreciate some feedback. I’m currently constructing a wire harness for a 600hp Toyota 1G-FE and have some concerns about my wiring choices. I’m using all Tefzel / M22759/32 wire throughout the harness. For the coil power supply (Bosch R8 coils, part number 0221604800), I’m running 14 AWG from the relay through the second layer of the harness as the main power feed. Layer also includes: Another 14 AWG for the starter solenoid, 22 AWG twisted pair for CAN communication, 18 AWG for injector power supply, three 22 AWG Tefzel shielded wires (TSB-2C) for the cam and 2 WB knock sensors and the core is a single 2 core shielded for crank sensor. Back to the coil power question: I’m feeding power with a 14 AWG wire into two 16 AWG wires that run through a Deutsch DT connector, which then split into three 18 AWG wires each — powering six coils in total. My concern is whether this configuration is sufficient to handle the current draw for the coils under load and starter solenoid when cranking.

I would be quite comfortable with your configuration in a sequential application.

14AWG has a current rating of approx 18A at 100c (Hopefully won't be seeing that temp, however I like to look at the hotter current limits), and having a very quick search your coils draw approx 6A under normal conditions, up to around 16A at max dwell. There should only be one coil firing at a time, meaning you should be well within the constant current limits of the wires you've got. Your DT plug will be close to it's limit, having a 12A rating.

If running a semi-sequential/wasted spark configuration, then you should be fine under normal loads, but might be reaching some limits at full load given you're powering 2 coils at any given time. The question then will be, how much time will be spent at high load - street car with the occasional pull, a dyno queen, or at the dragstrip, I'd be comfortable. For frequent track day use, time attack, etc, I'd probably beef it up a bit..

Thank you for the response. I will be running them sequentially and the 14awg will split in 2 16awg before the dt connector which each pin is rated at 12amps. Highly unlikely I will running them over 10amps @2.5 ms duty cycle.