Custom Wiring Harness: Where To Start? [
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- Опубликовано: 25 июл 2024
- Where do you start a large, daunting wiring project? With planning of course, but what should that entail?
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In this 'Today at HPA' update we take a look at how the wiring requirements were broken down for the FJ40/BF42 V8 engine conversion project. This includes making sure you know the inputs and outputs you require in order to understand what ECU is best for you and your requirements. So, so SO many people ask us 'what is the best ECU' and this explanation helps to show that there is no such single, simple answer as what YOU need, what WE need here and what your neighbour who still hasn't returned your Oscilloscope after 4 weeks needs for entirely different projects and budgets.
Andre shows how he has listed everything out and also broken it down so he knows exactly what he needs, the drive by wire (dbw) throttle body system for example not being one item on the list, but 6 in order to cover the half bridges, position sensor and analog voltage inputs to make sure we know everything's position as well as the ability to position it.
Also discussed are connector and current sharing considerations where you need to check the pinouts and make sure that you are allowing for the correct size wire as well as not overloading your connector terminals where applicable.
We touch on the electric handbrake and wiper motor in relation to bench testing, noting the handbrake sourced from an Audi wasn't as straight forward an option as we could have gone with, but it was also nice to deal with something a little different.
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TIME STAMPS:
0:00 - Introduction to members Webinar '306 | Basic Wiring Fault Finding'
0:56 - Racetech Competition is now CLOSED. Congrats To The Winner!
2:16 - FJ40 Project Update - 3UZ Swapped BJ42
3:15 - Complete Rewire Underway
4:48 - Wiring Planning: What Do You NEED?
5:40 - Outputs And Inputs | ECU Selection
6:50 - Initial Planning Checklist
7:10 - DBW Throttle Wiring Plan Explanation
7:50 - Engine Speed and Position + VVTi
8:55 - Other General Sensors
9:15 - Power Steering and A/C
9:21 - Pass Through Wiring
9:50 - Totals For ECU Selection Considerations
10:37 - ECU Pinouts & Current Sharing
11:25 - Autosport Connector Reference
13:09 - Wiring Sizing | Limited By Contacts
14:00 - Power Distribution Module Bench Testing
15:00 - Audi Electric Handbrake Setup
18:41 - Almost Went In 'To Hard Basket'
19:01 - Wiper Motor Setup and Test
20:50 - PDM Installation and Configuration Course
23:37 - Tuned In Podcast: Dahtone Racing | GTR & RB Wizardry
25:25 - Do You Like Free Stuff?
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WEBINAR INFO: This [UPDATE] came right before members only webinar '306 | Basic Wiring Fault Finding' which can be found via Gold Membership on the HPA website.
Wiring faults are the most common issue we see when we have a car on the dyno. Fortunately most of the normal faults we come across are relatively common and easy to diagnose. In this webinar we’ll look at some basic diagnostic techniques that you can perform with simple tools.
Want to watch members-only High Performance Academy lessons on topics like the one mentioned at the start of this [UPDATE]? Sign up via the website, link above with coupon code.
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⚠️ Want to learn more about motorsport wiring? Claim your spot to the next FREE lesson: hpcdmy.co/wiringlessonyt
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#highperformanceacademy #learntotune #enginebuilding101 #dontletthesmokeout #wiring101 #dieseltuning #datanerd #gofasterwithdata #racecraft #learndriveoptimise #motorsports 
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Looking forward to the FJ cruiser content! Perfect timing as I’m doing a similar electrical overhaul with a Nexus r5 on my rx7
what a massive video. making devices communicate with each other that was never intended to do so and finding logical and efficient hacks to achieve the overall goal. just wow.
Where there is a will there is a way! Then there is hindsight which helps you figure out if you do it all the same way again next time or differently 😅 That is what keeps things like this interesting, there's always a different way and something new to learn, big and small - Taz.
@11:40 you have all of the injectors there EXCEPT #5, I didnt see it listed anywhere else but I mightve overlooked it
EDIT: overall great video! very informative
I’ve been building looms for a couple years now, from MIL spec to club level. I want to buy a project car to do something for myself, will ofcourse be going full auto sport and raychem spec. ECUmaster everything (because I work for them and products are amazing). Loving the tuning course too. Wiring is not as scary as it seems, I hope people get into it more! Someone recommend a good project car that I can show off my skills on. Was possibly thinking E36, any ideas?
Altezza/IS300/IS200
Great car. Great base for whatever discipline tou desire. Hell of alot of wiring.
12V VR6
@@j.m.5995 something more challenging and variable
E36 with a 1uz. Totally underrated engine. Probably placing one in my ‘74 Duster .
@@docfischer7291 now this I could think about. It the 1uz quad VVT?
Oh can the regular cabin controls be connected to a pdm? e.g. steering sticks, aircon sliders, aircon venting, defogger, etc etc?
Maybe I missed it, but how come you didn't use a half bridge output from the ECU for the handbrake? Purely the current requirements?
I gathered that they used up all the outputs already.
A couple of reasons here. First (and most important) I couldn't so this with production firmware in the M1 ECU. It could absolutely do it but would need some functionality coded in Build to provide suitable logic. Even if it had this functionality though the current draw on the handbrake exceeds what a single H Bridge can support given its wired via a #22 contact in the Autosport header plug. Generally a 22 AWG conductor will support around 6 amps whereas the handbrake draws closer to 20 - Andre
@@hpa101 Ok, thanks Andre!
Invest in some proper pin extractors. Plastic extractor do break so get extras and just take ur time with all them
Yes, it is good to have spares noting that they are plastic as they are designed to break rather damage your more expensive terminals and/or connector. They also come included with the connector so once you are rolling with things you naturally end up with a bit of a collection of them anyway in our experience when it comes to Autosport style connectors - Taz.
would 22 gauge tefzel wire be sufficient for 02 sensors
18-20 awg is generally used. O2/wideband sensors draw a bit more current compared to other typical sensors as they have a heating element in them for startup, which helps prolong their lifespan greatly - Taz.
@@hpa101 thank you I appreciate the info
Could you not just put a diode inline for your wiper motor low speed output to prevent backfeeding to the PDM? Seems like a lot simpler than anything else.
I can't think of a reason why that wouldn't work, except that its totally possible the wiper motor will generate a voltage large enough to damage the diode as well. Big diodes capable of passing the low speed current in the forward direction (they have a 0.7V drop across them, and passing ~3A of current, so 2.1W of power dissipated across them as heat), but also not failing when blocking the continuous reverse generated voltage when the high speed winding is being used are also at a guess pretty expensive? Ultimately it's a moot point though since every PDM I've dealt with has a dedicated output for wiper control so it's just a matter of understanding this and using the correct channel - Andre
@@hpa101 thanks Andre!
@@hpa101 if one were to not have dedicated wiper outputs on their PDM, could you use two relays, one to interrupt DC negative for on/off) and a SPDT to select hi-low speed? So if high is selected (relay off let's say) the low side leg is "open" and vise versa if in low speed (relay on)?
Not a huge fan of uz series engines in fj40s. They are a good series of engine, but they take so much engine bay space. Also isn't the starter in the valley? Fj40 owners sometimes take they're fj40 pretty far from civilization. So ease of repairability and accessibility to components is a a concern. Not that I would totally not consider a uz series engine for those reasons, but something that would make me think twice.
How can a someone get or pay for a course?
Do you mean for someone else? You can get in touch directly and buy a voucher: support@hpacademy.com
Or just purchase the course/package deal with their email address: www.hpacademy.com/hpa-wiring-starter-package/
Hope that helps! Please email if you need any more assistance as RUclips doesn't allow us to see comment replies easily so we do miss them sometimes - Taz.