lostsoul Posted July 2, 2019 Report Share Posted July 2, 2019 Can someone confirm the Audi R8 Coil connector wiring ? Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 2, 2019 Report Share Posted July 2, 2019 Pin 4 is on the left, pin 1 on the right. Pin 4 is the main power ground so needs to be decent sized wire. Pin 2 is secondary ground so can be smaller. Ground both to cyl head. Pin 3 is the ign signal from ECU. Pin 1 is +12V, again needs to be decent wire. Dont give these too much dwell, they pull about 16A at 2.5ms, I usually stick around 1.8ms which is about 8A. Confused, rkde and krabstarr 3 Quote Link to comment Share on other sites More sharing options...
lostsoul Posted July 2, 2019 Author Report Share Posted July 2, 2019 Thank you. Quote Link to comment Share on other sites More sharing options...
928sg Posted September 26, 2019 Report Share Posted September 26, 2019 Adam, Can you add recommendations on the wire gauge? Quote Link to comment Share on other sites More sharing options...
Adamw Posted September 26, 2019 Report Share Posted September 26, 2019 5 hours ago, 928sg said: Adam, Can you add recommendations on the wire gauge? For the main power/ground I have used 18AWG tefzel, but as I said above Im only running them at 8A peak. If you are a high boost turbo you may want to go to 16AWG. If using Tefzel wire, 18AWG is good for about 9A, 16AWG about 12A. Low temp PVC insulated wire would need to be bigger. 928sg 1 Quote Link to comment Share on other sites More sharing options...
John Wolfe Posted October 27, 2020 Report Share Posted October 27, 2020 So if I'm putting R8 coils on a 05 Infiniti Q45 w/ VK45DE V8 I would still ground both grounds to the cylinder head and not to the ground wire on the stock coil connector? Quote Link to comment Share on other sites More sharing options...
Adamw Posted October 27, 2020 Report Share Posted October 27, 2020 I would expect the stock coil grounds would go to a main ground point on the engine somewhere which would be fine. If they dont then you would be better to run new grounds. Quote Link to comment Share on other sites More sharing options...
ellisd1984 Posted February 20, 2021 Report Share Posted February 20, 2021 I know this is dragging up a old thread but since i'm asking the same question I didn't see the point in starting a new one. These cable sizes, are these the main run for say 14v and ground or is 18wg recommended for the individual branches going to individual coils? I've bought a link "Loom A" 5m to make a new engine harness as i'm sick of my 25year old one causing me problems. I was going to use the red/white 8V wire as the power feed to the indiviual coils and crimp these to a larger feed wire about 6-8 inches away. I did a quick check on a wesite and it said it should be ok but now I'm doubting myself:https://www.dropbox.com/s/bp2qc00q2gihyx9/Screenshot 2021-02-20 at 06.57.20.png?dl=0 Quote Link to comment Share on other sites More sharing options...
Adamw Posted February 20, 2021 Report Share Posted February 20, 2021 0.5mm2 AVSS would be a bit borderline for powering those coils. Probably would get away with it but I usually err on the more cautious side with PVC insulated wire. As I mentioned above I would tend towards 18AWG or 0.75mm2 for the power supply on these coils. The main wire feeding them before it branches out doesnt need to be much bigger since only one coil at a time will be pulling peak current and duty cycle/average current is much less. Generally, besides voltage drop to consider, the main limiting factor in the current a wire can carry is the melting point of the insulation (copper doesnt melt until >1100°C, but some PVC melts @ ~80°C, so obviously the insulation is going to disappear long before the conductor has a problem). Unfortunately that web page you are using looks like it doesnt consider ambient temperature, self heating or insulation properties at all. The Link AVSS wire is rated for continious use at 80°C and intermittent use at 120°C, when you consider your coil wiring is sitting right on top of the cyl head, it is probably sitting at about 80°C already before you even add any current effects to it... Below is the permissible current spec from the Japanese standard that AVSS is designed to meet. Notice how quickly the current drops away with increasing ambient temp: Quote Link to comment Share on other sites More sharing options...
ellisd1984 Posted February 20, 2021 Report Share Posted February 20, 2021 Thanks Adam, I've bit the bullet and used the larger red 14v cable in the loom. Quote Link to comment Share on other sites More sharing options...
Shamanyak Posted November 19, 2021 Report Share Posted November 19, 2021 On 7/2/2019 at 12:08 PM, Adamw said: Pin 4 is on the left, pin 1 on the right. Pin 4 is the main power ground so needs to be decent sized wire. Pin 2 is secondary ground so can be smaller. Ground both to cyl head. Pin 3 is the ign signal from ECU. Pin 1 is +12V, again needs to be decent wire. Dont give these too much dwell, they pull about 16A at 2.5ms, I usually stick around 1.8ms which is about 8A. I want to connect bmw e30 m42 engine r8 coil, do you have a wiring diagram about it, can you help me? Quote Link to comment Share on other sites More sharing options...
Adamw Posted November 19, 2021 Report Share Posted November 19, 2021 Do you have a Link ECU? Quote Link to comment Share on other sites More sharing options...
ellisd1984 Posted April 21, 2022 Report Share Posted April 21, 2022 I'm sorry for dragging up an old thread but I'm actually at the point of wiring these in. The original wiring for the injectors and coil/igniter is fed from one 30A fuse. will this be sufficient to run both the r8coils & injectors? Quote Link to comment Share on other sites More sharing options...
Adamw Posted April 21, 2022 Report Share Posted April 21, 2022 Yeah that would be plenty, what ecu and engine do you have? Quote Link to comment Share on other sites More sharing options...
ellisd1984 Posted April 21, 2022 Report Share Posted April 21, 2022 It's a G4X Pnp on a 3sgte engine Quote Link to comment Share on other sites More sharing options...
Adamw Posted April 21, 2022 Report Share Posted April 21, 2022 Yep that will be fine. Quote Link to comment Share on other sites More sharing options...
bajo_01 Posted May 20, 2022 Report Share Posted May 20, 2022 Hi adamw,old thread ik,I see that you have knowlege about r8 coils,so do you have any experience with audi b5 platform,3 pin connector on factory ecu,want to go to r8 if possible without vems.. Quote Link to comment Share on other sites More sharing options...
Adamw Posted May 20, 2022 Report Share Posted May 20, 2022 The 3 pin coils are dumb coils. I dont know the platform well but I suspect these will likely have an ignitor somewhere to drive the dumb coils. To change to smart coils you would need to remove the ignitor and run wires direct from ecu to coils. However dwell times will likely also be wrong unless you can reprogram the stock ecu. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.