ThatBoostedE36 Posted March 15, 2020 Report Share Posted March 15, 2020 Hello, I have wired in new audi r8 coils and cant get a coils to fire, is my link ecu able to directly drive these coils? I'm using the bmw link g4 pnp and audi r8 coils(ngk u5014) Quote Link to comment Share on other sites More sharing options...
Simon Posted March 16, 2020 Report Share Posted March 16, 2020 The BMW has built in igniters in the ECU, the stock coils do not have an igniter built in. The Audi R8 coils have an inbuilt igniter. To make these work you would need to wire in external pullup resistors and change the spark edge in the ECU. Quote Link to comment Share on other sites More sharing options...
ThatBoostedE36 Posted March 16, 2020 Author Report Share Posted March 16, 2020 Thank you Simon for the reply, The diagram on ecu manual is what I need to follow then? Its says to use 470 ohm resistors but does the watts matter? Ignition x I'm sure its means each individual ignition out from ecu. The little box with the word igniter is each coil i would assume. The last thing is will I be able to use the 5v on the expansion loom for all 6 channels and other sensors being connected to it without stressing it out? I'm sorry for the newbie questions. Quote Link to comment Share on other sites More sharing options...
Adamw Posted March 16, 2020 Report Share Posted March 16, 2020 1 hour ago, ThatBoostedE36 said: Its says to use 470 ohm resistors but does the watts matter? 1/4W resistor will be fine. 1 hour ago, ThatBoostedE36 said: Ignition x I'm sure its means each individual ignition out from ecu. The little box with the word igniter is each coil i would assume. Correct & Correct. 1 hour ago, ThatBoostedE36 said: The last thing is will I be able to use the 5v on the expansion loom for all 6 channels and other sensors being connected to it without stressing it out? I'm sorry for the newbie questions. Yep that will be fine. Also make sure you change the spark edge to rising. Quote Link to comment Share on other sites More sharing options...
ThatBoostedE36 Posted March 20, 2020 Author Report Share Posted March 20, 2020 (edited) Hello, thank you Adamw for the response, went to go source the resistors with no luck so I ordered them online. They finally came in and went to go install them with no luck on getting the coils to fire. Things I did Added a resistor on each wire that goes from the ecu ignition output to each coil( i did it right after the ecu plug) On the other side of each resistor are twisted together crimped go towards the 5v out on expansion loom Coil pin out: Pin 1 12v Pin 2 ground to chassis Pin 3 to ecu Pin 4 ground to head Ecu spark edge is set to rising Coil doesn't even fire on ignition test mode(coils are brand new from ngk) Edited March 20, 2020 by ThatBoostedE36 forgot to add another info Quote Link to comment Share on other sites More sharing options...
ThatBoostedE36 Posted March 20, 2020 Author Report Share Posted March 20, 2020 Quote Link to comment Share on other sites More sharing options...
ThatBoostedE36 Posted March 21, 2020 Author Report Share Posted March 21, 2020 I have moved pin 2 on coil packs from chassis ground to the sensor ground on expansion loom, still no luck. I don't know if a multimeter can keep up with the output signal on the ignition wire but i believe i measured -0.62 when ecu is not on ignition test mode and switching between 4.77 to 4.89 ignition test mode is on Also measuring resistance between pin 2(ecu ground)and pin 3(ecu signal) on the coil(unplugged) i got .389 Quote Link to comment Share on other sites More sharing options...
Adamw Posted March 21, 2020 Report Share Posted March 21, 2020 Can you unplug a coil and measure the resistance between coil pins 2 & 3. I have a vague recollection that some VAG coils have quite low resistance and it may override the pull-up. Quote Link to comment Share on other sites More sharing options...
ThatBoostedE36 Posted March 21, 2020 Author Report Share Posted March 21, 2020 The resistance between coil pins 2 and 3 is 0.389 Quote Link to comment Share on other sites More sharing options...
Adamw Posted March 21, 2020 Report Share Posted March 21, 2020 It won’t be 0.389 ohms? What was the multimeter set to when you done that test? Maybe Kohms? Quote Link to comment Share on other sites More sharing options...
ThatBoostedE36 Posted March 21, 2020 Author Report Share Posted March 21, 2020 Its on the 2k position Quote Link to comment Share on other sites More sharing options...
ThatBoostedE36 Posted March 22, 2020 Author Report Share Posted March 22, 2020 I don't know if I'm doing this right but, after trying the 470ohm resistor. I pulled those out and tried a value 10 times less than the pin resistance (389). The closest I got on hand was 10ohm (close to 40 ohms). So after I popped in a 10ohm resistor on just (one) coil, the others were disconnected. On test mode I got the coil to click but no spark came out of the plug(plug was free airing and ground to head). I gave up but then tired to just crank the car with fueling off and I got the coil to fire! So after loading up each channel with a 10 ohm resistor then bunching up the other side together and crimping it to a wire that goes to +5v out on expansion loom. I get 5 volt output error code 74 and still don't have spark. Quote Link to comment Share on other sites More sharing options...
Adamw Posted March 22, 2020 Report Share Posted March 22, 2020 Yeah thats not going to work. I=V/R = 5V/10ohm = 0.5A. So with a 10ohm pull-up each resistor is going to pull 0.5A. The 5V regulator in the ECU is only capable of about that total and it has to power all the other sensors in the car too. Unfortunately, although 99% of coils out there with a built-in ignitor would of worked with this 470ohm pull-up, these VAG coils are a bit of an odd exception so you've got a combo of ECU and coils that were just not designed with each other in mind. One thing you could try is keep the 470ohm pull-up but connect it to 12V rather than 5V. The 389ohm coil resistance working against the 470ohm 12V pull up should mean the coil will see about a 5.4V signal. Pin 54 is 12V. Quote Link to comment Share on other sites More sharing options...
ThatBoostedE36 Posted March 22, 2020 Author Report Share Posted March 22, 2020 Thanks for the reply adamw, I will try that. Quote Link to comment Share on other sites More sharing options...
ThatBoostedE36 Posted March 23, 2020 Author Report Share Posted March 23, 2020 Adamw you are a genius! The impossible happened and you made it possible! Thank you so much! Quote Link to comment Share on other sites More sharing options...
Kyle.36 Posted July 20, 2020 Report Share Posted July 20, 2020 Any info on wiring into stock ECU? Quote Link to comment Share on other sites More sharing options...
E36nocap Posted September 27, 2020 Report Share Posted September 27, 2020 On 3/22/2020 at 3:42 AM, Adamw said: Yeah thats not going to work. I=V/R = 5V/10ohm = 0.5A. So with a 10ohm pull-up each resistor is going to pull 0.5A. The 5V regulator in the ECU is only capable of about that total and it has to power all the other sensors in the car too. Unfortunately, although 99% of coils out there with a built-in ignitor would of worked with this 470ohm pull-up, these VAG coils are a bit of an odd exception so you've got a combo of ECU and coils that were just not designed with each other in mind. One thing you could try is keep the 470ohm pull-up but connect it to 12V rather than 5V. The 389ohm coil resistance working against the 470ohm 12V pull up should mean the coil will see about a 5.4V signal. Pin 54 is 12V. Ok it seems that we got this to work I’m trying to recreate this exact same set up can either you or the other person in this please help me or just simplify what wires go where I really need some help now I’ve got the resistors and the coils and everything I’m just not having success I just need to see or read exactly what wires go where Quote Link to comment Share on other sites More sharing options...
ThatBoostedE36 Posted September 27, 2020 Author Report Share Posted September 27, 2020 13 hours ago, E36nocap said: Ok it seems that we got this to work I’m trying to recreate this exact same set up can either you or the other person in this please help me or just simplify what wires go where I really need some help now I’ve got the resistors and the coils and everything I’m just not having success I just need to see or read exactly what wires go where The ecu comes with a litte book with a pin out diagram at the ecu On 7/20/2020 at 3:41 AM, Kyle.36 said: Any info on wiring into stock ECU? If u can't change the spark edge and dwell times in ecu then there's no point in wiring them in Quote Link to comment Share on other sites More sharing options...
E36nocap Posted September 28, 2020 Report Share Posted September 28, 2020 Ok so pin42 is 12v I can send that to the vag coil with a resistor for power as I read above I am just curious as to what I do with the oem harness ground and signal wire since the green one is power I’ll leave that one excluded on the vag coils do I connect pin 3 to the oe wire as a signal and then ground it using pin 4 to the brown oe wires or to cylinder head/valve cover (currently I have pin 1 connected to the junction box in the bay for 12v like the n54 guys do with the diy they do) can you help me I’ve gone too far already with this my Instagram is @e36_sonsa Quote Link to comment Share on other sites More sharing options...
Adamw Posted September 28, 2020 Report Share Posted September 28, 2020 5 hours ago, E36nocap said: Ok so pin42 is 12v I can send that to the vag coil with a resistor for power as I read above I am just curious as to what I do with the oem harness ground and signal wire since the green one is power I’ll leave that one excluded on the vag coils do I connect pin 3 to the oe wire as a signal and then ground it using pin 4 to the brown oe wires or to cylinder head/valve cover (currently I have pin 1 connected to the junction box in the bay for 12v like the n54 guys do with the diy they do) can you help me I’ve gone too far already with this my Instagram is @e36_sonsa Note, unless you have an aftermarket ECU, this will not work. The output from the factory ECU (which has an ignitor built-in), produces the exact opposite signal of what these coils require. You will fry the coils in a matter of minutes, and if it does actually run for more than a minute then your ignition timing will give extreme advanace with RPM as your coils will be firing on the dwell edge rather than the spark edge. Quote Link to comment Share on other sites More sharing options...
Mohamed ayed Posted October 2, 2021 Report Share Posted October 2, 2021 @Adamw if i am using this ECU with a BMW V8 Engine M62B44 and I'll run it wasted spark with smart coils each 2 coils wired to one ignition output 470 Ohm should work? Quote Link to comment Share on other sites More sharing options...
Adamw Posted October 2, 2021 Report Share Posted October 2, 2021 What coils? Quote Link to comment Share on other sites More sharing options...
Mohamed ayed Posted October 2, 2021 Report Share Posted October 2, 2021 @Adamw audi R8 coils Quote Link to comment Share on other sites More sharing options...
Adamw Posted October 2, 2021 Report Share Posted October 2, 2021 Not a great choice of coils for this ecu. Try a 240ohm pull-up to 12V. Quote Link to comment Share on other sites More sharing options...
Mohamed ayed Posted October 7, 2021 Report Share Posted October 7, 2021 So what's the best coils to use with this ECU ? Quote Link to comment Share on other sites More sharing options...
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