Hello - first time poster here.
I have been wanting to build a Megasquirt for awhile but car hobby time has been occupied by other projects. The time has finally come for me to take the plunge. I have been considering a MS2 for my 2.0 Duratec powered Locost but am not entirely certain about the ignition wiring. I would like to use the factory COP system since I already have them. I have measured the resistance of each oil at between 0.8 and 0.9 ohms (sorry I am not able to measure the inductance number - I know it would likely help).
Based on DIY Auto Tune's website, the BIP373 is capable of handling approximately 11.5A normally. If I wire one coil to one igniter, I = V/R = 12V/0.8 ohms = 15A and I exceed the manufacturer's specs however if I wire two coils in series I get I = 12V/(2 * 0.8 ohms) = 7.5A.
Is this commonly done with Megasquirts? The reason I ask is that I have wired FSAE cars using PE ECU's before and this is how they configure their ignition system to prevent damage to the igniters but I have seen no mention of a similar practice in the MS community.
Thanks,
atm92484
2.0L Duratec wasted spark ignition coil wiring
Forum rules
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If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0). For tuning/troubleshooting questions, please attached a datalog and your MSQ file to your post.
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The full forum rules are here: Forum Rules, be sure to read them all regularly.
Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0). For tuning/troubleshooting questions, please attached a datalog and your MSQ file to your post.
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
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Matt Cramer
- Super Squirter
- Posts: 2951
- Joined: Sat Jul 03, 2004 11:35 am
Re: 2.0L Duratec wasted spark ignition coil wiring
I would use one coil per ignitor. BIP373s are pretty hard to damage - we tried just about everything, including hooking one to a 12 volt 60 amp power supply directly and wiring its input to a 5 volt source. The only thing we've seen damage a BIP373 was reversing its wires.
