The MegaSquirt Project has experienced explosive growth other the years, with hundreds of new MS installations occurring every week - a phenomenal success! MegaSquirt has been successfully used in all aspects of Internal Combustion engine applications including R&D, Industry, Race, and Research. The MS project has transformed itself from a simple R&D project into a full-featured mature engine control system. To reflect this the support structure has also changed to meet the needs of MegaSquirt Users.
Moving forward, the R&D forums for MegaSquirt project are in a read-only mode - no new forum posts are accepted.
However the forums will remain available for view, they still contain a wealth of information on how MegaSquirt works, how it is installed and used. Feel free to search the forums for information, facts, and overview. While the R&D forum traffic has slowed in recent years, this is not at all a reflection of Megasquirt users, which continue to grow year after year. What has changed is that the method of MegaSquirt support today has rapidly moved to Facebook, this is where the vast majority of interaction is happening now. For those not on Facebook the msextra forums is another place for product support. Finally, for product selection assistance, all of the MegaSquirt vendors are there to help you select a system, along with all of the required pieces to make it complete.
This forum is for discussing ignition setup, tuning, and troubleshooting for MicroSquirt (TM)
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Read the manual to see if your question is answered there before posting. If you have questions about MS1/Extra or MS2/Extra or other non-B&G code configuration or tuning, please post them at http://www.msextra.com The full forum rules are here: Forum Rules, be sure to read them all regularly.
Big Creek wrote:I went ahead and installed another coil and this worked to fool the ignitor to send a signal to the stock ECU so it would not shut down the injectors. I'll try to come up with something cleaner later.
Todd
Why don't you drop the vb921 and use the factory ignitor to fire the coil? The factory ecu will still accept the igf signal from the ignitor irregardless of the fact the megasqirt is triggering igt or the factory ecu is triggering igt.
This works quite well since I have used megasquirt as kind of piggy back fuel controller that controls fuel and spark and the factory ecu is still present for idle control and other vehicle computers that it needs to communicate with.
Ryan
I would love to do this! I haven't figured out how yet. I am a bit confused on how to go about it. I hate being one of those people who expects others here to explain EXACTLY how to do things when I know the information is already somewhere else. I think my problem is I don't understand things like "pull-up resistors" etc... The search function here leaves a little to be desired too.
If you or someone else could just give me some clue as to were to look I would appreciate it. Thanks,
All you need to do is set up MS with its own sensors and take control of the injector, fuel pump and ignition wiring and leave all other connections to the old ECU in place. I did this with mine while i was en-route to full plug-and-play swappable. Worked fine except the idle control of the stock ECU screwed everything up - when in a non-idle position it would *open* fully and leave me revving at 2500rpm at the lights. Bloody annoying, hence the swap over to full control.
I understand I can take full control of the engine management (and I may do this at a later date) but for now I am wondering if I can use my trigger set up (basically 2 bolts welded to the front crank pulley 180° apart passing a VR sensor at 60° BTDC) to trigger MS to control the OE Toyota ignitor. I'm going to do some more scoping of the stock trigger and see if it can be matched by the MS somehow. Maybe I can use the HEI or Neon output?
I'm running two Camry coilpack/igniters. They are a wasted spark all-in-one coil and igniter set. I'm triggering the IGt off of two of the front panel LED's with a pullup resistor to 5v.
I understand I can take full control of the engine management (and I may do this at a later date) but for now I am wondering if I can use my trigger set up (basically 2 bolts welded to the front crank pulley 180° apart passing a VR sensor at 60° BTDC) to trigger MS to control the OE Toyota ignitor. I'm going to do some more scoping of the stock trigger and see if it can be matched by the MS somehow. Maybe I can use the HEI or Neon output?
Todd
Set it up as a wheel decoder, with a 36-2 wheel. Wire the the open ended shielding to the ground on the board, as well as the negative wire of the sensor. It will work (it does on mine).
PCB V3.0
MSNS-E 29q2
Toyota Tacoma
2.4L 4 cyl. 16valve DOHC
distributor controlled w/vb921
ochizon wrote:
Set it up as a wheel decoder, with a 36-2 wheel. Wire the the open ended shielding to the ground on the board, as well as the negative wire of the sensor. It will work (it does on mine).
I would do this except everything I have read says you can't share a VR input and I would need to share it with the stock ECU.
ochizon wrote:
Set it up as a wheel decoder, with a 36-2 wheel. Wire the the open ended shielding to the ground on the board, as well as the negative wire of the sensor. It will work (it does on mine).
I would do this except everything I have read says you can't share a VR input and I would need to share it with the stock ECU.
Todd
hmmm, good point. I dont know the answer to that one.
PCB V3.0
MSNS-E 29q2
Toyota Tacoma
2.4L 4 cyl. 16valve DOHC
distributor controlled w/vb921
coyoteboy wrote:Closest you could do would be an identical sensor mounted X degrees out and set up MS to use that.
Can't do that as the wheel is mounted inside the timng cover so i would need another boss in the block for the sensor. Guess I'm going to have to deal with what I have. Thanks for the help on this guys!
I have shared VR inputs between a megasquirt and a toyota ecu, it works fine! Just use a occilliscope to insure the waveform hasn't been modified any or the amplitude of the waveform isn't to low. So far I have done two vehicles this way, furthermore the megasquirt triggers the ignitor well enough for the factory ecu to not set any igf codes.
You should be able to use one of the ignition outputs to trigger igt on the factory ignitor. Insure that the output is NON INVERTED or the LED output is pulled low or grounded when the engine is not running. The factory ignitor is looking for a 5v high (from a 1k pull-up resistor to 5v) to charge the coil then when the signal goes low the ignitor then fires the coil.
As long as the factory ecu sees igf and speed signals from the cam and crank sensors, it will function as though it was in control of the engine.