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 discussion of MicroSquirt (TM) from Bowling and Grippo. The MicroSquirt information site is at www.usEasyDocs.com
Forum rules
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.
The original poster was asking about not using the bypass relay (or another bypass signal). If you leave 5 Volts on the bypass pin at all times, then MS-II has control over the timing, even during cranking. By having it send a 'trigger return' output to the module, you get essentially the same timing as you would in bypass mode, but without the relay and without using up a processor output.
Lance.
Hi Lance
I was looking for old solutions in the web for 5v on bypass in HEI which I use. I have MS-II V2.36 and I wander if I must have constant 5v på bypass or it´s quit enough with the "trigger return" output and let the bypass pin alone.
Unless the 7/8-pin HEI module sees 5V of the B pin, it uses the trigger directly.
So yes, you need to supply 5V to the B pin. If you are using trigger rise, you can supply 5V at all times, and not use a relay (you can also use one of the spare ports to trigger the 5V to the B pin).
So there's a number of ways to do it, but the bottom line is you need 5V to pin B whenever you want MegaSquirt to control the timing.
Unless the 7/8-pin HEI module sees 5V of the B pin, it uses the trigger directly.
So yes, you need to supply 5V to the B pin. If you are using trigger rise, you can supply 5V at all times, and not use a relay (you can also use one of the spare ports to trigger the 5V to the B pin).
So there's a number of ways to do it, but the bottom line is you need 5V to pin B whenever you want MegaSquirt to control the timing.
Lance.
Ahha.. so u mean I´ll supply 5v from MS Vref and set the cranking trigger på "trigger rise" not trigger return?