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.
A forum for discussing applications and implementations of the MegaShift transmission controller code for the GPIO from B&G. This can control up to 8-speeds and 6 shift solenoids (plus a 16x9 table for controlling a PWM line pressure valve). It has manual and fully automatic modes (16x9 load x speed table), with under and over rev-limit protection, and full data logging of all inputs and outputs (among many other abilities). A TransStim to test your completed board is also available.
I'm stuck and could use some expert eyes on the project. Is there anyone in the So Cal area who'd be willing to assist? I'm willing to pay shop rates at this point.
Vehicle is a 2000 Jeep Wrangler with a VW 1.9 TDI mated to a 4L65e. There's a MSGPIO/MegaShift controller built per the B&G build guide. It runs great and will shift through all gears.. usually. I'm having trouble with getting the VSS to function consistently. There also may be an issue with low line pressure if my gauge isn't telling me the truth.
These forums have been great for getting me to this point but this last issue appears to need better eyes than mine.
Grab a drac off of a Chevy. I could not get the "oem" gpio vss to work so I made a custom vss circuit but it flip flopped and doubled the input pulse frequency. Then I did the drac mod and it works real good. One of the issues I was having with the custom thing I made is I also run the " cable x " mechanical speedo converter and it never worked right until the drac mod. Now that works great too
How about the serial connection? Pin 17 is the sensor ground, currently I have it connected to the trans temp sensor ground, serial comm ground (DB9 pin5), line pressure ground, AND VSS.
Can I move the serial ground to chassis ground?
The manual says 17-20...I think... are good for serial ground. I would keep it close to the plug on gpio to avoid noise/ground loop issues
Busy with frightdome setup here in vegas but if get some time I will post pics/schematic of how I did it.......