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.
Anyone got any input on 4L80E line pressures? Infact anyone know what the rise rate should be with throttle position?
I know the standard controller uses TPS for load, and my installation does too (the axis label is wrong). So I'm just interested to know what the standard rise rate is, is it linear with throttle position, or is 100% line pressure achieved at say 50% throttle and it's linear to there. Or does it rise exponentially with throttle position?
I set my lowest row based on the standard line pressure with a closed throttle. So I have about 75psi at 50% duty and 180psi at 100% duty (at idle speed)
Mine is set very similar and has been successfully driving well for the past two years. I even did some doodling with pressure values in the low speed and load region to make it feel like a stock cushy box I've ran it on slicks a few weekends a year and works really well. The "load" should be a function of TPS And RPM if you're using the default table in TunerStudio.