Backstory: Been self tuning my car out of fun, as I enjoy doing it and learning more about the logic making it all happen. Trying to stay as safe as I can as I increase boost. Stock turbos had no issues getting the boost target to play nice. This started happening after the turbo swap and trying to dial the WGDC back to match PID's and keep the throttle from closing, as I was under the base the entire time PID wise and seeing some significant throttle closure. I adjusted the WDGC position back to wastegate table as I was reading on the WGDC calculation and came up with this as reference from information found to get some idea of where my final WGDC is originating from and what effects it the most. I know there are a couple more tables that effect the final WGDC, but I chose this one to adjust mainly to keep my PID's happy and adding vs removing. I also rescaled a couple of the tables including: WGDC Base, and Adder to match the MAF (req WGDC) I was seeing.
Slowly been adding to the guide by V8bait to give it more detail and be a one stop shop for better understanding the logic behind the DME. There is some really really good information on this forum. and I've looked for anything in regards towards this weird behavior I'm seeing to better understand it. I checked all vacuum lines, and they're solid. So I don't think this is leak related. Somehow the DME decides to target 3-4 psi under what it was targeting right before say 18psi then targets 15psi then back to 18psi and back and forth throughout the pull. So I'm getting these wavy like boost targets causing my PID to freak out. I've tried adjusting D-Factor multiplier as well as D-factor tables, I've tried lowering and raising, and nothing seems to keep it happy. I might not be fully understanding what's going on. I was looking for more information on how the DME calculates the final boost target... I did see some mentions on the boost forums, but due to recent events we have lost access to all of those forums...losing tons of information. Could this perhaps be solenoid related? Does the DME somehow take that into consideration for boost target? Like say if not is not responding how it should be? I have the function frame for MSD80, just not sure where to look exactly for logic information on this as I don't know what the DME references this as. Any information is more than welcome and feel free to give me any advice as well on my tables. The car otherwise seems very happy. No misfires or odd feelings, just this boost target going up and down gives it a back and forth feeling when WOT during logging. I also looked into torque tables and logged some of those values as well. Not seeing any active torque limits in place, and torque seems to build up just fine, no hard cuts...Load targets are also fine, and didn't see any change in load request throughout the pull. I'm at a complete loss at the moment.
Car Specs:
RB2+ Turbos
RB Inlets
VRSF Outlet
VRSF 7.5" Intercooler
VSRF Chargepipe with TurboSmart BOV
VS Map sensor adapter for larger reference.
NGK 97506 Plugs gapped @ .020
Bimmer Life coils
Dual catch can with RB external PCV
I've attached my log link as well as my bin and xdf I'm currently using.
Link to log: https://www.spoolstreet.com/graphs/boost-target-going-crazy.17422/?series=2,20&zoom=-47,4757
Slowly been adding to the guide by V8bait to give it more detail and be a one stop shop for better understanding the logic behind the DME. There is some really really good information on this forum. and I've looked for anything in regards towards this weird behavior I'm seeing to better understand it. I checked all vacuum lines, and they're solid. So I don't think this is leak related. Somehow the DME decides to target 3-4 psi under what it was targeting right before say 18psi then targets 15psi then back to 18psi and back and forth throughout the pull. So I'm getting these wavy like boost targets causing my PID to freak out. I've tried adjusting D-Factor multiplier as well as D-factor tables, I've tried lowering and raising, and nothing seems to keep it happy. I might not be fully understanding what's going on. I was looking for more information on how the DME calculates the final boost target... I did see some mentions on the boost forums, but due to recent events we have lost access to all of those forums...losing tons of information. Could this perhaps be solenoid related? Does the DME somehow take that into consideration for boost target? Like say if not is not responding how it should be? I have the function frame for MSD80, just not sure where to look exactly for logic information on this as I don't know what the DME references this as. Any information is more than welcome and feel free to give me any advice as well on my tables. The car otherwise seems very happy. No misfires or odd feelings, just this boost target going up and down gives it a back and forth feeling when WOT during logging. I also looked into torque tables and logged some of those values as well. Not seeing any active torque limits in place, and torque seems to build up just fine, no hard cuts...Load targets are also fine, and didn't see any change in load request throughout the pull. I'm at a complete loss at the moment.
Car Specs:
RB2+ Turbos
RB Inlets
VRSF Outlet
VRSF 7.5" Intercooler
VSRF Chargepipe with TurboSmart BOV
VS Map sensor adapter for larger reference.
NGK 97506 Plugs gapped @ .020
Bimmer Life coils
Dual catch can with RB external PCV
I've attached my log link as well as my bin and xdf I'm currently using.
Link to log: https://www.spoolstreet.com/graphs/boost-target-going-crazy.17422/?series=2,20&zoom=-47,4757
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