The factory ECU software is able to be reconfigured to allow simultaneous injection from HPDI and MPI system. This requires the installation of additional hardware for the USDM vehicles. This guide will walk you through the necessary steps to allow the software to control the additional injectors. This feature is only available on our COBB CCF rom. 2015-2019 USDM GTI and Golf R's all have the ability to upgrade to the USDM Volkswagen CCF Mk7 GTI / Audi A3 (CXCA 5G09C0BB01) or USDM Volkswagen CCF Mk7 GTI / Audi A3 (CXCA 5G0906259Q) or USDM Volkswagen CCF Mk7 Golf R / Audi S3 (CYFB 8V09C0BB01) or the USDM Volkswagen CCF Mk7 Golf R / Audi S3 (CYFB 8V0906259Q).
The stock roms for each car do not support this feature on the COBB platform.
For additional information check out our live webinar recorded august 2019
VW MPI Webinar 8/19
The ability to use a secondary rail with Port Fuel injection is available in the following COBB Consolidated CCF Roms:
USDM Volkswagen CCF Mk7 GTI / Audi A3 (CXCA 5G09C0BB01)
USDM Volkswagen CCF Mk7 GTI / Audi A3 (CXCA 5G0906259Q)
USDM Volkswagen CCF Mk7 Golf R / Audi S3 (CYFB 8V09C0BB01)
USDM Volkswagen CCF Mk7 Golf R / Audi S3 (CYFB 8V0906259Q)
In order to activate the ability to use the secondary fuel rail and injectors, select the 'Enable Secondary MPI Injectors' check box.
Optionally, you can 'Enable LPFP Closed Loop Feedback' as well. This allows closed loop control of the low pressure fuel system using tables discussed later.
At a minimum, to get up and running with a new MPI system, the following tables must be changed:
Cyl 4 Inj Time MPI Pulse - Injection Time at Cylinder 4 for Secondary Injector
Cyl 3 Inj Time MPI Pulse - Injection Time at Cylinder 3 for Secondary Injector
Cyl 2 Inj Time MPI Pulse - Injection Time at Cylinder 2 for Secondary Injector
Cyl 1 Inj Time MPI Pulse - Injection Time at Cylinder 1 for Secondary Injector
Fuel Injection System Split - Current Split between HPDI and MPI injection System
Mass Fuel Flow Set Point MPI - Mass Fuel Flow Sent to MPI injection system
Fuel Pressure Differential MPI - This is the differential fuel pressure at the tip of the injector. (Low pressure fuel system rail pressure - Manifold Pressure)
Mass Fuel Flow Reference Delta - Difference between the mapped reference mass fuel flow and fuel flow calculated from the level 2 monitoring system
LPFP Pressure Actual - Actual fuel pressure in low pressure rail
LPFP Pressure Delta - Difference in the actual pressure in the low pressure rail versus the set point
LPFP Pressure Set Point - Low pressure set point for rail pressure
LPFP Prop Feedback - Proportional feedback to LPFP controller. (Enable LPFP Closed Loop Feedback must be enabled for this to work)
LPFP Int Feedback - Integral feedback to LPFP controller. (Enable LPFP Closed Loop Feedback must be enabled for this to work)