Port Injection Question

henrydavison

New Member
Jan 24, 2025
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I want to add port Injection to my car, I bout the Precision Stage 3 LPFP dual Walbros. and it says it comes with the wiring and Hobbs Switch. Would I need a secondary fuel pump control module Aswell? or does that come with it? Do I need to buy anything else to support the ported injection? Here is everything I have/will do on the Car. 7.5in stepped intercooler, Catless downpipes, 2in inlets and outlets, dci, 2 step colder sparkplugs, eldor coils, index 12 injectors, chargepipe and bov, stage 3 fuel pump with wiring harness and Hobbs switch, 750cc port injection, ekpm3, and hybrid turbos (not sure which brand yet).
 

SlowE93

Major
Jul 2, 2017
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Just a plane ticket away !
Ride
E93
I want to add port Injection to my car, I bout the Precision Stage 3 LPFP dual Walbros. and it says it comes with the wiring and Hobbs Switch. Would I need a secondary fuel pump control module Aswell? or does that come with it? Do I need to buy anything else to support the ported injection? Here is everything I have/will do on the Car. 7.5in stepped intercooler, Catless downpipes, 2in inlets and outlets, dci, 2 step colder sparkplugs, eldor coils, index 12 injectors, chargepipe and bov, stage 3 fuel pump with wiring harness and Hobbs switch, 750cc port injection, ekpm3, and hybrid turbos (not sure which brand yet).
You need a PI controller to tell the injectors when to fire.
 

whyzee125

Private
May 3, 2023
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The Hobbs switch is how the secondary pump will be controlled. The main pump will run off of the EKP and will still use PWM. The secondary pump will only kick on when the Hobbs switch activates (usually 15psi). When the Hobbs switch is triggered, the second pump will run at full tilt (no PWM). You will need a controller for your PI rail but not for your secondary pump if you go the Hobbs switch route.