Help with tuning for 42lb injectors.
01-25-2016, 06:59 PM
#1
Help with tuning for 42lb injectors. I'm pretty new to HP Tuners and I haven't messed with anything regarding fuel delivery yet. I just added 1 7/8 long tubes, 3in duals, and a FAST 90/92 to my 02 formula. I have a set of 42lb injectors that I'd like to add but I'm unsure of what I would need to change in the tune in order to not have them spraying way more fuel than I need.
Can anyone help shed a little light on where to begin? I'm still running the stock cam and I know I likely don't need them yet, but I have to replace two injectors anyway so I might as well add them. I also have a walbro 255lph pump already installed.
Thanks in advance for any advice.
Can anyone help shed a little light on where to begin? I'm still running the stock cam and I know I likely don't need them yet, but I have to replace two injectors anyway so I might as well add them. I also have a walbro 255lph pump already installed.
Thanks in advance for any advice.
01-25-2016, 07:29 PM
#2
Moderator
The first step is to get the full tuning parameters for those injectors.
Injectors have not only a max capacity, but different (and non-linear) rates at low volume and react to voltage differently. Hence you need the complete tuning parameters.
If you tell us what you have and where you bought them, we might be able to help with the tuning parameters.
Hopefully not ebay, because many of them are counterfeit injectors with completely different (and perhaps unknown) tuning parameters and poor consistency.
Once you have the tuning parameters, in HP Tuners go to Engine -> Fuel -> General and the tuning tables are all under "Injector Control General". Sure the "Flow Rate" is most important, but the Offset is important if you wan the car to start/run under all conditions and the "Short Pulse Adder" is important if you want the car to idle well and run well at low throttle.
Injectors have not only a max capacity, but different (and non-linear) rates at low volume and react to voltage differently. Hence you need the complete tuning parameters.
If you tell us what you have and where you bought them, we might be able to help with the tuning parameters.
Hopefully not ebay, because many of them are counterfeit injectors with completely different (and perhaps unknown) tuning parameters and poor consistency.
Once you have the tuning parameters, in HP Tuners go to Engine -> Fuel -> General and the tuning tables are all under "Injector Control General". Sure the "Flow Rate" is most important, but the Offset is important if you wan the car to start/run under all conditions and the "Short Pulse Adder" is important if you want the car to idle well and run well at low throttle.
