motron 60# injectors....
Ed Wright is right. The injector offset is VERY important when you change the injectors. I just did a set of 60/hr Siemens injectors today. Having the voltage offset table set correctly is important. Tuning the VE table or MAF is just a bandaid if this table is screwed up.
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the motrons are rated at 43.5psi correct?
and i set the IFR table to:
rated : 43.5
actual rail pressure: 58
injector size : 60
and i get like 8.8 i think it is or 8.08....can't remember right now
and i set the IFR table to:
rated : 43.5
actual rail pressure: 58
injector size : 60
and i get like 8.8 i think it is or 8.08....can't remember right now
Originally Posted by RedHardSupra
ok, then what is right, or at least how do you arrive at what is right?
I want to make sure we're all on the same page here, Geoff and Ed keep talking about Injector Offset. Are you guys meaning the offset table as in the one that adds to the injector pulse to compensate for the delay before the injector physically operates, or are you referring to the main Injector Flow Rate table which is "typically" changed to compensate for bigger injectors?
Originally Posted by SMOKINV8
I want to make sure we're all on the same page here, Geoff and Ed keep talking about Injector Offset. Are you guys meaning the offset table as in the one that adds to the injector pulse to compensate for the delay before the injector physically operates, or are you referring to the main Injector Flow Rate table which is "typically" changed to compensate for bigger injectors?
I am referring to the voltage offset table. This is the table that adds pulsewidth based on the battery voltage.
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Originally Posted by SMOKINV8
Would you be willing to share a little knowledge about dialing it in? 
To be more specific, how do you verify what is a voltage offset error vs an IFR error?
To be more specific, how do you verify what is a voltage offset error vs an IFR error?
do elaborate as I'm still new to this tuning....learning new things everyday
Originally Posted by Ed Wright
First, you start off with tuning that is not already screwed up (One guy was talking about having -10/-12% fuel trims before he installed them. That would be a tough one.) Scale the injector slope correctly, then walk through the injector off set table (on the street, or use the dyno to vary the loads like I do), watching system voltage and manifold vacuum, tweak that table until your fuel trims come in line. Just make scaling changes by percent. When you get close, 5% will be a big change. It's not hard to spend half a day on that table. Depends on how **** you are.
If I understand you correctly, the way to get the correct voltage table values for a given injector would be to take a stock car with a "close" tune (0 to -2 LTRIMS), swap the injectors, set the IFR table and drive/log system voltage vs. fuel trims for given cells ?
...by chance anyone got that table for greentop 42#'s or Mototron 60's ?
Rob (Bad30th)
Originally Posted by Bad30th
...by chance anyone got that table for greentop 42#'s or Mototron 60's ?
Originally Posted by ZL1Killa
the motrons are rated at 43.5psi correct?
and i set the IFR table to:
rated : 43.5
actual rail pressure: 58
injector size : 60
and i get like 8.8 i think it is or 8.08....can't remember right now
and i set the IFR table to:
rated : 43.5
actual rail pressure: 58
injector size : 60
and i get like 8.8 i think it is or 8.08....can't remember right now
Originally Posted by RedHardSupra
c5...which year which type?
Z06 offset tables are closer to delphi injectors, i.e. less offset (faster) for the most part.
Originally Posted by muncie21
2000 and down coupes. I don't know where the cutoff is, but the 2004 (coupe) offset table is closer to the Z06 than it is to the 2000 and earlier coupes.
Z06 offset tables are closer to delphi injectors, i.e. less offset (faster) for the most part.
Z06 offset tables are closer to delphi injectors, i.e. less offset (faster) for the most part.
Rob (Bad30th)
I am sorry but I am missing the explanation about the voltage offset and how to determine the correct injector offset. Is this something that could be setup with a spreadsheet or are there more variables required in order to determine the correct offset?
Originally Posted by 98Z28CobraKiller
I am sorry but I am missing the explanation about the voltage offset and how to determine the correct injector offset. Is this something that could be setup with a spreadsheet or are there more variables required in order to determine the correct offset?
In short, the injector offset is the amount of time it takes the injector to react. There are several variables that affect this, including type of injector, voltage applied and differential pressure, among others.