Handheld tuners?
03-30-2007, 04:33 PM
#1
Handheld tuners? Do the handheld tuners like Vinci or Comp cams change the MAF calibration at all?
They just have a setting for increasing the PE by so many percent but it doesn't explicitly say what it is doing.
I don't use them to tune, but, was wondering.
They just have a setting for increasing the PE by so many percent but it doesn't explicitly say what it is doing.
I don't use them to tune, but, was wondering.
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04-01-2007, 01:08 PM
#8
VE tables play a large roll in part throttle fueling...maf basically takes over after 4000 rpms though...they work hand in hand in the end. Here's a quick rundown of the 4 major areas of fueling though
IFR-injector flow rate-alters fueling across the entire curve but as its name states its basically telling the computer what the injectors flow at a given point.
VE-when maf is in use it mainly serves as a reality check
PE-power enrichment-comes into play once its delay parameters are met generally to increase fueling to make more power...sometimes also referred to as open loop.
MAF-used for most part throttle fueling & most fueling calculations after 4000rpms in LS1's
each one of these tables(and several more) work hand in hand with each other to figure out your final fueling.
Generally speaking...if all of your tables are setup properly your commanded afr will match your actual...at least thats always my goal.
Its also easier to not only understand but adjust on a dyno when your commanded=actual afr. When they match just move the pe table up or down to figure out max power=done.
Also For a newbie coming in it would be easy for them to get confused when they see their commanded being say 11.5:1 yet their actual is at 10.5:1.
IFR-injector flow rate-alters fueling across the entire curve but as its name states its basically telling the computer what the injectors flow at a given point.
VE-when maf is in use it mainly serves as a reality check
PE-power enrichment-comes into play once its delay parameters are met generally to increase fueling to make more power...sometimes also referred to as open loop.
MAF-used for most part throttle fueling & most fueling calculations after 4000rpms in LS1's
each one of these tables(and several more) work hand in hand with each other to figure out your final fueling.
Generally speaking...if all of your tables are setup properly your commanded afr will match your actual...at least thats always my goal.
Its also easier to not only understand but adjust on a dyno when your commanded=actual afr. When they match just move the pe table up or down to figure out max power=done.
Also For a newbie coming in it would be easy for them to get confused when they see their commanded being say 11.5:1 yet their actual is at 10.5:1.
