Tuning question!
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TECH Regular
Joined: May 2005
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Tuning question! Has anyone EVER heard of "Tuning Come Off Computers?"
I.E: Changing fuel maps and such?
My friend SWEARS that a tune is Guarenteed to stay on a PCM. That tunes come off and all the tuning you did is physically changed. I'm not talking about the way the car runs. GOing from hot to cold weather and all that nonsense. I mean physically re tuning the car because the tune you gave it... is gone.
Has anyone ever heard of that?
I.E: Changing fuel maps and such?
My friend SWEARS that a tune is Guarenteed to stay on a PCM. That tunes come off and all the tuning you did is physically changed. I'm not talking about the way the car runs. GOing from hot to cold weather and all that nonsense. I mean physically re tuning the car because the tune you gave it... is gone.
Has anyone ever heard of that?
If you are using closed loop fueling then yes, your tune is constantly changing to whatever the fuel trims dictate. Up to +/-25% fueling error can be present before a rich or lean code will show up.
Thread Starter
TECH Regular
Joined: May 2005
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Originally Posted by Doc
If you are using closed loop fueling then yes, your tune is constantly changing to whatever the fuel trims dictate. Up to +/-25% fueling error can be present before a rich or lean code will show up.
IMHO,
a car that runs Closed Loop that has fuel trims greater than ~-/+2% will not be optimal and any further will start to get into the crap realm, too rich and you are wasting gas and too lean and you are gonna go boom.
a car that runs Closed Loop that has fuel trims greater than ~-/+2% will not be optimal and any further will start to get into the crap realm, too rich and you are wasting gas and too lean and you are gonna go boom.
