Oxygen sensor and high speed stumble UPDATE

[mrvette]

But from the below convertsation  the question I have is...what affect does the
capability of doing the block learn tables over driving time have o this...seems
that the BLC would correct for any built in errors due to the changes....? 
rite? rong?   GENE

Greg Hermann wrote:
> 
> Hi--
> 
> Good accurate info, in general.
> 
> >The knock you are detecting at part throttle with the aftermarket chip is
> >from lack of EGR... Guaranteed that the chip people only removed the EGR
> >and didn't fix the EGR timing and fuel tables to make it run right without
> >the EGR...
> 
> Yep.
> 
>  GM adds timing and leans the fuel during EGR so there is no loss
> >of power from the EGR.
> 
> As to this one, I have a bridge in Brooklyn you can buy!!
> 
> Yes, they lean it so that CO and HC do not go up, on account of less total
> air, and yes, they advance it so that they get back some of the response
> and mileage screwed up by EGR (mixture diluents are a knock resister, so
> they CAN get away with more advance when EGR is on), but NO WAY you do not
> lose power at equal MAP levels with EGR on vs. off!!
> 
>  Take away the EGR, and now the timing is way too
> >high, and the fuel is too lean because the part of the combustion air that
> >was recirculated exhaust is now air and it needs fuel.
> 
> Yep.
> 
> >This is why a lot of chip makers charge a fortune hoping no one knows what
> >the tables contain... it shows they have no clue as to what they are doing.
> 
> What?!?--people involved in the automotive aftermarket who would screw
> their customers?? Where on earth did they learn such tricks--working for
> auto manufacturers before they went into making aftermarket stuff??!??
> 
> Regards, Greg

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