Question about WOT table in $8D bin

[rr]

Umm, I just checked the anht hac, and I can't get the equation quoted
below to give me the same answers as the code.

Using tables L860D & L8617 @ 80c & 6400rpm, I get an AFR of
11.6:1. Here is the equation using the raw bin values:

WOT AFR = 6553.6 / ((TBL L8617 + TBL L860D + 128) * 445) / 256)

w/vals:

11.6 = 6553.6 / ((138 + 58 + 128) * 445) / 256)

This is right from the hac and matches the code (I corrected the one table
address in the equation). What are the AFR's when using this equation?

Thanks,

BobR.


JN wrote:

> Wow, in looking at my bin that was modified by a reputable tuner originally,
> he has what I calc as a 14.12 AFR at 5200 and a 14.85 at 5600!  I guess with
> the miniram I should fatten these up some.  Tim, what do you have for PE vs
> RPM.  Our motors are similar cams, intake and we both run 30 pound injectors
> with a 33 pound injector constant.
>
> Jason
> ----- Original Message -----
> From: <timsiford at hushmail.com>
> To: <gmecm at diy-efi.org>
> Sent: Wednesday, November 15, 2000 4:04 PM
> Subject: Re: Question about WOT table in $8D bin
>
> > Bruce,
> >
> > I don't think its as bad as what you are saying.  Please - hear me out.
> >  I said that the calculation shows that I am running 10.16 AFR.  This was
> > at 5600rpms and a coolant temp of 80deg C.  HOWEVER, the stock AUJP bin
> > has a PE modifier of 7.8 at 4000rpms in WOT %Change in AFR vs RPM and a
> > modifier of 22.7 in WOT %Change in AFR vs Coolant.  This results in a
> 10.22
> > AFR.
> >
> > Now, I am NOT running 10.16 everywhere.  I just picked the highest point
> > of the curve and reported that point.  I also picked the highest point of
> > the AUJP curve and reported that.  Again, the formula I am using is the
> > one previously supplied here on the list ....
> >
> > ( 1  -  (( RPM Mod  +  Coolant Mod )  /  100 )  *  14.7
> >
> > I am not concerned about the fueling.  I am close to 128 at all points
> when
> > driving.  I spent significant time on the VE curves.  The WOT %Change to
> > AFR tables are modified from stock ... but, no so much in the levels but
> > more as to the shape.  The MiniRam doesn't need as much fuel at 4000RPMs
> > as compared to the TPI.  However, it does need more at 5600rpms.
> >
> > Tim
> >
> > At Wed, 15 Nov 2000 12:28:20 -0500, "Bruce Plecan" <nacelp at bright.net>
> wrote:
> >
> > >
> > >
> > >IMO,
> > >Your running a diesel now.
> > >You have enough fuel that your CR is even up.
> > >At tear down the ring lands will be knocked out and you'll need pistons.
> > >Just about beat you have a 160d and within one heat range of stock plugs.
> > >The tip of the plug is acting like a glow plug for lighting the change.
> > >It kinda a typical thing when your at more fuel more timing agenda stuff,
> > >just some guys go that route wastes gas, and tough on parts IMO.
> > >No telling what the heads will be like, if (oem) iron probably cracked
> > >between the seats.
> > >Also, will have more carbon to deal with and more likely to burn an
> > >exhuast
> > >valve.
> > >It's like doing a nitro tune but with gas, eats parts
> > >Bruce
> > >
> > >
> > >> >Just remember you said that <g>
> > >>
> > >> I'll remember Bruce <g>.  But, I'm not a fluke.  I've talked to several
> > >> other AFR190/MiniRam ownders that are running the same type of spark
> > >advance
> > >> (max).  Now sure about the Air/Fuel ratio they are running though.
> > > Will
> > >> be pulling plugs soon to take a gander.
> > >>
> > >> Curious though .... I have a feeling that you think I'm gonna blow
> > >myself
> > >> up :-)  Can I pick your mind and ask why?  I know that I will
> eventually
> > >> lose the bottom end ... but, I don't think that it will be PROM
> related.
> > >>
> > >> Tim

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