More WOT AFR stuff

[Romans, Mark]

I previously posted the way to calculate AFR, that method is for a 165 ecm,
using 87-88 code.
I doesn't look like it is accurate for other applications, like for instance
any 89 or later code.
Mark
----- Original Message -----
From: <timsiford at hushmail.com>
To: <gmecm at diy-efi.org>
Sent: Friday, November 17, 2000 5:57 AM
Subject: More WOT AFR stuff


> Went back through some old diacom readings last night.
>
> With the stock chip on my '90 IROC (730) with heads/cam and upgraded stock
> TPI intake I was hitting AFRs of 11.7@ 4200rpms.  After installing the
MiniRam
> and adjusting the WOT AFR vs RPM table Diacom is showing that I am hitting
> AFRs of 11.2 @ 5500rpms.  So, even though I calculated a 10.2 AFR Diacom
> is reporting an 11.2 AFR.  I think that Diacom is correct on this one but
> it is only a hunch.  This is refreshing information for me :-)
>
> Tim
>
> At Thu, 16 Nov 2000 17:46:00 -0500, rr <RRauscher at nni.com> wrote:
>
> >
> >
> >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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