MAF & base fuel tables

[Knowlden and/or Eller]

Ken, byte values for the MAF tables.

Bob

-----Original Message-----
From: owner-gmecm at esl.eng.ohio-state.edu
[mailto:owner-gmecm at esl.eng.ohio-state.edu]On Behalf Of Ken Kelly
Sent: Wednesday, June 23, 1999 3:55 PM
To: gmecm at efi332.eng.ohio-state.edu
Subject: Re: MAF & base fuel tables


Bob,
	In the 94 and up vettes the MAF calibration table is
integer values, not byte values. Did they use byte values in
89?

		Ken

Knowlden and/or Eller wrote:
>
> Wayne, I have just about completed a pretty comprehensive map, .ecu file,
of
> apyp, the memcal for my '89 vette. When I get it cleaned up, probably
Monday
> or Tuesday (I am leaving for Bloomington "Corvette Gold", Ill. tomorrow) I
> will put it on the ftp site. From what I can tell the MAF tables are there
> specifically to calibrate the MAF, i.e. what voltage (or freq.) equals how
> many gps, of course the only way to know is to try it, and yes I do
believe
> it needs to be done. The question is how? I can think of a couple of
> alternative ways but something tells me a flow bench would probably be THE
> way. This is something I need to pursue myself.
>
> Just had a thought, I have the screens out of mine and the BLM and
> Integrator are all right on i.e. 128 of course this doesn't tell me
anything
> about wide open throttle. I will have a UEGO working in the next couple of
> weeks then I'll know a little bit more.
>
> The devil is in the details.
>
> Regards,
>
> Bob
>
> Regards,
>
> Bob
>
> -----Original Message-----
> From: owner-gmecm at esl.eng.ohio-state.edu
> [mailto:owner-gmecm at esl.eng.ohio-state.edu]On Behalf Of W Johnson
> Sent: Wednesday, June 23, 1999 9:02 AM
> To: gmecm at efi332.eng.ohio-state.edu
> Subject: Re: MAF & base fuel tables
>
> Guys,
>
> I have a 89 Corvette and have been testing a stock MAF vs a TPIS Modified
> MAF (has screens and heat sink removed). Diacom shows smaller air flow
> numbers with the TPIS MAF. This makes sense because more area equals less
> velocity which equals less cooling of hot wire. Problem is, LV8 along
> with spark advance and other things are out of whack because of the
> incorrect air flow numbers. Question is, does anyone know how to correct
> the MAF tables? Is it correct to assume this is what needs to be done? I
> would love to see what TPIS does with their eproms. Does anyone know?
>
> Thanks,
> Wayne Johnson
>
> On Tue, 22 Jun 1999 22:35:17 -0400 "Knowlden and/or Eller" <ke at clark.net>
> writes:
> >There are multiple tables and they
> >are
> >scalar i.e. table 1 0-22 gps, table 2 22-47 gps, etc. It looks like
> >"all"
> >you would have to know is  the freq/volt vs air flow in grams per
> >second.
> >
> >I feel like I am on treasure hunt.
> >
> >Regards,
> >
> >Bob
> >
> >-----Original Message-----
> >From: owner-gmecm at esl.eng.ohio-state.edu
> >[mailto:owner-gmecm at esl.eng.ohio-state.edu]On Behalf Of Ward
> >Sent: Tuesday, June 22, 1999 3:20 PM
> >To: gmecm at efi332.eng.ohio-state.edu
> >Subject: Re: MAF & base fuel tables
> >
> >
> >Probelbly a very good objective, but you will need to generate new
> >tables
> >since the flow values are different.
> >Ward
> >
> >On Mon, 21 Jun 1999 18:51:11 -0400, Jon Fedock wrote:
> >
> >>
> >> -----Original Message-----
> >> From: Knowlden and/or Eller <ke at clark.net>
> >> To: gmecm at efi332.eng.ohio-state.edu
> ><gmecm at efi332.eng.ohio-state.edu>
> >> Date: Sunday, June 20, 1999 6:29 PM
> >> Subject: MAF & base fuel tables
> >>
> >>
> >> >Bruce, thanks again for the acyc.bin from your '87 IROC. I have
> >become
> >VERY
> >> >fluent in promedit. What I have discovered is that my memcal apyp
> >(89
> >> vette)
> >> >has no base fuel table. Really, I am sure (as sure as a novice can
> >be).
> >I
> >> >would like to know what type of MAF your IROC has. My vette has a
> >Bosch
> >> >analog hot wire (more voltage output more air)but gm has there own,
> >Delco
> >I
> >> >& II, and they have used a Hitachi. Both the Delco and the Hitachi
> >have
> >a
> >> >frequency output (the higher the frequency, greater the count, the
> >more
> >> >air). The '86 disassembly from ecmguy (what a godsend) would
> >accommodate
> >a
> >> >frequency based MAF (although the MAf tables appear to be in
> >volts!?). I
> >am
> >>
> >>
> >> I have asked this question before - I was going to try using a
> >new-style
> >> "high flow" MAF (they are frequency type). But, as with ALOT of
> >other
> >> projects, I have  put it on the back burner. If you find out about
> >using
> >a
> >> frequency-type in an analog setup, PLEASE let me know. I suspect
> >that all
> >> you have to do is change the bit at 014, but very seldom is anything
> >that
> >> simple......Good Luck
> >> Jon Fedock
> >>
> >>
> >
> >
> >
> >
> >
> >_______________________________________________________
> >Get your free, private email at http://mail.excite.com/
> >
>
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