MAF & base fuel tables

[Knowlden and/or Eller]

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
>>
>>
>
>
>
>
>
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