GM '89 Bosch MAF - was RE: MAF & base fuel tables

[Ward]

Your both correct to a point, the resolution of an analog MAF is a problem.
255/5 ends up with 21 grams/volt, not to hot !

The later (96 on) 400 gram/sec MAF's are FM and have an output that is 2000
HZ to 12000 Hz, a lot beter ?

I don't understand the UEGO statment though, the standard o2 sensor woke
very well for you application, generaly most of these engine reach amax HP
arround 13:1 AFR or about 850 mvdc.

Ward

On Sat, 26 Jun 1999 22:38:40 -0700, Mark Romans wrote:

> Hi Jason;  The problem is the computer can't read higher than 0 - 255.
If
> you get a maf sensor that reads more you will have to re-do the whole
> calibration scale.  I have not actually looked at one, but I hear that a
> Porsche 928 maf is larger and will physically bolt on.  You might be able
to
> use one (It's still a bosch unti) and then recal the mapping.
> 
> What are you trying to do?  The stock maf maxes out 1) in reading 255
> grams/sec on my 355 at about 4600 to 4700 rpm's. But will flow 589.9 cfm
at
> 11" on a superflow 600.  Calculated to 796 cfm at 28".   On a friends
dyno
> it took 604 cfm to make 406 hp! (Flywheel).
> 
> I just add fuel to the map based on rpm when in pe and watch the 02
sensor
> to make sure it doesn't go lean.  I wish I had a UEGO!!! to really tune
it!
> Listening GAR!
> Mark
> -----Original Message-----
> From: Jason Haines <jhaines at lingenfelter.com>
> To: gmecm at efi332.eng.ohio-state.edu <gmecm at efi332.eng.ohio-state.edu>
> Cc: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
> Date: Saturday, June 26, 1999 10:47 AM
> Subject: GM '89 Bosch MAF - was RE: MAF & base fuel tables
> 
> 
> >
> >
> >Does anyone know of a mass air flow sensor (MAF) that has higher flow
than
> >the 1989 GM Corvette Bosch MAF that also gives a 0 to 5 volt output like
> >the Bosch sensor does? Something that gives higher than 255 g/s at 5.0
> >volts (double would be nice). Some European car has to use a Bosch
sensor
> >and make over roughly 350 hp with just one sensor (I see a lot of the
newer
> >high output cars are using two sensors). I have been trying to use a
> >frequency type with a frequency to voltage converter but it is not
working
> >very well and I would rather just put another voltage based MAF in and
> >figure out the airflow versus voltage table for the new sensor. I have
even
> >tried using a "drop" in Ford MAF from Best Products that is supposed to
> >replace the GM Bosch sensor but that has not been working very well
either
> >so far.
> >
> >Thanks,
> >
> >
> >Jason
> >
> >
> 





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