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

[Mark Romans]

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
>
>