Re: 16bit MAF xfer function in '165

[romans@starstream.net (Romans, Mark)]

Hi Nick:  What have to done to your engine to make it read 255 grams/sec at
4000 rpms?  I have ported my maf and removed the heat sinks and it reads 255
at about 4700 rpm's.  When the engine was stock it would never go over about
208 grams/sec period.  I now have a 355 cu in engine.  I have raised my fuel
pressure to 50 lbs at idle with the vacuum hose disconnected.  My Block
learn seems to be staying right around 128.  I had to adjust the flow in the
maf tables below 15 grams sec to get the bl back in line.
I think if you just made the existing maf flow more and adjusted the spark
and fuel to match up I just think you will lose some resolution.
Mark
----- Original Message -----
From: "Peter Gargano" <peter@ntserver.techedge.com.au>
To: <gmecm@diy-efi.org>
Sent: Saturday, May 06, 2000 7:21 PM
Subject: Re: 16bit MAF xfer function in '165


> NickG wrote:
> >
> > Has anybody modified the code in a '165 ECM to use a 16bit MAF xfer
> > function?
>
> I haven't, but I may be interested in what you're doing. What code base
> (BCC, or ID byte, etc.) are we talking about?
>
> > Currently, the stock MAF on the car maxes out at around 4000rpm.
> > I'd like to install a unit that can measure up to 512gms/sec (@ 5v), but
> > it'll require 16bits per entry in the transfer function in the ECM . Any
> > ideas?
>
> So, are you saying you have a MAF that gives a reading better than 8 bit
> of resolution? Or are you just asking about scaling the reading from a new
> MAF sensor, that gives a lower voltage than the existing MAF at the same
> flow rate, to use the existing tables?
>
> Have you thought of going MAP?
>
> Peter
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