[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: High Flow MAF revisited - (Porsche 928 voltage MAF)



I have a air flow converter on my project list.
Would accept voltage and output frequency or voltage using a NVRAM table.
 Alex
----- Original Message -----
From: Bruce Plecan <nacelp@bright.net>
To: <gmecm@efi332.eng.ohio-state.edu>
Sent: Sunday, January 16, 2000 7:27 AM
Subject: Re: High Flow MAF revisited - (Porsche 928 voltage MAF)


> Either sensor has the common trait, of not being linear.  Look at K
Kelly's
> chart.
> There ain't no way some simple little V/F or F/V or combination there of
is
> going to do what you want, acurately.  One other option, rewrite the code,
> ya right, like that is easy.  Or use a Microprocessor, and do it right..
> If some one who is really good with code had enough info., that would be
> doable (and with a tad more work we could have a MAP to MAF or MAF to MAP)
> converter.  Now, the last option would be clever, IMHO.
>   Grumpy
>
>
>
> | I'm just nuts enough to be game, but I'm not sold on the reliability of
a
> | Bosch sensor... I'd much rather have a
> | LT1/LS1 style MAF- seem to be more reliable, and cheaper...
> | Like ya said, $300 is a lotta clams for a USED part that would probably
> | work, but ya never know...
> | I want to do something, but I have lots of time- car will not be on the
> road
> | until march/April at the earliest though... Just bought SuperRam, BBK
TB,
> | Flowmaster exhaust, and will be buying AFR 190's, a ZZ4 cam, and SLP
1.75
> SS
> | headers for it...
> | BTW, looked at the Ideas for Design F/V circuit,but I'm no EE- does
anyone
> | have a circuit that would take 1250-11216 Hz, and turn it into 0-5v?
> | Tom
> |
> | ----- Original Message -----
> | From: "Davis" <davis@mail.eecis.udel.edu>
> | To: <gmecm@efi332.eng.ohio-state.edu>
> | Sent: Saturday, January 15, 2000 10:47 PM
> | Subject: High Flow MAF revisited - (Porsche 928 voltage MAF)
> |
> |
> | > I've spent a few hours going thru the archives on this again.. (I know
> | about the
> | > '730, the translators,  and the MAPvsMAF wars, not looking to start up
> | those
> | > again..)
> | >
> | > I found a Porsche site on the net that sells the {new,used,referb}
> Bosche
> | LH
> | > MAFs
> | > and I'm interested..From my archive anthropology I guesstimate the
flow
> | capacity
> | > of the Porsche units to be about 1500 cfm (89mm) {500g/s).
> | >
> | > I'm curious if the maf still reads 0V-5V, if the connector is the
same,
> | how
> | > low-flow/normal drivability will work out?
> | >
> | > Is anyone interested in being a test-subject?
> | >
> |
http://www.mailordercentral.com/928intl/products.asp?dept=135&pagenumber=3
> | >
> | > I wouldn't mind doing it myself, but would have a hard time eating
$300
> | should
> | > the project fail.  I would even contribute to a "test fund"  for
someone
> | to get
> | > one and try it out, to spread the potential liability out a bit..
> | >
> | > TIA
> | > mike
> | >
> | > http://www.eecis.udel.edu/~davis/z28
> | >
> | >
> |
>