Custom MAF system: help w/ calculations

[Pat Ford]

?? isn't VE the measure of actual airflow ( which is also what the maf does)?  

Previously, you (John Dammeyer) wrote:
{ Hi,
{ 
{ My guess is the MAF systems still use some sort of Volumetric Efficiency
{ table or else you could use a percentage of intake valve open time since you
{ already have the flow rate.  If you work it backwards you can see that
{ sampling the MAF rapidly over the period of time that the intake is open
{ will give you a series of mass air readings that summed probably come close
{ to the mass of air in the cylinder.

 I think that the mafs are slow reading so they tend to average the airflow over  time. 

{ 
{ Cheers,
{ 
{ John
{ 
{ ----- Original Message -----
{ From: <james.drysdale at utoronto.ca>
{ To: <diy_efi at diy-efi.org>
{ Sent: Tuesday, January 23, 2001 5:14 PM
{ Subject: Re: Custom MAF system: help w/ calculations
{ 
{ 
{ >
{ > > Good luck with your endeavor.  Welcome here.  I won't say much about
{ > > UofT, other than to say I hail from Queen's, 'nuff said :)......
{ >
{ > Queens...was my second choice. Really. :)

 bad choice Queens rules!!



--
Pat Ford                           email: pford at qnx.com
QNX Software Systems, Ltd.           WWW: http://www.qnx.com
(613) 591-0931      (voice)         mail: 175 Terence Matthews          
(613) 591-3579      (fax)                 Kanata, Ontario, Canada K2M 1W8

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