[Diy_efi] 555 Timer controlled EFI

[Geoff Harrison]

Having a linear output is great, but my concept was to avoid the 
added complexities i.e. in this case a D/A converter. The main 
concept was to have a system that was easily adaptable to almost 
any engine, and tune it on the road by a co-driver. I know  this 
can be done with newer systems, with the aid of a hand piece or 
laptop but then the co-driver has to know how to go about it.

Geoff Harrison

----- Original Message ----- 
From: "Tom Visel" <five10man at commspeed.net>
To: <diy_efi at diy-efi.org>
Sent: Saturday, January 21, 2006 2:45 AM
Subject: Re: [Diy_efi] 555 Timer controlled EFI, summary of off 
listmessages - long


They come in different handy sizes, too - with half the sensor's 
airflow
blocked off on a small 4-banger, for instance.

TheEthereal at gmx.net wrote:

>Hey guys,
>
>Mitsubishi MAFs put out a TTL level frequency that is dependant 
>on air mass
>drawn through the MAF. It's almost completely linear, meaning 
>twice the load
>or twice the revs and the frequency will double, too. I think 
>that will make
>things easier than using a MAP sensor. But bear in mind that 
>those MAFs pose
>a restriction to the engine's intake and you cannot use 
>Mitsubishi's MAFs in
>a blow-through setup because of their construction 
>(Karmann-vortex). OTOH,
>you can easily monitor the amount of air going through the 
>engine because
>the frequencies of the MAF are audible, approximately 25-40 Hz 
>at idle and
>up to 2500 Hz or even more under very high boost at WOT and 
>umpteenth revs.
>
>
>>--- Urspr?ngliche Nachricht ---
>>Von: "jeff matthews" <maple69vt at hotmail.com>
>>An: diy_efi at diy-efi.org
>>Betreff: RE: [Diy_efi] 555 Timer controlled EFI, summary of 
>>off list
>>messages - long
>>Datum: Fri, 20 Jan 2006 08:18:48 -0500
>>