[Diy_efi] 555 Timer controlled EFI

[Geoff Harrison]

Scotty, you are correct with the freq to voltage conversion. I 
saw TTL somewhere.
With the GM MAP sensor, you get a variable resistance which is 
easy to convert to variable voltage, and feed that to the 
modulation pin on the 555.
Also, I don't like any restriction the manifold, (except a 
throttle plate). So, if I had to use a MAF, I would go to the 
hot wire type, but those too have their problems.

Having said that, one beauty of this approach, is it can be easy 
to set it up to suit your requirements.

Cheers,
Geoff H
----- Original Message ----- 
From: <ScottyGrover at aol.com>
To: <diy_efi at diy-efi.org>
Sent: Saturday, January 21, 2006 11:33 AM
Subject: Re: [Diy_efi] 555 Timer controlled EFI


>
> In a message dated 1/20/06 4:20:50 P.M. Pacific Standard Time,
> geoff_h at smartchat.net.au writes:
>
> 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
>
>
>
> You wouldn't need a D/A converter; a Frequency-to-voltage 
> converter should
> do the job.
> Scotty
>


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