*****SUSPECTED SPAM***** RE: [Diy_efi] RE: Diy_efi Digest,Vol 11, Issue 6

[Geoff Harrison]

Jeff, The MAP sensor output, or any other sensor output, needs 
to be "conditioned" and fed to the modulation input of the 555 
(pin 5) This will vary the pulse width. If the 555 is triggered 
by the ign pulse, the RPM will take care of itself - the 555 
needs to be run in the monoshot mode, not free running.

Geoff

----- Original Message ----- 
From: "jeff matthews" <maple69vt at hotmail.com>
To: <diy_efi at diy-efi.org>
Sent: Tuesday, January 17, 2006 1:39 AM
Subject: *****SUSPECTED SPAM***** RE: [Diy_efi] RE: Diy_efi 
Digest,Vol 11, Issue 6


>
> I played with a timer 555 and injector last year, I used both 
> a darlington and mosfet transistor, can't recall off hand 
> which one I ended up with.
>
> Being able to vary the pulse width via MAP (and RPM would be 
> ideal) but just being able to vary by MAP would work for my 
> application, But how would one connect this?
>
> The timer is allready switched on/off via a comp circuit and 
> map sensor (2.5 bar) triggered to come on @ V which I can 
> adjust via a Pot.
>
>
>
>
> Best regards,
> JEFF
>
> ------------------------------------------------------------------------------
>
>  From:  "John Smith" <dirtrider218 at hotmail.com>
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>  Subject:  [Diy_efi] RE: Diy_efi Digest, Vol 11, Issue 6
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>
>  Really? That would be great! I just put together a 555 
> monostable with a TIP3055 transistor on the output and it 
> triggers an injector just fine with only a 9v battery. I'm 
> looking to either use a manifold pressure or mass airflow 
> sensor to control the width. I already have the mass air...
>
>  >From: "Geoff Harrison" <geoff_h at smartchat.net.au>
>  >Subject: Re: [Diy_efi] RE: Simple EFI, where is it?
>  >To: <diy_efi at diy-efi.org>
>
>  >John,
>  >I had a look at using a 555 timer some time ago. My ideas 
> were
>  >for a multi cyl, using GM sensors. And an o2 sensor to 
> provide
>  >feed back to close the loop.
>  >If your still interested I could email block diagrams etc. I
>  >must stress however, the ideas have
>  >not been put into practise yet.
>  >
>  >Geoff
>
>
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