[Diy_efi] Air/Fuel meter now working! And L-jetronic

[Astrona]

Sorry, i was too fast...
> > If added air flow (speed) meter, we could forget
> > these tables :D and put that system onto whatever
> > engine.
> Almost, but not quite, as cylinder filling is not
> always the same as what passes the MAF.

With different cam for example, the same pressure in manifold will end up
different pressure in cylinder. BUT FLOW METER WOULD REGISTER IT.

Trying to be not so off-topic.
Before i got MegaSquirt, i was planning to use parallel vane-type
flow-meters to reduce the restiction.
The point was Double cross-section (25cm2 vs 50cm2) plus the springs of
vanes loosened by half. So half the air that passes a vane would move it as
much as before.
Never heard if anyone done it, but should try ;)





----- Original Message ----- 
From: "Astrona" <amdcpu at hot.ee>
To: <diy_efi at diy-efi.org>
Sent: Friday, June 17, 2005 1:58 AM
Subject: Re: [Diy_efi] Air/Fuel meter now working! And L-jetronic


> ----- Original Message ----- 
> From: "Adam Wade" <espresso_doppio at yahoo.com>
> To: <diy_efi at diy-efi.org>
> Sent: Friday, June 17, 2005 1:34 AM
> Subject: Re: [Diy_efi] Air/Fuel meter now working! And L-jetronic
>
>
> > --- Astrona <amdcpu at hot.ee> wrote:
> > > With NA engine and L-jet we also know only the flow
> > > and not the real density.
> > NA L-Jet applications have an AAP and an AAT sensor
> > (sometimes the AAT sensor is inside the VAF), from
> > which the ECU determines the density of the air.
> Have you seen pressure sensor in L-Jets? I haven't heard!
>
> > > But we can think so: when 0.5L air @2bar abs
> > > pressure moves to cylinder, the same amount of air
> > > needs to go through airflowmeter = 1L @ 1bar. It can
> > > be a bit delayed.
> > That is exactly my point.  Those are the same air
> > MASS, but the former will be seen as being only half
> > the flow by the VAF.  At that point, the mixture would
> > become so lean that I would expect the vehicle to
> > stall, UNLESS there is a way to "inform" the ECU of
> > the density of air in the plenum.
> Why only half???
>
> > > At the same manifold pressure, temperature, throttle
> > > position and RPM - we know the mass if we have
> > > volumetric efficiency table (flow speed).
> > L-Jet (not LH-Jet) has neither any tables (it's an
> > analog ECU), nor has it a manifold pressure sensor
> > (and neither does LH-Jet).  Presumably there are what
> > amount to VE tables for the LH-Jet, as it is a digital
> > ECU, but I have not looked at an EPROM dump from one.
> Although analog ECU's didn't have ROMs, they had maps.
> Mapped by resistors. ;)
>
> > > If added air flow (speed) meter, we could forget
> > > these tables :D and put that system onto whatever
> > > engine.
> > Almost, but not quite, as cylinder filling is not
> > always the same as what passes the MAF.
> Yeah, with different cam for example, the same pressure in manifold will
end
> up different pressure in cylinder.
>
> > > What WBO2-guys mean by AFM?
> > Air-Fuel Meter.
> It's not fear. :)
>
>
>
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