[Diy_efi] Sequential fire setup

[Bruce]

Where do you normally monitor air temp.?
Bruce


----- Original Message -----
From: "Dave Dahlgren" <ddahlgren at snet.net>
To: <diy_efi at diy-efi.org>
Sent: Monday, August 05, 2002 4:14 PM
Subject: Re: [Diy_efi] Sequential fire setup


> An air entry box for outside air is always a good idea as long as the
associated
> drag does not cost more power than the air box will make. I have always
heard
> the deal about 1% more density for 7 degree F changes but have not found
it
> quite that good so what i do  is use around 5 degree f for a 1% in the
fuel maps
> and actually start adding fuel back in as it goes over 135 degrees F on a
race
> car with fresh air intake.
>
> The injector location stuff has always worked from from SBC to BBC to
Cosworth
> and Ferrari.. I have no clue why it would not work other than a rather
poor
> entrance angle. I did on set of stacks at a 45 degree angle and man was
that a
> nightmare compared to 30 degrees..
> Dave
>
> William Shurvinton wrote:
> >
> > If I could post a couple of extra questions here.
> >
> > ----- Original Message -----
> > From: Dave Dahlgren <ddahlgren at snet.net>
> > >. Plenums are for carbs you don't need one for a race
> > > engine and EFI.
> >
> > Is this really the case for a 'high speed' application like this. I
would
> > have though, with this HP the velocities reached would be such that an
> > airbox of some sort would add at least 20-30HP. Not many % but every bit
> > helps. (not a plenum in the generally accepted sense of a throttled
volume)
> >
> > > The trade from highest to lowest positions is about 10% in torque with
the
> > high one being the
> > > winner. In the WSC/ALM/Petit Le mans  cars we have the injectors out
of
> > the
> > > stacks completly hanging on a rail that sprays the fuel into the
stacks.
> >
> > Is there accepted wisdom when this works? It gets tried quite a lot in
> > clubman classes, with varied results from no improvement to improvement
from
> > 5500-7000 but no increase in peak power, to an improvement across the
band.
> > More often that not it gets done because people buy tapered throttle
bodies
> > and forget to specify dual injector locations. Then as the thirst for
power
> > hits then they need to find additional injector locations. All the stuff
I
> > have read here in UK is purely empirical, as the F1 boys are too coy to
> > publish the interesting stuff to plebs.
> >
> > Rgds
> >
> > Bill
> >
> > _______________________________________________
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>
>
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