[Diy_efi] Sequential fire setup

[Dave Dahlgren]

Generally right next to the sensor...
Dave ( and yes it is my turn to be an asshole)

Bruce wrote:
> 
> 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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