[Diy_efi] Sequential fire setup

[Dave Dahlgren]

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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