FUEL VOLUME & PRESSURE
To some degree related, volume of flow and pressure are
important factors in peak power with out detonation, the killer of high
compression, or high boost engines. Every time your pistons compress the
FUEL/AIR mixture on the upwards compression stroke (ok, Subaru/Porscheand
Mazda Rotary owners you know what I mean!) the AF ratio must be right to
promote combustion of the mixture in an even and constantly progressive
manner. We wont get into exact technical terms and descriptions here .
Suffice to say that if the mixture is LEAN (more air than fuel at the
correct ratio) the chances of detonation are increased dramatically due to
much higher temperatures of combustion and speed of flame front.
This means that we need the right amount of fuel to be delivered to the
combustion chamber considering the amount of air under boost and its
volume and temperature. As you can see all these things are interrelated
and are managed by your computer and sensors in the case of fuel injected
cars, and in the others running carburettors, good luck! (Sorry about
that.) What I am trying to get at here is the fact that fuel delivery is
most important and if you want more power out of your standard turbo car
you have to address the issue of ensuring enough fuel for the mixture.
Most turbo cars management systems will deliver correct mixtures up to the
factory set boost limit and beyond to a few pounds more but must be helped
in some way if serious boost ( 14.7 PSI / 1 BAR ) and more is needed. With
the previous information in mind it is a good idea to check and possibly
replace some components of your fuel system for optimum operation. As an
example here I will detail some things I have done on my Starion but apply
to most turbos with Electronic Fuel Injection. -
Replaced conical strainer in entry to rear fuel pump on top of tank,
-Replaced pump with higher flow unit ( VL Turbo Commodore), -Replaced fuel
filter larger flow unit, -Replaced boost air sensor line from throttle
body to fuel pressure regulating canister (most important - more boost
needs more fuel to keep the fuel / air mixture right!!)
Detonation is to be avoided at
any cost.
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Warning, the All TURBO CLUB Register makes this information available to you with
NO express guarantee's implied or otherwise on the suitability of the information being
relevent to your Automobile Make or Model. You should not make any modifications to your
Automobile unless a qualified Mechanic has approved and checked that the vehicle is safe
and roadworthy and meets all relevent State Governed Regulations before proceeding onto
public roads. The information contained in this ATCR Website is believed to be correct but
the Author and Publisher make no warranties, express or implied that the information is
free of errors, or that it will meet the particular requirements of individual Automotive
application.
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