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Midnight Express
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Fuel Setup
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The overall goal for the fuel set-up was to create both
a functional and capable system that also looked the goods within the boot.
Although we could have mounted the fuel pump outside of the car to reduce
noise and smell, it was decided to keep it in the boot to minimise any
damage to fuel lines from the constant bumps of street driving. To ensure
that fuel vapour would not be leaked into the cabin, Earls Teflon (Speed-Flex)
Hose and appropriate fittings will be used throughout, and a clear perspex
enclosure will ensure as much noise and any possible leaks stay contained.
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Working out injector size to support your RWkW Goal
Injector Size (cc) = A / (B x C x D)
A = Projected RWkW Figure
B = 0.8 (80% of Maximum Duty Cycle)
C = 0.85 (Typical 85% of flywheel power is transferred to the wheels)
D = 0.746 (Convert HP to RWKw)
- Injector Size (cc) = 350 / (0.8 x 0.85 x 0.746)
- Injector Size (cc) = 350 / 0.507
- Injector Size (cc) = 690.335
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Injector Size (cc) ≈ 720 (Always round up to next size available)
Note: This calculation only works for Unleaded Fuel, if you are planning
to run E85 you should factor in around 30% increase in flow.
The first step was to sit down and design how the fuel system will
work. This may take a while if you are trying to run a complicated setup or
want to factor in future power upgrades. Below is what we came up with.
From here you can also start to plan what sort of fittings you will need
and the desired quantity. Although screw on fittings are not needed, we
always approach by the addage of doing a job properly will save you both
time and hassles in the long run. |
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| The boot was stripped bare for work to begin |
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Once the boot was stripped, we set about calculating all the different Fittings and
Brackets required. We also decided to go for a Bosch 044 (700hp, 5Bar)
External Fuel Pump due to its reliability, along with a 1.5L Surge tank to
ensure no fuel starvation problems occur during hard cornering.
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| Earls Fittings and Surge Tank dummy fitted to check clearances |
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Now that we have an idea of where everything will sit, we set about cutting the braided hose to the required length.
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| Hose Ends fitted, Fuel Sender lid with Rubber Seals and Fuel Hard Lines |
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Once all the fittings are attached to the lines,
came the job of cutting the fuel sender metal plate to allow the lines to
run from the lift pump to surge tank, and return from surge tank to the
tank. we also had to join the braided lines to the hard lines that run
underneath the car with a conventional style worm clamp.
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