FAQ (Frequently Asked Questions)
Does the Negative Supercharging Kit include the cost of
No......The installation time varies for each vehicle due to the different range of
accessories that may need to be removed and replaced in the engine bay to install the Kit.
What is required to install the Negative Supercharging Kit?
The parts of the Kit are easy to install like conventional bolt on parts, but it is very
important the Impulse cam is installed in the correct position specified on the Negative
Supercharging "Cam Spec Sheet". The Impulse cam is manufactured to correctly
position the valve timing in the engine when the cam is installed at zero degrees which is
when the dots on the cam and crank sprockets are aligned. However, the keyway in the
crankshaft may not be machined in the correct position which will cause the optimum valve
timing of the Impulse cam to be out by up to 6 degrees. This will reduce the supercharging
effect or prevent Negative Supercharging from working. Therefore, we highly recommend that
an authorised installer or a professional engine builder "dial-in" the Impulse
cam to the correct position specified on the Negative Supercharging "Cam Spec
Sheet". Each Negative Supercharging Kit will be supplied with this "Cam Spec
Sheet" and instructions on how to dial-in the Impulse cam.
Does the vehicle require upgrading the drivetrain or brakes
with the Negative Supercharging Kit?
Most vehicles will not need to upgrade the drivetrain or brakes, if the size of the engine
in the vehicle is not larger than originally produced by the manufacturer and the vehicle
is not used for racing or competition purposes. However, the massive torque produced by
Negative Supercharging will increase the stall speed of a standard or hi-performance
torque converter by 1,000 rpm which will over stress and gradually damage the converter.
For this reason, we highly recommend the Negative Supercharging Kits be used with the
Dominator XHD Supercharger Converter which is a full race converter that was specially
developed by Autoflite Engineering P/L to handle the massive low rpm torque produced by
Can the Negative Supercharging Kit be modified with conventional performance
No......Negative Supercharging is a highly advanced process that requires synchronising 8
areas of the engine which control the fluid dynamics for this process to effectively
supercharge the engine. Any modifications to the Negative Supercharging specs or parts
will enterfere with this complex process and reduce power or may damage the engine.
However, some conventional performance parts such as intake manifolds, EFI and ignition
systems which do not modify the specs or parts of the Negative Supercharging Kit may be
Can the standard exhaust system be used with the Negative
Yes......However, to optimise the performance of the Negative Supercharging Kit we
recommend the vehicle use a single or dual free flowing performance exhaust system with
straight through or reverse flowing performance mufflers that are perforated. Do not use
louvered type mufflers, they are very restrictive and will reduce power.
Does Negative Supercharging require a different ignition advance curve with
No......Due to the extremely fast burn produced by Negative Supercharging it requires the
same unique advance curve with liquid fuel as with gas to optimise power.
Can a high compression ratio be used with the Negative Supercharging Kit?
No......Negative Supercharging forces a large volume of air into the cylinders like a
conventional supercharger which will cause pre-ignition (pinging) with a high compression
ratio. For this reason the compression ratio should be kept between 8.5 to 9:1 with
Does the Negative Supercharging Kit shorten the life of the engine?
No......The huge increase in low rpm torque produced by Negative Supercharging makes the
engine live longer because the engine uses low rpm to quickly accelerate the vehicle. This
produces a lot less wear and tear on the engine than using high rpm. A good example is
turbocharged truck engines which produce a huge amount of torque and pull heavy loads
using low rpm yet they live much longer than high rpm car engines.
What type of fuel systems work with the Negative Supercharging Kit?
Negative Supercharging works with all types of fuel systems ranging from carburetors, gas,
TBI to EFI.
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