GFB Turbo Fuse (part 8001) - Manual

GFB Turbo Fuse
The GFB Turbo Fuse is designed as a protection against accidental over-boosting in turbo-charged vehicles, which it
does in conjunction with the car’s existing blow-off/bypass valve.
IMPORTANT – PLEASE READ! For the Turbo Fuse to work correctly your car MUST be fitted with a blow-off or
bypass valve, and that valve MUST be of the type that will open under boost if the its vacuum hose is removed. Most
factory and aftermarket valves are of this type; the common exception is the HKS Super Sequential (and all copied
products), and any valve that has been reversed in an attempt to hold boost better (this is a common trick with factory
valves on Mitsubishi EVOs). The simple way to test your valve is to remove and plug the vacuum hose; then drive the
car. If the valve opens when you accelerate and boost is lower than normal, then it is suitable.
The ability of the system to lower the boost level when the Turbo Fuse is triggered is dependant on the flow capacity of
the blow-off valve it is connected to, although most valves will drop the boost enough for the purpose of engine
protection. It does not matter if the valve is recirculated or vented to the atmosphere, but atmosphere-venting valves, as
an additional benefit, will give an audible indication that the device has been tripped.
Installation
1. Locate the blow-off/bypass valve vacuum hose, and trace it from one end to the other. It should connect
to the intake manifold at one end and the BOV at the other. If there are any other devices teed into this
hose (boost gauge for example), the Turbo Fuse should be connected between the BOV and the tee join;
otherwise the connected device will stop functioning if the Turbo Fuse is triggered.
2.
Select a suitable position on the vacuum hose to connect the Turbo Fuse that is protected from direct
exposure to the elements or extreme heat from the exhaust.
3. Simply cut the vacuum hose in the selected location and insert the Turbo Fuse to re-join the hose. The
hose from the manifold goes to the nipple on the Turbo Fuse marked “manifold”, and the hose to the
blow-off valve goes to the nipple marked “BOV”.
4. It is strongly recommended that you cable-tie either the Turbo Fuse, or the hoses immediately either side
of it to something solid to prevent the Turbo Fuse from moving around in the engine bay or knocking
against something.
Setting up the Turbo Fuse
The trip-point of the Turbo Fuse is adjusted by the screw on the top. Clockwise increases the boost at which it will
trigger, and anti-clockwise reduces it.
The lowest setting that the Turbo Fuse will trigger at is around 10psi (0.68 bar). Turning the adjusting screw will alter
the trip-point approximately 1psi for each full turn, although this should not be relied upon to set it up.
You now need to decide where to set the actual trip-point. The most common method is to set it so it will trigger about
2-3psi higher than the peak boost the car is set up to run, although you may decide to make it more or less, depending
on your engine.
If you have a boost gauge on your car, and you know what boost pressure you want the Turbo Fuse to trigger at, use the
procedure below from step 1.
If you do not have a boost gauge and/or do not know how much boost your car runs or what setting you want to set it to,
follow the procedure below, ignoring step 2: