GFB Turbo Fuse (part 8001) - Manual (Page 2)

1. Set the Turbo Fuse to the lowest setting by loosening the lock nut, and then wind the screw anti-clockwise
a few turns. Now turn it slowly clockwise until you feel it engage the spring (the resistance will increase).
2.
Use the following formula to determine an approximate initial setting:
Number of turns = (target boost – 10) / 1.5
Turn the adjusting screw clockwise by the number of turns calculated above.
3. Road-test the car. You need to make sure you hit the peak boost, which is best done in as high a gear as
practical, starting from just below the turbo spool-up RPM and continuing at full throttle to the
approximate peak torque RPM (between 3000-5000RPM for most cars). If the device triggers, increase
the setting one turn at a time until it no longer triggers. Conversely if it does not trigger, reduce the setting
until it does, then increase it one turn at a time until it stops triggering.
At this point you can choose how much headroom you will allow. If you leave the setting where it is after step 3, this
means the Turbo Fuse is triggering about 1psi (or less) above the peak boost. It is possible that on this setting you
might find the device triggers occasionally, as boost levels in most cars will vary by a small amount (some small boost
spikes can occur so rapidly that most gauges will not show them).
Increasing the headroom will prevent the device from triggering unexpectedly, but will still protect against sudden and
large over-boost occurrences. Each additional clockwise turn of adjustment will increase the headroom by about 1psi,
which will tolerate small spikes that can sometimes occur.
Maintenance
The Turbo Fuse is a device that, in an ideal world, will never be triggered. Of course, if it does trigger then it has very
likely prevented damage to your engine. However, as it will remain idle for much of its life, GFB recommends that you
periodically activate the Turbo Fuse manually to ensure proper function of the mechanism. This procedure is common
to many similar devices, such as the pressure relief valve found on all household hot water services, or even industrial
pneumatic valves that do not operate often.
To activate the Turbo Fuse, insert the supplied hex key (or any suitably slim object) into the hole on the underside of the
Turbo Fuse body and push the valve open a couple of times. It should push up easily and then spring closed when you
remove the hex key. GFB recommends that this should be done every month or so if the Turbo Fuse does not trigger
when driving.
This product is intended for racing use only, and it is the owner’s responsibility to be aware of the legalities of
fitting this product in his or her state/territory regarding noise, emissions and vehicle modifications.
This product may not work if installed correctly, and as such GFB makes no warranty against engine failure
when using this device.
GFB products are engineered for best performance, however incorrect use or modification of factory systems
may cause damage to or reduce the longevity of the engine/drive train components.
Warranty is for the period of one year from the date of purchase and is limited only to the repair or replacement
of GFB products provided they are used as intended and in accordance with all appropriate warnings and
limitations. No other warranty is expressed or implied.