Adjusting the Noise
The unique patented venting bias adjustment feature
on the GFB Respons lets you vary the amount of air
vented to atmosphere or recirc, thereby changing the
volume of the sound.
Turning the venting bias adjuster (figure 3) fully anti-
clockwise means all the air will vent through the
trumpet, which is the loudest setting.
Turning the adjuster clockwise from this position will
begin to open up more of the recirc outlet, until a
ratio of 50/50 is reached. As you turn the adjuster further clockwise, the recirc port is fully open
and the trumpet port will begin to close. When the adjuster reaches the maximum clockwise
position, the trumpet is completely closed, and the valve will operate like a factory recirculating
bypass valve.
Typically, most engines will allow 100% atmosphere venting with no problems, provided the spring
pre-load is adjusted correctly. However, some combinations of modifications can result in
backfiring when the valve vents to atmosphere, in which case the solution is simply to dial back the
amount of air vented to atmosphere until the problem is resolved – this is one of the key benefits of
the venting bias adjustment feature.
Do not be afraid to experiment with the spring and noise settings, no harm will come to the engine
if wrong setting is used.
Maintenance
GFB blow-off valves are designed to be as maintenance-free as possible. In most cars the small
amount of crankcase and rocker-cover oil vapor that is directed into the intake system is enough to
keep the piston well lubricated. However, if you notice the sound of the valve changing over time
(e.g. slow response time, intermittent operation), or if you can see that the piston is not moving
smoothly, it may require a clean and re-lube.
Put a rag under the valve to catch any parts that may drop, or better yet, remove the Respons from
the car entirely. Remove the four screws holding on the cap, taking care as the spring will try to
push the cap off as the last screw is removed. Remove the spring and the brass piston, and wipe any
grime from the inside of the valve and the piston with a rag. Apply normal engine oil to the piston
and the inside of the bore, and re-assemble.
Technical Support
If you experience any issues during installation or use of your GFB Respons that are not answered
in these instructions, please contact the GFB tech support team on +612 9534 0099, or email
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.
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.
GFB recommends that only qualified motor engineers fit this product. 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.
(4 pages)
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