GFB Respons TMS (part T9007) - Manual (Page 4)

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 anti-
clockwise will open up the trumpet outlet
more, making the valve louder, whilst
clockwise will open up more of the recirc
outlet for quiet operation. Turning the valve
fully clockwise until it stops will close off the
trumpet completely, and the valve will
operate like a factory bypass valve.
Conversely, turning it fully anti-clockwise will
make it vent completely to atmosphere,
which is the loudest setting.
Typically, most un-modified engines will allow 100% atmosphere venting with no problems.
However, some combinations of modifications can result in backfiring if high proportion of
atmosphere venting is used, 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.
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 indefinitely. 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.
Cleaning Procedure: 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.
Venting bias
adjuster
Adjusting the sound
mAINTENANCE
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.