just purchased a DV12 Bailey Dump valve, (VTA) looks like its going back on fleabay, many don't favour this type of valve, as it will probably suffer drivability problems relating to juddering on fast gear changes and shuddering when easing off the throttle from low boost.
VTA bov literally dumps air that's already been measured out of the system after the ecu has determined the amount of fuel to use so it runs the engine instantaneously rich.

 

Sorry ,but with the statement that you have made above,which is true by the way,makes me ask the question : why the HELL did you buy it in the 1st place

 

cos I work backwards. I buy things and then research after.

on the other hand, it may be fine, so will see what happens when its fitted.

 

Hmmmmmmmm

 

We have all did that at some stage

 

thanks, lets see how things develop, won't be getting rid of stock valve, will have that on stand by if need be.
Bob Rawle did an absolute fine job when he mapped it back in January, it pulls like a train to red line, the guys a genius, knows the Scooby inside out.

 

+1 for the above & a nice bloke too, I was with him 4 weeks ago & mapped my uk turbo to 330 lb/ft. Taking my mates wrx to him on the 15th to map a simtek , hopefully for more of the same.

 

there are so many mappers up and down the country, but with Bob Rawle, you can be rest assured, your in safe hands, his vast experience and knowledge, is worth every penny spent on mapping.
the number of parameters he can modify is quite staggering to say the least.

Bob's own STi is having a major overhaul at Litchfield in Tewkesbury, that car is going to reach some serious power once all the big work has been completed.