My mate recently got me a baileys dv. Put it on and it sounds ok, but anything higher than 2-3 psi it sounds abit mad when it dumps.? Like a high pitch sound similar to chatter? Its a baileys dv 24

 

Don't you need dv26 twin piston one

 

Dv24 is a single piston suitable for fiesta rst's and all cars without an airflow meter, the dv26's were suitable for escort rst's and all cars with an airflow meter. so m8 you need the dv26 as it wont idle properly with a dv24

 

Or just block the return on the metering unit and breathe to atmosphere (which I would recommend anyway).

 

I have the fiesta rst engine in my car so it should be ok? It just dosent sound like the one i took off did and i thing that was a double??

 

I was looking in to this aswell the Chap is rite dv26 won't idle properly