I'll be running the follwoing spec Engine and wonder if anyone can advise which would be a good Dump Valve to use - GGR, Bailey etc.

RS500 Block Long Studded
Polished Head
14 Inlet Cam - 10 Exhuast Cam (Mountune Spec)
GRP A Pistons
H-Beam Steel Rods
Balanced Crank
T34 .63
Siemen 55lb
-31 Actuator
Coil Pack etc on M.D. Chipped P8

Many thanks

 

the T34 doesn't need a dump valve to be fitted

 

Although it doesn't have to have one fitted, it makes a hell of a difference if it has one, I disconnect mine occasionally for the chatter that me lad likes, so much slower in the gears.
I use a Colins group a one, a diaphragm one, as these seem to be louder, so I drilled mine out to be as loud as possible as well!!
tabetha

 

Thanks for the replies Gents...........

The reason I was asking is I thought it kept the Turbo spinning at higher revs by relieving the back pressure to the turbo when you're off the throttle between gear changes.

I also thought this could prolong the life of the turbo "a little" with a little whooosh as a bonus

 

It does release built pressure and so aid in re-spool so reducing lag, this is why I run with one.
tabetha

 

any they all do the same release air pressure on let off so it dosent go back to the turbo and stall the compressor wheel more of a thing with high boost levels! but wont hurt on any if u can put up with the noise lol

 

I thought I would get fed up of the noise, but I haven't, still love it guess I must be a chav at heart!!
tabetha

 

Im lucky mine chatters but then i do run 2.6 bar

 

KOOL how fast is 2.6 bar?

 

I didn't want to chance 2.6 bar on a 200,000K old engine, but once new one is run in after 1000 miles boost back up around 36/38 happy days!!
tabetha

 

very on my gt30