my stage3 cossie running 25psi and now its just dropped down to 14psi and wont go above

 

First thing that comes to mind is the amalvalve not working anymore. If that's the cause then it wont be bleeding any air out to the airfilterbox but will send all the boost directly to the actuator causing it to open much earlier. So less boost.

 

Could be loads of things Daz,

Amal valve, weak actuator etc

 

hi james ,i thought amal valve but wasnt sure

 

it's got a big air leak!!!! d/v a good starting point if ones fitted!!

 

Yeah diaphram can go in dv

 

amal, actuator and check for air leaks are first and foremost to check.

 

DV easy to check, stick a round bit of wood in place of it and try it.
tabetha

 

cheers tabetha, will try the DV i may take it apart as a spec r one and only 3 bolts .

thanks

 

Only this week, well yesterday fitted my new Collins diaphragm in my dv, old one kept sticking and all sorts.
It was acting a bit odd to start with, a bit lazy, but noticed it was not super flexible like the old one, which was now torn, and very mishapen.
After around 10 miles all good, hadn't realised it must have been leaking boost all the time, as it's defo pulling harder lower down from 1800rpm, and noticebaly faster all the way, one of those things that happens so slowly it doesn't get noticed, it laso idles better now, even with ignition smoothing off!!
Good luck with the boost hunt anyway,
tabetha