sorry to interrupt but i someone told me that if u change the spring of the bov then u can use it(Greedy type r) for low boost is it true?
when u buy greddy type-r , there are two options
stiffer spring or normal spring
if u buy the normal spring, u should be fine :)
Bump:
I guess my mechanic anticipated me to drop in a pair of GT30's, or single GT40's but it didn't materialize ... Rather kept to the modest hp's for driveability
The again, the Type-R (at that time) was so far the recommended in term of durability compared to others ...
Yup, that's what I did .... Maybe I should crank it to 1.1 - 1.3 bar instead
By the way, that was a good "karangan" about the Synapse bov ... although abit conflicting on the last paragraph ... No doubt, excellent ...
i guess u mean this , no problem can discuss :D
but ahaks , there is an alternative way for the greddy bov , you may tune or help the bov to open up at low boost , that is by fitting a BOOST source from intercooler piping to the down nipple of the greddy BOV. But then again, the BOV easily leaks when u run high boost cos the down nipples makes the valve to open up more easily. The down nipple is recommended more to cars that run very low boost and is unable to open the bov even after loosening the spring tension.
from wht we discussed in dsmtalk.com
from this picture of the greddy design
http://img508.imageshack.us/img508/3555/70369520.jpg
A&B comes from the same source which is the intercooler pipe
C is a vacuum source which happens to be after TB
A pushes the valve below
C pushes the valve down + spring to push it tighter
wht happens when u play only low boost is that the spring tension is too stiff that
it does not open fast enuff when throthle is released (when C source becomes vacuum)
thus cousing compressor surge
when u start supplying boost source B to the intercooler pipe , this helps pushing the valve up
as u release the throthle, port C becomes vacuum , port A & C still has boost pressure pushing up the valve to open
one theory that was explained in dsmtalk , argh i cant find the link
although with port
A,B and C used , u now can open up the bov easily at low boost
but it doesnt hold shut at high boost , why ? this is the reason
the amount of pressure at the hose could be the same, is the amount of surface the pressure is against on the same ? need an example eh
ok here it goes , assume the flat piece is the top diagfram
_____________________________
-------------|ooooo|--------------
-------------|ooooo|--------------
_____________________________
-------------|oo|--------------
-------------|oo|--------------
both has the same amount of surface , but the hose below is the air pressure supplied
which one will hold more , of cos the one with more surface will hold more right ? although both has same amount of boost
thts the top diagfram, same goes with he valve below , should understand that the top nipple is supplied with just 6mm hose with pressure to the diagfram while the pressure that is pushing the valve below has a constant supply of pressure to a 40mm surface + the port B is also supplied with boost pressure with a 6mm hose to push the valve open, ahak so this wht causes the leak
the higher u boost the more it will leak unless u have more and more stiffer springs
if not , why should 1bar and 10bar make diffrence :D
