jonezy wrote:Really? The usual one is 3.4" isn't it?
yes.
*nub* wrote:dunno about JRSC but fn2 comptech has a 3.15" which is the limit without a cooler. but the manifold is a bit more efficient, I believe it produces 10 psi. Can get up to 330bhp on that, i've never seen an ep3 JRSC that high
simply don't agree, this is from a an un-cooled JRSC running a 3.2"
this is not a one off, I have seen dozens of them.
Un-Cooled, you cannot run 9-10Psi without getting into det - no this does not mean it's instantly going to fail, but given time, that picture is what your pistons will look like.
with the EP3 style JSRC, anything less than the 3.4" is asking for trouble, yes the DC5 JRSC is a little better, and 3.3" is do-able, but that's it, until you get to cooled installs.
to put some numbers to this, at 10Psi, the air temp exiting the charger is way over 125C, do this on a trackday, and after ~10 mins, it will be over 150C, and even with the best fuel in the world, that's going to be detting hard.
if you want to get more out of your JRSC, look at the exhaust (all of it), that's where the gains are to be had, get it right, you will see lower boost pressures for the same pulleys, leading to lower temps and more power.
Boost is a bad thing, what you should be chasing is air mass, not boost.
