Originally Posted by
johngoulding
your turbo would find it hard to spool going up gears , ok for first and second but will toil to build boost 3rd upwards the dump valve essentially stops backpressure causing the turbo to STALL ! and hence taking longer to spool up which is lag as its known obviously
other than that removing it would only cause lag
without the dv you would get the same WHOOSH NOISE but it would be coming from the mouth of the turbo rather than the dv , that woosh noise without a dump valve which can be heard on fiesta rs turbos and escorts without dv's is basically the air travelling out backwards to the only point of pressure release ( the air filter track )
so basically it would be fine to remove it just as long as ur wiling to put up with the above until a better one is sourced
I know this is the standard respose to DV discussions but every turbo car i have tested with returns quite the opposite!
When you "Dump" the air from the pipework the turbo has to refill the boost hosing and get the pressure back up to the point before the gear change, this will obviously cause a bit of lag, With no DV the system doesn't de-pressurise and so during quick gear changes the lag is almost eliminated completely! The flip side is the bearings on the turbo take a hit from the pressure wave which is not dissipated due to having no DV.
We used to remove the DVs when running 1/4 miles at the pod to save vital 100ths !
Dave