dump valves and blow off valves

[japedup]

wats the difference between the 2 and which makes are the best,also which would you recomend :?

 

[caz]

Both the same mate

 

[T11EWL]

There are two types though -

Atmospheric dumpvalves or BOVs are the ones that make the whoosh noise - alegedly cause fuelling problems but no-one on here has had any problems

Re-circulating valves 'dump' the air back into the intake so the same amount of air the MAF detected coming into the intake is circulating round the system.

MAF - Mass Air Flow (sensor) - tells the ECU how much fuel to supply to the engine

 

[Keira]

Some clever f*ckers have made them that re-circulate at low pressure and dump to atmosphere at higher pressures.

So that would make 3 types