Right............ I know certain people like them and I know of others who can't see the point of them, but I thought I post a query....
Most People's advice is when fitting a optional BOV (Dump Valve or PSSSSSSHHHHHH thingy you here from some turbo cars as they speed off up the high street) that the recirculating dump valve that is already fitted as standard should be removed for better performance of the new one....
I've just fitted the Baileys BOV that I got from Fraz (Thanks Fraz) and what I've found is that the new BOV starts to dump gas at around 3500 to 4000 rpm even with the original one in place.
To my mind this shows up the following :
The point of the BOV is to function as a turbo protector to get rid of excess gas as and when required and generally lowers the stress on the turbo internals (bearing etc).... Having two Dump valves fitted means that the gas transfer efficiency has been raised and removing the original would place stress on the new one.. I am fully aware of the fact that possibly I won't be getting the full PSSSSSSSHHHHHHHH!!!!!!! sound that some people can get but, the sound produced is the end result of fitting one, which is not really the reason for their invention.....
The only other think I can thing of is possibly the orignal one is knackered....
Anyway I thought I'd give some of the tuning bods something to ponder on over coffee....
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