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BOV or NO BOV

drewecrome

By drewecrome,
in Engines & Forced Induction

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|PRESA| Proficient

|PRESA|

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Posted

I have an after market plummed back BOV and to be quite honest i can't say i could feel a noticable different compared to the standard.

My next step will be to try out the atmospheric bov and see if theres any difference in that.

Can anyone give any ideas on what would be more efficient? atmos bov? plummed bov?

what about the flutters (commenly known by the sound the VL's let off) is that really as bad as everyone says? if it is.. then why do a number of fast 1/4 mile VLT's have it?

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Sydneykid Grand Master

Sydneykid

Posted
Posted

Well, the theory is by having a recirculating BOV, the hot air goes around again. Whereas an atmospherically vented BOV gets rid of the hot air and makes room for fresh (colder) air. There is also the cooling effect from the overly rich mixture that the engine runs after the atmosphere BOV has vented. Some people say that this overly rich mixture also reduces lag on gear changes as it burns in the turbo and helps spool it up.

You can overcome most of the stalling problems associated with an atmosphere BOV, it is a bit of fiddling though and I am not sure if it is worth it on a road car when you add in the legal issues. On the race cars we always have atmosphere vented BOV's.

Hope that helps :(

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