What BOV is this?

[Oakville]

Ahh. That car ended up in my neck of the woods with the same owner, JNS stickers in tact on the rear windshield lol

[Velders]

Owen used to live up here in Ft. McMurray, pretty sure he was friends with NismoS-tune, and Wingnut.

Oh, and to be on topic, twins with off throttle compressor surge won't sound the same as a single.

[bellis_GTR]

Oh, and to be on topic, twins with off throttle compressor surge won't sound the same as a single.

Yeah I didnt think so

[CelicaKidd_205]

It might just be me, but the compressor surge sound is like nails on a chalkboard IMO. The induction system is not designed to have that kind of pressure build up in it, not to mention potential damage to the turbo as well as the significant increase in turbo lag between shifts without proper ventilation.

[Velders]

The induction system is not designed to have that kind of pressure build up in it, not to mention potential damage to the turbo as well as the significant increase in turbo lag between shifts without proper ventilation.

With that type of surge there isn't really much more pressure built up than the max boost you are running. With or without a BOV your going to have an initial pressure spike. With the BOV you have a spike, then the pressure bleeds off. Without it you have a spike, then a pressure wave that reflects back and forth between the throttle plates and the compressor wheel. Of course each time it reflects a little more pressure is lost, but if you shift quickly there will actually be less lag because you still have some positive pressure built up in the system.

[Velders]

Here are two graphs that show the difference between using a bov and not using one.

bov's leak, leaks mean less performance. New turbos are far superior in every way to old ones. The stance on compressor surge need to change imo.

If you shift fast you can take advantage of the decreased pressure drop with no bov.

I had a thread with some nice ideas/results pertaining to compressor surge.
some high-speed logging of the pressures that occur in the intake system between the turbo and the throttle blade when you snap the throttle shut. using a Fluke 123 digital Scope meter and a Fluke pressure transducer.
the data in the thread is old, i came across it a few years back. Turbos have come a long way, at this time they were using it to "boycott" those insisting on not using a bov, i took it in favor of not using one

http://www.trak-shuhn.com/forum/viewtopic.php?f=14&t=456

[support@feastauto]

Wouldnt even bother bringing a GT-R to Honjyo. Simply to short of a track.