Some say an after marker BOV reduces lag?
What about WOT shifts though?hqen2000 said:If you don't have a BOV as godelfer said it will cause a surge in the system in which the turbo will "compressor surge" causing them to lose some of their spool, so when you shift it has to wind up a bit more than it would if the system is evacuated (blown off).
So basically, between shifts you'll be able to build a bit more boost (less lag) but other than that it's the same.
Espeefan said:But they do help reduce a little bit of lag between shifts. A venting BOV will allow the turbo to free wheel for that split second you close the throttle to change gears. Without a BOV, as the others said, the air charge stacks up and starts to put put resistance on the compressor wheel, slowing it down.
A BOV won't reduce lag in any other situation where you need to spool the turbo(s) out of a vacuum state, like cruising, and then getting on it.
In the case of a WOT shift, the BOV will do nothing, and you shouldn't have any lag, but I honestly don't see a WOT shift as being a good trade off to bouncing your engine off the rev limiter. You might loose a little boost, shifting WOT, but if you do it quick enough, I can't see the engine making any vacuum since momentum will keep the turbo(s) spinning and the throttle body will still be open.
That's the only reason I bought one.s14roller said:All you need to know is no one really talks about BOVs reducing lag...
10 BOVs haha... i think one will do... but i think id like to pick one by sound and as long as it releases pressure like it shoud. I mean i dont want to just pick one and then it will drive me nuts in about a week!!Jaxx said:Well its better to be safe than sorry with a bypass valve.... But please don't get it just because you like the sound....
And if it did reduce turbo lag, you would be seeing guys with T-88's running 10 BOV's :lol:
Go4shoped said:what i want to know is if i can get the same effect as a BOV without the sound. u know, so the mother doesnt find out about the turbo(she knows nothing about cars but she'll be asking what it is)
Loose boost between shifts? Uh oh, where'd my boost go?!? Really, those guys never let of the throttle with their sequential transmissions. They don't have too. Heck, most the time they use the brakes and throttle together.ScrewDrvr said:WRC cars run with no BOV. They do this to never loose boost between sfifts and on/off the gas.