BOV Complete delete

The exciting kind that rally cars have that teenage boys wet dream about having on their corollas.

We run antilag yes but only on stages. On the road we don't. And still surges

Pulling this up from the dead but hey

I'm on the same page as gotasuby - I haven't run them on most of my road cars in years if I can help it and I'm yet to have a single turbo go, talking to enough people in bizness has got me settled it's a marketing ploy which has become gospel. There's absolutely a noise aspect to it - with a decent factory bov you can hide all turbo noise. Without one you have joe bloggs asking what all the chuffing sounds are about.

Put a boost gauge on the inlet, look at the levels actually generated pre throttle without a BOV - it's sweet ****all. You get an instantaneous spike of maybe 30-40% over wastegate pressure on lift off, after that the chuff-chuff sound is just holding atmo pressure when you're at 0 throttle and it should show vacuum. There's got to be a hell of a lot more stress pushing a turbo past maintaining 20psi at 7kRPM than there is from a little bitty bit of pressure against a closed throttle - end of the day it's a device designed to pressurise a closed volume, just happens to be that the running engine means it never fills it

And don't get me started on how much I love the sound of hearing all the chuff-chuff-zututututu noises when you're on and off the pedal through a twisty bit, far better than some tweetybird-being-raped chirp valve or what have you

Many 80's turbo cars ran no recirc valve from factory, St165 GTFOUR, Mitsubishi cordia, starion, sigma GSR off the top of my head, for 3 years i ran no BOV on my legacy with TD05. The thing is, the compressor is spinning when the throttle closes, but the exhaust flow is also stopped at the same time, so all that's left is the inertia of the wheel assembly. Recirc helps maintain and thus recover compressor speed when the throttle reopens, that's why all OEM cars have it from the 90's on

st185 had no recirc valve either