Here's the most ricer thing I'll ever post.
I think I kind of like the sound of compressor surge. Reminds me of that Prodrive P2 squirrel-mincer type sound. I imagine it's damaging to the stock turbo or engine though or else we wouldn't have them. Can the ball bearing turbos run without a BOV and not be damaged?

 

Just crush your stock metal DV if you still have one, and run an open air filter. I did it to mine and it sounds like ninja chimunks. Just don't run w/o a D/V, or BOV on a fast spooling manual-trannied car. It is doable on an automatic tranny but not with a manual box.

 

Running without a valve would cause too much boost at part throttle. This places a load on the turbine as well the IC efficiency will drop.

 

I'm not sure I follow the last posters logic at all. I don't see how the DV or BOV or BPV or whatever we would like to call it has any bearing on boost control. I also don't understand the load on the turbine or IC efficiency issue. You're going to have to explain those to me.

I'll give you the equation I got from Corky when he got bendy with me telling him mine was leaking and he told me just to remove my BPV.

Porsche estimates 1 mile at the 24 of LeMans is equal to 1000 miles in a street car. Let's go generous and make that 500 instead.

The cars running the 24 run for around 3400 miles, make 7-900 hp, change or add no oil, run insane boost, shift and accelerate an infinite number of times, and use no BPV at all. That's at half the Porsche estimate for abusive real world mileage and it hits the clock at 1.7 million miles.

They use over engineered engines, intakes, exhausts, chassis, but alot of the items on those motors are damn near off the shelf. Do you think that the possibly 200k street miles you run your car is even going to come close to the abuse a LeMans cars puts up with in a single day? I can assure you it will not.

BPV's are a relatively new invention in the turbo world. Examples of turbo cars as late as the 80's and 90's came from the factory without any BOV/BPV at all(GN is a good one). The original use of the BOV I know of was to offset the drying out of the bowl on carbureted blow through turbo cars in the early 70's. I am sure there are other earlier examples. The first BOV Corky had, he had to build himself because no one made one.

Can you run without one? Absolutely. Will it be noisy as hell when you drop the throttle? You betcha. Is it going to kill your turbo? Probably not. Will it increase the spool time between shifts? Probably since it will have slowed down alot more. Would I do it? No. But after having my hour long with Cork, I'm not opposed to it. On a drag only car with no lift shift, I'd do it.

/brox

 

I would not recommend this whatsoever.

 

Broxma i would not compare any street car to any car that runs 24 hours at le mans.

Honestly its there for a reason, i have seen real surge on boost destroy turbo's on the dyno! That minor chachacha you hear is not real surge, real compressor surge is very violent and loud.

 

What is actually being damaged? Does the turbine wheel contact the housing or is the bearing failing from the load on it?

So what's the sound heard in this clip?:
http://www.youtube.com/watch?v=vLmHTVf4py8

Surge, BOV, or Wastegate?

 

Sounds like a tial under 30+ PSI

When you run that much boost any BOV will sound like that.

 

ive seen my friend run his starion(2.6,I4,stock turbo/everything) with no bpv/bov... and his car ran just fine, sounded pretty cool too...

 

Compressor surge is nothing more than a turbo trying to make more boost than airflow will allow. So if a turbo destroys itself at boost due to "Surge" then it would be the first my boss, who hasn't just been around the block, he built the block, has ever heard of it. And the comparison between the 24 cars and a streetcar was made by Porsche engineers themselves. I had nothing to do with it except for posting it here.

There is nothing inherently dangerous about it. Turbocharged cars had been boosted for years before the DV was even invented. It certainly does make sense to run one. The turbo will not lose all of it's energy upon lifting the throttle so that's good. But for the manufacturers, the most important driving issue that brought on the widespread use of the DV was more likely that the average car buyer was afraid of the noise, and thought it was doing something damaging, and that idea still remains. Even in the motorsports world, the DV was not an invention of performance, but necessity.

Now for one of the "Let me tell you a story" tales I get a work.

Back in the day there was no such thing as boost control. Turbo's didn't have wastegates so we controlled boost by restricting the size of the exhaust after the turbo. Of course they had no knock detection either, so we'd get the setup running, hit the track and listen for the detonation. Then you go back into the shop and make a smaller restrictor to jam up the tailpipe to drop the boost to where the motor had knocked before. Tuning by trial and error.

There's old school and then there are the guys who were doing this stuff before the school even opened. Working for one of those guys puts all the stuff we do now into perspective.

/brox

 

Im sure internal components have change since the "Old School" days. I would think running no BOV/BPV would induce shaft play over time.