Gimme A Straight Answer! 4 Questions

[hulk xr6t]

Hi,

There are millions of topics on this but no straight answers...

Regarding stock BOV being

Atmo Vented VS Plumb back VS No BOV,

Other than obvious sound characteristics what is the effect on performance...

1. Which setup is the best for throttle response and why?

2. Which is the best for turbo spool up and why?

3. Which setup results in least lag and why?

4. Will No BOV damage the turbo

I have read so many topics and most of them contradict one another, they never give a straight definitive answer.

[exarsixturbo]

That's because everyone has a different opinion!

If everyone thought the same thing, there wouldn't be millions of threads.

Do you think this will be any different....?

I'll start...

1. Can't notice a difference

2. Can't notice a difference

3. Can't notice a difference

4. No idea. I would say yes, but I until I got my current setup, I didn't run one.

Where is XRTPSI - he loves these threads!! :spacecraft:

[bcl]

Stock or unmodified?

Standard or non-standard turbo?

How much boost do you run?

Auto or manual?

What application? Street/drag/race?

Stock or aftermarket BOV?

Do you want to keep it legal, or not a problem?

Are you influenced by the “listen to me” factor?

Do you really take notice of the response that most people give, most of which does not agree?

Give me a give a straight definitive answer.

You will never get a straight non-contradictory consensus on this.

Brian

[Dillz]

Yay another one :spacecraft:

I'm with Brian, there are so many factors that come into account there is no one definitive answer.

After a while you just give up and do what ever mod you want, in theory a bov should help keep the turbo spooled and come on boost quicker but as for fact I got NFI!. Trial and error it for yourself, best way to go.

And pleeeeease..... Don't start another bov thread.

[R-SPEC]

My car is a stock manual F6 and I've done all of these setups over the past few weeks, and I didn't notice any difference in performance at all.

I've had mine venting out of a breather filter for a few days now, and although the PSSHH sounds good on a video, it's farking annoying after a while.

So in my opinion, it's up to what you want your car to sound like, and how much attention you want. Just try them all and see what you think. My 2c :spacecraft:

Edited 17/04/08 11:34 PM by R-SPEC

[Fat-Tony]

Answers to 1, 2, and 3, there is no difference. 4. Who knows, plenty of people don't run them and have not had an issue.

[hulk xr6t]

The question says im not concerned about sound, that is personal preference.

But there must be some difference in the three scenarios regarding, spooling, throttle response and lag... there must be.. Please dont take the easy way out, offer a logical answer..

Im talking stock bov, auto, 14psi...

NO BOV: They must slow up the turbo more than having a BOV. There being more flutter confirms this. But wouldnt this only be true under a complete relaxing of throttle. But if you maintain throttle on gear change (reasonably quick change) with no bov, surely the exhaust gases at 3000rpm+ would still offer positive boost and negate any flutter. you have the bonus of a pressurised inlet charge already and keeping the pressure... there would be less performance lag on continuous open throttle? Arguable more lag on relaxed throttle and then re-applying throttle ie more re-spooling... Also is the flutter enough to cause damage to our big bad turbos??

PLUMB BACK: The plumb back throwing air before the turbo, does it disrupt natural airflow of the intake? or offer cooler (after intercooler air) aiding spool up and cooling air temperatures for more power... Is this offset by ther drop in pressure between turbo and inlet having to repressurise after the dump on continuous and relaxed throttle applications. Also do stock Bov's good enough to hold all boost ? at 14psi?

VENTED BOV: With a quick change and continous throttle, does the inlet pressure drop, the exhaust gasses would keep the turbo spooling as they are at 3000rpm+. The inlet charge of air is arguable warmer than that of the plumb back boost dump as its now vented to atmo (the cooler after intercooler air is lost). The stock Bov does not vent enough air, hence the flutter that continues (although less than no bov)

[Dillz]

Mate unless your going for a 10 sec pass why does it matter? If you use your car primarily for street use I'm sure .0000001 of a second less boost between gears isn't going to ruin your day.

And if it really concerns you that much tear the f*ckin thing off and supercharge it.

[PROXRT]

[hulk xr6t]

Mate unless your going for a 10 sec pass why does it matter? If you use your car primarily for street use I'm sure .0000001 of a second less boost between gears isn't going to ruin your day.

And if it really concerns you that much tear the f*ckin thing off and supercharge it.

So how do you know its .0000001 of a second less boost? You dont work for Turbosmart do you? They are always trying to say its a "performance" mod... Ill translate your argument to read... The difference does exist but according to your tests its negligible.