Anyone here run without a BOV?

[WES_393]

Only problem I see with that theory, Wes, is that if the mas cannot measure the air going back out and write it off as unused, then what exactly happens if you are recirculating your bov back into the turbo's intake, and it discharges the unused air? Its being discharged at the inducer side of a compressor with no drive pressure, slowing it, and being released the opposite way through the maf. I could be wrong here, but it seems to be the same in my mind

A little air discharging backwards through the MAF wouldn't be so bad, I'm sure that's what happens anyways when we chop the recirc tube and vent high pressure. The problem is the air being blown out of the MAF, and then getting sucked back in and counted again. You have X amount of air in the intake system that has been counted and will be consumed by the engine, but that air keeps oscillating back and forth through the MAF sensor and basically simulating a larger mass of air moving through it. Like a kid waving his hand across the door sensor and the dry cleaners to make that "bing-bong" noise. It's counting the same thing over and over, but the store owner thinks he just got 20 customers all at once.

I'll have to dig up my old logs from when I had a too heavily crushed 1g BOV. I have logs that show the difference between when the BOV opened, and when it caused flutter. I could let off the gas, listen to the surge, and literally watch the graph stutter and flatline.

 

[Cdc1221]

Oh OK, see I wasn't calling you wrong, I just had that thought in my head. I obviously had no facts to back it up. I guess the effect of that would vary dependent on turbo size, boost pressure, and distance between the turbo inlet and the mas. I'm not advocating running without a bov, I just enjoy a debate

 

[LandSpeed-DSM]

This will be my only post in this thread.

Some background on me- I am currently going back to school for engineering. I try to read any engineering white paper I can get my hands on when it comes to centrifugal pump/impeller design. Some of you have read my analysis in the billet wheel thread (which have been shown to be accurate with datalogs from the various people using said wheels). I prefer facts and the scientific method to internet bullshit and "my friend did x".

I like that you insinuate that every other post in here is internet bullshit, and that you are the only one chiming in who has gone to school for engineering or has more than a brief familiarity with physics.

This could not have come off more pompous.

Congrats! You've read some white papers, I too am a big fan.. paying for access to SAE docs and spending a healthy portion of my free time perusing MIT's D-Space archives. I don't typically feel the need to announce that at the start of my comments however.

Perhaps you didn't intend for it to come off that way, or that it only tweaked me in particular to be dismissed out of hand as "internet bullshit."

Now with that said, I can appreciate that you took the time to share your logic behind the decision to not run a BOV. That many F1/WEC/LMP cars opted not to in the past as well is a good point. That they beat on their hardware more than the overwhelming majority of this community if not the entirety is another.

However, if a BOV or lack thereof, makes for a difference of only a second on an 8.5 mile course like Circuit de la Sarthe (yes I know that can make or break an LMP/GTE team) think of how marginal that effect would be for the average ~200whp turd here.

As most of those quotes were yours, you'll find they were addressed.

You are free to run without a diverter, there is no BOV Stazi that will seek you out for re-education. Meanwhile, there are plenty of benefits to running one nearly all of which were covered already. Appeals to over-complexity and the like are silly at this stage. As I mentioned up-thread.. OEM Engineers would not include them if this was such a sticking point.

Most applications that omit a BOV or equivalent are diesels.. which do not have a throttle plate. Why then do you suppose that these engineers and their 'quants would then still insist upon employing these valves in the vast majority of turbocharged spark-ignition platforms? Perhaps as is often the case there is no consensus on this item. Or that the benefit of not running one is outweighed by the several (however slight as you deem them) benefits offered by a BOV in the majority of application that they will still develop and include them?

Maybe, just maybe.. there is more than one way to skin this cat? For 99% of the population, maybe you should ask yourself what advantage there is to not running one, "complexity" aside.

 

[LandoAWD]

As a Sr Level "computer guy", I can unequivocally state that not all posts here are "internet bullshit".

It is, after all, my are of expertise and therefore you must heed my words.

I have spoken.

 

[Diamond Star Werks]

As a Sr Level "computer guy", I can unequivocally state that not all posts here are "internet bullshit".

It is, after all, my area of expertise and therefore you must heed my words.

I have spoken.

Fixed.

 

[LandoAWD]

One more "fixed" post and I'm asking for mod power back and then banning you.

 

[LandSpeed-DSM]

Fixed.

You missed the period coming after the closing quotation mark.

 

[Calan]

one more "fixed" post and i'm asking for mod power back and then banning you.

Lando = stealth mod

 

[c2ypt1c]

As a Sr Level "computer guy", I can unequivocally state that not all posts here are "internet bullshit".

It is, after all, my are of expertise and therefore you must heed my words.

I have spoken.

As a junior level "computer guy" myself, I can vouch for the the Sr level guys...true badasses in their own right.

/spock-mode on
However, I'm still confused as to what constitutes internet "shit" that is "bull..." Perhaps it is something as simple as a false statement?
/spock-mode off

 

[Diamond Star Werks]

You missed the period coming after the closing quotation mark.

There is a period after that actually.

 

[Diamond Star Werks]

One more "fixed" post and I'm asking for mod power back and then banning you.

Lol I kidd I kidd I joke.

 

[LandSpeed-DSM]

There is a period after that actually.

Right, and that's the issue

 

[Diamond Star Werks]

Right, and that's the issue

goes inside it doesn't it?