Ill be that idiot joe joe you know why, cuz im a honey badger i dont give a f$ck haha

 

This is the best explanation I've heard yet. I wasn't disagreeing with you but saying that the idea is dumb without a reason I think is either ignorance or arrogance and I don't care for either.

So would a NLTS setup reduce the need for a BOV?

 

I had actually never thought of running a turbo car without a BOV before and have learnt a lot since this thread started.

I see 3 types of people continuing this thread, those who want to learn, those who want to share their knowledge and those who have gotten into pissing matches.

 

Damnit, why you gotta ask questions like that to make me post and be that idiot

Technically yes for two reasons, but who NLTS 100% of the time?
1) the throttle never closes so that compressor drag is significantly reduced
2) the throttle never closes and you don't see the residual spool delay betweens shifts.

The second is actually a performance reason to have a bypass valve, to cut down on turbo lag between shifts.

So what did we learn today boys and girls?
Bypass valves are for two main reasons
1) Durability, keep your turbo alive
2) Performnace, reduce turbo lag between shifts
3) to make super cool noises

But every setup is different and may not need them so it may depend.

now... if you keep posting you'll be a super mega idiot

 

The question has been answered previously but I will add my .02. The BOV is a safety device to prevent turbo destruction as stated before. My other vehicle is a modded 12V Cummins that cranks near 40 psi. I can make the turbo bark pretty easily if I let off the throttle to quick. I assume having a throttle plate would be 10 times worse. A hard bark or continuous barking can snap a turbo shaft. If you want to know more.. go google turbo bark..

 

I can assure you I am not an idiot, let alone a.....super, mega? idiot? lolwut.

At what level of boost do you think a BOV becomes a necessity? Whenever someone with a NLTS setup is going WOT they are likely to be using their NLTS. During sedate driving they might not use it but the amount of boost (if boost is even generated) may not call for it. Nor will they be concerned about the resultant turbo lag.

 

this day and age with very quick responding turbos, running with no bov is a huge mistake. just normal daily driving for example with a fp black dbb and 2.3 you will compressor surge like hell without a bov.

once the throttle plate is closed the air has no where to go but the opposite way and bov protects the turbo.. remove the bov and you are just slowly kicking the turbos ***.. eventually it would get knocked out and then so will your wallet / bank / funds.

 

wouldnt the air be released through the anti surge ports??

I'm no noob or anything, but I've driven a few big power scoobs without BOVs, the air was re leaved through the turbos compressor anti surge ports

 

^all good information.
I'd like to add that the reason a BOV is used is because the resulting back pressure creates a huge thrust load that journal bearing turbos really don't like. BB turbos are able to handle this thrust load due to the different bearing design, From my understanding, the FP turbos that fail, usually end up wiping out the thrust bearing. This suggests to me that the thrust bearing in the stock center section is not the most robust. (Yes, I'm aware bigger wheels affect the durability of the bearings)
To me, the BOV is a necessity for turbo longevity. It's not going to cause a turbo to fail catastrophically, but it will fail prematurely.

 

That is actually a reasonable question, but remember the difference between pressure and airflow in general, I say this because a surge port is only so big, the overall area of the oulet of the compressor opposed to the accumalitive area of all the ports is no comparison.

That being said, anti-surge ports don't even work 100% of the time when you're at WOT let alone no throttle, they can only absorb a small percentage of surge depending.

 

i ran my car for 3 years without a BOV, this is a 4g93 with a stock td05 16g 10.5cm. sold the turbo and upgraded. turbo still going strong on a boosted honda without a bov to this day. actually come to think of it i have never met someone that suffered turbo failure due to not running a BOV. by the way you are talking you have met tons of ppl who lost a turbo exclusively due to not running a bov.

 

wow you ran a turbo for 3 years without blowing it. with that engine huh? how many pounds were you running by the way? You probably never blew it because you were never running a large amount of pressure. Excessive pressure going in a reverse direction due to lack of place to go, is what ultimately causes turbo failures. Pure and simple, I havent met tons of people who lost a turbo due to not running one. But then again ive never met an idiot who intentionally took one off to see what happened and run it consistently. Let me guess that honda owner, hes boosting no more then 10 psi or so. I just find it funny why you guys are trying to argue on something that came factory on our car. Why not put one of those tornadoes in your intake pipe. Why not run vta? Why not put neon lights on your cars? Theres a difference between function and fashion. Tell your boy to run 25-30 psi and get tuned on his honda. See what blows first the bottom end head gasket or turbo, with no bov like he has been. See how long it lasts. I didnt invent the theory of what happens to stuff when excessive pressure is involved. Its just common sense, stuff im noticing is happening a lot less on this forum.

 

Can you pass on some more info about these incidences? Engine, turbo, boost, the condition of the failure etc if you can.

It has been said multiple times that it is possible to run no BOV, many MR2 owners insist that it is beneficial to run without one on their 3SGTE. From a MR2 forum:

The reason I understand is that there is no pressure loss in the intake pipe when the throttle is closed and thus when the throttle reopens the air is pressurised read to go. (Info from another forum but I think was quoted here earlier).

I don't think it is fair to say the cause of his non-failure on his 4G93 TD05 (great engine BTW) is due to his boost level. When you increase the boost on a stock turbo, you are going to decrease it's longevity for sure (with or without BOV). Referring to a turbo running higher boost without a BOV, the turbine wheel is spinning faster, the pressure being sent to the throttle body is greater. Thus when the throttle is closed the turbine wheel will have to decelerate more and quicker than at stock boost.

So, of course, the more boost you run the greater the need for a BOV will be. But at stock boost levels for certain vehicles, it appears to not be a necessity. One of these vehicles being a 4G TD05 setup similar to an evo.

 

whoa there junior, alot of probablys and let me guesses in your posts. let me help u out.

i used to run 25 psi on my motor with the tdo5 and the honda owner runs 19 psi on his motor.

again i ask, how many turboes have you personally heard of being blown or damaged exclusively from not running a BOV on it. oh yes, u said i know at least 15 ppl who do not run bovs on the boosted cars they drive. some of these turbos are even chinachargers. and none of them experience or have ever experienced a turbo failure that could be sensibly traced back to not running a BOV.


if in fact running no bov destroys turbos it isnt a case of it happening in weeks or months or even a year (or a couple dozen WOT pulls as you think).

 

I havent seen any personally blow due to no blow off valve, because no one I know is that retarded to take it off, egr system yea i can see that removed. But why take the chance with no bov? I said previously the dozen or so wot pulls just as a roundabout #. Theres no magical # of 12 when thats as many wot pulls as it takes to blow the seals on the turbo. Im just sayin if you run enough boost without one, its gonna fail prematurely, maybe it wont. Maybe youll be lucky. But from a longevity standpoint, its always wise to use one.
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