Atmospheric/blow off valve questions

[ItsNotMitch]

Firstly let me start with this. I've been searching for hours and either I have downs or can't find a fix for my issue. I have a sr20det black top s13 I'm currently NOT running any type of bov and I'm a little confused as to what to do with the vacuum nipple coming off the throttle body. Do I cap off the top right nipple off of the throttle body or do I run a line somewhere. Thanks in advance and sorry again if this is already a post.

[AnonymousBlackX]

Throw a bov on there before you start bitching about a blown turbo.

[ItsNotMitch]

Lol this is true. Don't have the money right now to get the T flange and have it welded. Not sure if it matters but I'm only running the stock 7 pounds.

[SoundEfx]

Any air reaching the turbo will cause problems unless it has built in protective measures (I can't remember the actual name of it)

Regardless, a bov should have been part of the build budget.

[Jorgs_7]

I would assume your turbo isn't expensive, judging by the budget to not install a BOV.

Cap the nipple.

Good luck.

[RB25GUY]

this is such a myth ive known people who havent used bov and are well over 400 hp alot of older turbo cars didnt have bov's the all trac celicas dont use bovs if you are running under 20 psi bovs arent really needed and "compressor surge" is on wot not when you are letting off the gas.... for anyone who thinks the flutter is catastrophic...... its not unless its near or over 20 psi then its recommended......

[Rustys14]

this is such a myth ive known people who havent used bov and are well over 400 hp alot of older turbo cars didnt have bov's the all trac celicas dont use bovs if you are running under 20 psi bovs arent really needed and "compressor surge" is on wot not when you are letting off the gas.... for anyone who thinks the flutter is catastrophic...... its not unless its near or over 20 psi then its recommended......

Agreed, they aren't as important as people make them out to be, hell Nissan didn't bother to put one on the CA18 powered Silvia/180s and most of those turbos are still kicking today. I actually stopped running a BOV on my sr20 because I've found it helps a bit with response on track. I run a PE1420 on my car which is a rather expensive turbocharger and I have no worries about premature failure due to not having a valve. Will not running a BOV reduce the lifespan of your turbo, yes but in most cases its by a negligible amount.

You should avoid statements about what psi things start to go at though since the speed of the compressor wheel are very different between turbos. A T25 is going to be spinning much faster then say a large T4 at the same psi.

[Kingtal0n]

Its not good for the turbo's bearing to get slammed around by forces transmitting through the compressor wheel to the shaft. You want a smooth consistent rate of change, a nice gradual slope building speed and decelerating for maximum bearing life. Some conditions of surge also erode the compressor wheel, flexing the tips of the aluminum blades, causing damage.

Use a high quality air filter. My favorite idea is the paper element in a custom box. We were talking about compressor wheel condition and I thought I would throw this in.

[Boostd2]

Most people telling you Bov's are a MUST do it because of what others have told them, and don't test it for themselves.
Removing the bov has had great positive improvement on all the cars i've tried it on. I've actually run no bov on my car with stock ceramic wheel turbo for 7 years without issue.
Greatly improved performance between shifts among other noticeable differences. But you can't do it with stock ecu maf equipped cars, that's all.

Turbo technology had come a long way. I encourage anybody who hasn't tried running no bov to do it for a day and see for yourself. Otherwise don't tell people what not to with their cars if you don't have any experience yourself.

Back on topic: I capped off the vacuum hoses.

[KAT-PWR]

Most people telling you Bov's are a MUST do it because of what others have told them, and don't test it for themselves.
Removing the bov has had great positive improvement on all the cars i've tried it on. I've actually run no bov on my car with stock ceramic wheel turbo for 7 years without issue.
Greatly improved performance between shifts among other noticeable differences. But you can't do it with stock ecu maf equipped cars, that's all.

Turbo technology had come a long way. I encourage anybody who hasn't tried running no bov to do it for a day and see for yourself. Otherwise don't tell people what not to with their cars if you don't have any experience yourself.

Back on topic: I capped off the vacuum hoses.
Are you dense? There is a reason turbo manufacturers like Garrett advise the use of BOVs, and all factory equipped turbo cars have bypass valves. Everything Kingtalon said in his post was correct. There is a difference between you, a fool with a boosted car, and the mechanical engineer who did the modelling (LOOKING AT EMPIRICAL DATA) and said that the system needs pressure relief.
How about you stop telling people to do things to their cars that defy logical thinking just because you tried it and it worked.
Also please elaborate on the other benefits.

[pacotaco345]

Compressor surge sounds cool, cap the nipple and have all the cool sounds.

[OBEEWON]

No BOV is best.

Run the line to your washer nozzles.
Turbosize your winshield sprayers.

[RB25GUY]

Compressor surge sounds cool, cap the nipple and have all the cool sounds.

this is compressor surge that kills turbos

nCj6Spwl1CU


"flutterdump" i havent seen any hardcore studies that it kills turbos other then turbo rocket scientist making video explanations without any proof.....

[feito]

Also please elaborate on the other benefits.
^what he said

[Corbic]

Throw a bov on there before you start bitching about a blown turbo.

Bwa ha ha ha ha.

5 years no BOV. No issue in my T25 and no issue on my 60-trim.

[Kingtal0n]

Bwa ha ha ha ha.

5 years no BOV. No issue in my T25 and no issue on my 60-trim.

I have an engine in my car that I put 37 miles on in the last 10 years with no blow off valve also. I guess I win because it still works after 10 years?

[Corbic]

I have an engine in my car that I put 37 miles on in the last 10 years with no blow off valve also. I guess I win because it still works after 10 years?

Oh so clever!

Went and checked just for you!

T60 has 26k kilometers on it.

It's a cute theory. Sure I may not get 200k miles out of my turbo, it beats the hell out of having to deal with BOV issues.